linux-kernel - Re: [PATCH] drivers: video: fbdev: atmel_lcdfb.c: Add ability to inverted backlight PWM.

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Date:	Fri, 4 Jul 2014 15:28:52 +0200
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	Michael Welling <mwelling@...e.org>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-fbdev@...r.kernel.org>,
	Tomi Valkeinen <tomi.valkeinen@...com>
Subject: Re: [PATCH] drivers: video: fbdev: atmel_lcdfb.c: Add ability to
 inverted backlight PWM.

On 04/07/2014 04:26, Michael Welling :
> The code has a variable to change the polarity of the PWM backlight control but
> it was not being initialized. This patch adds a devicetree entry to set the
> variable if required.
> 
> Signed-off-by: Michael Welling <mwelling@...e.org>

Seems good


Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>


> ---
>  .../devicetree/bindings/video/atmel,lcdc.txt       |    1 +
>  drivers/video/fbdev/atmel_lcdfb.c                  |    3 ++-
>  2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/video/atmel,lcdc.txt b/Documentation/devicetree/bindings/video/atmel,lcdc.txt
> index 1ec175e..b75af94 100644
> --- a/Documentation/devicetree/bindings/video/atmel,lcdc.txt
> +++ b/Documentation/devicetree/bindings/video/atmel,lcdc.txt
> @@ -46,6 +46,7 @@ Required properties (as per of_videomode_helper):
>  
>  Optional properties (as per of_videomode_helper):
>   - atmel,lcdcon-backlight: enable backlight
> + - atmel,lcdcon-backlight-inverted: invert backlight PWM polarity
>   - atmel,lcd-wiring-mode: lcd wiring mode "RGB" or "BRG"
>   - atmel,power-control-gpio: gpio to power on or off the LCD (as many as needed)
>  
> diff --git a/drivers/video/fbdev/atmel_lcdfb.c b/drivers/video/fbdev/atmel_lcdfb.c
> index d36e830..92640d4 100644
> --- a/drivers/video/fbdev/atmel_lcdfb.c
> +++ b/drivers/video/fbdev/atmel_lcdfb.c
> @@ -290,7 +290,7 @@ static void init_contrast(struct atmel_lcdfb_info *sinfo)
>  
>  	/* contrast pwm can be 'inverted' */
>  	if (pdata->lcdcon_pol_negative)
> -			contrast_ctr &= ~(ATMEL_LCDC_POL_POSITIVE);
> +		contrast_ctr &= ~(ATMEL_LCDC_POL_POSITIVE);
>  
>  	/* have some default contrast/backlight settings */
>  	lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
> @@ -1097,6 +1097,7 @@ static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo)
>  	pdata->lcd_wiring_mode = ret;
>  
>  	pdata->lcdcon_is_backlight = of_property_read_bool(display_np, "atmel,lcdcon-backlight");
> +	pdata->lcdcon_pol_negative = of_property_read_bool(display_np, "atmel,lcdcon-backlight-inverted");
>  
>  	timings = of_get_display_timings(display_np);
>  	if (!timings) {
> 


-- 
Nicolas Ferre
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