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Message-ID: <20160305043001.GB13525@rob-hp-laptop>
Date:	Fri, 4 Mar 2016 22:30:01 -0600
From:	Rob Herring <robh@...nel.org>
To:	Alexey Brodkin <Alexey.Brodkin@...opsys.com>
Cc:	linux-kernel@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH 2/4 v2] drm: Add DT bindings documentation for ARC PGU
 display controller

On Thu, Mar 03, 2016 at 05:39:14PM +0300, Alexey Brodkin wrote:
> This add DT bindings documentation for ARC PGU display controller.
> 
> Signed-off-by: Alexey Brodkin <abrodkin@...opsys.com>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Pawel Moll <pawel.moll@....com>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Ian Campbell <ijc+devicetree@...lion.org.uk>
> Cc: Kumar Gala <galak@...eaurora.org>
> Cc: devicetree@...r.kernel.org
> Cc: linux-snps-arc@...ts.infradead.org
> ---
> 
> Changes v1 -> v2:
>  * Clean-up

Not really useful. What we like to see is what changed. Maintainers have 
short memories and don't remember what they said previously (unless 
comments are ignored).

> 
>  .../devicetree/bindings/display/snps,arcpgu.txt    | 33 ++++++++++++++++++++++
>  1 file changed, 33 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/snps,arcpgu.txt
> 
> diff --git a/Documentation/devicetree/bindings/display/snps,arcpgu.txt b/Documentation/devicetree/bindings/display/snps,arcpgu.txt
> new file mode 100644
> index 0000000..57f3bc8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/snps,arcpgu.txt
> @@ -0,0 +1,33 @@
> +ARC PGU
> +
> +This is a display controller found on several development boards produced
> +by Synopsys. The ARC PGU is an RGB streamer that reads the data from a
> +framebuffer and sends it to a single digital encoder (usually HDMI).
> +
> +Required properties:
> +  - compatible: "snps,arcpgu"
> +  - reg: Physical base address and length of the controller's registers.
> +  - clocks: A list of phandle + clock-specifier pairs, one for each
> +    entry in 'clock-names'.
> +  - clock-names: A list of clock names. For ARC PGU it should contain:
> +      - "pxlclk" for the clock feeding the output PLL of the controller.
> +
> +Required sub-nodes:
> +  - port: The PGU connection to an encoder chip. The connection is modelled
> +    using the OF graph bindings specified in
> +    Documentation/devicetree/bindings/graph.txt.
> +
> +Example:
> +
> +/ {
> +	...
> +
> +	pgu@...XXXXX {
> +		compatible = "snps,arcpgu";
> +		reg = <0xXXXXXXXX 0x400>;
> +		clocks = <&clock_node>;
> +		clock-names = "pxlclk";

Where's the port? Didn't you previously say it was optional?

> +	};
> +
> +	...
> +};
> -- 
> 2.5.0
> 

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