diff --git a/embassy-extras/src/macros.rs b/embassy-extras/src/macros.rs
index 832e76d68..d85439358 100644
--- a/embassy-extras/src/macros.rs
+++ b/embassy-extras/src/macros.rs
@@ -16,7 +16,7 @@ macro_rules! peripherals {
                 }
 
                 $(#[$cfg])?
-                impl embassy::util::PeripheralBorrow for $name {
+                impl embassy::util::Unborrow for $name {
                     type Target = $name;
                     #[inline]
                     unsafe fn unborrow(self) -> $name {
@@ -25,7 +25,7 @@ macro_rules! peripherals {
                 }
 
                 $(#[$cfg])?
-                impl embassy::util::PeripheralBorrow for &mut $name {
+                impl embassy::util::Unborrow for &mut $name {
                     type Target = $name;
                     #[inline]
                     unsafe fn unborrow(self) -> $name {
@@ -89,7 +89,7 @@ macro_rules! unborrow {
 #[macro_export]
 macro_rules! impl_unborrow {
     ($type:ident) => {
-        impl ::embassy::util::PeripheralBorrow for $type {
+        impl ::embassy::util::Unborrow for $type {
             type Target = $type;
             #[inline]
             unsafe fn unborrow(self) -> Self::Target {
@@ -97,7 +97,7 @@ macro_rules! impl_unborrow {
             }
         }
 
-        impl<'a> ::embassy::util::PeripheralBorrow for &'a mut $type {
+        impl<'a> ::embassy::util::Unborrow for &'a mut $type {
             type Target = $type;
             #[inline]
             unsafe fn unborrow(self) -> Self::Target {
diff --git a/embassy-macros/src/lib.rs b/embassy-macros/src/lib.rs
index 402f0e08a..cca6c8a56 100644
--- a/embassy-macros/src/lib.rs
+++ b/embassy-macros/src/lib.rs
@@ -147,14 +147,14 @@ pub fn interrupt_declare(item: TokenStream) -> TokenStream {
             }
         }
 
-        impl ::embassy::util::PeripheralBorrow for #name_interrupt {
+        impl ::embassy::util::Unborrow for #name_interrupt {
             type Target = #name_interrupt;
             unsafe fn unborrow(self) -> #name_interrupt {
                 self
             }
         }
 
