The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/pwm/pwm-mtk-disp.txt

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    1 MediaTek display PWM controller
    2 
    3 Required properties:
    4  - compatible: should be "mediatek,<name>-disp-pwm":
    5    - "mediatek,mt2701-disp-pwm": found on mt2701 SoC.
    6    - "mediatek,mt6595-disp-pwm": found on mt6595 SoC.
    7    - "mediatek,mt8167-disp-pwm", "mediatek,mt8173-disp-pwm": found on mt8167 SoC.
    8    - "mediatek,mt8173-disp-pwm": found on mt8173 SoC.
    9    - "mediatek,mt8183-disp-pwm": found on mt8183 SoC.$
   10  - reg: physical base address and length of the controller's registers.
   11  - #pwm-cells: must be 2. See pwm.yaml in this directory for a description of
   12    the cell format.
   13  - clocks: phandle and clock specifier of the PWM reference clock.
   14  - clock-names: must contain the following:
   15    - "main": clock used to generate PWM signals.
   16    - "mm": sync signals from the modules of mmsys.
   17  - pinctrl-names: Must contain a "default" entry.
   18  - pinctrl-0: One property must exist for each entry in pinctrl-names.
   19    See pinctrl/pinctrl-bindings.txt for details of the property values.
   20 
   21 Example:
   22         pwm0: pwm@1401e000 {
   23                 compatible = "mediatek,mt8173-disp-pwm",
   24                              "mediatek,mt6595-disp-pwm";
   25                 reg = <0 0x1401e000 0 0x1000>;
   26                 #pwm-cells = <2>;
   27                 clocks = <&mmsys CLK_MM_DISP_PWM026M>,
   28                          <&mmsys CLK_MM_DISP_PWM0MM>;
   29                 clock-names = "main", "mm";
   30                 pinctrl-names = "default";
   31                 pinctrl-0 = <&disp_pwm0_pins>;
   32         };
   33 
   34         backlight_lcd: backlight_lcd {
   35                 compatible = "pwm-backlight";
   36                 pwms = <&pwm0 0 1000000>;
   37                 brightness-levels = <
   38                           0  16  32  48  64  80  96 112
   39                         128 144 160 176 192 208 224 240
   40                         255
   41                 >;
   42                 default-brightness-level = <9>;
   43                 power-supply = <&mt6397_vio18_reg>;
   44                 enable-gpios = <&pio 95 GPIO_ACTIVE_HIGH>;
   45         };

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