diff options
| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2021-05-04 15:25:36 +0200 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2021-06-30 19:12:18 +0200 |
| commit | 30dffb42fcd4b127474f089e9c03fbc0dfc649a8 (patch) | |
| tree | 749eec796eb5478f1e72305dec596b3835f95f73 /drivers/pwm | |
| parent | 3f3e805177afc04dccf43cc58856a14a000a593f (diff) | |
| download | linux-30dffb42fcd4b127474f089e9c03fbc0dfc649a8.tar.bz2 | |
pwm: berlin: Implement .apply() callback
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>
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/pwm-berlin.c | 43 |
1 files changed, 38 insertions, 5 deletions
diff --git a/drivers/pwm/pwm-berlin.c b/drivers/pwm/pwm-berlin.c index 7eddc21ff77b..c17d7e8f0470 100644 --- a/drivers/pwm/pwm-berlin.c +++ b/drivers/pwm/pwm-berlin.c @@ -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, }; |