1Broadcom VC4 (VideoCore4) GPU
2
3The VC4 device present on the Raspberry Pi includes a display system
4with HDMI output and the HVS (Hardware Video Scaler) for compositing
5display planes.
6
7Required properties for VC4:
8- compatible:	Should be "brcm,bcm2835-vc4"
9
10Required properties for Pixel Valve:
11- compatible:	Should be one of "brcm,bcm2835-pixelvalve0",
12		  "brcm,bcm2835-pixelvalve1", or "brcm,bcm2835-pixelvalve2"
13- reg:		Physical base address and length of the PV's registers
14- interrupts:	The interrupt number
15		  See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
16
17Required properties for HVS:
18- compatible:	Should be "brcm,bcm2835-hvs"
19- reg:		Physical base address and length of the HVS's registers
20- interrupts:	The interrupt number
21		  See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
22
23Required properties for HDMI
24- compatible:	Should be "brcm,bcm2835-hdmi"
25- reg:		Physical base address and length of the two register ranges
26		  ("HDMI" and "HD", in that order)
27- interrupts:	The interrupt numbers
28		  See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
29- ddc:		phandle of the I2C controller used for DDC EDID probing
30- clocks:	a) hdmi: The HDMI state machine clock
31		b) pixel: The pixel clock.
32
33Optional properties for HDMI:
34- hpd-gpios:	The GPIO pin for HDMI hotplug detect (if it doesn't appear
35		  as an interrupt/status bit in the HDMI controller
36		  itself).  See bindings/pinctrl/brcm,bcm2835-gpio.txt
37
38Example:
39pixelvalve@7e807000 {
40	compatible = "brcm,bcm2835-pixelvalve2";
41	reg = <0x7e807000 0x100>;
42	interrupts = <2 10>; /* pixelvalve */
43};
44
45hvs@7e400000 {
46	compatible = "brcm,bcm2835-hvs";
47	reg = <0x7e400000 0x6000>;
48	interrupts = <2 1>;
49};
50
51hdmi: hdmi@7e902000 {
52	compatible = "brcm,bcm2835-hdmi";
53	reg = <0x7e902000 0x600>,
54	      <0x7e808000 0x100>;
55	interrupts = <2 8>, <2 9>;
56	ddc = <&i2c2>;
57	hpd-gpios = <&gpio 46 GPIO_ACTIVE_HIGH>;
58	clocks = <&clocks BCM2835_PLLH_PIX>,
59		 <&clocks BCM2835_CLOCK_HSM>;
60	clock-names = "pixel", "hdmi";
61};
62
63vc4: gpu {
64	compatible = "brcm,bcm2835-vc4";
65};
66