tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1Device-tree bindings for the VPU found in Allwinner SoCs, referred to as the
2Video Engine (VE) in Allwinner literature.
3
4The VPU can only access the first 256 MiB of DRAM, that are DMA-mapped starting
5from the DRAM base. This requires specific memory allocation and handling.
6
7Required properties:
8- compatible : must be one of the following compatibles:
9 - "allwinner,sun4i-a10-video-engine"
10 - "allwinner,sun5i-a13-video-engine"
11 - "allwinner,sun7i-a20-video-engine"
12 - "allwinner,sun8i-a33-video-engine"
13 - "allwinner,sun8i-h3-video-engine"
14 - "allwinner,sun50i-a64-video-engine"
15 - "allwinner,sun50i-h5-video-engine"
16 - "allwinner,sun50i-h6-video-engine"
17- reg : register base and length of VE;
18- clocks : list of clock specifiers, corresponding to entries in
19 the clock-names property;
20- clock-names : should contain "ahb", "mod" and "ram" entries;
21- resets : phandle for reset;
22- interrupts : VE interrupt number;
23- allwinner,sram : SRAM region to use with the VE.
24
25Optional properties:
26- memory-region : CMA pool to use for buffers allocation instead of the
27 default CMA pool.
28
29Example:
30
31reserved-memory {
32 #address-cells = <1>;
33 #size-cells = <1>;
34 ranges;
35
36 /* Address must be kept in the lower 256 MiBs of DRAM for VE. */
37 cma_pool: default-pool {
38 compatible = "shared-dma-pool";
39 size = <0x6000000>;
40 alloc-ranges = <0x4a000000 0x6000000>;
41 reusable;
42 linux,cma-default;
43 };
44};
45
46video-codec@1c0e000 {
47 compatible = "allwinner,sun7i-a20-video-engine";
48 reg = <0x01c0e000 0x1000>;
49
50 clocks = <&ccu CLK_AHB_VE>, <&ccu CLK_VE>,
51 <&ccu CLK_DRAM_VE>;
52 clock-names = "ahb", "mod", "ram";
53
54 resets = <&ccu RST_VE>;
55 interrupts = <GIC_SPI 53 IRQ_TYPE_LEVEL_HIGH>;
56 allwinner,sram = <&ve_sram 1>;
57};