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pwm: Introduce the pwm_args concept

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Currently the PWM core mixes the current PWM state with the per-platform
reference config (specified through the PWM lookup table, DT definition
or directly hardcoded in PWM drivers).

Create a struct pwm_args to store this reference configuration, so that
PWM users can differentiate between the current and reference
configurations.

Patch all places where pwm->args should be initialized. We keep the
pwm_set_polarity/period() calls until all PWM users are patched to use
pwm_args instead of pwm_get_period/polarity().

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
[thierry.reding@gmail.com: reword kerneldoc comments]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Boris Brezillon
2016-04-14 21:17:21 +02:00
committed by Thierry Reding
parent f55532a0c0
commit e39c0df1be
4 changed files with 49 additions and 9 deletions
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2
drivers/pwm/pwm-pxa.c
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@@ -160,7 +160,7 @@ pxa_pwm_of_xlate(struct pwm_chip *pc, const struct of_phandle_args *args)
if (IS_ERR(pwm))
return pwm;
pwm_set_period(pwm, args->args[0]);
pwm->args.period = args->args[0];
return pwm;
}