This adds a device-tree binding document that specifies the properties
used by the Sunxi-Cedurs VPU driver, as well as examples.

Signed-off-by: Paul Kocialkowski <paul.kocialkow...@bootlin.com>
---
 .../devicetree/bindings/media/sunxi-cedrus.txt     | 50 ++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/sunxi-cedrus.txt

diff --git a/Documentation/devicetree/bindings/media/sunxi-cedrus.txt 
b/Documentation/devicetree/bindings/media/sunxi-cedrus.txt
new file mode 100644
index 000000000000..71ad3f9c3352
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/sunxi-cedrus.txt
@@ -0,0 +1,50 @@
+Device-tree bindings for the VPU found in Allwinner SoCs, referred to as the
+Video Engine (VE) in Allwinner literature.
+
+The VPU can only access the first 256 MiB of DRAM, that are DMA-mapped starting
+from the DRAM base. This requires specific memory allocation and handling.
+
+Required properties:
+- compatible           : "allwinner,sun4i-a10-video-engine";
+- memory-region         : DMA pool for buffers allocation;
+- clocks               : list of clock specifiers, corresponding to entries in
+                          the clock-names property;
+- clock-names          : should contain "ahb", "mod" and "ram" entries;
+- assigned-clocks       : list of clocks assigned to the VE;
+- assigned-clocks-rates : list of clock rates for the clocks assigned to the 
VE;
+- resets               : phandle for reset;
+- interrupts           : should contain VE interrupt number;
+- reg                  : should contain register base and length of VE.
+
+Example:
+
+reserved-memory {
+       #address-cells = <1>;
+       #size-cells = <1>;
+       ranges;
+
+       /* Address must be kept in the lower 256 MiBs of DRAM for VE. */
+       ve_memory: cma@4a000000 {
+               compatible = "shared-dma-pool";
+               reg = <0x4a000000 0x6000000>;
+               no-map;
+               linux,cma-default;
+       };
+};
+
+video-engine@1c0e000 {
+       compatible = "allwinner,sun4i-a10-video-engine";
+       reg = <0x01c0e000 0x1000>;
+       memory-region = <&ve_memory>;
+
+       clocks = <&ccu CLK_AHB_VE>, <&ccu CLK_VE>,
+                <&ccu CLK_DRAM_VE>;
+       clock-names = "ahb", "mod", "ram";
+
+       assigned-clocks = <&ccu CLK_VE>;
+       assigned-clock-rates = <320000000>;
+
+       resets = <&ccu RST_VE>;
+
+       interrupts = <GIC_SPI 53 IRQ_TYPE_LEVEL_HIGH>;
+};
-- 
2.16.3

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