diff --git a/embassy-cortex-m/src/peripheral.rs b/embassy-cortex-m/src/peripheral.rs
index 6a03bfb9..c5fa20e7 100644
--- a/embassy-cortex-m/src/peripheral.rs
+++ b/embassy-cortex-m/src/peripheral.rs
@@ -1,9 +1,9 @@
 //! Peripheral interrupt handling specific to cortex-m devices.
-use core::marker::PhantomData;
 use core::mem::MaybeUninit;
 
 use cortex_m::peripheral::scb::VectActive;
 use cortex_m::peripheral::{NVIC, SCB};
+use embassy_hal_common::{unborrow, Unborrow, Unborrowed};
 
 use crate::interrupt::{Interrupt, InterruptExt, Priority};
 
@@ -33,8 +33,7 @@ impl<S> StateStorage<S> {
 /// a safe way.
 pub struct PeripheralMutex<'a, S: PeripheralState> {
     state: *mut S,
-    _phantom: PhantomData<&'a mut S>,
-    irq: S::Interrupt,
+    irq: Unborrowed<'a, S::Interrupt>,
 }
 
 /// Whether `irq` can be preempted by the current interrupt.
@@ -62,8 +61,14 @@ impl<'a, S: PeripheralState> PeripheralMutex<'a, S> {
     /// Create a new `PeripheralMutex` wrapping `irq`, with `init` initializing the initial state.
     ///
     /// Registers `on_interrupt` as the `irq`'s handler, and enables it.
-    pub fn new(irq: S::Interrupt, storage: &'a mut StateStorage<S>, init: impl FnOnce() -> S) -> Self {
-        if can_be_preempted(&irq) {
+    pub fn new(
+        irq: impl Unborrow<Target = S::Interrupt> + 'a,
+        storage: &'a mut StateStorage<S>,
+        init: impl FnOnce() -> S,
+    ) -> Self {
+        unborrow!(irq);
+
+        if can_be_preempted(&*irq) {
             panic!(
                 "`PeripheralMutex` cannot be created in an interrupt with higher priority than the interrupt it wraps"
             );
@@ -88,11 +93,7 @@ impl<'a, S: PeripheralState> PeripheralMutex<'a, S> {
         irq.set_handler_context(state_ptr as *mut ());
         irq.enable();
 
-        Self {
-            irq,
-            state: state_ptr,
-            _phantom: PhantomData,
-        }
+        Self { irq, state: state_ptr }
     }
 
     /// Access the peripheral state ensuring interrupts are disabled so that the state can be
diff --git a/embassy-hal-common/src/unborrow.rs b/embassy-hal-common/src/unborrow.rs
index 7ed823c5..06e8d0c8 100644
--- a/embassy-hal-common/src/unborrow.rs
+++ b/embassy-hal-common/src/unborrow.rs
@@ -16,6 +16,16 @@ impl<'a, T> Unborrowed<'a, T> {
         }
     }
 
+    pub fn map_into<U>(self) -> Unborrowed<'a, U>
+    where
+        T: Into<U>,
+    {
+        Unborrowed {
+            inner: self.inner.into(),
+            _lifetime: PhantomData,
+        }
+    }
+
     pub unsafe fn into_inner(self) -> T {
         self.inner
     }
diff --git a/embassy-lora/src/stm32wl/mod.rs b/embassy-lora/src/stm32wl/mod.rs
index d7d39969..49991db1 100644
--- a/embassy-lora/src/stm32wl/mod.rs
+++ b/embassy-lora/src/stm32wl/mod.rs
@@ -3,7 +3,7 @@ use core::future::Future;
 use core::mem::MaybeUninit;
 
 use embassy::channel::signal::Signal;
-use embassy_hal_common::unborrow;
+use embassy_hal_common::{unborrow, Unborrowed};
 use embassy_stm32::dma::NoDma;
 use embassy_stm32::gpio::{AnyPin, Output};
 use embassy_stm32::interrupt::{InterruptExt, SUBGHZ_RADIO};
@@ -30,35 +30,35 @@ pub struct RadioError;
 
 static IRQ: Signal<(Status, u16)> = Signal::new();
 
-struct StateInner<'a> {
-    radio: SubGhz<'a, NoDma, NoDma>,
-    switch: RadioSwitch<'a>,
+struct StateInner<'d> {
+    radio: SubGhz<'d, NoDma, NoDma>,
+    switch: RadioSwitch<'d>,
 }
 
 /// External state storage for the radio state
 pub struct SubGhzState<'a>(MaybeUninit<StateInner<'a>>);
-impl<'a> SubGhzState<'a> {
+impl<'d> SubGhzState<'d> {
     pub const fn new() -> Self {
         Self(MaybeUninit::uninit())
     }
 }
 
 /// The radio peripheral keeping the radio state and owning the radio IRQ.
-pub struct SubGhzRadio<'a> {
-    state: *mut StateInner<'a>,
-    _irq: SUBGHZ_RADIO,
+pub struct SubGhzRadio<'d> {
+    state: *mut StateInner<'d>,
+    _irq: Unborrowed<'d, SUBGHZ_RADIO>,
 }
 
-impl<'a> SubGhzRadio<'a> {
+impl<'d> SubGhzRadio<'d> {
     /// Create a new instance of a SubGhz radio for LoRaWAN.
     ///
     /// # Safety
     /// Do not leak self or futures
     pub unsafe fn new(
-        state: &'a mut SubGhzState<'a>,
-        radio: SubGhz<'a, NoDma, NoDma>,
-        switch: RadioSwitch<'a>,
-        irq: impl Unborrow<Target = SUBGHZ_RADIO>,
+        state: &'d mut SubGhzState<'d>,
+        radio: SubGhz<'d, NoDma, NoDma>,
+        switch: RadioSwitch<'d>,
+        irq: impl Unborrow<Target = SUBGHZ_RADIO> + 'd,
     ) -> Self {
         unborrow!(irq);
 
@@ -73,7 +73,7 @@ impl<'a> SubGhzRadio<'a> {
             // This is safe because we only get interrupts when configured for, so
             // the radio will be awaiting on the signal at this point. If not, the ISR will
             // anyway only adjust the state in the IRQ signal state.
-            let state = &mut *(p as *mut StateInner<'a>);
+            let state = &mut *(p as *mut StateInner<'d>);
             state.on_interrupt();
         });
         irq.set_handler_context(state_ptr as *mut ());
@@ -86,7 +86,7 @@ impl<'a> SubGhzRadio<'a> {
     }
 }
 
-impl<'a> StateInner<'a> {
+impl<'d> StateInner<'d> {
     /// Configure radio settings in preparation for TX or RX
     pub(crate) fn configure(&mut self) -> Result<(), RadioError> {
         trace!("Configuring STM32WL SUBGHZ radio");
@@ -272,13 +272,13 @@ impl PhyRxTx for SubGhzRadio<'static> {
     }
 }
 
-impl<'a> From<embassy_stm32::spi::Error> for RadioError {
+impl From<embassy_stm32::spi::Error> for RadioError {
     fn from(_: embassy_stm32::spi::Error) -> Self {
         RadioError
     }
 }
 
-impl<'a> Timings for SubGhzRadio<'a> {
+impl<'d> Timings for SubGhzRadio<'d> {
     fn get_rx_window_offset_ms(&self) -> i32 {
         -200
     }
@@ -288,14 +288,14 @@ impl<'a> Timings for SubGhzRadio<'a> {
 }
 
 /// Represents the radio switch found on STM32WL based boards, used to control the radio for transmission or reception.
-pub struct RadioSwitch<'a> {
-    ctrl1: Output<'a, AnyPin>,
-    ctrl2: Output<'a, AnyPin>,
-    ctrl3: Output<'a, AnyPin>,
+pub struct RadioSwitch<'d> {
+    ctrl1: Output<'d, AnyPin>,
+    ctrl2: Output<'d, AnyPin>,
+    ctrl3: Output<'d, AnyPin>,
 }
 
