Kernel-4.18.0-80.el8_cirrus,clps711x-fb

• Currus Logic CLPS711X Framebuffer

Required properties:

• compatible: Shall contain “cirrus,ep7209-fb”.
• reg : Physical base address and length of the controller’s registers +

          location and size of the framebuffer memory.
  

• clocks : phandle + clock specifier pair of the FB reference clock.
• display : phandle to a display node as described in

          Documentation/devicetree/bindings/display/panel/display-timing.txt.
          Additionally, the display node has to define properties:
  

  • bits-per-pixel: Bits per pixel.
  • ac-prescale : LCD AC bias frequency. This frequency is the required

                AC bias frequency for a given manufacturer's LCD plate.
    

  • cmap-invert : Invert the color levels (Optional).

Optional properties:

• lcd-supply: Regulator for LCD supply voltage.

Example:
fb: fb@800002c0 {
compatible = “cirrus,ep7312-fb”, “cirrus,ep7209-fb”;
reg = <0x800002c0 0xd44>, <0x60000000 0xc000>;
clocks = <&clks 2>;
lcd-supply = <&reg5v0>;
display = <&display>;
};

display: display {
    model = "320x240x4";
    native-mode = <&timing0>;
    bits-per-pixel = <4>;
    ac-prescale = <17>;

    display-timings {
        timing0: 320x240 {
            hactive = <320>;
            hback-porch = <0>;
            hfront-porch = <0>;
            hsync-len = <0>;
            vactive = <240>;
            vback-porch = <0>;
            vfront-porch = <0>;
            vsync-len = <0>;
            clock-frequency = <6500000>;
        };
    };
};