linux-kernel - Re: [PATCH 2/2] backlight: arcxcnn: devicetree bindings for ArticSand devices

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Date:   Thu, 29 Sep 2016 20:21:12 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Olimpiu Dejeu <olimpiu@...ticsand.com>
Cc:     robh@...nel.org, 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 2/2] backlight: arcxcnn: devicetree bindings for
 ArticSand devices

On Thu, Sep 29, 2016 at 12:35:37PM -0400, Olimpiu Dejeu wrote:
> Resubmition of arcxcnn backliught driver bindings correcting the file 
>  location, device name, and proper use of reg for device address
> 
> Signed-off-by: Olimpiu Dejeu <olimpiu@...ticsand.com>
> 
> ---
>  .../bindings/leds/backlight/arcxcnn_bl.txt         | 30 ++++++++++++++++++++++
>  .../devicetree/bindings/vendor-prefixes.txt        |  1 +
>  2 files changed, 31 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/backlight/arcxcnn_bl.txt
> 
> diff --git a/Documentation/devicetree/bindings/leds/backlight/arcxcnn_bl.txt b/Documentation/devicetree/bindings/leds/backlight/arcxcnn_bl.txt
> new file mode 100644
> index 0000000..bcf5664
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/backlight/arcxcnn_bl.txt
> @@ -0,0 +1,30 @@
> +Binding for ArcticSand arc2c0608 LED driver
> +
> +Required properties:
> +- compatible: should be "arc,arc2c0608"
> +- reg: slave address
> +
> +Optional properties:
> +- default-brightness: brightness value on boot, value from: 0-4095
> +- label: The name of the backlight device
> +			See Documentation/devicetree/bindings/leds/common.txt
> +- led-sources: List of enabled channels from 0 to 5.
> +			See Documentation/devicetree/bindings/leds/common.txt
> +
> +Example:
> +
> +arc2c0608@30 {
> +	compatible = "arc,arc2c0608";
> +	reg = <0x30>;
> +	default-brightness = <500>;
> +	label = "lcd-backlight";
> +	linux,default-trigger = "backlight";
> +	led-sources = <0 1 2 5>;
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +	prog@6 {
> +		reg = <0x06>;
> +		val = <0x0F>;
> +	};

What is this prog@6 sub-node?

It isn't documented above, and its properties look incredibly suspicious --
this doesn't look right to me.

As a general note, please put binding patches earlier in the series than the
code implementing them, as per
Documentation/devicetree/bindings/submitting-patches.txt.

Thanks,
Mark.