-impl<'a> RadioSwitch<'a> {
-    pub fn new(ctrl1: Output<'a, AnyPin>, ctrl2: Output<'a, AnyPin>, ctrl3: Output<'a, AnyPin>) -> Self {
+impl<'d> RadioSwitch<'d> {
+    pub fn new(ctrl1: Output<'d, AnyPin>, ctrl2: Output<'d, AnyPin>, ctrl3: Output<'d, AnyPin>) -> Self {
         Self { ctrl1, ctrl2, ctrl3 }
     }
 
diff --git a/embassy-nrf/src/lib.rs b/embassy-nrf/src/lib.rs
index 3699ad0f..b6a21caa 100644
--- a/embassy-nrf/src/lib.rs
+++ b/embassy-nrf/src/lib.rs
@@ -135,7 +135,7 @@ pub use chip::pac;
 pub(crate) use chip::pac;
 pub use chip::{peripherals, Peripherals};
 pub use embassy_cortex_m::executor;
-pub use embassy_hal_common::{unborrow, Unborrow};
+pub use embassy_hal_common::{unborrow, Unborrow, Unborrowed};
 pub use embassy_macros::cortex_m_interrupt as interrupt;
 
 pub mod config {
diff --git a/embassy-rp/src/lib.rs b/embassy-rp/src/lib.rs
index 7da0d30c..e36761ac 100644
--- a/embassy-rp/src/lib.rs
+++ b/embassy-rp/src/lib.rs
@@ -17,7 +17,7 @@ mod reset;
 // Reexports
 
 pub use embassy_cortex_m::executor;
-pub use embassy_hal_common::{unborrow, Unborrow};
+pub use embassy_hal_common::{unborrow, Unborrow, Unborrowed};
 pub use embassy_macros::cortex_m_interrupt as interrupt;
 #[cfg(feature = "unstable-pac")]
 pub use rp2040_pac2 as pac;
diff --git a/embassy-stm32/src/can/bxcan.rs b/embassy-stm32/src/can/bxcan.rs
index b54fd3ff..6c0de2de 100644
--- a/embassy-stm32/src/can/bxcan.rs
+++ b/embassy-stm32/src/can/bxcan.rs
@@ -1,19 +1,17 @@
-use core::marker::PhantomData;
 use core::ops::{Deref, DerefMut};
 
 pub use bxcan;
-use embassy_hal_common::unborrow;
+use embassy_hal_common::{unborrow, Unborrowed};
 
 use crate::gpio::sealed::AFType;
 use crate::rcc::RccPeripheral;
 use crate::{peripherals, Unborrow};
 
-pub struct Can<'d, T: Instance + bxcan::Instance> {
-    phantom: PhantomData<&'d mut T>,
-    can: bxcan::Can<T>,
+pub struct Can<'d, T: Instance> {
+    can: bxcan::Can<BxcanInstance<'d, T>>,
 }
 
-impl<'d, T: Instance + bxcan::Instance> Can<'d, T> {
+impl<'d, T: Instance> Can<'d, T> {
     pub fn new(
         peri: impl Unborrow<Target = T> + 'd,
         rx: impl Unborrow<Target = impl RxPin<T>> + 'd,
@@ -30,32 +28,29 @@ impl<'d, T: Instance + bxcan::Instance> Can<'d, T> {
         T::reset();
 
         Self {
-            phantom: PhantomData,
-            can: bxcan::Can::builder(peri).enable(),
+            can: bxcan::Can::builder(BxcanInstance(peri)).enable(),
         }
     }
 }
 
-impl<'d, T: Instance + bxcan::Instance> Drop for Can<'d, T> {
+impl<'d, T: Instance> Drop for Can<'d, T> {
     fn drop(&mut self) {
         // Cannot call `free()` because it moves the instance.
         // Manually reset the peripheral.
-        unsafe {
-            T::regs().mcr().write(|w| w.set_reset(true));
-        }
+        unsafe { T::regs().mcr().write(|w| w.set_reset(true)) }
         T::disable();
     }
 }
 
-impl<'d, T: Instance + bxcan::Instance> Deref for Can<'d, T> {
-    type Target = bxcan::Can<T>;
+impl<'d, T: Instance> Deref for Can<'d, T> {
+    type Target = bxcan::Can<BxcanInstance<'d, T>>;
 
     fn deref(&self) -> &Self::Target {
         &self.can
     }
 }
 
-impl<'d, T: Instance + bxcan::Instance> DerefMut for Can<'d, T> {
+impl<'d, T: Instance> DerefMut for Can<'d, T> {
     fn deref_mut(&mut self) -> &mut Self::Target {
         &mut self.can
     }
@@ -63,15 +58,25 @@ impl<'d, T: Instance + bxcan::Instance> DerefMut for Can<'d, T> {
 
 pub(crate) mod sealed {
     pub trait Instance {
+        const REGISTERS: *mut bxcan::RegisterBlock;
+
         fn regs() -> &'static crate::pac::can::Can;
     }
 }
 
 pub trait Instance: sealed::Instance + RccPeripheral {}
 
+pub struct BxcanInstance<'a, T>(Unborrowed<'a, T>);
+
+unsafe impl<'d, T: Instance> bxcan::Instance for BxcanInstance<'d, T> {
+    const REGISTERS: *mut bxcan::RegisterBlock = T::REGISTERS;
+}
+
 foreach_peripheral!(
     (can, $inst:ident) => {
         impl sealed::Instance for peripherals::$inst {
+            const REGISTERS: *mut bxcan::RegisterBlock = crate::pac::$inst.0 as *mut _;
+
             fn regs() -> &'static crate::pac::can::Can {
                 &crate::pac::$inst
             }
@@ -79,15 +84,12 @@ foreach_peripheral!(
 
         impl Instance for peripherals::$inst {}
 
-        unsafe impl bxcan::Instance for peripherals::$inst {
-            const REGISTERS: *mut bxcan::RegisterBlock = crate::pac::$inst.0 as *mut _;
-        }
     };
 );
 
 foreach_peripheral!(
     (can, CAN) => {
-        unsafe impl bxcan::FilterOwner for peripherals::CAN {
+        unsafe impl<'d> bxcan::FilterOwner for BxcanInstance<'d, peripherals::CAN> {
             const NUM_FILTER_BANKS: u8 = 14;
         }
     };
@@ -102,19 +104,19 @@ foreach_peripheral!(
             ))] {
                 // Most L4 devices and some F7 devices use the name "CAN1"
                 // even if there is no "CAN2" peripheral.
-                unsafe impl bxcan::FilterOwner for peripherals::CAN1 {
+                unsafe impl<'d> bxcan::FilterOwner for BxcanInstance<'d, peripherals::CAN1> {
                     const NUM_FILTER_BANKS: u8 = 14;
                 }
             } else {
-                unsafe impl bxcan::FilterOwner for peripherals::CAN1 {
+                unsafe impl<'d> bxcan::FilterOwner for BxcanInstance<'d, peripherals::CAN1> {
                     const NUM_FILTER_BANKS: u8 = 28;
                 }
-                unsafe impl bxcan::MasterInstance for peripherals::CAN1 {}
+                unsafe impl<'d> bxcan::MasterInstance for BxcanInstance<'d, peripherals::CAN1> {}
             }
         }
     };
     (can, CAN3) => {
-        unsafe impl bxcan::FilterOwner for peripherals::CAN3 {
+        unsafe impl<'d> bxcan::FilterOwner for BxcanInstance<'d, peripherals::CAN3> {
             const NUM_FILTER_BANKS: u8 = 14;
         }
     };
diff --git a/embassy-stm32/src/crc/v1.rs b/embassy-stm32/src/crc/v1.rs
index 87133714..85abf22d 100644
--- a/embassy-stm32/src/crc/v1.rs
+++ b/embassy-stm32/src/crc/v1.rs
@@ -1,6 +1,4 @@
-use core::marker::PhantomData;
-
-use embassy_hal_common::unborrow;
+use embassy_hal_common::{unborrow, Unborrowed};
 
 use crate::pac::CRC as PAC_CRC;
 use crate::peripherals::CRC;
@@ -8,24 +6,21 @@ use crate::rcc::sealed::RccPeripheral;
 use crate::Unborrow;
 
 pub struct Crc<'d> {
-    _peripheral: CRC,
-    _phantom: PhantomData<&'d mut CRC>,
+    _peri: Unborrowed<'d, CRC>,
 }
 
 impl<'d> Crc<'d> {
     /// Instantiates the CRC32 peripheral and initializes it to default values.
     pub fn new(peripheral: impl Unborrow<Target = CRC> + 'd) -> Self {
+        unborrow!(peripheral);
+
         // Note: enable and reset come from RccPeripheral.
         // enable CRC clock in RCC.
         CRC::enable();
         // Reset CRC to default values.
         CRC::reset();
         // Unborrow the peripheral
-        unborrow!(peripheral);
-        let mut instance = Self {
-            _peripheral: peripheral,
-            _phantom: PhantomData,
-        };
+        let mut instance = Self { _peri: peripheral };
         instance.reset();
         instance
     }
diff --git a/embassy-stm32/src/crc/v2v3.rs b/embassy-stm32/src/crc/v2v3.rs
index 63f24e4e..06da29c1 100644
--- a/embassy-stm32/src/crc/v2v3.rs
+++ b/embassy-stm32/src/crc/v2v3.rs
@@ -1,6 +1,4 @@
-use core::marker::PhantomData;
-
-use embassy_hal_common::unborrow;
+use embassy_hal_common::{unborrow, Unborrowed};
 
 use crate::pac::crc::vals;
 use crate::pac::CRC as PAC_CRC;
@@ -9,8 +7,7 @@ use crate::rcc::sealed::RccPeripheral;
 use crate::Unborrow;
 
 pub struct Crc<'d> {
-    _peripheral: CRC,
-    _phantom: PhantomData<&'d mut CRC>,
+    _peripheral: Unborrowed<'d, CRC>,
     _config: Config,
 }
 
