在 2022/2/10 18:03, Uwe Kleine-König 写道:
On Thu, Feb 10, 2022 at 05:05:02PM +0800, Song Chen wrote:Introduce apply in pwm_ops to replace legacy operations, like enable, disable, config and set_polarity. Signed-off-by: Song Chen <chensong_2000@xxxxxx> --- drivers/staging/greybus/pwm.c | 46 +++++++++++++++-------------------- 1 file changed, 19 insertions(+), 27 deletions(-) diff --git a/drivers/staging/greybus/pwm.c b/drivers/staging/greybus/pwm.c index 891a6a672378..e1889cf979b2 100644 --- a/drivers/staging/greybus/pwm.c +++ b/drivers/staging/greybus/pwm.c @@ -204,43 +204,35 @@ static void gb_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) gb_pwm_deactivate_operation(pwmc, pwm->hwpwm); }-static int gb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,- int duty_ns, int period_ns) -{ - struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip); - - return gb_pwm_config_operation(pwmc, pwm->hwpwm, duty_ns, period_ns); -}; - -static int gb_pwm_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm, - enum pwm_polarity polarity) +static int gb_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, + const struct pwm_state *state) { + int ret; struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);- return gb_pwm_set_polarity_operation(pwmc, pwm->hwpwm, polarity);-}; - -static int gb_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) -{ - struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip); + /* set period and duty cycle*/ + ret = gb_pwm_config_operation(pwmc, pwm->hwpwm, state->duty_cycle, state->period);gb_pwm_config_operation's 3rd parameter is an u32, so you're loosing bits here as state->duty_cycle is a u64. Ditto for period.
originally, pwm_apply_state --> pwm_apply_legacy --> gb_pwm_config --> gb_pwm_config_operation is also loosing bits, does it mean greybus can live with that?
Or redefine gb_pwm_config_request, switch duty and period to __le64?
Also it would be nice if you go from .duty_cycle = A, .period = B, .enabled = 1 to .duty_cycle = C, .period = D, .enabled = 0 that C/D wasn't visible on the output pin. So please disable earlier (but keep enable at the end).
sorry, i don't quite understand this part, but is below code looking good to you?
static int gb_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
const struct pwm_state *state)
{
int err;
bool enabled = pwm->state.enabled;
struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip);
/* set polarity */
if (state->polarity != pwm->state.polarity) {
if (enabled) {
gb_pwm_disable_operation(pwmc, pwm->hwpwm);
enabled = false;
}
err = gb_pwm_set_polarity_operation(pwmc, pwm->hwpwm, state->polarity);
if (err)
return err;
}
if (!state->enabled) {
if (enabled)
gb_pwm_disable_operation(pwmc, pwm->hwpwm);
return 0;
}
/* set period and duty cycle*/
err = gb_pwm_config_operation(pwmc, pwm->hwpwm, state->duty_cycle,
state->period);
if (err) return err; /* enable/disable */ if (!enabled) return gb_pwm_enable_operation(pwmc, pwm->hwpwm); return 0; }
Best regards Uwe
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