linux-kernel - Re: [PATCH v4 4/4] dt-bindings: media: Document Synopsys Designware HDMI RX

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Date:   Fri, 23 Jun 2017 16:58:14 -0500
From:   Rob Herring <robh@...nel.org>
To:     Jose Abreu <Jose.Abreu@...opsys.com>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        Carlos Palminha <CARLOS.PALMINHA@...opsys.com>,
        Mark Rutland <mark.rutland@....com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Sylwester Nawrocki <snawrocki@...nel.org>
Subject: Re: [PATCH v4 4/4] dt-bindings: media: Document Synopsys Designware
 HDMI RX

On Tue, Jun 20, 2017 at 06:26:12PM +0100, Jose Abreu wrote:
> Document the bindings for the Synopsys Designware HDMI RX.
> 
> Signed-off-by: Jose Abreu <joabreu@...opsys.com>
> Cc: Carlos Palminha <palminha@...opsys.com>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
> Cc: Hans Verkuil <hans.verkuil@...co.com>
> Cc: Sylwester Nawrocki <snawrocki@...nel.org>
> 
> Changes from v3:
> 	- Document the new DT bindings suggested by Sylwester
> Changes from v2:
> 	- Document edid-phandle property
> ---
>  .../devicetree/bindings/media/snps,dw-hdmi-rx.txt  | 70 ++++++++++++++++++++++
>  1 file changed, 70 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.txt
> 
> diff --git a/Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.txt b/Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.txt
> new file mode 100644
> index 0000000..efb0ac3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.txt
> @@ -0,0 +1,70 @@
> +Synopsys DesignWare HDMI RX Decoder
> +===================================
> +
> +This document defines device tree properties for the Synopsys DesignWare HDMI
> +RX Decoder (DWC HDMI RX). It doesn't constitute a device tree binding
> +specification by itself but is meant to be referenced by platform-specific
> +device tree bindings.
> +
> +When referenced from platform device tree bindings the properties defined in
> +this document are defined as follows.
> +
> +- compatible: Shall be "snps,dw-hdmi-rx".
> +
> +- reg: Memory mapped base address and length of the DWC HDMI RX registers.
> +
> +- interrupts: Reference to the DWC HDMI RX interrupt and 5v sense interrupt.
> +
> +- clocks: Phandle to the config clock block.
> +
> +- clock-names: Shall be "cfg-clk".

"-clk" is redundant.

Seems strange that this is the only clock. The only other clock is the 
HDMI clock from the HDMI transmitter.

> +
> +- edid-phandle: phandle to the EDID handler block.
> +
> +- #address-cells: Shall be 1.
> +
> +- #size-cells: Shall be 0.
> +
> +You also have to create a subnode for phy driver. Phy properties are as follows.
> +
> +- compatible: Shall be "snps,dw-hdmi-phy-e405".
> +
> +- reg: Shall be JTAG address of phy.
> +
> +- clocks: Phandle for cfg clock.
> +
> +- clock-names:Shall be "cfg-clk".
> +
> +A sample binding is now provided. The compatible string is for a SoC which has
> +has a Synopsys Designware HDMI RX decoder inside.
> +
> +Example:
> +
> +dw_hdmi_soc: dw-hdmi-soc@0 {
> +	compatible = "snps,dw-hdmi-soc";

Not documented.

> +	reg = <0x11c00 0x1000>; /* EDIDs */
> +	#address-cells = <1>;
> +	#size-cells = <1>;
> +	ranges;
> +
> +	dw_hdmi_rx@0 {

hdmi-rx@0

> +		compatible = "snps,dw-hdmi-rx";
> +		reg = <0x0 0x10000>;
> +		interrupts = <1 2>;
> +		edid-phandle = <&dw_hdmi_soc>;

Don't need this if it is the parent node.

> +
> +		clocks = <&dw_hdmi_refclk>;
> +		clock-names = "cfg-clk";
> +
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		dw_hdmi_phy_e405@fc {

hdmi-phy@fc

> +			compatible = "snps,dw-hdmi-phy-e405";
> +			reg = <0xfc>;
> +
> +			clocks = <&dw_hdmi_refclk>;
> +			clock-names = "cfg-clk";
> +		};
> +	};
> +};
> -- 
> 1.9.1
> 
>