@@ -79,7 +76,6 @@ impl<'d> Crc<'d> {
         unborrow!(peripheral);
         let mut instance = Self {
             _peripheral: peripheral,
-            _phantom: PhantomData,
             _config: config,
         };
         CRC::reset();
diff --git a/embassy-stm32/src/dac/v2.rs b/embassy-stm32/src/dac/v2.rs
index ba7856a5..798eefbf 100644
--- a/embassy-stm32/src/dac/v2.rs
+++ b/embassy-stm32/src/dac/v2.rs
@@ -1,6 +1,4 @@
-use core::marker::PhantomData;
-
-use embassy_hal_common::unborrow;
+use embassy_hal_common::{unborrow, Unborrowed};
 
 use crate::dac::{DacPin, Instance};
 use crate::pac::dac;
@@ -90,7 +88,7 @@ pub enum Value {
 
 pub struct Dac<'d, T: Instance> {
     channels: u8,
-    phantom: PhantomData<&'d mut T>,
+    _peri: Unborrowed<'d, T>,
 }
 
 macro_rules! enable {
@@ -116,7 +114,7 @@ impl<'d, T: Instance> Dac<'d, T> {
         Self::new_inner(peri, 2)
     }
 
-    fn new_inner(_peri: T, channels: u8) -> Self {
+    fn new_inner(peri: Unborrowed<'d, T>, channels: u8) -> Self {
         unsafe {
             // Sadly we cannot use `RccPeripheral::enable` since devices are quite inconsistent DAC clock
             // configuration.
@@ -144,10 +142,7 @@ impl<'d, T: Instance> Dac<'d, T> {
             }
         }
 
-        Self {
-            channels,
-            phantom: PhantomData,
-        }
+        Self { channels, _peri: peri }
     }
 
     /// Check the channel is configured
diff --git a/embassy-stm32/src/dcmi.rs b/embassy-stm32/src/dcmi.rs
index f4ca93a7..bcf72349 100644
--- a/embassy-stm32/src/dcmi.rs
+++ b/embassy-stm32/src/dcmi.rs
@@ -1,8 +1,7 @@
-use core::marker::PhantomData;
 use core::task::Poll;
 
 use embassy::waitqueue::AtomicWaker;
-use embassy_hal_common::unborrow;
+use embassy_hal_common::{unborrow, Unborrowed};
 use futures::future::poll_fn;
 
 use crate::gpio::sealed::AFType;
@@ -82,9 +81,8 @@ macro_rules! config_pins {
 }
 
 pub struct Dcmi<'d, T: Instance, Dma: FrameDma<T>> {
-    inner: T,
-    dma: Dma,
-    phantom: PhantomData<&'d mut T>,
+    inner: Unborrowed<'d, T>,
+    dma: Unborrowed<'d, Dma>,
 }
 
 impl<'d, T, Dma> Dcmi<'d, T, Dma>
@@ -301,9 +299,9 @@ where
     }
 
     fn new_inner(
-        peri: T,
-        dma: Dma,
-        irq: T::Interrupt,
+        peri: Unborrowed<'d, T>,
+        dma: Unborrowed<'d, Dma>,
+        irq: Unborrowed<'d, T::Interrupt>,
         config: Config,
         use_embedded_synchronization: bool,
         edm: u8,
@@ -327,11 +325,7 @@ where
         irq.unpend();
         irq.enable();
 
-        Self {
-            inner: peri,
-            dma,
-            phantom: PhantomData,
-        }
+        Self { inner: peri, dma }
     }
 
     unsafe fn on_interrupt(_: *mut ()) {
diff --git a/embassy-stm32/src/dma/mod.rs b/embassy-stm32/src/dma/mod.rs
index 02d6ca0f..fe2bf900 100644
--- a/embassy-stm32/src/dma/mod.rs
+++ b/embassy-stm32/src/dma/mod.rs
@@ -8,7 +8,6 @@ mod dmamux;
 mod gpdma;
 
 use core::future::Future;
-use core::marker::PhantomData;
 use core::mem;
 use core::pin::Pin;
 use core::task::{Context, Poll, Waker};
@@ -207,6 +206,8 @@ impl Default for TransferOptions {
 }
 
 mod transfers {
+    use embassy_hal_common::Unborrowed;
+
     use super::*;
 
     #[allow(unused)]
@@ -255,17 +256,13 @@ mod transfers {
     }
 
     pub(crate) struct Transfer<'a, C: Channel> {
-        channel: C,
-        _phantom: PhantomData<&'a mut C>,
+        channel: Unborrowed<'a, C>,
     }
 
     impl<'a, C: Channel> Transfer<'a, C> {
         pub(crate) fn new(channel: impl Unborrow<Target = C> + 'a) -> Self {
             unborrow!(channel);
-            Self {
-                channel,
-                _phantom: PhantomData,
-            }
+            Self { channel }
         }
     }
 
diff --git a/embassy-stm32/src/eth/v1/mod.rs b/embassy-stm32/src/eth/v1/mod.rs
index 7985acc5..f2cdd909 100644
--- a/embassy-stm32/src/eth/v1/mod.rs
+++ b/embassy-stm32/src/eth/v1/mod.rs
@@ -6,7 +6,7 @@ use core::task::Waker;
 
 use embassy::waitqueue::AtomicWaker;
 use embassy_cortex_m::peripheral::{PeripheralMutex, PeripheralState, StateStorage};
-use embassy_hal_common::unborrow;
+use embassy_hal_common::{unborrow, Unborrowed};
 use embassy_net::{Device, DeviceCapabilities, LinkState, PacketBuf, MTU};
 
 use crate::gpio::sealed::{AFType, Pin as __GpioPin};
@@ -36,7 +36,7 @@ impl<'d, T: Instance, const TX: usize, const RX: usize> State<'d, T, TX, RX> {
 
 pub struct Ethernet<'d, T: Instance, P: PHY, const TX: usize, const RX: usize> {
     state: PeripheralMutex<'d, Inner<'d, T, TX, RX>>,
-    pins: [AnyPin; 9],
+    pins: [Unborrowed<'d, AnyPin>; 9],
     _phy: P,
     clock_range: Cr,
     phy_addr: u8,
@@ -207,15 +207,15 @@ impl<'d, T: Instance, P: PHY, const TX: usize, const RX: usize> Ethernet<'d, T,
         };
 
         let pins = [
-            ref_clk.degrade(),
-            mdio.degrade(),
-            mdc.degrade(),
-            crs.degrade(),
-            rx_d0.degrade(),
-            rx_d1.degrade(),
-            tx_d0.degrade(),
-            tx_d1.degrade(),
-            tx_en.degrade(),
+            ref_clk.map_into(),
+            mdio.map_into(),
+            mdc.map_into(),
+            crs.map_into(),
+            rx_d0.map_into(),
+            rx_d1.map_into(),
+            tx_d0.map_into(),
+            tx_d1.map_into(),
+            tx_en.map_into(),
         ];
 
         let mut this = Self {
diff --git a/embassy-stm32/src/eth/v2/mod.rs b/embassy-stm32/src/eth/v2/mod.rs
index 2b1caf99..c67a0307 100644
--- a/embassy-stm32/src/eth/v2/mod.rs
+++ b/embassy-stm32/src/eth/v2/mod.rs
@@ -4,7 +4,7 @@ use core::task::Waker;
 
 use embassy::waitqueue::AtomicWaker;
 use embassy_cortex_m::peripheral::{PeripheralMutex, PeripheralState, StateStorage};
-use embassy_hal_common::unborrow;
+use embassy_hal_common::{unborrow, Unborrowed};
 use embassy_net::{Device, DeviceCapabilities, LinkState, PacketBuf, MTU};
 
 use crate::gpio::sealed::{AFType, Pin as _};
@@ -25,7 +25,7 @@ impl<'d, T: Instance, const TX: usize, const RX: usize> State<'d, T, TX, RX> {
 }
 pub struct Ethernet<'d, T: Instance, P: PHY, const TX: usize, const RX: usize> {
     state: PeripheralMutex<'d, Inner<'d, T, TX, RX>>,
-    pins: [AnyPin; 9],
+    pins: [Unborrowed<'d, AnyPin>; 9],
     _phy: P,
     clock_range: u8,
     phy_addr: u8,
@@ -143,15 +143,15 @@ impl<'d, T: Instance, P: PHY, const TX: usize, const RX: usize> Ethernet<'d, T,
         };
 
