linux-kernel - Re: [PATCH v6 4/4] dt-bindings: media: Document Synopsys Designware HDMI RX

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Date:   Wed, 5 Jul 2017 22:52:03 +0200
From:   Sylwester Nawrocki <snawrocki@...nel.org>
To:     Jose Abreu <Jose.Abreu@...opsys.com>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Carlos Palminha <CARLOS.PALMINHA@...opsys.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hans.verkuil@...co.com>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v6 4/4] dt-bindings: media: Document Synopsys Designware
 HDMI RX

On 07/04/2017 04:11 PM, Jose Abreu wrote:
> Document the bindings for the Synopsys Designware HDMI RX.
> 
> Signed-off-by: Jose Abreu <joabreu@...opsys.com>

> ---
>   .../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

Could you make the DT binding documentation patch first patch in the series?
Now checkpatch will complain about undocumented compatible string when 
the driver patches are applied alone.

> 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..449b8a2
> --- /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.

It would be good to make it clear which properties are required and which are
optional. And also to mention the properties below belong to the HDMI RX node.

> +- 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.

s/5v/HDMI 5V ?

> +
> +- clocks: Phandle to the config clock block.
> +
> +- clock-names: Shall be "cfg".
> +
> +- edid-phandle: phandle to the EDID handler block.

Could you make this property optional and when it is missing assume that device
corresponding to the parent node of this node handles EDID? This way we could
avoid having property pointing to the parent node.

> +- #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.

s/phy driver. Phy/the PHY device. PHY ?

Might be also worth to make it explicit these are all required properties.

> +- compatible: Shall be "snps,dw-hdmi-phy-e405".
> +
> +- reg: Shall be JTAG address of phy.

s/phy/the PHY ?

> +- clocks: Phandle for cfg clock.
> +
> +- clock-names:Shall be "cfg".
> +
> +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";

Perhaps just make it

	compatible = "...";
?

> +	reg = <0x11c00 0x1000>; /* EDIDs */

This is not relevant and undocumented, will likely be part of documentation 
of other binding thus I'd suggest dropping this reg property.

> +	#address-cells = <1>;
> +	#size-cells = <1>;
> +	ranges;
> +
> +	hdmi-rx@0 {
> +		compatible = "snps,dw-hdmi-rx";
> +		reg = <0x0 0x10000>;
> +		interrupts = <1 2>;
> +		edid-phandle = <&dw_hdmi_soc>;
> +
> +		clocks = <&dw_hdmi_refclk>;
> +		clock-names = "cfg";
> +
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		hdmi-phy@fc {
> +			compatible = "snps,dw-hdmi-phy-e405";
> +			reg = <0xfc>;
> +
> +			clocks = <&dw_hdmi_refclk>;
> +			clock-names = "cfg";
> +		};
> +	};
> +};

Otherwise looks good. I'll likely not have comments to the other patches.

--
Regards,
Sylwester