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soc: atmel: samx7x: implement main oscillator bypass mode

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Enable support for using an external clock as the main clock.
When bypass mode is enabled, the external crystal oscillator is bypassed,
and the main clock is directly driven by an external clock signal.

Signed-off-by: Perry Hung <perry@mosi.io>
This commit is contained in:
Perry Hung 2025-03-19 15:21:41 -07:00 • committed by Benjamin Cabé
commit 5bbc6eef9f
2 changed files with 15 additions and 1 deletions
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12
soc/atmel/sam/common/Kconfig
View file

@ -32,6 +32,18 @@ config SOC_ATMEL_SAM_EXT_MAINCK
Says n here will use the internal fast RC oscillator running at 12 MHz.
config SOC_ATMEL_SAM_EXT_MAINCK_BYPASS
bool "Use bypass mode for external crystal oscillator"
depends on SOC_ATMEL_SAM_EXT_MAINCK
help
When bypass mode is enabled, the external crystal oscillator is bypassed,
and the main clock is directly driven by an external clock signal.
Says y here if you want to use an external clock signal directly instead
of the crystal oscillator.
Says n here to use the external crystal oscillator normally.
menu "PLL A"
config SOC_ATMEL_SAM_PLLA_MULA

4
soc/atmel/sam/samx7x/soc.c
View file

@ -57,7 +57,9 @@ static ALWAYS_INLINE void clock_init(void)
* this optimization is not deemed
* critical now.
*/
soc_pmc_switch_mainck_to_xtal(false, 0xff);
bool bypass = IS_ENABLED(CONFIG_SOC_ATMEL_SAM_EXT_MAINCK_BYPASS);
soc_pmc_switch_mainck_to_xtal(bypass, 0xff);
}
/*