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@xxxxxxxxx>
> ---
> .../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@456000000 {
> + 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>;
> + };
> + };
Acked-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
--
viresh