         let pins = [
-            ref_clk.degrade(),
-            mdio.degrade(),
-            mdc.degrade(),
-            crs.degrade(),
-            rx_d0.degrade(),
-            rx_d1.degrade(),
-            tx_d0.degrade(),
-            tx_d1.degrade(),
-            tx_en.degrade(),
+            ref_clk.map_into(),
+            mdio.map_into(),
+            mdc.map_into(),
+            crs.map_into(),
+            rx_d0.map_into(),
+            rx_d1.map_into(),
+            tx_d0.map_into(),
+            tx_d1.map_into(),
+            tx_en.map_into(),
         ];
 
         let mut this = Self {
diff --git a/embassy-stm32/src/flash/mod.rs b/embassy-stm32/src/flash/mod.rs
index 2047f70e..bd64fdd7 100644
--- a/embassy-stm32/src/flash/mod.rs
+++ b/embassy-stm32/src/flash/mod.rs
@@ -1,6 +1,4 @@
-use core::marker::PhantomData;
-
-use embassy_hal_common::unborrow;
+use embassy_hal_common::{unborrow, Unborrowed};
 use embedded_storage::nor_flash::{ErrorType, NorFlash, NorFlashError, NorFlashErrorKind, ReadNorFlash};
 
 pub use crate::pac::{ERASE_SIZE, ERASE_VALUE, FLASH_BASE, FLASH_SIZE, WRITE_SIZE};
@@ -16,20 +14,16 @@ const FLASH_END: usize = FLASH_BASE + FLASH_SIZE;
 mod family;
 
 pub struct Flash<'d> {
-    _inner: FLASH,
-    _phantom: PhantomData<&'d mut FLASH>,
+    _inner: Unborrowed<'d, FLASH>,
 }
 
 impl<'d> Flash<'d> {
-    pub fn new(p: impl Unborrow<Target = FLASH>) -> Self {
+    pub fn new(p: impl Unborrow<Target = FLASH> + 'd) -> Self {
         unborrow!(p);
-        Self {
-            _inner: p,
-            _phantom: PhantomData,
-        }
+        Self { _inner: p }
     }
 
-    pub fn unlock(p: impl Unborrow<Target = FLASH>) -> Self {
+    pub fn unlock(p: impl Unborrow<Target = FLASH> + 'd) -> Self {
         let flash = Self::new(p);
 
         unsafe { family::unlock() };
diff --git a/embassy-stm32/src/gpio.rs b/embassy-stm32/src/gpio.rs
index 3bdaccce..92cd2bb2 100644
--- a/embassy-stm32/src/gpio.rs
+++ b/embassy-stm32/src/gpio.rs
@@ -1,8 +1,7 @@
 #![macro_use]
 use core::convert::Infallible;
-use core::marker::PhantomData;
 
-use embassy_hal_common::{impl_unborrow, unborrow};
+use embassy_hal_common::{impl_unborrow, unborrow, Unborrowed};
 
 use crate::pac::gpio::{self, vals};
 use crate::{pac, peripherals, Unborrow};
@@ -13,8 +12,7 @@ use crate::{pac, peripherals, Unborrow};
 /// set while not in output mode, so the pin's level will be 'remembered' when it is not in output
 /// mode.
 pub struct Flex<'d, T: Pin> {
-    pub(crate) pin: T,
-    phantom: PhantomData<&'d mut T>,
+    pub(crate) pin: Unborrowed<'d, T>,
 }
 
 impl<'d, T: Pin> Flex<'d, T> {
@@ -27,10 +25,7 @@ impl<'d, T: Pin> Flex<'d, T> {
     pub fn new(pin: impl Unborrow<Target = T> + 'd) -> Self {
         unborrow!(pin);
         // Pin will be in disconnected state.
-        Self {
-            pin,
-            phantom: PhantomData,
-        }
+        Self { pin }
     }
 
     /// Put the pin into input mode.
@@ -626,7 +621,7 @@ pub(crate) mod sealed {
     }
 }
 
-pub trait Pin: sealed::Pin + Sized + 'static {
+pub trait Pin: Into<AnyPin> + sealed::Pin + Sized + 'static {
     #[cfg(feature = "exti")]
     type ExtiChannel: crate::exti::Channel;
 
@@ -699,6 +694,12 @@ foreach_pin!(
                 $port_num * 16 + $pin_num
             }
         }
+
+        impl From<peripherals::$pin_name> for AnyPin {
+            fn from(x: peripherals::$pin_name) -> Self {
+                x.degrade()
+            }
+        }
     };
 );
 
diff --git a/embassy-stm32/src/i2c/v2.rs b/embassy-stm32/src/i2c/v2.rs
index 108ea7e3..ec7fec15 100644
--- a/embassy-stm32/src/i2c/v2.rs
+++ b/embassy-stm32/src/i2c/v2.rs
@@ -1,12 +1,11 @@
 use core::cmp;
-use core::marker::PhantomData;
 use core::task::Poll;
 
 use atomic_polyfill::{AtomicUsize, Ordering};
 use embassy::waitqueue::AtomicWaker;
 use embassy_embedded_hal::SetConfig;
 use embassy_hal_common::drop::OnDrop;
-use embassy_hal_common::unborrow;
+use embassy_hal_common::{unborrow, Unborrowed};
 use futures::future::poll_fn;
 
 use crate::dma::NoDma;
@@ -32,15 +31,15 @@ impl State {
 }
 
 pub struct I2c<'d, T: Instance, TXDMA = NoDma, RXDMA = NoDma> {
-    phantom: PhantomData<&'d mut T>,
-    tx_dma: TXDMA,
+    _peri: Unborrowed<'d, T>,
+    tx_dma: Unborrowed<'d, TXDMA>,
     #[allow(dead_code)]
-    rx_dma: RXDMA,
+    rx_dma: Unborrowed<'d, RXDMA>,
 }
 
 impl<'d, T: Instance, TXDMA, RXDMA> I2c<'d, T, TXDMA, RXDMA> {
     pub fn new(
-        _peri: impl Unborrow<Target = T> + 'd,
+        peri: impl Unborrow<Target = T> + 'd,
         scl: impl Unborrow<Target = impl SclPin<T>> + 'd,
         sda: impl Unborrow<Target = impl SdaPin<T>> + 'd,
         irq: impl Unborrow<Target = T::Interrupt> + 'd,
@@ -48,7 +47,7 @@ impl<'d, T: Instance, TXDMA, RXDMA> I2c<'d, T, TXDMA, RXDMA> {
         rx_dma: impl Unborrow<Target = RXDMA> + 'd,
         freq: Hertz,
     ) -> Self {
-        unborrow!(irq, scl, sda, tx_dma, rx_dma);
+        unborrow!(peri, irq, scl, sda, tx_dma, rx_dma);
 
         T::enable();
         T::reset();
@@ -88,7 +87,7 @@ impl<'d, T: Instance, TXDMA, RXDMA> I2c<'d, T, TXDMA, RXDMA> {
         irq.enable();
 
         Self {
-            phantom: PhantomData,
+            _peri: peri,
             tx_dma,
             rx_dma,
         }
diff --git a/embassy-stm32/src/lib.rs b/embassy-stm32/src/lib.rs
index 8b816858..f58ab2f9 100644
--- a/embassy-stm32/src/lib.rs
+++ b/embassy-stm32/src/lib.rs
@@ -75,7 +75,7 @@ pub(crate) mod _generated {
 // Reexports
 pub use _generated::{peripherals, Peripherals};
 pub use embassy_cortex_m::executor;
-pub use embassy_hal_common::{unborrow, Unborrow};
+pub use embassy_hal_common::{unborrow, Unborrow, Unborrowed};
 pub use embassy_macros::cortex_m_interrupt as interrupt;
 #[cfg(feature = "unstable-pac")]
 pub use stm32_metapac as pac;
diff --git a/embassy-stm32/src/pwm/simple_pwm.rs b/embassy-stm32/src/pwm/simple_pwm.rs
index 60aa110c..137d3145 100644
--- a/embassy-stm32/src/pwm/simple_pwm.rs
+++ b/embassy-stm32/src/pwm/simple_pwm.rs
@@ -1,6 +1,4 @@
-use core::marker::PhantomData;
-
-use embassy_hal_common::unborrow;
+use embassy_hal_common::{unborrow, Unborrowed};
 
 use super::*;
 #[allow(unused_imports)]
@@ -9,8 +7,7 @@ use crate::time::Hertz;
 use crate::Unborrow;
 
 pub struct SimplePwm<'d, T> {
-    phantom: PhantomData<&'d mut T>,
-    inner: T,
+    inner: Unborrowed<'d, T>,
 }
 
 macro_rules! config_pins {
@@ -83,10 +80,7 @@ impl<'d, T: CaptureCompare16bitInstance> SimplePwm<'d, T> {
 
         configure_pins();
 
