Kernel-4.18.0-80.el8_brcm,bcm-vc4

published: updated: Kernel_4.18.0-80.el8_内核文档

Broadcom VC4 (VideoCore4) GPU

The VC4 device present on the Raspberry Pi includes a display system
with HDMI output and the HVS (Hardware Video Scaler) for compositing
display planes.

Required properties for VC4:

  • compatible: Should be “brcm,bcm2835-vc4” or “brcm,cygnus-vc4”

Required properties for Pixel Valve:

  • compatible: Should be one of “brcm,bcm2835-pixelvalve0”,
        "brcm,bcm2835-pixelvalve1", or "brcm,bcm2835-pixelvalve2"
  • reg: Physical base address and length of the PV’s registers
  • interrupts: The interrupt number
        See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt

Required properties for HVS:

  • compatible: Should be “brcm,bcm2835-hvs”
  • reg: Physical base address and length of the HVS’s registers
  • interrupts: The interrupt number
        See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt

Required properties for HDMI

  • compatible: Should be “brcm,bcm2835-hdmi”
  • reg: Physical base address and length of the two register ranges
        ("HDMI" and "HD", in that order)
  • interrupts: The interrupt numbers
        See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
  • ddc: phandle of the I2C controller used for DDC EDID probing
  • clocks: a) hdmi: The HDMI state machine clock
      b) pixel: The pixel clock.

Optional properties for HDMI:

  • hpd-gpios: The GPIO pin for HDMI hotplug detect (if it doesn’t appear
        as an interrupt/status bit in the HDMI controller
    itself).  See bindings/pinctrl/brcm,bcm2835-gpio.txt
  • dmas: Should contain one entry pointing to the DMA channel used to
      transfer audio data
  • dma-names: Should contain “audio-rx”

Required properties for DPI:

  • compatible: Should be “brcm,bcm2835-dpi”
  • reg: Physical base address and length of the registers
  • clocks: a) core: The core clock the unit runs on
      b) pixel: The pixel clock that feeds the pixelvalve
  • port: Port node with a single endpoint connecting to the panel
        device, as defined in [1]

Required properties for VEC:

  • compatible: Should be “brcm,bcm2835-vec”
  • reg: Physical base address and length of the registers
  • clocks: The core clock the unit runs on
  • interrupts: The interrupt number
        See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt

Required properties for V3D:

  • compatible: Should be “brcm,bcm2835-v3d” or “brcm,cygnus-v3d”
  • reg: Physical base address and length of the V3D’s registers
  • interrupts: The interrupt number
        See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt

Optional properties for V3D:

  • clocks: The clock the unit runs on

Required properties for DSI:

  • compatible: Should be “brcm,bcm2835-dsi0” or “brcm,bcm2835-dsi1”
  • reg: Physical base address and length of the DSI block’s registers
  • interrupts: The interrupt number
        See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
  • clocks: a) phy: The DSI PLL clock feeding the DSI analog PHY
      b) escape: The DSI ESC clock from CPRMAN
  c) pixel: The DSI pixel clock from CPRMAN
  • clock-output-names:
      The 3 clocks output from the DSI analog PHY: dsi[01]_byte,
  dsi[01]_ddr2, and dsi[01]_ddr

[1] Documentation/devicetree/bindings/media/video-interfaces.txt

Example:
pixelvalve@7e807000 {
compatible = “brcm,bcm2835-pixelvalve2”;
reg = <0x7e807000 0x100>;
interrupts = <2 10>; /* pixelvalve */
};

hvs@7e400000 {
compatible = “brcm,bcm2835-hvs”;
reg = <0x7e400000 0x6000>;
interrupts = <2 1>;
};

hdmi: hdmi@7e902000 {
compatible = “brcm,bcm2835-hdmi”;
reg = <0x7e902000 0x600>,
<0x7e808000 0x100>;
interrupts = <2 8>, <2 9>;
ddc = <&i2c2>;
hpd-gpios = <&gpio 46 GPIO_ACTIVE_HIGH>;
clocks = <&clocks BCM2835_PLLH_PIX>,
<&clocks BCM2835_CLOCK_HSM>;
clock-names = “pixel”, “hdmi”;
};

dpi: dpi@7e208000 {
compatible = “brcm,bcm2835-dpi”;
reg = <0x7e208000 0x8c>;
clocks = <&clocks BCM2835_CLOCK_VPU>,
<&clocks BCM2835_CLOCK_DPI>;
clock-names = “core”, “pixel”;
#address-cells = <1>;
#size-cells = <0>;

port {
    dpi_out: endpoint@0 {
        remote-endpoint = <&panel_in>;
    };
};

};

dsi1: dsi@7e700000 {
compatible = “brcm,bcm2835-dsi1”;
reg = <0x7e700000 0x8c>;
interrupts = <2 12>;
#address-cells = <1>;
#size-cells = <0>;
#clock-cells = <1>;

clocks = <&clocks BCM2835_PLLD_DSI1>,
     <&clocks BCM2835_CLOCK_DSI1E>,
     <&clocks BCM2835_CLOCK_DSI1P>;
clock-names = "phy", "escape", "pixel";

clock-output-names = "dsi1_byte", "dsi1_ddr2", "dsi1_ddr";

pitouchscreen: panel@0 {
    compatible = "raspberrypi,touchscreen";
    reg = <0>;

    <...>
};

};

vec: vec@7e806000 {
compatible = “brcm,bcm2835-vec”;
reg = <0x7e806000 0x1000>;
clocks = <&clocks BCM2835_CLOCK_VEC>;
interrupts = <2 27>;
};

v3d: v3d@7ec00000 {
compatible = “brcm,bcm2835-v3d”;
reg = <0x7ec00000 0x1000>;
interrupts = <1 10>;
};

vc4: gpu {
compatible = “brcm,bcm2835-vc4”;
};

panel: panel {
compatible = “ontat,yx700wv03”, “simple-panel”;

port {
    panel_in: endpoint {
        remote-endpoint = <&dpi_out>;
    };
};

};

oosTech by Sam Lee