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pwm: renesas-tpu: Implement .apply() callback

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To eventually get rid of all legacy drivers convert this driver to the
modern world implementing .apply().

As pwm->state might not be updated in tpu_pwm_apply() before calling
tpu_pwm_config(), an additional parameter is needed for tpu_pwm_config()
to not change the implemented logic.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Uwe Kleine-König 2022-04-20 14:12:37 +02:00 committed by Thierry Reding
parent ff4bcd56c0
commit ec00cd5e63
1 changed files with 38 additions and 6 deletions
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44
drivers/pwm/pwm-renesas-tpu.c
View file

@ -242,7 +242,7 @@ static void tpu_pwm_free(struct pwm_chip *chip, struct pwm_device *_pwm)
}
static int tpu_pwm_config(struct pwm_chip *chip, struct pwm_device *_pwm,
int duty_ns, int period_ns)
int duty_ns, int period_ns, bool enabled)
{
static const unsigned int prescalers[] = { 1, 4, 16, 64 };
struct tpu_pwm_device *pwm = pwm_get_chip_data(_pwm);
@ -293,7 +293,7 @@ static int tpu_pwm_config(struct pwm_chip *chip, struct pwm_device *_pwm,
pwm->duty = duty;
/* If the channel is disabled we're done. */
if (!pwm_is_enabled(_pwm))
if (!enabled)
return 0;
if (duty_only && pwm->timer_on) {
@ -366,13 +366,45 @@ static void tpu_pwm_disable(struct pwm_chip *chip, struct pwm_device *_pwm)
tpu_pwm_timer_stop(pwm);
}
static int tpu_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
const struct pwm_state *state)
{
int err;
bool enabled = pwm->state.enabled;
if (state->polarity != pwm->state.polarity) {
if (enabled) {
tpu_pwm_disable(chip, pwm);
enabled = false;
}
err = tpu_pwm_set_polarity(chip, pwm, state->polarity);
if (err)
return err;
}
if (!state->enabled) {
if (enabled)
tpu_pwm_disable(chip, pwm);
return 0;
}
err = tpu_pwm_config(pwm->chip, pwm,
state->duty_cycle, state->period, enabled);
if (err)
return err;
if (!enabled)
err = tpu_pwm_enable(chip, pwm);
return err;
}
static const struct pwm_ops tpu_pwm_ops = {
.request = tpu_pwm_request,
.free = tpu_pwm_free,
.config = tpu_pwm_config,
.set_polarity = tpu_pwm_set_polarity,
.enable = tpu_pwm_enable,
.disable = tpu_pwm_disable,
.apply = tpu_pwm_apply,
.owner = THIS_MODULE,
};