-        let mut this = Self {
-            inner: tim,
-            phantom: PhantomData,
-        };
+        let mut this = Self { inner: tim };
 
         this.inner.set_frequency(freq);
         this.inner.start();
diff --git a/embassy-stm32/src/rng.rs b/embassy-stm32/src/rng.rs
index 5b3558c9..967fa71f 100644
--- a/embassy-stm32/src/rng.rs
+++ b/embassy-stm32/src/rng.rs
@@ -1,10 +1,9 @@
 #![macro_use]
 
-use core::marker::PhantomData;
 use core::task::Poll;
 
 use embassy::waitqueue::AtomicWaker;
-use embassy_hal_common::unborrow;
+use embassy_hal_common::{unborrow, Unborrowed};
 use futures::future::poll_fn;
 use rand_core::{CryptoRng, RngCore};
 
@@ -19,8 +18,7 @@ pub enum Error {
 }
 
 pub struct Rng<'d, T: Instance> {
-    _inner: T,
-    _phantom: PhantomData<&'d mut T>,
+    _inner: Unborrowed<'d, T>,
 }
 
 impl<'d, T: Instance> Rng<'d, T> {
@@ -28,10 +26,7 @@ impl<'d, T: Instance> Rng<'d, T> {
         T::enable();
         T::reset();
         unborrow!(inner);
-        let mut random = Self {
-            _inner: inner,
-            _phantom: PhantomData,
-        };
+        let mut random = Self { _inner: inner };
         random.reset();
         random
     }
diff --git a/embassy-stm32/src/sdmmc/mod.rs b/embassy-stm32/src/sdmmc/mod.rs
index d9450974..fbb48263 100644
--- a/embassy-stm32/src/sdmmc/mod.rs
+++ b/embassy-stm32/src/sdmmc/mod.rs
@@ -1,18 +1,17 @@
 #![macro_use]
 
 use core::default::Default;
-use core::marker::PhantomData;
 use core::task::Poll;
 
 use embassy::waitqueue::AtomicWaker;
 use embassy_hal_common::drop::OnDrop;
-use embassy_hal_common::unborrow;
+use embassy_hal_common::{unborrow, Unborrowed};
 use futures::future::poll_fn;
 use sdio_host::{BusWidth, CardCapacity, CardStatus, CurrentState, SDStatus, CID, CSD, OCR, SCR};
 
 use crate::dma::NoDma;
-use crate::gpio::sealed::AFType;
-use crate::gpio::{Pull, Speed};
+use crate::gpio::sealed::{AFType, Pin};
+use crate::gpio::{AnyPin, Pull, Speed};
 use crate::interrupt::{Interrupt, InterruptExt};
 use crate::pac::sdmmc::Sdmmc as RegBlock;
 use crate::rcc::RccPeripheral;
@@ -176,12 +175,19 @@ impl Default for Config {
 }
 
 /// Sdmmc device
-pub struct Sdmmc<'d, T: Instance, P: Pins<T>, Dma = NoDma> {
-    sdmmc: PhantomData<&'d mut T>,
-    pins: P,
-    irq: T::Interrupt,
+pub struct Sdmmc<'d, T: Instance, Dma = NoDma> {
+    _peri: Unborrowed<'d, T>,
+    irq: Unborrowed<'d, T::Interrupt>,
+    dma: Unborrowed<'d, Dma>,
+
+    clk: Unborrowed<'d, AnyPin>,
+    cmd: Unborrowed<'d, AnyPin>,
+    d0: Unborrowed<'d, AnyPin>,
+    d1: Option<Unborrowed<'d, AnyPin>>,
+    d2: Option<Unborrowed<'d, AnyPin>>,
+    d3: Option<Unborrowed<'d, AnyPin>>,
+
     config: Config,
-    dma: Dma,
     /// Current clock to card
     clock: Hertz,
     /// Current signalling scheme to card
@@ -191,16 +197,99 @@ pub struct Sdmmc<'d, T: Instance, P: Pins<T>, Dma = NoDma> {
 }
 
 #[cfg(sdmmc_v1)]
-impl<'d, T: Instance, P: Pins<T>, Dma: SdmmcDma<T>> Sdmmc<'d, T, P, Dma> {
-    pub fn new(
-        _peripheral: impl Unborrow<Target = T> + 'd,
-        pins: impl Unborrow<Target = P> + 'd,
+impl<'d, T: Instance, Dma: SdmmcDma<T>> Sdmmc<'d, T, Dma> {
+    pub fn new_1bit(
+        sdmmc: impl Unborrow<Target = T> + 'd,
         irq: impl Unborrow<Target = T::Interrupt> + 'd,
-        config: Config,
         dma: impl Unborrow<Target = Dma> + 'd,
+        clk: impl Unborrow<Target = impl CkPin<T>> + 'd,
+        cmd: impl Unborrow<Target = impl CmdPin<T>> + 'd,
+        d0: impl Unborrow<Target = impl D0Pin<T>> + 'd,
+        config: Config,
     ) -> Self {
-        unborrow!(irq, pins, dma);
-        pins.configure();
+        unborrow!(clk, cmd, d0);
+
+        critical_section::with(|_| unsafe {
+            clk.set_as_af_pull(clk.af_num(), AFType::OutputPushPull, Pull::None);
+            cmd.set_as_af_pull(cmd.af_num(), AFType::OutputPushPull, Pull::Up);
+            d0.set_as_af_pull(d0.af_num(), AFType::OutputPushPull, Pull::Up);
+
+            clk.set_speed(Speed::VeryHigh);
+            cmd.set_speed(Speed::VeryHigh);
+            d0.set_speed(Speed::VeryHigh);
+        });
+
+        Self::new_inner(
+            sdmmc,
+            irq,
+            dma,
+            clk.map_into(),
+            cmd.map_into(),
+            d0.map_into(),
+            None,
+            None,
+            None,
+            config,
+        )
+    }
+
+    pub fn new_4bit(
+        sdmmc: impl Unborrow<Target = T> + 'd,
+        irq: impl Unborrow<Target = T::Interrupt> + 'd,
+        dma: impl Unborrow<Target = Dma> + 'd,
+        clk: impl Unborrow<Target = impl CkPin<T>> + 'd,
+        cmd: impl Unborrow<Target = impl CmdPin<T>> + 'd,
+        d0: impl Unborrow<Target = impl D0Pin<T>> + 'd,
+        d1: impl Unborrow<Target = impl D1Pin<T>> + 'd,
+        d2: impl Unborrow<Target = impl D2Pin<T>> + 'd,
+        d3: impl Unborrow<Target = impl D3Pin<T>> + 'd,
+        config: Config,
+    ) -> Self {
+        unborrow!(clk, cmd, d0, d1, d2, d3);
+
+        critical_section::with(|_| unsafe {
+            clk.set_as_af_pull(clk.af_num(), AFType::OutputPushPull, Pull::None);
+            cmd.set_as_af_pull(cmd.af_num(), AFType::OutputPushPull, Pull::Up);
+            d0.set_as_af_pull(d0.af_num(), AFType::OutputPushPull, Pull::Up);
+            d1.set_as_af_pull(d1.af_num(), AFType::OutputPushPull, Pull::Up);
+            d2.set_as_af_pull(d2.af_num(), AFType::OutputPushPull, Pull::Up);
+            d3.set_as_af_pull(d3.af_num(), AFType::OutputPushPull, Pull::Up);
+
+            clk.set_speed(Speed::VeryHigh);
+            cmd.set_speed(Speed::VeryHigh);
+            d0.set_speed(Speed::VeryHigh);
+            d1.set_speed(Speed::VeryHigh);
+            d2.set_speed(Speed::VeryHigh);
+            d3.set_speed(Speed::VeryHigh);
+        });
+
+        Self::new_inner(
+            sdmmc,
+            irq,
+            dma,
+            clk.map_into(),
+            cmd.map_into(),
+            d0.map_into(),
+            Some(d1.map_into()),
+            Some(d2.map_into()),
+            Some(d3.map_into()),
+            config,
+        )
+    }
+
+    fn new_inner(
+        sdmmc: impl Unborrow<Target = T> + 'd,
+        irq: impl Unborrow<Target = T::Interrupt> + 'd,
+        dma: impl Unborrow<Target = Dma> + 'd,
+        clk: Unborrowed<'d, AnyPin>,
+        cmd: Unborrowed<'d, AnyPin>,
+        d0: Unborrowed<'d, AnyPin>,
+        d1: Option<Unborrowed<'d, AnyPin>>,
+        d2: Option<Unborrowed<'d, AnyPin>>,
+        d3: Option<Unborrowed<'d, AnyPin>>,
+        config: Config,
+    ) -> Self {
+        unborrow!(sdmmc, irq, dma);
 
