linux-kernel - Re: [PATCH 2/2 v2] backlight: gpio: delete pdata inversion

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Message-ID: <1973469.qbbesreyky@avalon>
Date:   Tue, 01 Aug 2017 13:28:53 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2 v2] backlight: gpio: delete pdata inversion

Hi Linus,

Thank you for the patch.

On Tuesday 30 May 2017 13:48:22 Linus Walleij wrote:
> The option to invert the output of the GPIO (active low) is
> not used by the only platform still using platform data to
> set up a GPIO backlight (one SH board). Delete the option
> as we do not expect to expand the use of board files for
> this driver, and GPIO descriptors intrinsically keep track
> of any signal inversion.
> 
> Acked-by: Daniel Thompson <daniel.thompson@...aro.org>
> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
> ChangeLog v1->v2:
> - Rebase on the v2 of patch [1/2]
> ---
>  drivers/video/backlight/gpio_backlight.c     | 15 ++-------------
>  include/linux/platform_data/gpio_backlight.h |  1 -
>  2 files changed, 2 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/video/backlight/gpio_backlight.c
> b/drivers/video/backlight/gpio_backlight.c index 5ffaff1e4142..e470da95d806
> 100644
> --- a/drivers/video/backlight/gpio_backlight.c
> +++ b/drivers/video/backlight/gpio_backlight.c
> @@ -25,7 +25,6 @@ struct gpio_backlight {
>  	struct device *fbdev;
> 
>  	struct gpio_desc *gpiod;
> -	int active;
>  	int def_value;
>  };
> 
> @@ -39,8 +38,7 @@ static int gpio_backlight_update_status(struct
> backlight_device *bl) bl->props.state & (BL_CORE_SUSPENDED |
> BL_CORE_FBBLANK))
>  		brightness = 0;
> 
> -	gpiod_set_value_cansleep(gbl->gpiod,
> -				 brightness ? gbl->active : !gbl->active);
> +	gpiod_set_value_cansleep(gbl->gpiod, brightness);
> 
>  	return 0;
>  }
> @@ -69,8 +67,6 @@ static int gpio_backlight_probe_dt(struct platform_device
> *pdev,
> 
>  	gbl->def_value = of_property_read_bool(np, "default-on");
>  	flags = gbl->def_value ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
> -	/* GPIO descriptors keep track of inversion */
> -	gbl->active = 1;
> 
>  	gbl->gpiod = devm_gpiod_get(dev, NULL, flags);
>  	if (IS_ERR(gbl->gpiod)) {
> @@ -121,15 +117,8 @@ static int gpio_backlight_probe(struct platform_device
> *pdev) unsigned long flags = GPIOF_DIR_OUT;
> 
>  		gbl->fbdev = pdata->fbdev;
> -		gbl->active = pdata->active_low ? 0 : 1;
>  		gbl->def_value = pdata->def_value;
> -
> -		if (gbl->active)
> -			flags |= gbl->def_value ?
> -				GPIOF_INIT_HIGH : GPIOF_INIT_LOW;
> -		else
> -			flags |= gbl->def_value ?
> -				GPIOF_INIT_LOW : GPIOF_INIT_HIGH;
> +		flags |= gbl->def_value ? GPIOF_INIT_HIGH : GPIOF_INIT_LOW;
> 
>  		ret = devm_gpio_request_one(gbl->dev, pdata->gpio, flags,
>  					    pdata ? pdata->name : 
"backlight");
> diff --git a/include/linux/platform_data/gpio_backlight.h
> b/include/linux/platform_data/gpio_backlight.h index
> 5ae0d9c80d4d..683d90453c41 100644
> --- a/include/linux/platform_data/gpio_backlight.h
> +++ b/include/linux/platform_data/gpio_backlight.h
> @@ -14,7 +14,6 @@ struct gpio_backlight_platform_data {
>  	struct device *fbdev;
>  	int gpio;
>  	int def_value;
> -	bool active_low;
>  	const char *name;
>  };

-- 
Regards,

Laurent Pinchart