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

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Message-Id: <20180830194356.14059-2-digetx@gmail.com>
Date:   Thu, 30 Aug 2018 22:43:52 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     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>,
        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: [PATCH v1 1/5] dt-bindings: cpufreq: Add binding for NVIDIA Tegra20/30

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
+- 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@...000000 {
+			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