linux-kernel - Re: [PATCH v3 1/9] doc: DT: vidc: binding document for Qualcomm video driver

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Date:   Mon, 14 Nov 2016 11:04:10 -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, Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v3 1/9] doc: DT: vidc: binding document for Qualcomm
 video driver

On Mon, Nov 07, 2016 at 07:33:55PM +0200, Stanimir Varbanov wrote:
> Add binding document for Venus video encoder/decoder driver
> 
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: devicetree@...r.kernel.org
> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
> ---
>  .../devicetree/bindings/media/qcom,venus.txt       | 98 ++++++++++++++++++++++
>  1 file changed, 98 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..b2af347fbce4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/qcom,venus.txt
> @@ -0,0 +1,98 @@
> +* Qualcomm Venus video encode/decode accelerator
> +
> +- compatible:
> +	Usage: required
> +	Value type: <stringlist>
> +	Definition: Value should contain one of:
> +		- "qcom,venus-msm8916"
> +		- "qcom,venus-msm8996"

The normal ordering is <vendor>,<soc>-<block>

> +- reg:
> +	Usage: required
> +	Value type: <prop-encoded-array>
> +	Definition: Register ranges as listed in the reg-names property.
> +- reg-names:
> +	Usage: required
> +	Value type: <stringlist>
> +	Definition: Should contain following entries:
> +		- "venus"	Venus register base
> +- reg-names:

I'd prefer these grouped as one entry for reg-names.

> +	Usage: optional for msm8996

Why optional?

> +	Value type: <stringlist>
> +	Definition: Should contain following entries:
> +		- "vmem"	Video memory register base
> +- interrupts:
> +	Usage: required
> +	Value type: <prop-encoded-array>
> +	Definition: Should contain interrupts as listed in the interrupt-names
> +		    property.
> +- interrupt-names:
> +	Usage: required
> +	Value type: <stringlist>
> +	Definition: Should contain following entries:
> +		- "venus"	Venus interrupt line
> +- interrupt-names:
> +	Usage: optional for msm8996
> +	Value type: <stringlist>
> +	Definition: Should contain following entries:
> +		- "vmem"	Video memory interrupt line
> +- clocks:
> +	Usage: required
> +	Value type: <prop-encoded-array>
> +	Definition: A List of phandle and clock specifier pairs as listed
> +		    in clock-names property.
> +- clock-names:
> +	Usage: required
> +	Value type: <stringlist>
> +	Definition: Should contain the following entries:
> +		- "core"	Core video accelerator clock
> +		- "iface"	Video accelerator AHB clock
> +		- "bus"		Video accelerator AXI clock
> +- clock-names:
> +	Usage: required for msm8996

Plus the 3 above?

> +	Value type: <stringlist>
> +	Definition: Should contain the following entries:
> +		- "subcore0"		Subcore0 video accelerator clock
> +		- "subcore1"		Subcore1 video accelerator clock
> +		- "mmssnoc_axi"		Multimedia subsystem NOC AXI clock
> +		- "mmss_mmagic_iface"	Multimedia subsystem MMAGIC AHB clock
> +		- "mmss_mmagic_mbus"	Multimedia subsystem MMAGIC MAXI clock
> +		- "mmagic_video_bus"	MMAGIC video AXI clock
> +		- "video_mbus"		Video MAXI clock
> +- clock-names:
> +	Usage: optional for msm8996

Clocks shouldn't be optional unless you failed to add in an initial 
binding.

> +	Value type: <stringlist>
> +	Definition: Should contain the following entries:
> +		- "vmem_bus"	Video memory MAXI clock
> +		- "vmem_iface"	Video memory AHB clock
> +- power-domains:
> +	Usage: required
> +	Value type: <prop-encoded-array>
> +	Definition: A phandle and power domain specifier pairs to the
> +		    power domain which is responsible for collapsing
> +		    and restoring power to the peripheral.
> +- rproc:
> +	Usage: required
> +	Value type: <prop-encoded-array>
> +	Definition: A phandle to remote processor responsible for
> +		    firmware loading and processor booting.
> +
> +- iommus:
> +	Usage: required
> +	Value type: <prop-encoded-array>
> +	Definition: A list of phandle and IOMMU specifier pairs.
> +
> +* An Example
> +	video-codec@...0000 {
> +		compatible = "qcom,venus-msm8916";
> +		reg = <0x01d00000 0xff000>;
> +		reg-names = "venus";
> +		interrupts = <GIC_SPI 44 IRQ_TYPE_LEVEL_HIGH>;
> +		interrupt-names = "venus";
> +		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>;
> +		rproc = <&venus_rproc>;
> +		iommus = <&apps_iommu 5>;
> +	};
> -- 
> 2.7.4
>