Supply Device tree binding documentation for the NVIDIA
Tegra186 SoC's Tachometer Controller
Signed-off-by: Rajkumar Rampelli <rr...@nvidia.com>
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.../bindings/pwm/pwm-tegra-tachometer.txt | 31 ++++++++++++++++++++++
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Documentation/devicetree/bindings/pwm/pwm-tegra-tachometer.txt
diff --git a/Documentation/devicetree/bindings/pwm/pwm-tegra-tachometer.txt
b/Documentation/devicetree/bindings/pwm/pwm-tegra-tachometer.txt
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+Bindings for a PWM based Tachometer driver
+
+Required properties:
+- compatible: Must be "nvidia,tegra186-pwm-tachometer"
+- reg: physical base addresses of the controller and length of
+ memory mapped region.
+- #pwm-cells: should be 2. See pwm.txt in this directory for a
+ description of the cells format.
+- clocks: phandle list of tachometer clocks
+- clock-names: should be "tachometer". See clock-bindings.txt in documentations
+- resets: phandle to the reset controller for the Tachometer IP
+- reset-names: should be "tachometer". See reset.txt in documentations
+- nvidia,pulse-per-rev: Integer, pulses per revolution of a Fan. This value
+ obtained from Fan specification document.
+- nvidia,capture-window-len: Integer, window of the Fan Tach monitor, it
indicates
+ that how many period of the input fan tach signal will the FAN TACH logic
+ monitor. Valid values are 1, 2, 4 and 8 only.
+
+Example:
+ tegra_tachometer: tachometer@39c0000 {
+ compatible = "nvidia,tegra186-pwm-tachometer";
+ reg = <0x0 0x039c0000 0x0 0x10>;
+ #pwm-cells = <2>;
+ clocks = <&tegra_car TEGRA186_CLK_TACH>;
+ clock-names = "tachometer";
+ resets = <&tegra_car TEGRA186_RESET_TACH>;
+ reset-names = "tachometer";
+ nvidia,pulse-per-rev = <2>;
+ nvidia,capture-window-len = <2>;
+ status = "disabled";
+ };
--
2.1.4
