On Fri, 02 Dec 2016, Benjamin Gaignard wrote:
Define bindings for pwm-stm32
version 2:
- use parameters instead of compatible of handle the hardware configuration
Signed-off-by: Benjamin Gaignard benjamin.gaignard@st.com
.../devicetree/bindings/pwm/pwm-stm32.txt | 38 ++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 Documentation/devicetree/bindings/pwm/pwm-stm32.txt
diff --git a/Documentation/devicetree/bindings/pwm/pwm-stm32.txt b/Documentation/devicetree/bindings/pwm/pwm-stm32.txt new file mode 100644 index 0000000..575b9fb --- /dev/null +++ b/Documentation/devicetree/bindings/pwm/pwm-stm32.txt @@ -0,0 +1,38 @@ +STMicroelectronics PWM driver bindings for STM32
+Must be a sub-node of STM32 general purpose timer driver +Parent node properties are describe in ../mfd/stm32-general-purpose-timer.txt
+Required parameters: +- compatible: Must be "st,stm32-pwm" +- pinctrl-names: Set to "default". +- pinctrl-0: List of phandles pointing to pin configuration nodes
for PWM module.For Pinctrl properties, please refer to [1].+Optional parameters: +- st,breakinput: Set if the hardware have break input capabilities +- st,breakinput-polarity: Set break input polarity. Default is 0
The value define the active polarity:- 0 (active LOW)- 1 (active HIGH)
+- st,breakinput-polarity-high
Then assume the default if the property is not present.
+- st,pwm-num-chan: Number of available PWM channels. Default is 0.
What's the point in having a PWM device with no channels?
Best to make this a compulsory property.
+- st,32bits-counter: Set if the hardware have a 32 bits counter +- st,complementary: Set if the hardware have complementary output channels
+[1] Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
Use relative path.
../pinctrl/pinctrl-bindings.txt
+Example:
- gptimer1: gptimer1@40010000 {
compatible = "st,stm32-gptimer";reg = <0x40010000 0x400>;clocks = <&rcc 0 160>;clock-names = "clk_int";pwm1@0 {
Don't number the node name.
pwm@xx
compatible = "st,stm32-pwm";st,pwm-num-chan = <4>;st,breakinput;st,complementary;};- };