pwm: rcar: Add support "atomic" API

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This patch adds support for "atomic" API. This behavior differs with
legacy APIs a little.

 Legacy APIs:
  The PWMCNT register will be updated in rcar_pwm_config() even if
  the PWM state is disabled.

 Atomic API:
  The PWMCNT register will be updated in rcar_pwm_apply() only if
  the PWM state is enabled. Otherwize, if a PWM runs with 30% duty
  cycles and the pwm_apply_state() is called with state->enabled = 0,
  ->duty_cycle = 60 and ->period = 100, this is possible to output
  a 60% duty cycle.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

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Yoshihiro Shimoda 2019-01-09 17:19:05 +09:00 • committed by Thierry Reding

parent 74d0c3b205

commit 7f68ce8287

1 changed files with 37 additions and 0 deletions

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drivers/pwm/pwm-rcar.c

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