linux-kernel - Re: [PATCH v1 1/5] dt-bindings: cpufreq: Add binding for NVIDIA Tegra20/30

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Date:   Tue, 25 Sep 2018 11:58:10 -0500
From:   Rob Herring <robh@...nel.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/5] dt-bindings: cpufreq: Add binding for NVIDIA
 Tegra20/30

On Thu, Aug 30, 2018 at 10:43:52PM +0300, Dmitry Osipenko wrote:
> Add device-tree binding that describes CPU frequency-scaling hardware
> found on NVIDIA Tegra20/30 SoC's.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  .../cpufreq/nvidia,tegra20-cpufreq.txt        | 38 +++++++++++++++++++
>  1 file changed, 38 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/cpufreq/nvidia,tegra20-cpufreq.txt
> 
> diff --git a/Documentation/devicetree/bindings/cpufreq/nvidia,tegra20-cpufreq.txt b/Documentation/devicetree/bindings/cpufreq/nvidia,tegra20-cpufreq.txt
> new file mode 100644
> index 000000000000..2c51f676e958
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/cpufreq/nvidia,tegra20-cpufreq.txt
> @@ -0,0 +1,38 @@
> +Binding for NVIDIA Tegra20 CPUFreq
> +==================================
> +
> +Required properties:
> +- clocks: Must contain an entry for each entry in clock-names.
> +  See ../clocks/clock-bindings.txt for details.
> +- clock-names: Must include the following entries:
> +  - pll_x: main-parent for CPU clock, must be the first entry
> +  - backup: intermediate-parent for CPU clock
> +  - cpu: the CPU clock

The Cortex A9 has CLK, PERIPHCLK, and PERIPHCLKEN clocks and only CLK 
is used for the cpu core. You can't just define your own clocks that 
you happen to want access to.

Otherwise, you're not defining anything new here, so a binding document 
isn't required.

Rob