dt-bindings: pwm: Add STM32 bindings

Define bindings for pwm-stm32

version 9:
- change commit message header

version 8:
- reword st,breakinput description.

version 6:
- change st,breakinput parameter format to make it usuable on stm32f7 too.

version 2:
- use parameters instead of compatible of handle the hardware configuration

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/Documentation/devicetree/bindings/pwm/pwm-stm32.txt b/Documentation/devicetree/bindings/pwm/pwm-stm32.txt
new file mode 100644 (file)
index 0000000..6dd0403
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/pwm-stm32.txt
@@ -0,0 +1,35 @@
+STMicroelectronics STM32 Timers PWM bindings
+
+Must be a sub-node of an STM32 Timers device tree node.
+See ../mfd/stm32-timers.txt for details about the parent node.
+
+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 see ../pinctrl/pinctrl-bindings.txt
+
+Optional parameters:
+- st,breakinput:       One or two <index level filter> to describe break input configurations.
+                       "index" indicates on which break input (0 or 1) the configuration
+                       should be applied.
+                       "level" gives the active level (0=low or 1=high) of the input signal
+                       for this configuration.
+                       "filter" gives the filtering value to be applied.
+
+Example:
+       timers@40010000 {
+               #address-cells = <1>;
+               #size-cells = <0>;
+               compatible = "st,stm32-timers";
+               reg = <0x40010000 0x400>;
+               clocks = <&rcc 0 160>;
+               clock-names = "clk_int";
+
+               pwm {
+                       compatible = "st,stm32-pwm";
+                       pinctrl-0       = <&pwm1_pins>;
+                       pinctrl-names   = "default";
+                       st,breakinput = <0 1 5>;
+               };
+       };