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pwm: tiehrpwm: 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 2021-11-30 21:19:37 +01:00 committed by Thierry Reding
parent 6b94ee669e
commit 5f027d9b83
1 changed files with 35 additions and 5 deletions
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40
drivers/pwm/pwm-tiehrpwm.c
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@ -216,7 +216,7 @@ static void configure_polarity(struct ehrpwm_pwm_chip *pc, int chan)
* duty_ns = 10^9 * (ps_divval * duty_cycles) / PWM_CLK_RATE
*/
static int ehrpwm_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_ns, int period_ns)
u64 duty_ns, u64 period_ns)
{
struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
u32 period_cycles, duty_cycles;
@ -401,12 +401,42 @@ static void ehrpwm_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
pc->period_cycles[pwm->hwpwm] = 0;
}
static int ehrpwm_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) {
ehrpwm_pwm_disable(chip, pwm);
enabled = false;
}
err = ehrpwm_pwm_set_polarity(chip, pwm, state->polarity);
if (err)
return err;
}
if (!state->enabled) {
if (enabled)
ehrpwm_pwm_disable(chip, pwm);
return 0;
}
err = ehrpwm_pwm_config(chip, pwm, state->duty_cycle, state->period);
if (err)
return err;
if (!enabled)
err = ehrpwm_pwm_enable(chip, pwm);
return err;
}
static const struct pwm_ops ehrpwm_pwm_ops = {
.free = ehrpwm_pwm_free,
.config = ehrpwm_pwm_config,
.set_polarity = ehrpwm_pwm_set_polarity,
.enable = ehrpwm_pwm_enable,
.disable = ehrpwm_pwm_disable,
.apply = ehrpwm_pwm_apply,
.owner = THIS_MODULE,
};