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pwm: berlin: Implement .apply() callback

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To eventually get rid of all legacy drivers convert this driver to the
modern world implementing .apply(). This just pushes down a slightly
optimized variant of how legacy drivers are handled in the core.

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 2021-05-04 15:25:36 +02:00 committed by Thierry Reding
parent 3f3e805177
commit 30dffb42fc
1 changed files with 38 additions and 5 deletions
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43
drivers/pwm/pwm-berlin.c
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@ -88,7 +88,7 @@ static void berlin_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
}
static int berlin_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_ns, int period_ns)
u64 duty_ns, u64 period_ns)
{
struct berlin_pwm_chip *bpc = to_berlin_pwm_chip(chip);
bool prescale_4096 = false;
@ -167,13 +167,46 @@ static void berlin_pwm_disable(struct pwm_chip *chip,
berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_EN);
}
static int berlin_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) {
berlin_pwm_disable(chip, pwm);
enabled = false;
}
err = berlin_pwm_set_polarity(chip, pwm, state->polarity);
if (err)
return err;
}
if (!state->enabled) {
if (enabled)
berlin_pwm_disable(chip, pwm);
return 0;
}
if (state->period != pwm->state.period ||
state->duty_cycle != pwm->state.duty_cycle) {
err = berlin_pwm_config(chip, pwm, state->duty_cycle, state->period);
if (err)
return err;
}
if (!enabled)
return berlin_pwm_enable(chip, pwm);
return 0;
}
static const struct pwm_ops berlin_pwm_ops = {
.request = berlin_pwm_request,
.free = berlin_pwm_free,
.config = berlin_pwm_config,
.set_polarity = berlin_pwm_set_polarity,
.enable = berlin_pwm_enable,
.disable = berlin_pwm_disable,
.apply = berlin_pwm_apply,
.owner = THIS_MODULE,
};