linux-kernel - Re: [PATCH 9/9] backlight: atmel-pwm-bl: use gpio_request

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Date:	Fri, 25 Oct 2013 13:15:43 +0200
From:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To:	Johan Hovold <jhovold@...il.com>
Cc:	Richard Purdie <rpurdie@...ys.net>,
	Jingoo Han <jg1.han@...sung.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 9/9] backlight: atmel-pwm-bl: use gpio_request_one

On 11:55 Wed 23 Oct     , Johan Hovold wrote:
> Use devm_gpio_request_one rather than requesting and setting direction
> in two calls.

this is the same I do not see any advantage

and as I said for ather backligth It's wrong to enable or disable it at probe
as the bootloader might have already enable it for splash screen

Best Regards,
J.
> 
> Acked-by: Jingoo Han <jg1.han@...sung.com>:w
> Signed-off-by: Johan Hovold <jhovold@...il.com>
> ---
>  drivers/video/backlight/atmel-pwm-bl.c | 15 ++++++++-------
>  1 file changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/video/backlight/atmel-pwm-bl.c b/drivers/video/backlight/atmel-pwm-bl.c
> index 1277e0c..5ea2517 100644
> --- a/drivers/video/backlight/atmel-pwm-bl.c
> +++ b/drivers/video/backlight/atmel-pwm-bl.c
> @@ -124,6 +124,7 @@ static int atmel_pwm_bl_probe(struct platform_device *pdev)
>  	const struct atmel_pwm_bl_platform_data *pdata;
>  	struct backlight_device *bldev;
>  	struct atmel_pwm_bl *pwmbl;
> +	int flags;
>  	int retval;
>  
>  	pdata = dev_get_platdata(&pdev->dev);
> @@ -149,14 +150,14 @@ static int atmel_pwm_bl_probe(struct platform_device *pdev)
>  		return retval;
>  
>  	if (gpio_is_valid(pwmbl->gpio_on)) {
> -		retval = devm_gpio_request(&pdev->dev, pwmbl->gpio_on,
> -					"gpio_atmel_pwm_bl");
> -		if (retval)
> -			goto err_free_pwm;
> -
>  		/* Turn display off by default. */
> -		retval = gpio_direction_output(pwmbl->gpio_on,
> -				0 ^ pdata->on_active_low);
> +		if (pdata->on_active_low)
> +			flags = GPIOF_OUT_INIT_HIGH;
> +		else
> +			flags = GPIOF_OUT_INIT_LOW;
> +
> +		retval = devm_gpio_request_one(&pdev->dev, pwmbl->gpio_on,
> +						flags, "gpio_atmel_pwm_bl");
>  		if (retval)
>  			goto err_free_pwm;
>  	}
> -- 
> 1.8.4
> 
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