[PATCH v5 2/4] pwm: sirf: add dt-binding document

[huayi.li@csr.com (Huayi Li)]

This patch adds dt-binding document for pwm-sirf. here the controller clock
can't generate PWM signals, so we need seperate clock as signal source.

Signed-off-by: Huayi Li <huayi.li@csr.com>
---
 Documentation/devicetree/bindings/pwm/pwm-sirf.txt | 29 ++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pwm/pwm-sirf.txt

diff --git a/Documentation/devicetree/bindings/pwm/pwm-sirf.txt b/Documentation/devicetree/bindings/pwm/pwm-sirf.txt
new file mode 100644
index 0000000..221e5d9
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/pwm-sirf.txt
@@ -0,0 +1,29 @@
+SiRF prima2 & atlas6 PWM drivers
+
+Required properties:
+- compatible: "sirf,prima2-pwm"
+- reg: physical base address and length of the controller's registers
+- #pwm-cells: should be 2. See pwm.txt in this directory for a description of
+  the cells format.
+- clocks: Must contain an entry for each entry in clock-names.
+  See ../clock/prima2-clock.txt for details.
+- clock-names: Must include the following entries:
+  of clock sources to generate PWM signal,
+  - pwmc: PWM controller clock
+  - sigsrc0: source clock 0 for PWM
+  - sigsrc1: source clock 1 for PWM
+  - sigsrc2: source clock 2 for PWM
+  - sigsrc3: source clock 3 for PWM
+  - sigsrc4: source clock 4 for PWM
+
+Example:
+
+pwm: pwm at b0130000 {
+	compatible = "sirf,prima2-pwm";
+	#pwm-cells = <2>;
+	reg = <0xb0130000 0x10000>;
+	clocks = <&clks 21>, <&clks 1>, <&clks 2>,
+	       <&clks 3>, <&clks 0>, <&clks 4>;
+	clock-names = "pwmc", "sigsrc0", "sigsrc1",
+		"sigsrc2", "sigsrc3", "sigsrc4";
+};
-- 
1.9.3



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