-        impl ::embassy::util::PeripheralBorrow for &mut #name_interrupt {
+        impl ::embassy::util::Unborrow for &mut #name_interrupt {
             type Target = #name_interrupt;
             unsafe fn unborrow(self) -> #name_interrupt {
                 ::core::ptr::read(self)
diff --git a/embassy-nrf/src/buffered_uarte.rs b/embassy-nrf/src/buffered_uarte.rs
index 9e67aaef6..49e8dd2b6 100644
--- a/embassy-nrf/src/buffered_uarte.rs
+++ b/embassy-nrf/src/buffered_uarte.rs
@@ -5,7 +5,7 @@ use core::sync::atomic::{compiler_fence, Ordering};
 use core::task::{Context, Poll};
 use embassy::interrupt::InterruptExt;
 use embassy::io::{AsyncBufRead, AsyncWrite, Result};
-use embassy::util::{PeripheralBorrow, WakerRegistration};
+use embassy::util::{Unborrow, WakerRegistration};
 use embassy_extras::peripheral::{PeripheralMutex, PeripheralState};
 use embassy_extras::ring_buffer::RingBuffer;
 use embassy_extras::{low_power_wait_until, unborrow};
@@ -63,15 +63,15 @@ pub struct BufferedUarte<'d, U: UarteInstance, T: TimerInstance> {
 impl<'d, U: UarteInstance, T: TimerInstance> BufferedUarte<'d, U, T> {
     /// unsafe: may not leak self or futures
     pub unsafe fn new(
-        uarte: impl PeripheralBorrow<Target = U> + 'd,
-        timer: impl PeripheralBorrow<Target = T> + 'd,
-        ppi_ch1: impl PeripheralBorrow<Target = impl ConfigurableChannel> + 'd,
-        ppi_ch2: impl PeripheralBorrow<Target = impl ConfigurableChannel> + 'd,
-        irq: impl PeripheralBorrow<Target = U::Interrupt> + 'd,
-        rxd: impl PeripheralBorrow<Target = impl GpioPin> + 'd,
-        txd: impl PeripheralBorrow<Target = impl GpioPin> + 'd,
-        cts: impl PeripheralBorrow<Target = impl GpioOptionalPin> + 'd,
-        rts: impl PeripheralBorrow<Target = impl GpioOptionalPin> + 'd,
+        uarte: impl Unborrow<Target = U> + 'd,
+        timer: impl Unborrow<Target = T> + 'd,
+        ppi_ch1: impl Unborrow<Target = impl ConfigurableChannel> + 'd,
+        ppi_ch2: impl Unborrow<Target = impl ConfigurableChannel> + 'd,
+        irq: impl Unborrow<Target = U::Interrupt> + 'd,
+        rxd: impl Unborrow<Target = impl GpioPin> + 'd,
+        txd: impl Unborrow<Target = impl GpioPin> + 'd,
+        cts: impl Unborrow<Target = impl GpioOptionalPin> + 'd,
+        rts: impl Unborrow<Target = impl GpioOptionalPin> + 'd,
         config: Config,
         rx_buffer: &'d mut [u8],
         tx_buffer: &'d mut [u8],
diff --git a/embassy-nrf/src/gpio.rs b/embassy-nrf/src/gpio.rs
index 5a5f7b8da..a06ee6053 100644
--- a/embassy-nrf/src/gpio.rs
+++ b/embassy-nrf/src/gpio.rs
@@ -2,7 +2,7 @@ use core::convert::Infallible;
 use core::hint::unreachable_unchecked;
 use core::marker::PhantomData;
 
-use embassy::util::PeripheralBorrow;
+use embassy::util::Unborrow;
 use embassy_extras::{impl_unborrow, unborrow};
 use embedded_hal::digital::v2::{InputPin, OutputPin, StatefulOutputPin};
 use gpio::pin_cnf::DRIVE_A;
@@ -38,7 +38,7 @@ pub struct Input<'d, T: Pin> {
 }
 
 impl<'d, T: Pin> Input<'d, T> {
-    pub fn new(pin: impl PeripheralBorrow<Target = T> + 'd, pull: Pull) -> Self {
+    pub fn new(pin: impl Unborrow<Target = T> + 'd, pull: Pull) -> Self {
         unborrow!(pin);
 
         pin.conf().write(|w| {
@@ -123,7 +123,7 @@ pub struct Output<'d, T: Pin> {
 
 impl<'d, T: Pin> Output<'d, T> {
     pub fn new(
-        pin: impl PeripheralBorrow<Target = T> + 'd,
+        pin: impl Unborrow<Target = T> + 'd,
         initial_output: Level,
         drive: OutputDrive,
     ) -> Self {
diff --git a/embassy-nrf/src/ppi.rs b/embassy-nrf/src/ppi.rs
index 6487267da..e8bcbd603 100644
--- a/embassy-nrf/src/ppi.rs
+++ b/embassy-nrf/src/ppi.rs
@@ -11,7 +11,7 @@
 
 use core::marker::PhantomData;
 use core::ptr::NonNull;
-use embassy::util::PeripheralBorrow;
+use embassy::util::Unborrow;
 use embassy_extras::{impl_unborrow, unborrow};
 
 use crate::{pac, peripherals};
@@ -25,7 +25,7 @@ pub struct Ppi<'d, C: Channel> {
 }
 
