linux-kernel - Re: [PATCH v4 13/24] hwmon: pwm-fan: use pwm_get/set_default

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Date:	Mon, 16 Nov 2015 08:00:54 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Thierry Reding <thierry.reding@...il.com>,
	linux-pwm@...r.kernel.org
Cc:	Mike Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>, linux-clk@...r.kernel.org,
	Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Kamil Debski <k.debski@...sung.com>, lm-sensors@...sensors.org,
	Jean Delvare <jdelvare@...e.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org, Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Jacek Anaszewski <j.anaszewski@...sung.com>,
	linux-leds@...r.kernel.org,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Chen-Yu Tsai <wens@...e.org>, linux-sunxi@...glegroups.com,
	Joachim Eastwood <manabian@...il.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Heiko Stuebner <heiko@...ech.de>,
	linux-rockchip@...ts.infradead.org,
	Jingoo Han <jingoohan1@...il.com>,
	Lee Jones <lee.jones@...aro.org>, linux-fbdev@...r.kernel.org,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Julia Lawall <Julia.Lawall@...6.fr>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 13/24] hwmon: pwm-fan: use pwm_get/set_default_xxx()
 helpers where appropriate

On 11/16/2015 12:56 AM, Boris Brezillon wrote:
> pwm_set/get_default_xxx() helpers have been introduced to differentiate
> the default PWM states (those retrieved through DT, PWM lookup table or
> statically assigned by the driver) and the current ones.
> Make use of those helpers where appropriate.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> ---
>   drivers/hwmon/pwm-fan.c | 15 +++++++++------
>   1 file changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
> index 105b964..989d7b4 100644
> --- a/drivers/hwmon/pwm-fan.c
> +++ b/drivers/hwmon/pwm-fan.c
> @@ -47,8 +47,9 @@ static int  __set_pwm(struct pwm_fan_ctx *ctx, unsigned long pwm)
>   	if (ctx->pwm_value == pwm)
>   		goto exit_set_pwm_err;
>
> -	duty = DIV_ROUND_UP(pwm * (pwm_get_period((ctx->pwm)) - 1), MAX_PWM);
> -	ret = pwm_config(ctx->pwm, duty, pwm_get_period((ctx->pwm)));
> +	duty = DIV_ROUND_UP(pwm * (pwm_get_default_period((ctx->pwm)) - 1),
> +			    MAX_PWM);
> +	ret = pwm_config(ctx->pwm, duty, pwm_get_default_period((ctx->pwm)));

Same here - please no unnecessary ( ) [ which were first introduced by
the other patch ].

Guenter

>   	if (ret)
>   		goto exit_set_pwm_err;
>
> @@ -234,10 +235,11 @@ static int pwm_fan_probe(struct platform_device *pdev)
>   	platform_set_drvdata(pdev, ctx);
>
>   	/* Set duty cycle to maximum allowed */
> -	duty_cycle = pwm_get_period((ctx->pwm)) - 1;
> +	duty_cycle = pwm_get_default_period((ctx->pwm)) - 1;
>   	ctx->pwm_value = MAX_PWM;
>
> -	ret = pwm_config(ctx->pwm, duty_cycle, pwm_get_period((ctx->pwm)));
> +	ret = pwm_config(ctx->pwm, duty_cycle,
> +			 pwm_get_default_period((ctx->pwm)));
>   	if (ret) {
>   		dev_err(&pdev->dev, "Failed to configure PWM\n");
>   		return ret;
> @@ -309,9 +311,10 @@ static int pwm_fan_resume(struct device *dev)
>   	if (ctx->pwm_value == 0)
>   		return 0;
>
> -	duty = DIV_ROUND_UP(ctx->pwm_value * (pwm_get_period((ctx->pwm)) - 1),
> +	duty = DIV_ROUND_UP(ctx->pwm_value *
> +			    (pwm_get_default_period((ctx->pwm)) - 1),
>   			    MAX_PWM);
> -	ret = pwm_config(ctx->pwm, duty, pwm_get_period((ctx->pwm)));
> +	ret = pwm_config(ctx->pwm, duty, pwm_get_default_period((ctx->pwm)));
>   	if (ret)
>   		return ret;
>   	return pwm_enable(ctx->pwm);
>

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