linux-kernel - Re: [PATCH v4 2/5] media: dt: bindings: Add binding for NVIDIA Tegra Video Decoder Engine

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Date:   Sat, 11 Nov 2017 16:21:07 +0200
From:   Vladimir Zapolskiy <vz@...ia.com>
To:     Dmitry Osipenko <digetx@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Stephen Warren <swarren@...dotorg.org>
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        linux-media@...r.kernel.org, linux-tegra@...r.kernel.org,
        devel@...verdev.osuosl.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/5] media: dt: bindings: Add binding for NVIDIA Tegra
 Video Decoder Engine

Hi Dmitry,

On 10/20/2017 12:34 AM, Dmitry Osipenko wrote:
> Add binding documentation for the Video Decoder Engine which is found
> on NVIDIA Tegra20/30/114/124/132 SoC's.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  .../devicetree/bindings/media/nvidia,tegra-vde.txt | 55 ++++++++++++++++++++++
>  1 file changed, 55 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/nvidia,tegra-vde.txt
> 
> diff --git a/Documentation/devicetree/bindings/media/nvidia,tegra-vde.txt b/Documentation/devicetree/bindings/media/nvidia,tegra-vde.txt
> new file mode 100644
> index 000000000000..470237ed6fe5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/nvidia,tegra-vde.txt
> @@ -0,0 +1,55 @@
> +NVIDIA Tegra Video Decoder Engine
> +
> +Required properties:
> +- compatible : Must contain one of the following values:
> +   - "nvidia,tegra20-vde"
> +   - "nvidia,tegra30-vde"
> +   - "nvidia,tegra114-vde"
> +   - "nvidia,tegra124-vde"
> +   - "nvidia,tegra132-vde"
> +- reg : Must contain an entry for each entry in reg-names.
> +- reg-names : Must include the following entries:
> +  - sxe
> +  - bsev
> +  - mbe
> +  - ppe
> +  - mce
> +  - tfe
> +  - ppb
> +  - vdma
> +  - frameid

I've already mentioned it in my review of the driver code, but the
version from v3 with a single region is more preferable.

Also it implies that "reg-names" property will be removed.

> +- iram : Must contain phandle to the mmio-sram device node that represents
> +         IRAM region used by VDE.
> +- interrupts : Must contain an entry for each entry in interrupt-names.
> +- interrupt-names : Must include the following entries:
> +  - sync-token
> +  - bsev
> +  - sxe
> +- clocks : Must include the following entries:
> +  - vde
> +- resets : Must include the following entries:
> +  - vde
> +
> +Example:
> +
> +video-codec@...1a000 {
> +	compatible = "nvidia,tegra20-vde";
> +	reg = <0x6001a000 0x1000 /* Syntax Engine */
> +	       0x6001b000 0x1000 /* Video Bitstream Engine */
> +	       0x6001c000  0x100 /* Macroblock Engine */
> +	       0x6001c200  0x100 /* Post-processing Engine */
> +	       0x6001c400  0x100 /* Motion Compensation Engine */
> +	       0x6001c600  0x100 /* Transform Engine */
> +	       0x6001c800  0x100 /* Pixel prediction block */
> +	       0x6001ca00  0x100 /* Video DMA */
> +	       0x6001d800  0x300 /* Video frame controls */>;
> +	reg-names = "sxe", "bsev", "mbe", "ppe", "mce",
> +		    "tfe", "ppb", "vdma", "frameid";
> +	iram = <&vde_pool>; /* IRAM region */
> +	interrupts = <GIC_SPI  9 IRQ_TYPE_LEVEL_HIGH>, /* Sync token interrupt */
> +		     <GIC_SPI 10 IRQ_TYPE_LEVEL_HIGH>, /* BSE-V interrupt */
> +		     <GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>; /* SXE interrupt */
> +	interrupt-names = "sync-token", "bsev", "sxe";
> +	clocks = <&tegra_car TEGRA20_CLK_VDE>;
> +	resets = <&tegra_car 61>;
> +};
> 

--
With best wishes,
Vladimir