 impl<'d, C: Channel> Ppi<'d, C> {
-    pub fn new(ch: impl PeripheralBorrow<Target = C> + 'd) -> Self {
+    pub fn new(ch: impl Unborrow<Target = C> + 'd) -> Self {
         unborrow!(ch);
         let mut this = Self {
             ch,
diff --git a/embassy-nrf/src/qspi.rs b/embassy-nrf/src/qspi.rs
index d682c1b8c..f683138d6 100644
--- a/embassy-nrf/src/qspi.rs
+++ b/embassy-nrf/src/qspi.rs
@@ -3,7 +3,7 @@ use core::marker::PhantomData;
 use core::task::Poll;
 use embassy::interrupt::{Interrupt, InterruptExt};
 use embassy::traits::flash::{Error, Flash};
-use embassy::util::{AtomicWaker, DropBomb, PeripheralBorrow};
+use embassy::util::{AtomicWaker, DropBomb, Unborrow};
 use embassy_extras::unborrow;
 use futures::future::poll_fn;
 
@@ -61,14 +61,14 @@ pub struct Qspi<'d, T: Instance> {
 
 impl<'d, T: Instance> Qspi<'d, T> {
     pub fn new(
-        qspi: impl PeripheralBorrow<Target = T> + 'd,
-        irq: impl PeripheralBorrow<Target = T::Interrupt> + 'd,
-        sck: impl PeripheralBorrow<Target = impl GpioPin> + 'd,
-        csn: impl PeripheralBorrow<Target = impl GpioPin> + 'd,
-        io0: impl PeripheralBorrow<Target = impl GpioPin> + 'd,
-        io1: impl PeripheralBorrow<Target = impl GpioPin> + 'd,
-        io2: impl PeripheralBorrow<Target = impl GpioPin> + 'd,
-        io3: impl PeripheralBorrow<Target = impl GpioPin> + 'd,
+        qspi: impl Unborrow<Target = T> + 'd,
+        irq: impl Unborrow<Target = T::Interrupt> + 'd,
+        sck: impl Unborrow<Target = impl GpioPin> + 'd,
+        csn: impl Unborrow<Target = impl GpioPin> + 'd,
+        io0: impl Unborrow<Target = impl GpioPin> + 'd,
+        io1: impl Unborrow<Target = impl GpioPin> + 'd,
+        io2: impl Unborrow<Target = impl GpioPin> + 'd,
+        io3: impl Unborrow<Target = impl GpioPin> + 'd,
         config: Config,
     ) -> Self {
         unborrow!(qspi, irq, sck, csn, io0, io1, io2, io3);
diff --git a/embassy-nrf/src/saadc.rs b/embassy-nrf/src/saadc.rs
index b854ce780..448d0334c 100644
--- a/embassy-nrf/src/saadc.rs
+++ b/embassy-nrf/src/saadc.rs
@@ -3,15 +3,12 @@ use core::marker::PhantomData;
 use core::pin::Pin;
 use core::sync::atomic::{compiler_fence, Ordering};
 use core::task::Poll;
-use embassy::traits;
-use embassy::util::{wake_on_interrupt, PeripheralBorrow};
+use embassy::util::{wake_on_interrupt, Unborrow};
 use embassy_extras::unborrow;
 use futures::future::poll_fn;
-use traits::spi::FullDuplex;
 
-use crate::gpio::Pin as GpioPin;
-use crate::interrupt::{self, Interrupt};
-use crate::{pac, peripherals, slice_in_ram_or};
+use crate::interrupt;
+use crate::{pac, peripherals};
 
 #[cfg(feature = "9160")]
 use pac::{saadc_ns as saadc, SAADC_NS as SAADC};
@@ -74,9 +71,9 @@ impl Default for Config {
 
