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pwm: Implement some checks for lowlevel drivers

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There are some expectations which the callbacks provided by lowlevel
drivers should fulfill. Implement checks that help driver authors to get
these semantics right. As these have some overhead the checks can be
disabled using a Kconfig setting.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Uwe Kleine-König 2020-02-10 22:35:18 +01:00 • committed by Thierry Reding
parent 2cb5cd90f4
commit 3ad1f3a332
3 changed files with 140 additions and 8 deletions
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4
include/linux/pwm.h
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@ -71,7 +71,8 @@ struct pwm_state {
* @chip: PWM chip providing this PWM device
* @chip_data: chip-private data associated with the PWM device
* @args: PWM arguments
* @state: curent PWM channel state
* @state: last applied state
* @last: last implemented state (for PWM_DEBUG)
*/
struct pwm_device {
const char *label;
@ -83,6 +84,7 @@ struct pwm_device {
struct pwm_args args;
struct pwm_state state;
struct pwm_state last;
};
/**