[PATCH v1 1/5] dt-bindings: cpufreq: Add binding for NVIDIA Tegra20/30
From: Dmitry Osipenko <digetx@gmail.com>
Date: 2018-08-30 19:47:26
Also in:
linux-devicetree, linux-tegra, lkml
Subsystem:
cpu frequency scaling framework, open firmware and flattened device tree bindings, the rest · Maintainers:
"Rafael J. Wysocki", Viresh Kumar, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
Add device-tree binding that describes CPU frequency-scaling hardware found on NVIDIA Tegra20/30 SoC's. Signed-off-by: Dmitry Osipenko <digetx@gmail.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 +- operating-points-v2: See ../bindings/opp/opp.txt for details. +- #cooling-cells: Should be 2. See ../thermal/thermal.txt for details. + +Example: + cpu0_opp_table: opp_table0 { + compatible = "operating-points-v2"; + + opp@216000000 { + clock-latency-ns = <300000>; + opp-hz = /bits/ 64 <216000000>; + opp-microvolt = <7500000>; + opp-suspend; + }; + + ... + }; + + cpus { + cpu@0 { + compatible = "arm,cortex-a9"; + clocks = <&tegra_car TEGRA20_CLK_PLL_X>, + <&tegra_car TEGRA20_CLK_PLL_P>, + <&tegra_car TEGRA20_CLK_CCLK>; + clock-names = "pll_x", "backup", "cpu"; + operating-points-v2 = <&cpu0_opp_table>; + #cooling-cells = <2>; + }; + };
--
2.18.0