Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / devicetree / bindings / clock / pwm-clock.txt

diff --git a/kernel/Documentation/devicetree/bindings/clock/pwm-clock.txt b/kernel/Documentation/devicetree/bindings/clock/pwm-clock.txt
new file mode 100644 (file)
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+Binding for an external clock signal driven by a PWM pin.
+
+This binding uses the common clock binding[1] and the common PWM binding[2].
+
+[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
+[2] Documentation/devicetree/bindings/pwm/pwm.txt
+
+Required properties:
+- compatible : shall be "pwm-clock".
+- #clock-cells : from common clock binding; shall be set to 0.
+- pwms : from common PWM binding; this determines the clock frequency
+  via the period given in the PWM specifier.
+
+Optional properties:
+- clock-output-names : From common clock binding.
+- clock-frequency : Exact output frequency, in case the PWM period
+  is not exact but was rounded to nanoseconds.
+
+Example:
+       clock {
+               compatible = "pwm-clock";
+               #clock-cells = <0>;
+               clock-frequency = <25000000>;
+               clock-output-names = "mipi_mclk";
+               pwms = <&pwm2 0 40>; /* 1 / 40 ns = 25 MHz */
+       };