 impl<'d, T: PositivePin> OneShot<'d, T> {
     pub fn new(
-        saadc: impl PeripheralBorrow<Target = peripherals::SAADC> + 'd,
-        irq: impl PeripheralBorrow<Target = interrupt::SAADC> + 'd,
-        positive_pin: impl PeripheralBorrow<Target = T> + 'd,
+        saadc: impl Unborrow<Target = peripherals::SAADC> + 'd,
+        irq: impl Unborrow<Target = interrupt::SAADC> + 'd,
+        positive_pin: impl Unborrow<Target = T> + 'd,
         config: Config,
     ) -> Self {
         unborrow!(saadc, irq, positive_pin);
diff --git a/embassy-nrf/src/spim.rs b/embassy-nrf/src/spim.rs
index bbe1eedf9..d6b9ee8d8 100644
--- a/embassy-nrf/src/spim.rs
+++ b/embassy-nrf/src/spim.rs
@@ -4,7 +4,7 @@ use core::sync::atomic::{compiler_fence, Ordering};
 use core::task::Poll;
 use embassy::interrupt::InterruptExt;
 use embassy::traits;
-use embassy::util::{AtomicWaker, PeripheralBorrow};
+use embassy::util::{AtomicWaker, Unborrow};
 use embassy_extras::unborrow;
 use futures::future::poll_fn;
 use traits::spi::FullDuplex;
@@ -41,11 +41,11 @@ pub struct Config {
 
 impl<'d, T: Instance> Spim<'d, T> {
     pub fn new(
-        spim: impl PeripheralBorrow<Target = T> + 'd,
-        irq: impl PeripheralBorrow<Target = T::Interrupt> + 'd,
-        sck: impl PeripheralBorrow<Target = impl GpioPin> + 'd,
-        miso: impl PeripheralBorrow<Target = impl OptionalPin> + 'd,
-        mosi: impl PeripheralBorrow<Target = impl OptionalPin> + 'd,
+        spim: impl Unborrow<Target = T> + 'd,
+        irq: impl Unborrow<Target = T::Interrupt> + 'd,
+        sck: impl Unborrow<Target = impl GpioPin> + 'd,
+        miso: impl Unborrow<Target = impl OptionalPin> + 'd,
+        mosi: impl Unborrow<Target = impl OptionalPin> + 'd,
         config: Config,
     ) -> Self {
         unborrow!(spim, irq, sck, miso, mosi);
diff --git a/embassy-nrf/src/uarte.rs b/embassy-nrf/src/uarte.rs
index 9e485907c..a02f7c347 100644
--- a/embassy-nrf/src/uarte.rs
+++ b/embassy-nrf/src/uarte.rs
@@ -6,7 +6,7 @@ use core::sync::atomic::{compiler_fence, Ordering};
 use core::task::Poll;
 use embassy::interrupt::InterruptExt;
 use embassy::traits::uart::{Error, Read, Write};
-use embassy::util::{AtomicWaker, OnDrop, PeripheralBorrow};
+use embassy::util::{AtomicWaker, OnDrop, Unborrow};
 use embassy_extras::unborrow;
 use futures::future::poll_fn;
 
@@ -54,12 +54,12 @@ impl<'d, T: Instance> Uarte<'d, T> {
     /// or [`receive`](Uarte::receive).
     #[allow(unused_unsafe)]
     pub unsafe fn new(
-        uarte: impl PeripheralBorrow<Target = T> + 'd,
-        irq: impl PeripheralBorrow<Target = T::Interrupt> + 'd,
-        rxd: impl PeripheralBorrow<Target = impl GpioPin> + 'd,
-        txd: impl PeripheralBorrow<Target = impl GpioPin> + 'd,
-        cts: impl PeripheralBorrow<Target = impl GpioOptionalPin> + 'd,
-        rts: impl PeripheralBorrow<Target = impl GpioOptionalPin> + 'd,
+        uarte: impl Unborrow<Target = T> + 'd,
+        irq: impl Unborrow<Target = T::Interrupt> + 'd,
+        rxd: impl Unborrow<Target = impl GpioPin> + 'd,
+        txd: impl Unborrow<Target = impl GpioPin> + 'd,
+        cts: impl Unborrow<Target = impl GpioOptionalPin> + 'd,
+        rts: impl Unborrow<Target = impl GpioOptionalPin> + 'd,
         config: Config,
     ) -> Self {
         unborrow!(uarte, irq, rxd, txd, cts, rts);
diff --git a/embassy-rp/src/gpio.rs b/embassy-rp/src/gpio.rs
index 46a7b5a15..ecfad1878 100644
--- a/embassy-rp/src/gpio.rs
+++ b/embassy-rp/src/gpio.rs
@@ -5,7 +5,7 @@ use crate::pac::generic::{Reg, RW};
 use crate::pac::SIO;
 use crate::peripherals;
 
