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pwm: core: Support new usage_power setting in PWM state

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If usage_power is set, the PWM driver is only required to maintain
the power output but has more freedom regarding signal form.

If supported, the signal can be optimized, for example to
improve EMI by phase shifting individual channels.

Signed-off-by: Clemens Gruber <clemens.gruber@pqgruber.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Clemens Gruber
2021-05-07 15:18:42 +02:00
committed by Thierry Reding
parent 98761ce4b9
commit 9e40ee18a1
3 changed files with 16 additions and 1 deletions
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7
include/linux/pwm.h
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@@ -54,12 +54,17 @@ enum {
* @duty_cycle: PWM duty cycle (in nanoseconds)
* @polarity: PWM polarity
* @enabled: PWM enabled status
* @usage_power: If set, the PWM driver is only required to maintain the power
* output but has more freedom regarding signal form.
* If supported, the signal can be optimized, for example to
* improve EMI by phase shifting individual channels.
*/
struct pwm_state {
u64 period;
u64 duty_cycle;
enum pwm_polarity polarity;
bool enabled;
bool usage_power;
};
/**
@@ -188,6 +193,7 @@ static inline void pwm_init_state(const struct pwm_device *pwm,
state->period = args.period;
state->polarity = args.polarity;
state->duty_cycle = 0;
state->usage_power = false;
}
/**
@@ -558,6 +564,7 @@ static inline void pwm_apply_args(struct pwm_device *pwm)
state.enabled = false;
state.polarity = pwm->args.polarity;
state.period = pwm->args.period;
state.usage_power = false;
pwm_apply_state(pwm, &state);
}