linux-kernel - Re: [PATCH v3 resend2] s3c/s3c24xx: arm: leds: Make s3c24xx LEDS driver use gpiolib

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Date:	Tue, 13 Dec 2011 13:28:52 -0800
From:	Joe Perches <joe@...ches.com>
To:	Denis Kuzmenko <linux@...onet.org.ua>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	Grant Likely <grant.likely@...retlab.ca>,
	Linus Walleij <linus.walleij@...aro.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Richard Purdie <rpurdie@...ys.net>
Subject: Re: [PATCH v3 resend2] s3c/s3c24xx: arm: leds: Make s3c24xx LEDS
 driver use gpiolib

On Tue, 2011-12-13 at 23:21 +0200, Denis Kuzmenko wrote:
> Hi Joe,
> Thank you for review.
> 
> On 12/13/2011 11:06 PM, Joe Perches wrote:
> > On Tue, 2011-12-13 at 22:22 +0200, Denis Kuzmenko wrote:
> >> Make s3c24xx LEDS driver use gpiolib. Fix error disabling pull during probe.
> > []
> >> diff --git a/drivers/leds/leds-s3c24xx.c b/drivers/leds/leds-s3c24xx.c
> > []
> >> @@ -45,23 +45,35 @@ static void s3c24xx_led_set(struct led_classdev *led_cdev,
> >> +	/*
> >> +	 * ensure value is 0 or 1 to use it with bitwise XOR (^)
> >> +	 * (only 100% brightness is supported)
> >> +	 */
> >> +	value = value ? 1 : 0;
> > 
> > Maybe value = !!value;
> 
> IMHO my variant is better readable.
> 
> >> +		/* no point in having a pull-up as we are always driving */
> >> +		s3c_gpio_setpull(pdata->gpio, S3C_GPIO_PULL_NONE);
> >> +		ret = gpio_direction_output(pdata->gpio,
> >> +				!!(pdata->flags & S3C24XX_LEDF_ACTLOW));
> > 
> > akin to this use.
> 
> There is no so much space for implementation used before so I've used
> shorter notation, again, for better readability.

Your choice, but I think consistency is better.

The LEDF_ACTLOW use is dependent on it being #defined
to 1 when using ^.  I think that's unintelligible.

cheers, Joe

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