Devicetree

* Re: [PATCH v4 2/9] doc: DT: venus: binding document for Qualcomm video driver
From: Rob Herring @ 2016-12-06  0:22 UTC (permalink / raw)
  To: Stanimir Varbanov
  Cc: Mauro Carvalho Chehab, Hans Verkuil, Andy Gross, Bjorn Andersson,
	Stephen Boyd, Srinivas Kandagatla, linux-media, linux-kernel,
	linux-arm-msm, Mark Rutland, devicetree
In-Reply-To: <1480583001-32236-3-git-send-email-stanimir.varbanov@linaro.org>

On Thu, Dec 01, 2016 at 11:03:14AM +0200, Stanimir Varbanov wrote:
> Add binding document for Venus video encoder/decoder driver
> 
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: devicetree@vger.kernel.org
> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
> ---
> Rob, I have removed vmem clocks, interrupts and reg properties
> for vmem thing. Probably I will come with a separate platform
> driver fro that and pass the video memory DT node as phandle.

Looks good, a couple of minor things below.

> 
>  .../devicetree/bindings/media/qcom,venus.txt       | 82 ++++++++++++++++++++++
>  1 file changed, 82 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..a64b4ea1ebba
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/qcom,venus.txt
> @@ -0,0 +1,82 @@
> +* Qualcomm Venus video encode/decode accelerator
> +
> +- compatible:
> +	Usage: required
> +	Value type: <stringlist>
> +	Definition: Value should contain one of:
> +		- "qcom,msm8916-venus"
> +		- "qcom,msm8996-venus"
> +- 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:
> +		- "base"	Venus register base

-names is kind of pointless with only one.

> +- 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

ditto

> +- 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

It's not clear if this is in addition to the above list. I'd guess not 
and you should make it clear the above applies to the 8916 only.

> +	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
> +- 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@1d00000 {
> +		compatible = "qcom,msm8916-venus";
> +		reg = <0x01d00000 0xff000>;
> +		reg-names = "base";
> +		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
> 

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