linux-kernel - Re: [PATCH v6 2/9] doc: DT: venus: binding document for Qualcomm video driver

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Date:   Tue, 21 Feb 2017 18:09:52 -0600
From:   Rob Herring <robh@...nel.org>
To:     Stanimir Varbanov <stanimir.varbanov@...aro.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil@...all.nl>,
        Andy Gross <andy.gross@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v6 2/9] doc: DT: venus: binding document for Qualcomm
 video driver

On Tue, Feb 07, 2017 at 03:10:17PM +0200, Stanimir Varbanov wrote:
> Add binding document for Venus video encoder/decoder driver
> 
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: devicetree@...r.kernel.org
> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
> ---
> Changes since previous v5:
>  * dropped rproc phandle (remoteproc is not used anymore)
>  * added subnodes paragraph with descrition of three subnodes:
>     - video-decoder and video-encoder - describes decoder (core0) and
>     encoder (core1) power-domains and clocks (applicable for msm8996
>     Venus core).
>     - video-firmware - needed to get reserved memory region where the
>     firmware is stored.
> 
>  .../devicetree/bindings/media/qcom,venus.txt       | 112 +++++++++++++++++++++
>  1 file changed, 112 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/qcom,venus.txt
> 
> diff --git a/Documentation/devicetree/bindings/media/qcom,venus.txt b/Documentation/devicetree/bindings/media/qcom,venus.txt
> new file mode 100644
> index 000000000000..4427af3ca5a5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/qcom,venus.txt
> @@ -0,0 +1,112 @@

[...]

> +* Subnodes
> +The Venus node must contain three subnodes representing video-decoder,
> +video-encoder and video-firmware.

[...]

> +The video-firmware subnode should contain:
> +
> +- memory-region:
> +	Usage: required
> +	Value type: <phandle>
> +	Definition: reference to the reserved-memory for the memory region
> +
> +* An Example
> +	video-codec@...0000 {
> +		compatible = "qcom,msm8916-venus";
> +		reg = <0x01d00000 0xff000>;
> +		interrupts = <GIC_SPI 44 IRQ_TYPE_LEVEL_HIGH>;
> +		clocks = <&gcc GCC_VENUS0_VCODEC0_CLK>,
> +			 <&gcc GCC_VENUS0_AHB_CLK>,
> +			 <&gcc GCC_VENUS0_AXI_CLK>;
> +		clock-names = "core", "iface", "bus";
> +		power-domains = <&gcc VENUS_GDSC>;
> +		iommus = <&apps_iommu 5>;
> +
> +		video-decoder {
> +			compatible = "venus-decoder";
> +			clocks = <&mmcc VIDEO_SUBCORE0_CLK>;
> +			clock-names = "core";
> +			power-domains = <&mmcc VENUS_CORE0_GDSC>;
> +		};
> +
> +		video-encoder {
> +			compatible = "venus-encoder";
> +			clocks = <&mmcc VIDEO_SUBCORE1_CLK>;
> +			clock-names = "core";
> +			power-domains = <&mmcc VENUS_CORE1_GDSC>;
> +		};
> +
> +		video-firmware {
> +			memory-region = <&venus_mem>;

Why does this need to be a sub node?

Rob