1 files changed, 30 insertions, 0 deletions

diff --git a/embassy-nrf/src/lib.rs b/embassy-nrf/src/lib.rs
index 530964107..bc386e820 100644
--- a/embassy-nrf/src/lib.rs
+++ b/embassy-nrf/src/lib.rs
@@ -285,6 +285,15 @@ pub use crate::pac::NVIC_PRIO_BITS;
 pub mod config {
     //! Configuration options used when initializing the HAL.
 
+    /// Clock speed
+    #[cfg(feature = "_nrf54l")]
+    pub enum ClockSpeed {
+        /// Run at 128 MHz.
+        CK128,
+        /// Run at 64 MHz.
+        CK64,
+    }
+
     /// High frequency clock source.
     pub enum HfclkSource {
         /// Internal source
@@ -554,6 +563,8 @@ pub mod config {
         pub time_interrupt_priority: crate::interrupt::Priority,
         /// Enable or disable the debug port.
         pub debug: Debug,
+        #[cfg(feature = "_nrf54l")]
+        pub clock_speed: ClockSpeed,
     }
 
     impl Default for Config {
@@ -594,6 +605,8 @@ pub mod config {
                 debug: Debug::NotConfigured,
                 #[cfg(not(feature = "_ns"))]
                 debug: Debug::Allowed,
+                #[cfg(feature = "_nrf54l")]
+                clock_speed: ClockSpeed::CK64,
             }
         }
     }
@@ -700,6 +713,23 @@ pub fn init(config: config::Config) -> Peripherals {
     #[allow(unused_mut)]
     let mut needs_reset = false;
 
+    // set clock speed
+    #[cfg(feature = "_nrf54l")]
+    {
+        #[cfg(feature = "_s")]
+        let regs = pac::OSCILLATORS_S;
+        #[cfg(feature = "_ns")]
+        let regs = pac::OSCILLATORS_NS;
+
+        use pac::oscillators::vals::Freq;
+        regs.pll().freq().write(|w| {
+            w.set_freq(match config.clock_speed {
+                config::ClockSpeed::CK64 => Freq::CK64M,
+                config::ClockSpeed::CK128 => Freq::CK128M,
+            });
+        });
+    }
+
     // Workaround used in the nrf mdk: file system_nrf91.c , function SystemInit(), after `#if !defined(NRF_SKIP_UICR_HFXO_WORKAROUND)`
     #[cfg(all(feature = "_nrf91", feature = "_s"))]
     {