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08302c35b5
The DPI interface involves taking a ton of our GPIOs to be used as
outputs, and routing display signals over them in parallel.
v2: Use display_info.bus_formats[] to replace our custom DT
properties.
v3: Rebase on V3D documentation changes.
v4: Fix rebase detritus from V3D documentation changes.
Signed-off-by: Eric Anholt <eric@anholt.net>
Acked-by: Rob Herring <robh@kernel.org>
114 lines
3.2 KiB
Plaintext
114 lines
3.2 KiB
Plaintext
Broadcom VC4 (VideoCore4) GPU
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The VC4 device present on the Raspberry Pi includes a display system
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with HDMI output and the HVS (Hardware Video Scaler) for compositing
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display planes.
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Required properties for VC4:
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- compatible: Should be "brcm,bcm2835-vc4"
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Required properties for Pixel Valve:
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- compatible: Should be one of "brcm,bcm2835-pixelvalve0",
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"brcm,bcm2835-pixelvalve1", or "brcm,bcm2835-pixelvalve2"
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- reg: Physical base address and length of the PV's registers
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- interrupts: The interrupt number
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See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
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Required properties for HVS:
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- compatible: Should be "brcm,bcm2835-hvs"
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- reg: Physical base address and length of the HVS's registers
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- interrupts: The interrupt number
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See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
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Required properties for HDMI
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- compatible: Should be "brcm,bcm2835-hdmi"
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- reg: Physical base address and length of the two register ranges
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("HDMI" and "HD", in that order)
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- interrupts: The interrupt numbers
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See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
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- ddc: phandle of the I2C controller used for DDC EDID probing
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- clocks: a) hdmi: The HDMI state machine clock
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b) pixel: The pixel clock.
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Optional properties for HDMI:
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- hpd-gpios: The GPIO pin for HDMI hotplug detect (if it doesn't appear
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as an interrupt/status bit in the HDMI controller
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itself). See bindings/pinctrl/brcm,bcm2835-gpio.txt
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Required properties for DPI:
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- compatible: Should be "brcm,bcm2835-dpi"
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- reg: Physical base address and length of the registers
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- clocks: a) core: The core clock the unit runs on
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b) pixel: The pixel clock that feeds the pixelvalve
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- port: Port node with a single endpoint connecting to the panel
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device, as defined in [1]
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Required properties for V3D:
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- compatible: Should be "brcm,bcm2835-v3d"
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- reg: Physical base address and length of the V3D's registers
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- interrupts: The interrupt number
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See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
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[1] Documentation/devicetree/bindings/media/video-interfaces.txt
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Example:
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pixelvalve@7e807000 {
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compatible = "brcm,bcm2835-pixelvalve2";
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reg = <0x7e807000 0x100>;
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interrupts = <2 10>; /* pixelvalve */
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};
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hvs@7e400000 {
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compatible = "brcm,bcm2835-hvs";
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reg = <0x7e400000 0x6000>;
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interrupts = <2 1>;
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};
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hdmi: hdmi@7e902000 {
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compatible = "brcm,bcm2835-hdmi";
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reg = <0x7e902000 0x600>,
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<0x7e808000 0x100>;
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interrupts = <2 8>, <2 9>;
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ddc = <&i2c2>;
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hpd-gpios = <&gpio 46 GPIO_ACTIVE_HIGH>;
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clocks = <&clocks BCM2835_PLLH_PIX>,
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<&clocks BCM2835_CLOCK_HSM>;
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clock-names = "pixel", "hdmi";
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};
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dpi: dpi@7e208000 {
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compatible = "brcm,bcm2835-dpi";
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reg = <0x7e208000 0x8c>;
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clocks = <&clocks BCM2835_CLOCK_VPU>,
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<&clocks BCM2835_CLOCK_DPI>;
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clock-names = "core", "pixel";
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#address-cells = <1>;
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#size-cells = <0>;
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port {
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dpi_out: endpoint@0 {
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remote-endpoint = <&panel_in>;
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};
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};
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};
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v3d: v3d@7ec00000 {
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compatible = "brcm,bcm2835-v3d";
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reg = <0x7ec00000 0x1000>;
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interrupts = <1 10>;
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};
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vc4: gpu {
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compatible = "brcm,bcm2835-vc4";
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};
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panel: panel {
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compatible = "ontat,yx700wv03", "simple-panel";
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port {
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panel_in: endpoint {
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remote-endpoint = <&dpi_out>;
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};
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};
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};
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