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| author | Vincent Palatin <vpalatin@chromium.org> | 2020-11-09 10:26:35 +0100 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2020-12-02 09:38:56 +0000 |
| commit | 696492499f433806a26b4cb0733026444e698c35 (patch) | |
| tree | bf5ae3e76b9fb94d538d66c0f93aaf026b05e510 | |
| parent | 418d2e8e40b2a9d1530e18e620dc0a41154f713b (diff) | |
| download | chrome-ec-696492499f433806a26b4cb0733026444e698c35.tar.gz | |
stm32: update the timer pre-scaler on STM32F4
Add support for changing for the timer source clock frequency on
STM32F4 by re-computing the timer pre-scaler value in the
HOOK_FREQ_CHANGE callback.
Preparatory work to implement power management switching between PLL and
HSI as sysclk.
Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
BUG=b:130561737
TEST=manual, verify the output of the 'gettime' console command against
the wall clock.
BRANCH=fpmcu-bloonchipper
Change-Id: Ia7dc24d3b1dbff816b1cebbc87492e678b987dfd
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2527048
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
| -rw-r--r-- | chip/stm32/hwtimer32.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/chip/stm32/hwtimer32.c b/chip/stm32/hwtimer32.c index 12057ad762..a643ccc134 100644 --- a/chip/stm32/hwtimer32.c +++ b/chip/stm32/hwtimer32.c @@ -142,7 +142,7 @@ defined(CHIP_FAMILY_STM32H7) } #if defined(CHIP_FAMILY_STM32L) || defined(CHIP_FAMILY_STM32L4) || \ - defined(CHIP_FAMILY_STM32H7) + defined(CHIP_FAMILY_STM32F4) || defined(CHIP_FAMILY_STM32H7) /* for families using a variable clock feeding the timer */ static void update_prescaler(void) { @@ -183,7 +183,8 @@ static void update_prescaler(void) #endif /* CONFIG_WATCHDOG_HELP */ } DECLARE_HOOK(HOOK_FREQ_CHANGE, update_prescaler, HOOK_PRIO_DEFAULT); -#endif /* CHIP_FAMILY_STM32L || CHIP_FAMILY_STM32L4 || CHIP_FAMILY_STM32H7 */ +#endif /* CHIP_FAMILY_STM32L || CHIP_FAMILY_STM32L4 || */ + /* CHIP_FAMILY_STM32F4 || CHIP_FAMILY_STM32H7 */ int __hw_clock_source_init(uint32_t start_t) { |