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pwm: samsung: Implement .apply() callback

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

The size check for state->period is moved to .apply() to make sure that
the values of state->duty_cycle and state->period are passed to
pwm_samsung_config without change while they are discarded to int.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Uwe Kleine-König 2022-03-28 09:34:34 +02:00 committed by Thierry Reding
parent 762c4e7fce
commit daa986d5f8
1 changed files with 42 additions and 12 deletions
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54
drivers/pwm/pwm-samsung.c
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@ -321,14 +321,6 @@ static int __pwm_samsung_config(struct pwm_chip *chip, struct pwm_device *pwm,
struct samsung_pwm_channel *chan = pwm_get_chip_data(pwm);
u32 tin_ns = chan->tin_ns, tcnt, tcmp, oldtcmp;
/*
* We currently avoid using 64bit arithmetic by using the
* fact that anything faster than 1Hz is easily representable
* by 32bits.
*/
if (period_ns > NSEC_PER_SEC)
return -ERANGE;
tcnt = readl(our_chip->base + REG_TCNTB(pwm->hwpwm));
oldtcmp = readl(our_chip->base + REG_TCMPB(pwm->hwpwm));
@ -438,13 +430,51 @@ static int pwm_samsung_set_polarity(struct pwm_chip *chip,
return 0;
}
static int pwm_samsung_apply(struct pwm_chip *chip, struct pwm_device *pwm,
const struct pwm_state *state)
{
int err, enabled = pwm->state.enabled;
if (state->polarity != pwm->state.polarity) {
if (enabled) {
pwm_samsung_disable(chip, pwm);
enabled = false;
}
err = pwm_samsung_set_polarity(chip, pwm, state->polarity);
if (err)
return err;
}
if (!state->enabled) {
if (enabled)
pwm_samsung_disable(chip, pwm);
return 0;
}
/*
* We currently avoid using 64bit arithmetic by using the
* fact that anything faster than 1Hz is easily representable
* by 32bits.
*/
if (state->period > NSEC_PER_SEC)
return -ERANGE;
err = pwm_samsung_config(chip, pwm, state->duty_cycle, state->period);
if (err)
return err;
if (!pwm->state.enabled)
err = pwm_samsung_enable(chip, pwm);
return err;
}
static const struct pwm_ops pwm_samsung_ops = {
.request = pwm_samsung_request,
.free = pwm_samsung_free,
.enable = pwm_samsung_enable,
.disable = pwm_samsung_disable,
.config = pwm_samsung_config,
.set_polarity = pwm_samsung_set_polarity,
.apply = pwm_samsung_apply,
.owner = THIS_MODULE,
};