-use embassy::util::PeripheralBorrow;
+use embassy::util::Unborrow;
 use embassy_extras::{impl_unborrow, unborrow};
 use embedded_hal::digital::v2::{InputPin, OutputPin, StatefulOutputPin};
 
@@ -37,7 +37,7 @@ pub struct Input<'d, T: Pin> {
 }
 
 impl<'d, T: Pin> Input<'d, T> {
-    pub fn new(pin: impl PeripheralBorrow<Target = T> + 'd, pull: Pull) -> Self {
+    pub fn new(pin: impl Unborrow<Target = T> + 'd, pull: Pull) -> Self {
         unborrow!(pin);
 
         unsafe {
@@ -91,7 +91,7 @@ pub struct Output<'d, T: Pin> {
 
 impl<'d, T: Pin> Output<'d, T> {
     // TODO opendrain
-    pub fn new(pin: impl PeripheralBorrow<Target = T> + 'd, initial_output: Level) -> Self {
+    pub fn new(pin: impl Unborrow<Target = T> + 'd, initial_output: Level) -> Self {
         unborrow!(pin);
 
         unsafe {
diff --git a/embassy-rp/src/uart.rs b/embassy-rp/src/uart.rs
index 3eb768a7d..2c8986302 100644
--- a/embassy-rp/src/uart.rs
+++ b/embassy-rp/src/uart.rs
@@ -1,6 +1,6 @@
 use core::marker::PhantomData;
 
-use embassy::util::PeripheralBorrow;
+use embassy::util::Unborrow;
 use embassy_extras::unborrow;
 use gpio::Pin;
 
@@ -30,11 +30,11 @@ pub struct Uart<'d, T: Instance> {
 
 impl<'d, T: Instance> Uart<'d, T> {
     pub fn new(
-        inner: impl PeripheralBorrow<Target = T>,
-        tx: impl PeripheralBorrow<Target = impl TxPin<T>>,
-        rx: impl PeripheralBorrow<Target = impl RxPin<T>>,
-        cts: impl PeripheralBorrow<Target = impl CtsPin<T>>,
-        rts: impl PeripheralBorrow<Target = impl RtsPin<T>>,
+        inner: impl Unborrow<Target = T>,
+        tx: impl Unborrow<Target = impl TxPin<T>>,
+        rx: impl Unborrow<Target = impl RxPin<T>>,
+        cts: impl Unborrow<Target = impl CtsPin<T>>,
+        rts: impl Unborrow<Target = impl RtsPin<T>>,
         config: Config,
     ) -> Self {
         unborrow!(inner, tx, rx, cts, rts);
diff --git a/embassy/src/util/mod.rs b/embassy/src/util/mod.rs
index 25b570cc6..cace0d190 100644
--- a/embassy/src/util/mod.rs
+++ b/embassy/src/util/mod.rs
@@ -1,15 +1,16 @@
 //! Async utilities
+mod critical_section;
 mod drop_bomb;
 mod forever;
 mod mutex;
 mod on_drop;
 mod portal;
 mod signal;
-mod critical_section;
 
 #[cfg_attr(feature = "executor-agnostic", path = "waker_agnostic.rs")]
 mod waker;
 
+pub use critical_section::*;
 pub use drop_bomb::*;
 pub use forever::*;
 pub use mutex::*;
@@ -17,9 +18,8 @@ pub use on_drop::*;
 pub use portal::*;
 pub use signal::*;
 pub use waker::*;
-pub use critical_section::*;
 
-pub trait PeripheralBorrow {
+pub trait Unborrow {
     type Target;
     unsafe fn unborrow(self) -> Self::Target;
 }