Add DT binding details for the PWM based generic tachometer
driver which gets the period of the PWM tach-output from Fan
via PWM IP having capability of capturing the signal.
Signed-off-by: Rajkumar Rampelli <rrajk@xxxxxxxxxx>
---
.../bindings/hwmon/generic-pwm-tachometer.txt | 25 ++++++++++++++++++++++
1 file changed, 25 insertions(+)
create mode 100644 Documentation/devicetree/bindings/hwmon/generic-pwm-tachometer.txt
diff --git a/Documentation/devicetree/bindings/hwmon/generic-pwm-tachometer.txt b/Documentation/devicetree/bindings/hwmon/generic-pwm-tachometer.txt
new file mode 100644
index 0000000..3541fe5
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/generic-pwm-tachometer.txt
@@ -0,0 +1,25 @@
+Device tree bindings for fan tach output connected to PWM controller with
+PWM capture capability.
+
+Required properties:
+- compatible : Should be "generic-pwm-tachometer"
+- pwms : PWM handle. Please refer pwm.txt DT binding for more details.
+
+Example:
+ tegra_tachometer: tachometer@39c0000 {
+ compatible = "nvidia,tegra186-pwm-tachometer";
+ reg = <0x0 0x039c0000 0x0 0x10>;
+ clocks = <&bpmp_clks TEGRA194_CLK_TACH>;
+ clock-names = "tachometer";
+ resets = <&bpmp_resets TEGRA194_RESET_TACH>;
+ reset-names = "tachometer";
+ nvidia,pulse-per-rev = <2>;
+ nvidia,sampling-window = <2>;
+ status = "okay";
+ };
+
+ generic_pwm_tachometer {
+ compatible = "generic-pwm-tachometer";
+ pwms = <&tegra_tachometer 0 1000000>;
+ status = "okay";
+ };
--
2.1.4
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