linux-kernel - Re: [PATCH v1 1/2] staging: Introduce NVIDIA Tegra20 video decoder driver

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Message-ID: <38daee0d-0595-a7e4-69bb-5a2ddbd832b5@wwwdotorg.org>
Date:   Mon, 25 Sep 2017 17:01:23 -0600
From:   Stephen Warren <swarren@...dotorg.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>, linux-tegra@...r.kernel.org,
        devel@...verdev.osuosl.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] staging: Introduce NVIDIA Tegra20 video decoder
 driver

On 09/25/2017 04:15 PM, Dmitry Osipenko wrote:
> Video decoder, found on NVIDIA Tegra20 SoC, supports a standard set of
> video formats like H.264 / MPEG-4 / WMV / VC1. Currently driver supports
> decoding of CAVLC H.264 only.

Note: I don't know anything much about video decoding on Tegra (just NV 
desktop GPUs, and that was a while ago), but I had a couple small 
comments on the DT binding:

> diff --git a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-vde.txt b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-vde.txt

> +NVIDIA Tegra Video Decoder Engine
> +
> +Required properties:
> +- compatible : "nvidia,tegra20-vde"
> +- reg : Must contain 2 register ranges: registers and IRAM area.
> +- reg-names : Must include the following entries:
> +  - regs
> +  - iram

I think the IRAM region needs more explanation: What is the region used 
for and by what? Can it be moved, and if so does the move need to be 
co-ordinated with any other piece of SW?

> +- clocks : Must contain one entry, for the module clock.
> +  See ../clocks/clock-bindings.txt for details.
> +- resets : Must contain an entry for each entry in reset-names.
> +  See ../reset/reset.txt for details.
> +- reset-names : Must include the following entries:
> +  - vde

Let's require a clock-names property too.