         T::enable();
         T::reset();
@@ -213,11 +302,18 @@ impl<'d, T: Instance, P: Pins<T>, Dma: SdmmcDma<T>> Sdmmc<'d, T, P, Dma> {
         irq.enable();
 
         Self {
-            sdmmc: PhantomData,
-            pins,
+            _peri: sdmmc,
             irq,
-            config,
             dma,
+
+            clk,
+            cmd,
+            d0,
+            d1,
+            d2,
+            d3,
+
+            config,
             clock,
             signalling: Default::default(),
             card: None,
@@ -226,15 +322,94 @@ impl<'d, T: Instance, P: Pins<T>, Dma: SdmmcDma<T>> Sdmmc<'d, T, P, Dma> {
 }
 
 #[cfg(sdmmc_v2)]
-impl<'d, T: Instance, P: Pins<T>> Sdmmc<'d, T, P, NoDma> {
-    pub fn new(
-        _peripheral: impl Unborrow<Target = T> + 'd,
-        pins: impl Unborrow<Target = P> + 'd,
+impl<'d, T: Instance> Sdmmc<'d, T, NoDma> {
+    pub fn new_1bit(
+        sdmmc: impl Unborrow<Target = T> + 'd,
         irq: impl Unborrow<Target = T::Interrupt> + 'd,
+        clk: impl Unborrow<Target = impl CkPin<T>> + 'd,
+        cmd: impl Unborrow<Target = impl CmdPin<T>> + 'd,
+        d0: impl Unborrow<Target = impl D0Pin<T>> + 'd,
         config: Config,
     ) -> Self {
-        unborrow!(irq, pins);
-        pins.configure();
+        unborrow!(clk, cmd, d0);
+
+        critical_section::with(|_| unsafe {
+            clk.set_as_af_pull(clk.af_num(), AFType::OutputPushPull, Pull::None);
+            cmd.set_as_af_pull(cmd.af_num(), AFType::OutputPushPull, Pull::Up);
+            d0.set_as_af_pull(d0.af_num(), AFType::OutputPushPull, Pull::Up);
+
+            clk.set_speed(Speed::VeryHigh);
+            cmd.set_speed(Speed::VeryHigh);
+            d0.set_speed(Speed::VeryHigh);
+        });
+
+        Self::new_inner(
+            sdmmc,
+            irq,
+            clk.map_into(),
+            cmd.map_into(),
+            d0.map_into(),
+            None,
+            None,
+            None,
+            config,
+        )
+    }
+
+    pub fn new_4bit(
+        sdmmc: impl Unborrow<Target = T> + 'd,
+        irq: impl Unborrow<Target = T::Interrupt> + 'd,
+        clk: impl Unborrow<Target = impl CkPin<T>> + 'd,
+        cmd: impl Unborrow<Target = impl CmdPin<T>> + 'd,
+        d0: impl Unborrow<Target = impl D0Pin<T>> + 'd,
+        d1: impl Unborrow<Target = impl D1Pin<T>> + 'd,
+        d2: impl Unborrow<Target = impl D2Pin<T>> + 'd,
+        d3: impl Unborrow<Target = impl D3Pin<T>> + 'd,
+        config: Config,
+    ) -> Self {
+        unborrow!(clk, cmd, d0, d1, d2, d3);
+
+        critical_section::with(|_| unsafe {
+            clk.set_as_af_pull(clk.af_num(), AFType::OutputPushPull, Pull::None);
+            cmd.set_as_af_pull(cmd.af_num(), AFType::OutputPushPull, Pull::Up);
+            d0.set_as_af_pull(d0.af_num(), AFType::OutputPushPull, Pull::Up);
+            d1.set_as_af_pull(d1.af_num(), AFType::OutputPushPull, Pull::Up);
+            d2.set_as_af_pull(d2.af_num(), AFType::OutputPushPull, Pull::Up);
+            d3.set_as_af_pull(d3.af_num(), AFType::OutputPushPull, Pull::Up);
+
+            clk.set_speed(Speed::VeryHigh);
+            cmd.set_speed(Speed::VeryHigh);
+            d0.set_speed(Speed::VeryHigh);
+            d1.set_speed(Speed::VeryHigh);
+            d2.set_speed(Speed::VeryHigh);
+            d3.set_speed(Speed::VeryHigh);
+        });
+
+        Self::new_inner(
+            sdmmc,
+            irq,
+            clk.map_into(),
+            cmd.map_into(),
+            d0.map_into(),
+            Some(d1.map_into()),
+            Some(d2.map_into()),
+            Some(d3.map_into()),
+            config,
+        )
+    }
+
+    fn new_inner(
+        sdmmc: impl Unborrow<Target = T> + 'd,
+        irq: impl Unborrow<Target = T::Interrupt> + 'd,
+        clk: Unborrowed<'d, AnyPin>,
+        cmd: Unborrowed<'d, AnyPin>,
+        d0: Unborrowed<'d, AnyPin>,
+        d1: Option<Unborrowed<'d, AnyPin>>,
+        d2: Option<Unborrowed<'d, AnyPin>>,
+        d3: Option<Unborrowed<'d, AnyPin>>,
+        config: Config,
+    ) -> Self {
+        unborrow!(sdmmc, irq);
 
         T::enable();
         T::reset();
@@ -247,11 +422,18 @@ impl<'d, T: Instance, P: Pins<T>> Sdmmc<'d, T, P, NoDma> {
         irq.enable();
 
         Self {
-            sdmmc: PhantomData,
-            pins,
+            _peri: sdmmc,
             irq,
+            dma: NoDma.unborrow(),
+
+            clk,
+            cmd,
+            d0,
+            d1,
+            d2,
+            d3,
+
             config,
-            dma: NoDma,
             clock,
             signalling: Default::default(),
             card: None,
@@ -259,23 +441,28 @@ impl<'d, T: Instance, P: Pins<T>> Sdmmc<'d, T, P, NoDma> {
     }
 }
 
-impl<'d, T: Instance, P: Pins<T>, Dma: SdmmcDma<T>> Sdmmc<'d, T, P, Dma> {
+impl<'d, T: Instance, Dma: SdmmcDma<T>> Sdmmc<'d, T, Dma> {
     #[inline(always)]
     pub async fn init_card(&mut self, freq: Hertz) -> Result<(), Error> {
         let inner = T::inner();
         let freq = freq.into();
 
+        let bus_width = match self.d3.is_some() {
+            true => BusWidth::Four,
+            false => BusWidth::One,
+        };
+
         inner
             .init_card(
                 freq,
-                P::BUSWIDTH,
+                bus_width,
                 &mut self.card,
                 &mut self.signalling,
                 T::frequency(),
                 &mut self.clock,
                 T::state(),
                 self.config.data_transfer_timeout,
-                &mut self.dma,
+                &mut *self.dma,
             )
             .await
     }
@@ -295,7 +482,7 @@ impl<'d, T: Instance, P: Pins<T>, Dma: SdmmcDma<T>> Sdmmc<'d, T, P, Dma> {
                 card_capacity,
                 state,
                 self.config.data_transfer_timeout,
-                &mut self.dma,
+                &mut *self.dma,
             )
             .await
     }
@@ -314,7 +501,7 @@ impl<'d, T: Instance, P: Pins<T>, Dma: SdmmcDma<T>> Sdmmc<'d, T, P, Dma> {
                 card,
                 state,
                 self.config.data_transfer_timeout,
-                &mut self.dma,
+                &mut *self.dma,
             )
             .await
     }
@@ -345,12 +532,26 @@ impl<'d, T: Instance, P: Pins<T>, Dma: SdmmcDma<T>> Sdmmc<'d, T, P, Dma> {
     }
 }
 
-impl<'d, T: Instance, P: Pins<T>, Dma> Drop for Sdmmc<'d, T, P, Dma> {
+impl<'d, T: Instance, Dma> Drop for Sdmmc<'d, T, Dma> {
     fn drop(&mut self) {
         self.irq.disable();
         let inner = T::inner();
         unsafe { inner.on_drop() };
-        self.pins.deconfigure();
+
+        critical_section::with(|_| unsafe {
+            self.clk.set_as_disconnected();
+            self.cmd.set_as_disconnected();
+            self.d0.set_as_disconnected();
+            if let Some(x) = &mut self.d1 {
+                x.set_as_disconnected();
+            }
+            if let Some(x) = &mut self.d2 {
+                x.set_as_disconnected();
+            }
+            if let Some(x) = &mut self.d3 {
+                x.set_as_disconnected();
+            }
+        });
     }
 }
 
