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.
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).
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | https://www.pengutronix.de/ |
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