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

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Message-ID: <f38b38f1-0a60-d6fa-9047-23c619494b23@nvidia.com>
Date:   Wed, 17 Oct 2018 09:40:32 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
CC:     <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 30/08/2018 20:43, 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

Is it likely that 'backup' will be anything other that pll_p? If not why
not just call it pll_p? Personally, I don't 'backup' to descriptive even
though I can see what you mean.

I can see that you want to make this flexible, but if the likelihood is
that we will just use pll_p then I am not sure it is warranted at this
point.

Cheers
Jon

-- 
nvpublic