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linux-next/Documentation/devicetree/bindings/display/brcm,bcm-vc4.txt
Eric Anholt b3f7787b46 drm/vc4: Add specific compatible strings for Cygnus.
Cygnus has V3D 2.6 instead of 2.1, and doesn't use the VC4 display
modules.  The V3D can be uniquely identified by the IDENT[01]
registers, and there's nothing to key off of for the display change
other than the lack of DT nodes for the display components, but it's
convention to have new compatible strings anyway.

Signed-off-by: Eric Anholt <eric@anholt.net>
Acked-by: Rob Herring <robh@kernel.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170428224223.21904-3-eric@anholt.net
2017-05-08 12:24:06 -07:00

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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>;
};
};
};