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Commit 3e9e6c28 authored by YH Huang's avatar YH Huang Committed by Thierry Reding
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dt-bindings: pwm: Add MediaTek display PWM bindings 



Document the device-tree binding of MediaTek display PWM. The PWM has
one channel to control the backlight brightness for display. Both the
MT8173 and MT6595 are supported.

Signed-off-by: default avatarYH Huang <yh.huang@mediatek.com>
Signed-off-by: default avatarThierry Reding <thierry.reding@gmail.com>
parent 25ebc9ec

Documentation/devicetree/bindings/pwm/pwm-mtk-disp.txt

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+42 −0
Original line number Diff line number Diff line 
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.

 - pinctrl-names: Must contain a "default" entry.

 - pinctrl-0: One property must exist for each entry in pinctrl-names.

   See pinctrl/pinctrl-bindings.txt for details of the property values.



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";

		pinctrl-names = "default";

		pinctrl-0 = <&disp_pwm0_pins>;

	};



	backlight_lcd: backlight_lcd {

		compatible = "pwm-backlight";

		pwms = <&pwm0 0 1000000>;

		brightness-levels = <

			  0  16  32  48  64  80  96 112

			128 144 160 176 192 208 224 240

			255

		>;

		default-brightness-level = <9>;

		power-supply = <&mt6397_vio18_reg>;

		enable-gpios = <&pio 95 GPIO_ACTIVE_HIGH>;

	};