Document the device-tree binding of MediatTek display PWM.
The PWM has one channel to control the backlight brightness for display.
It supports MT8173 and MT6595.
Signed-off-by: YH Huang <yh.huang@xxxxxxxxxxxx>
---
.../devicetree/bindings/pwm/pwm-mtk-disp.txt | 24 ++++++++++++++++++++++
1 file changed, 24 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pwm/pwm-mtk-disp.txt
diff --git a/Documentation/devicetree/bindings/pwm/pwm-mtk-disp.txt b/Documentation/devicetree/bindings/pwm/pwm-mtk-disp.txt
new file mode 100644
index 0000000..757b974
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/pwm-mtk-disp.txt
@@ -0,0 +1,24 @@
+MediaTek display PWM controller
+
+Required properties:
+ - compatible: should be "mediatek,<name>-disp-pwm"
+ - "mediatek,mt8173-disp-pwm": found on mt8173 SoC
+ - "mediatek,mt6595-disp-pwm": found on mt6595 SoC
+ - reg: physical base address and length of the controller's registers
+ - #pwm-cells: must be 2. See pwm.txt in this directory for a description of
+ the cell format
+ - clocks: phandle and clock specifier of the PWM reference clock
+ - clock-names: must contain the following
+ - "main": clock used to generate PWM signals
+ - "mm": sync signals from the modules of mmsys
+
+Example:
+ pwm0: pwm@1401e000 {
+ compatible = "mediatek,mt8173-disp-pwm",
+ "mediatek,mt6595-disp-pwm";
+ reg = <0 0x1401e000 0 0x1000>;
+ #pwm-cells = <2>;
+ clocks = <&mmsys CLK_MM_DISP_PWM026M>,
+ <&mmsys CLK_MM_DISP_PWM0MM>;
+ clock-names = "main", "mm";
+ };
--
1.8.1.1.dirty
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