@@ -1296,114 +1497,6 @@ cfg_if::cfg_if! {
     }
 }
 
-pub trait Pins<T: Instance>: sealed::Pins<T> + 'static {
-    const BUSWIDTH: BusWidth;
-
-    fn configure(&mut self);
-    fn deconfigure(&mut self);
-}
-
-impl<T, CLK, CMD, D0, D1, D2, D3> sealed::Pins<T> for (CLK, CMD, D0, D1, D2, D3)
-where
-    T: Instance,
-    CLK: CkPin<T>,
-    CMD: CmdPin<T>,
-    D0: D0Pin<T>,
-    D1: D1Pin<T>,
-    D2: D2Pin<T>,
-    D3: D3Pin<T>,
-{
-}
-
-impl<T, CLK, CMD, D0> sealed::Pins<T> for (CLK, CMD, D0)
-where
-    T: Instance,
-    CLK: CkPin<T>,
-    CMD: CmdPin<T>,
-    D0: D0Pin<T>,
-{
-}
-
-impl<T, CLK, CMD, D0, D1, D2, D3> Pins<T> for (CLK, CMD, D0, D1, D2, D3)
-where
-    T: Instance,
-    CLK: CkPin<T>,
-    CMD: CmdPin<T>,
-    D0: D0Pin<T>,
-    D1: D1Pin<T>,
-    D2: D2Pin<T>,
-    D3: D3Pin<T>,
-{
-    const BUSWIDTH: BusWidth = BusWidth::Four;
-
-    fn configure(&mut self) {
-        let (clk_pin, cmd_pin, d0_pin, d1_pin, d2_pin, d3_pin) = self;
-
-        critical_section::with(|_| unsafe {
-            clk_pin.set_as_af_pull(clk_pin.af_num(), AFType::OutputPushPull, Pull::None);
-            cmd_pin.set_as_af_pull(cmd_pin.af_num(), AFType::OutputPushPull, Pull::Up);
-            d0_pin.set_as_af_pull(d0_pin.af_num(), AFType::OutputPushPull, Pull::Up);
-            d1_pin.set_as_af_pull(d1_pin.af_num(), AFType::OutputPushPull, Pull::Up);
-            d2_pin.set_as_af_pull(d2_pin.af_num(), AFType::OutputPushPull, Pull::Up);
-            d3_pin.set_as_af_pull(d3_pin.af_num(), AFType::OutputPushPull, Pull::Up);
-
-            clk_pin.set_speed(Speed::VeryHigh);
-            cmd_pin.set_speed(Speed::VeryHigh);
-            d0_pin.set_speed(Speed::VeryHigh);
-            d1_pin.set_speed(Speed::VeryHigh);
-            d2_pin.set_speed(Speed::VeryHigh);
-            d3_pin.set_speed(Speed::VeryHigh);
-        });
-    }
-
-    fn deconfigure(&mut self) {
-        let (clk_pin, cmd_pin, d0_pin, d1_pin, d2_pin, d3_pin) = self;
-
-        critical_section::with(|_| unsafe {
-            clk_pin.set_as_disconnected();
-            cmd_pin.set_as_disconnected();
-            d0_pin.set_as_disconnected();
-            d1_pin.set_as_disconnected();
-            d2_pin.set_as_disconnected();
-            d3_pin.set_as_disconnected();
-        });
-    }
-}
-
-impl<T, CLK, CMD, D0> Pins<T> for (CLK, CMD, D0)
-where
-    T: Instance,
-    CLK: CkPin<T>,
-    CMD: CmdPin<T>,
-    D0: D0Pin<T>,
-{
-    const BUSWIDTH: BusWidth = BusWidth::One;
-
-    fn configure(&mut self) {
-        let (clk_pin, cmd_pin, d0_pin) = self;
-
-        critical_section::with(|_| unsafe {
-            clk_pin.set_as_af_pull(clk_pin.af_num(), AFType::OutputPushPull, Pull::None);
-            cmd_pin.set_as_af_pull(cmd_pin.af_num(), AFType::OutputPushPull, Pull::Up);
-            d0_pin.set_as_af_pull(d0_pin.af_num(), AFType::OutputPushPull, Pull::Up);
-
-            clk_pin.set_speed(Speed::VeryHigh);
-            cmd_pin.set_speed(Speed::VeryHigh);
-            d0_pin.set_speed(Speed::VeryHigh);
-        });
-    }
-
-    fn deconfigure(&mut self) {
-        let (clk_pin, cmd_pin, d0_pin) = self;
-
-        critical_section::with(|_| unsafe {
-            clk_pin.set_as_disconnected();
-            cmd_pin.set_as_disconnected();
-            d0_pin.set_as_disconnected();
-        });
-    }
-}
-
 foreach_peripheral!(
     (sdmmc, $inst:ident) => {
         impl sealed::Instance for peripherals::$inst {
diff --git a/embassy-stm32/src/spi/mod.rs b/embassy-stm32/src/spi/mod.rs
index a02f4492..595957b2 100644
--- a/embassy-stm32/src/spi/mod.rs
+++ b/embassy-stm32/src/spi/mod.rs
@@ -1,10 +1,9 @@
 #![macro_use]
 
-use core::marker::PhantomData;
 use core::ptr;
 
 use embassy_embedded_hal::SetConfig;
-use embassy_hal_common::unborrow;
+use embassy_hal_common::{unborrow, Unborrowed};
 pub use embedded_hal_02::spi::{Mode, Phase, Polarity, MODE_0, MODE_1, MODE_2, MODE_3};
 use futures::future::join;
 
@@ -73,13 +72,13 @@ impl Config {
 }
 
 pub struct Spi<'d, T: Instance, Tx, Rx> {
-    sck: Option<AnyPin>,
-    mosi: Option<AnyPin>,
-    miso: Option<AnyPin>,
-    txdma: Tx,
-    rxdma: Rx,
+    _peri: Unborrowed<'d, T>,
+    sck: Option<Unborrowed<'d, AnyPin>>,
+    mosi: Option<Unborrowed<'d, AnyPin>>,
+    miso: Option<Unborrowed<'d, AnyPin>>,
+    txdma: Unborrowed<'d, Tx>,
+    rxdma: Unborrowed<'d, Rx>,
     current_word_size: WordSize,
-    phantom: PhantomData<&'d mut T>,
 }
 
 impl<'d, T: Instance, Tx, Rx> Spi<'d, T, Tx, Rx> {
@@ -93,7 +92,7 @@ impl<'d, T: Instance, Tx, Rx> Spi<'d, T, Tx, Rx> {
         freq: Hertz,
         config: Config,
     ) -> Self {
-        unborrow!(sck, mosi, miso);
+        unborrow!(peri, sck, mosi, miso);
         unsafe {
             sck.set_as_af(sck.af_num(), AFType::OutputPushPull);
             #[cfg(any(spi_v2, spi_v3, spi_v4))]
@@ -108,9 +107,9 @@ impl<'d, T: Instance, Tx, Rx> Spi<'d, T, Tx, Rx> {
 
         Self::new_inner(
             peri,
-            Some(sck.degrade()),
-            Some(mosi.degrade()),
-            Some(miso.degrade()),
+            Some(sck.map_into()),
+            Some(mosi.map_into()),
+            Some(miso.map_into()),
             txdma,
             rxdma,
             freq,
@@ -139,9 +138,9 @@ impl<'d, T: Instance, Tx, Rx> Spi<'d, T, Tx, Rx> {
 
         Self::new_inner(
             peri,
-            Some(sck.degrade()),
+            Some(sck.map_into()),
             None,
-            Some(miso.degrade()),
+            Some(miso.map_into()),
             txdma,
             rxdma,
             freq,
@@ -170,8 +169,8 @@ impl<'d, T: Instance, Tx, Rx> Spi<'d, T, Tx, Rx> {
 
