Kernel-4.18.0-80.el8_atmel,lcdc

Atmel LCDC Framebuffer

Required properties:

• compatible :
  “atmel,at91sam9261-lcdc” ,
  “atmel,at91sam9263-lcdc” ,
  “atmel,at91sam9g10-lcdc” ,
  “atmel,at91sam9g45-lcdc” ,
  “atmel,at91sam9g45es-lcdc” ,
  “atmel,at91sam9rl-lcdc” ,
  “atmel,at32ap-lcdc”
• reg : Should contain 1 register ranges(address and length).
  Can contain an additional register range(address and length)
  for fixed framebuffer memory. Useful for dedicated memories.
• interrupts : framebuffer controller interrupt
• display: a phandle pointing to the display node

Required nodes:

• display: a display node is required to initialize the lcd panel
  This should be in the board dts.
• default-mode: a videomode within the display with timing parameters
  as specified below.

Optional properties:

• lcd-supply: Regulator for LCD supply voltage.

Example:

fb0: fb@00500000 {
    compatible = "atmel,at91sam9g45-lcdc";
    reg = <0x00500000 0x1000>;
    interrupts = <23 3 0>;
    pinctrl-names = "default";
    pinctrl-0 = <&pinctrl_fb>;
    display = <&display0>;
    #address-cells = <1>;
    #size-cells = <1>;

};

Example for fixed framebuffer memory:

fb0: fb@00500000 {
    compatible = "atmel,at91sam9263-lcdc";
    reg = <0x00700000 0x1000 0x70000000 0x200000>;
    [...]
};

Atmel LCDC Display

Required properties (as per of_videomode_helper):

• atmel,dmacon: dma controller configuration
• atmel,lcdcon2: lcd controller configuration
• atmel,guard-time: lcd guard time (Delay in frame periods)
• bits-per-pixel: lcd panel bit-depth.

Optional properties (as per of_videomode_helper):

• atmel,lcdcon-backlight: enable backlight
• atmel,lcdcon-backlight-inverted: invert backlight PWM polarity
• atmel,lcd-wiring-mode: lcd wiring mode “RGB” or “BRG”
• atmel,power-control-gpio: gpio to power on or off the LCD (as many as needed)

Example:
display0: display {
bits-per-pixel = <32>;
atmel,lcdcon-backlight;
atmel,dmacon = <0x1>;
atmel,lcdcon2 = <0x80008002>;
atmel,guard-time = <9>;
atmel,lcd-wiring-mode = <1>;

    display-timings {
        native-mode = <&timing0>;
        timing0: timing0 {
            clock-frequency = <9000000>;
            hactive = <480>;
            vactive = <272>;
            hback-porch = <1>;
            hfront-porch = <1>;
            vback-porch = <40>;
            vfront-porch = <1>;
            hsync-len = <45>;
            vsync-len = <1>;
        };
    };
};