Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / devicetree / bindings / pwm / pwm-bcm2835.txt

diff --git a/kernel/Documentation/devicetree/bindings/pwm/pwm-bcm2835.txt b/kernel/Documentation/devicetree/bindings/pwm/pwm-bcm2835.txt
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+BCM2835 PWM controller (Raspberry Pi controller)
+
+Required properties:
+- compatible: should be "brcm,bcm2835-pwm"
+- reg: physical base address and length of the controller's registers
+- clock: This clock defines the base clock frequency of the PWM hardware
+  system, the period and the duty_cycle of the PWM signal is a multiple of
+  the base period.
+- #pwm-cells: Should be 2. See pwm.txt in this directory for a description of
+  the cells format.
+
+Examples:
+
+pwm@2020c000 {
+       compatible = "brcm,bcm2835-pwm";
+       reg = <0x2020c000 0x28>;
+       clocks = <&clk_pwm>;
+       #pwm-cells = <2>;
+};
+
+clocks {
+       ....
+               clk_pwm: pwm {
+                       compatible = "fixed-clock";
+                       reg = <3>;
+                       #clock-cells = <0>;
+                       clock-frequency = <9200000>;
+               };
+       ....
+};