         Self::new_inner(
             peri,
-            Some(sck.degrade()),
-            Some(mosi.degrade()),
+            Some(sck.map_into()),
+            Some(mosi.map_into()),
             None,
             txdma,
             rxdma,
@@ -181,16 +180,16 @@ impl<'d, T: Instance, Tx, Rx> Spi<'d, T, Tx, Rx> {
     }
 
     fn new_inner(
-        _peri: impl Unborrow<Target = T> + 'd,
-        sck: Option<AnyPin>,
-        mosi: Option<AnyPin>,
-        miso: Option<AnyPin>,
+        peri: impl Unborrow<Target = T> + 'd,
+        sck: Option<Unborrowed<'d, AnyPin>>,
+        mosi: Option<Unborrowed<'d, AnyPin>>,
+        miso: Option<Unborrowed<'d, AnyPin>>,
         txdma: impl Unborrow<Target = Tx> + 'd,
         rxdma: impl Unborrow<Target = Rx> + 'd,
         freq: Hertz,
         config: Config,
     ) -> Self {
-        unborrow!(txdma, rxdma);
+        unborrow!(peri, txdma, rxdma);
 
         let pclk = T::frequency();
         let br = compute_baud_rate(pclk, freq.into());
@@ -280,13 +279,13 @@ impl<'d, T: Instance, Tx, Rx> Spi<'d, T, Tx, Rx> {
         }
 
         Self {
+            _peri: peri,
             sck,
             mosi,
             miso,
             txdma,
             rxdma,
             current_word_size: WordSize::EightBit,
-            phantom: PhantomData,
         }
     }
 
@@ -995,7 +994,7 @@ pub trait Word: Copy + 'static + sealed::Word + Default + crate::dma::Word {}
 impl Word for u8 {}
 impl Word for u16 {}
 
-pub trait Instance: sealed::Instance + RccPeripheral {}
+pub trait Instance: Unborrow<Target = Self> + sealed::Instance + RccPeripheral {}
 pin_trait!(SckPin, Instance);
 pin_trait!(MosiPin, Instance);
 pin_trait!(MisoPin, Instance);
diff --git a/embassy-stm32/src/usart/mod.rs b/embassy-stm32/src/usart/mod.rs
index a893e4b8..6b12378d 100644
--- a/embassy-stm32/src/usart/mod.rs
+++ b/embassy-stm32/src/usart/mod.rs
@@ -2,7 +2,7 @@
 
 use core::marker::PhantomData;
 
-use embassy_hal_common::unborrow;
+use embassy_hal_common::{unborrow, Unborrowed};
 
 use crate::dma::NoDma;
 use crate::gpio::sealed::AFType;
@@ -72,23 +72,22 @@ pub enum Error {
 }
 
 pub struct Uart<'d, T: Instance, TxDma = NoDma, RxDma = NoDma> {
-    phantom: PhantomData<&'d mut T>,
     tx: UartTx<'d, T, TxDma>,
     rx: UartRx<'d, T, RxDma>,
 }
 
 pub struct UartTx<'d, T: Instance, TxDma = NoDma> {
     phantom: PhantomData<&'d mut T>,
-    tx_dma: TxDma,
+    tx_dma: Unborrowed<'d, TxDma>,
 }
 
 pub struct UartRx<'d, T: Instance, RxDma = NoDma> {
     phantom: PhantomData<&'d mut T>,
-    rx_dma: RxDma,
+    rx_dma: Unborrowed<'d, RxDma>,
 }
 
 impl<'d, T: Instance, TxDma> UartTx<'d, T, TxDma> {
-    fn new(tx_dma: TxDma) -> Self {
+    fn new(tx_dma: Unborrowed<'d, TxDma>) -> Self {
         Self {
             tx_dma,
             phantom: PhantomData,
@@ -134,7 +133,7 @@ impl<'d, T: Instance, TxDma> UartTx<'d, T, TxDma> {
 }
 
 impl<'d, T: Instance, RxDma> UartRx<'d, T, RxDma> {
-    fn new(rx_dma: RxDma) -> Self {
+    fn new(rx_dma: Unborrowed<'d, RxDma>) -> Self {
         Self {
             rx_dma,
             phantom: PhantomData,
@@ -234,7 +233,6 @@ impl<'d, T: Instance, TxDma, RxDma> Uart<'d, T, TxDma, RxDma> {
         }
 
         Self {
-            phantom: PhantomData,
             tx: UartTx::new(tx_dma),
             rx: UartRx::new(rx_dma),
         }
diff --git a/examples/stm32f4/src/bin/sdmmc.rs b/examples/stm32f4/src/bin/sdmmc.rs
index 66567026..752ad57b 100644
--- a/examples/stm32f4/src/bin/sdmmc.rs
+++ b/examples/stm32f4/src/bin/sdmmc.rs
@@ -21,12 +21,17 @@ async fn main(_spawner: Spawner, p: Peripherals) -> ! {
 
     let irq = interrupt::take!(SDIO);
 
-    let mut sdmmc = Sdmmc::new(
+    let mut sdmmc = Sdmmc::new_4bit(
         p.SDIO,
-        (p.PC12, p.PD2, p.PC8, p.PC9, p.PC10, p.PC11),
         irq,
-        Default::default(),
         p.DMA2_CH3,
+        p.PC12,
+        p.PD2,
+        p.PC8,
+        p.PC9,
+        p.PC10,
+        p.PC11,
+        Default::default(),
     );
 
     // Should print 400kHz for initialization
diff --git a/examples/stm32f7/src/bin/sdmmc.rs b/examples/stm32f7/src/bin/sdmmc.rs
index 011e1fd9..be1c2b15 100644
--- a/examples/stm32f7/src/bin/sdmmc.rs
+++ b/examples/stm32f7/src/bin/sdmmc.rs
@@ -21,12 +21,17 @@ async fn main(_spawner: Spawner, p: Peripherals) -> ! {
 
     let irq = interrupt::take!(SDMMC1);
 
-    let mut sdmmc = Sdmmc::new(
+    let mut sdmmc = Sdmmc::new_4bit(
         p.SDMMC1,
-        (p.PC12, p.PD2, p.PC8, p.PC9, p.PC10, p.PC11),
         irq,
-        Default::default(),
         p.DMA2_CH3,
+        p.PC12,
+        p.PD2,
+        p.PC8,
+        p.PC9,
+        p.PC10,
+        p.PC11,
+        Default::default(),
     );
 
     // Should print 400kHz for initialization
diff --git a/examples/stm32h7/src/bin/low_level_timer_api.rs b/examples/stm32h7/src/bin/low_level_timer_api.rs
index fc19d84e..e54f1bb6 100644
--- a/examples/stm32h7/src/bin/low_level_timer_api.rs
+++ b/examples/stm32h7/src/bin/low_level_timer_api.rs
@@ -2,8 +2,6 @@
 #![no_main]
 #![feature(type_alias_impl_trait)]
 
-use core::marker::PhantomData;
-
 use defmt::*;
 use embassy::executor::Spawner;
 use embassy::time::{Duration, Timer};
@@ -11,7 +9,7 @@ use embassy_stm32::gpio::low_level::AFType;
 use embassy_stm32::gpio::Speed;
 use embassy_stm32::pwm::*;
 use embassy_stm32::time::{khz, mhz, Hertz};
-use embassy_stm32::{unborrow, Config, Peripherals, Unborrow};
+use embassy_stm32::{unborrow, Config, Peripherals, Unborrow, Unborrowed};
 use {defmt_rtt as _, panic_probe as _};
 
 pub fn config() -> Config {
@@ -49,8 +47,7 @@ async fn main(_spawner: Spawner, p: Peripherals) {
     }
 }
 pub struct SimplePwm32<'d, T: CaptureCompare32bitInstance> {
-    phantom: PhantomData<&'d mut T>,
-    inner: T,
+    inner: Unborrowed<'d, T>,
 }
 
 impl<'d, T: CaptureCompare32bitInstance> SimplePwm32<'d, T> {
@@ -78,10 +75,7 @@ impl<'d, T: CaptureCompare32bitInstance> SimplePwm32<'d, T> {
             ch4.set_as_af(ch1.af_num(), AFType::OutputPushPull);
         }
 
-        let mut this = Self {
-            inner: tim,
-            phantom: PhantomData,
-        };
+        let mut this = Self { inner: tim };
 
         this.set_freq(freq);
         this.inner.start();
diff --git a/examples/stm32h7/src/bin/sdmmc.rs b/examples/stm32h7/src/bin/sdmmc.rs
index 787f700a..163807d8 100644
--- a/examples/stm32h7/src/bin/sdmmc.rs
+++ b/examples/stm32h7/src/bin/sdmmc.rs
@@ -21,10 +21,15 @@ async fn main(_spawner: Spawner, p: Peripherals) -> ! {
 
     let irq = interrupt::take!(SDMMC1);
 
-    let mut sdmmc = Sdmmc::new(
+    let mut sdmmc = Sdmmc::new_4bit(
         p.SDMMC1,
-        (p.PC12, p.PD2, p.PC8, p.PC9, p.PC10, p.PC11),
         irq,
+        p.PC12,
+        p.PD2,
+        p.PC8,
+        p.PC9,
+        p.PC10,
+        p.PC11,
         Default::default(),
     );