linux-kernel - Re: [PATCH v3 05/10] pwm: add PWM mode to pwm

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Message-ID: <20180222130131.46fcuurp4h6dc7wb@gofer.mess.org>
Date:   Thu, 22 Feb 2018 13:01:31 +0000
From:   Sean Young <sean@...s.org>
To:     Claudiu Beznea <claudiu.beznea@...rochip.com>
Cc:     thierry.reding@...il.com, shc_work@...l.ru, kgene@...nel.org,
        krzk@...nel.org, linux@...linux.org.uk, mturquette@...libre.com,
        sboyd@...eaurora.org, jani.nikula@...ux.intel.com,
        joonas.lahtinen@...ux.intel.com, rodrigo.vivi@...el.com,
        airlied@...ux.ie, kamil@...as.org, b.zolnierkie@...sung.com,
        jdelvare@...e.com, linux@...ck-us.net, dmitry.torokhov@...il.com,
        rpurdie@...ys.net, jacek.anaszewski@...il.com, pavel@....cz,
        mchehab@...nel.org, lee.jones@...aro.org,
        daniel.thompson@...aro.org, jingoohan1@...il.com, milo.kim@...com,
        robh+dt@...nel.org, mark.rutland@....com, corbet@....net,
        nicolas.ferre@...rochip.com, alexandre.belloni@...e-electrons.com,
        linux-pwm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-hwmon@...r.kernel.org, linux-input@...r.kernel.org,
        linux-leds@...r.kernel.org, linux-media@...r.kernel.org,
        linux-fbdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH v3 05/10] pwm: add PWM mode to pwm_config()

On Thu, Feb 22, 2018 at 02:01:16PM +0200, Claudiu Beznea wrote:
> Add PWM mode to pwm_config() function. The drivers which uses pwm_config()
> were adapted to this change.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
> ---

-snip-

> diff --git a/drivers/media/rc/ir-rx51.c b/drivers/media/rc/ir-rx51.c
> index 49265f02e772..a971b02ea021 100644
> --- a/drivers/media/rc/ir-rx51.c
> +++ b/drivers/media/rc/ir-rx51.c
> @@ -55,10 +55,13 @@ static int init_timing_params(struct ir_rx51 *ir_rx51)
>  {
>  	struct pwm_device *pwm = ir_rx51->pwm;
>  	int duty, period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, ir_rx51->freq);
> +	struct pwm_caps caps = { };
>  
>  	duty = DIV_ROUND_CLOSEST(ir_rx51->duty_cycle * period, 100);
>  
> -	pwm_config(pwm, duty, period);
> +	pwm_get_caps(pwm->chip, pwm, &caps);
> +
> +	pwm_config(pwm, duty, period, BIT(ffs(caps.modes) - 1));
>  
>  	return 0;
>  }
> diff --git a/drivers/media/rc/pwm-ir-tx.c b/drivers/media/rc/pwm-ir-tx.c
> index 27d0f5837a76..c630e1b450a3 100644
> --- a/drivers/media/rc/pwm-ir-tx.c
> +++ b/drivers/media/rc/pwm-ir-tx.c
> @@ -61,6 +61,7 @@ static int pwm_ir_tx(struct rc_dev *dev, unsigned int *txbuf,
>  {
>  	struct pwm_ir *pwm_ir = dev->priv;
>  	struct pwm_device *pwm = pwm_ir->pwm;
> +	struct pwm_caps caps = { };
>  	int i, duty, period;
>  	ktime_t edge;
>  	long delta;
> @@ -68,7 +69,9 @@ static int pwm_ir_tx(struct rc_dev *dev, unsigned int *txbuf,
>  	period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, pwm_ir->carrier);
>  	duty = DIV_ROUND_CLOSEST(pwm_ir->duty_cycle * period, 100);
>  
> -	pwm_config(pwm, duty, period);
> +	pwm_get_caps(pwm->chip, pwm, &caps);
> +
> +	pwm_config(pwm, duty, period, BIT(ffs(caps.modes) - 1));
>  
>  	edge = ktime_get();
>  

The two PWM rc-core drivers need PWM_MODE(NORMAL), not the first available
mode that the device supports. If mode normal is not supported, then probe
should fail.


Sean