dt-bindings: pwm: Add STM32 LPTimer PWM binding

Add documentation for STMicroelectronics STM32 Low-Power Timer
PWM binding.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/Documentation/devicetree/bindings/pwm/pwm-stm32-lp.txt b/Documentation/devicetree/bindings/pwm/pwm-stm32-lp.txt
new file mode 100644 (file)
index 0000000..f8338d1
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/pwm-stm32-lp.txt
@@ -0,0 +1,24 @@
+STMicroelectronics STM32 Low-Power Timer PWM
+
+STM32 Low-Power Timer provides single channel PWM.
+
+Must be a sub-node of an STM32 Low-Power Timer device tree node.
+See ../mfd/stm32-lptimer.txt for details about the parent node.
+
+Required parameters:
+- compatible:          Must be "st,stm32-pwm-lp".
+
+Optional properties:
+- pinctrl-names:       Set to "default".
+- pinctrl-0:           Phandle pointing to pin configuration node for PWM.
+
+Example:
+       timer@40002400 {
+               compatible = "st,stm32-lptimer";
+               ...
+               pwm {
+                       compatible = "st,stm32-pwm-lp";
+                       pinctrl-names = "default";
+                       pinctrl-0 = <&lppwm1_pins>;
+               };
+       };