linux-kernel - Re: [PATCH v1 06/17] dt-bindings: cpufreq: Add binding for NVIDIA Tegra20/30

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Message-ID: <20191016051336.oeyz56sdh3cae5yn@vireshk-i7>
Date:   Wed, 16 Oct 2019 10:43:36 +0530
From:   Viresh Kumar <viresh.kumar@...aro.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>,
        Prashant Gaikwad <pgaikwad@...dia.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        linux-pm@...r.kernel.org, linux-tegra@...r.kernel.org,
        devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 06/17] dt-bindings: cpufreq: Add binding for NVIDIA
 Tegra20/30

On 16-10-19, 00:16, Dmitry Osipenko wrote:
> Add device-tree binding that describes CPU frequency-scaling hardware
> found on NVIDIA Tegra20/30 SoCs.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  .../cpufreq/nvidia,tegra20-cpufreq.txt        | 56 +++++++++++++++++++
>  1 file changed, 56 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..daeca6ae6b76
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/cpufreq/nvidia,tegra20-cpufreq.txt
> @@ -0,0 +1,56 @@
> +Binding for NVIDIA Tegra20 CPUFreq
> +==================================
> +
> +Required properties:
> +- clocks: Must contain an entry for the CPU clock.
> +  See ../clocks/clock-bindings.txt for details.
> +- operating-points-v2: See ../bindings/opp/opp.txt for details.
> +- #cooling-cells: Should be 2. See ../thermal/thermal.txt for details.
> +
> +For each opp entry in 'operating-points-v2' table:
> +- opp-supported-hw: Two bitfields indicating:
> +	On Tegra20:
> +	1. CPU process ID mask
> +	2. SoC speedo ID mask
> +
> +	On Tegra30:
> +	1. CPU process ID mask
> +	2. CPU speedo ID mask
> +
> +	A bitwise AND is performed against these values and if any bit
> +	matches, the OPP gets enabled.
> +
> +- opp-microvolt: CPU voltage triplet.
> +
> +Optional properties:
> +- cpu-supply: Phandle to the CPU power supply.
> +
> +Example:
> +	regulators {
> +		cpu_reg: regulator0 {
> +			regulator-name = "vdd_cpu";
> +		};
> +	};
> +
> +	cpu0_opp_table: opp_table0 {
> +		compatible = "operating-points-v2";
> +
> +		opp@...000000 {
> +			clock-latency-ns = <125000>;
> +			opp-microvolt = <825000 825000 1125000>;
> +			opp-supported-hw = <0x03 0x0001>;
> +			opp-hz = /bits/ 64 <456000000>;
> +		};
> +
> +		...
> +	};
> +
> +	cpus {
> +		cpu@0 {
> +			compatible = "arm,cortex-a9";
> +			clocks = <&tegra_car TEGRA20_CLK_CCLK>;
> +			operating-points-v2 = <&cpu0_opp_table>;
> +			cpu-supply = <&cpu_reg>;
> +			#cooling-cells = <2>;
> +		};
> +	};

LGTM.

-- 
viresh