linux-kernel - Re: [PATCH] backlight: arcxcnn: devicetree bindings for ArticSand devices

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Date:   Tue, 23 Aug 2016 13:20:57 -0500
From:   Rob Herring <robh@...nel.org>
To:     Olimpiu Dejeu <olimpiu@...ticsand.com>
Cc:     lee.jones@...aro.org, linux-kernel@...r.kernel.org,
        linux-fbdev@...r.kernel.org, devicetree@...r.kernel.org,
        jg1.han@...sung.com
Subject: Re: [PATCH] backlight: arcxcnn: devicetree bindings for ArticSand
 devices

On Mon, Aug 22, 2016 at 03:11:24PM -0400, Olimpiu Dejeu wrote:
> This is the device tree bindings documentation file
> 
> Signed-off-by: Olimpiu Dejeu <olimpiu@...ticsand.com>
> 
> ---
>  .../bindings/video/backlight/arcxcnn.txt           | 29 ++++++++++++++++++++++

Check your directory location. Things have moved.

>  1 file changed, 29 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/video/backlight/arcxcnn.txt
> 
> diff --git a/Documentation/devicetree/bindings/video/backlight/arcxcnn.txt b/Documentation/devicetree/bindings/video/backlight/arcxcnn.txt
> new file mode 100644
> index 0000000..9cd7315
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/video/backlight/arcxcnn.txt
> @@ -0,0 +1,29 @@
> +arcxcnn bindings
> +
> +Required properties:
> +  - compatible: "arc,arcxcnn", "arc,arc2c0608"

One per line please.

Is arcxcnn a specific chip? If not drop it. No wildcards in compatible 
strings.

> +  - reg: I2C slave address (u8)
> +
> +Optional properties:
> +  - bl-name: Backlight device name (string)

Use the common bindings. label?

> +  - init-brt: Initial value of backlight brightness (u32) low 16 bits used

Use common bindings.

> +  - pwm-period: PWM period value. Set only PWM input mode used (u32)
> +  - prg-addr: Register address of ROM area to be updated (u32) low 8 bits used
> +  - prg-val: Register value to be updated (u32) low 8 bits used

What is this for? This should be a specific property or properties to do 
explicit things, not a generic fill registers/rom with magic values.

> +
> +Example:
> +
> +	/* ARC2C0608 */
> +	backlight@30 {
> +		compatible = "arc,arc2c0608";
> +		reg = <0x30>;
> +
> +		init-brt = <123>;
> +
> +		/* LED0+1 string enabled */
> +		prg_06h {
> +			prg-addr = <0x06>;
> +			prg-val = <0x83>;
> +		};
> +
> +	};
> -- 
> 1.9.1
> 
> --
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