From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tomasz Figa <tomasz.figa@gmail.com>
Subject: Re: [PATCH] ARM: dts: enable pwm backlight on exynos5250-snow
Date: Wed, 07 May 2014 22:34:47 +0200
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References: <1399467371-12242-1-git-send-email-ajaykumar.rs@samsung.com>
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To: Ajay Kumar <ajaykumar.rs@samsung.com>, linux-samsung-soc@vger.kernel.org
Cc: ajaynumb@gmail.com, kgene.kim@samsung.com, joshi@samsung.com, prashanth.g@samsung.com, Olof Johansson <olof@lixom.net>

Hi Ajay,

On 07.05.2014 14:56, Ajay Kumar wrote:
> Add PWM backlight node for exynos5250 and enable the same on exynos5250
> based snow board.
>
> Signed-off-by: Olof Johansson <olof@lixom.net>
> Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com>
> ---
>   arch/arm/boot/dts/exynos5250-pinctrl.dtsi |    7 +++++++
>   arch/arm/boot/dts/exynos5250-snow.dts     |    5 +++++
>   arch/arm/boot/dts/exynos5250.dtsi         |   10 ++++++++++
>   3 files changed, 22 insertions(+)
>
> diff --git a/arch/arm/boot/dts/exynos5250-pinctrl.dtsi b/arch/arm/boot/dts/exynos5250-pinctrl.dtsi
> index 9a49e68..2a4680c 100644
> --- a/arch/arm/boot/dts/exynos5250-pinctrl.dtsi
> +++ b/arch/arm/boot/dts/exynos5250-pinctrl.dtsi
> @@ -351,6 +351,13 @@
>   			samsung,pin-drv = <0>;
>   		};
>
> +		backlight_pwm: backlight-pwm {
> +			samsung,pins = "gpb2-0";
> +			samsung,pin-function = <2>;
> +			samsung,pin-pud = <0>;
> +			samsung,pin-drv = <0>;
> +		};

This looks like a generic PWM output function, not specific to backlight 
in any way.

Please see patch [1] adding PWM output pin groups for Exynos5420 for 
reference.

[1] 
https://www.mail-archive.com/linux-samsung-soc@vger.kernel.org/msg29869.html

Best regards,
Tomasz