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soc: arm: nxp: switch imxrt boards to use systick timer unless CONFIG_PM=y

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Switch all imxrt boards to use the systick timer by default, and only
enable the GPT timer when using low power modes. This is desirable
because the systick has a higher resolution, but the GPT can run
while the core clock is gated, making it useful for low power modes.

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>
This commit is contained in:
Daniel DeGrasse 2022-12-13 14:53:11 -06:00 • committed by Carles Cufí
commit 4be1fb81ce
15 changed files with 88 additions and 22 deletions
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9
boards/arm/mimxrt1020_evk/mimxrt1020_evk.dts
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@ -207,9 +207,14 @@ zephyr_udc0: &usb1 {
status = "okay";
};
/* Enable GPT for use as a hardware timer. This disables Cortex Systick.
* to use systick, change this node from "gpt_hw_timer" to "systick"
/* GPT and Systick are enabled. If power management is enabled, the GPT
* timer will be used instead of systick, as allows the core clock to
* be gated.
*/
&gpt_hw_timer {
status = "okay";
};
&systick {
status = "okay";
};