[PATCH v7 04/11] pwm: add DT bindings documentation for atmel-hlcdc-pwm driver

[Boris Brezillon]

From: Boris BREZILLON <boris.brezillon at free-electrons.com>

The HLCDC IP available in some Atmel SoCs (i.e. sam9x5i.e. at91sam9n12,
at91sam9x5 family or sama5d3 family) provide a PWM device.

The DT bindings used for this PWM device is following the default 3 cells
bindings described in Documentation/devicetree/bindings/pwm/pwm.txt.

Signed-off-by: Boris Brezillon <boris.brezillon at free-electrons.com>
---
 .../devicetree/bindings/pwm/atmel-hlcdc-pwm.txt    | 55 ++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pwm/atmel-hlcdc-pwm.txt

diff --git a/Documentation/devicetree/bindings/pwm/atmel-hlcdc-pwm.txt b/Documentation/devicetree/bindings/pwm/atmel-hlcdc-pwm.txt
new file mode 100644
index 0000000..86ad3e2
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/atmel-hlcdc-pwm.txt
@@ -0,0 +1,55 @@
+Device-Tree bindings for Atmel's HLCDC (High LCD Controller) PWM driver
+
+The Atmel HLCDC PWM is subdevice of the HLCDC MFD device.
+See ../mfd/atmel-hlcdc.txt for more details.
+
+Required properties:
+ - compatible: value should be one of the following:
+   "atmel,hlcdc-pwm"
+ - pinctr-names: the pin control state names. Should contain "default".
+ - pinctrl-0: should contain the pinctrl states described by pinctrl
+   default.
+ - #pwm-cells: should be set to 3. This PWM chip use the default 3 cells
+   bindings defined in Documentation/devicetree/bindings/pwm/pwm.txt.
+   The first cell encodes the PWM id (0 is the only acceptable value here,
+   because the chip only provide one PWM).
+   The second cell encodes the PWM period in nanoseconds.
+   The third cell encodes the PWM flags (the only supported flag is
+   PWM_POLARITY_INVERTED)
+
+Example:
+
+	hlcdc: hlcdc at f0030000 {
+		compatible = "atmel,sama5d3-hlcdc";
+		reg = <0xf0030000 0x2000>;
+		clocks = <&lcdc_clk>, <&lcdck>, <&clk32k>;
+		clock-names = "periph_clk","sys_clk", "slow_clk";
+		status = "disabled";
+
+		hlcdc-display-controller {
+			compatible = "atmel,hlcdc-display-controller";
+			interrupts = <36 IRQ_TYPE_LEVEL_HIGH 0>;
+			pinctrl-names = "default";
+			pinctrl-0 = <&pinctrl_lcd_base &pinctrl_lcd_rgb888>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port at 0 {
+				#address-cells = <1>;
+				#size-cells = <0>;
+				reg = <0>;
+
+				hlcdc_panel_output: endpoint at 0 {
+					reg = <0>;
+					remote-endpoint = <&panel_input>;
+				};
+			};
+		};
+
+		hlcdc_pwm: hlcdc-pwm {
+			compatible = "atmel,hlcdc-pwm";
+			pinctrl-names = "default";
+			pinctrl-0 = <&pinctrl_lcd_pwm>;
+			#pwm-cells = <3>;
+		};
+	};
-- 
1.9.1