[v3,10/14] dt-bindings: media: Document bindings for the Sunxi-Cedrus VPU driver

Commit Message

Paul Kocialkowski May 7, 2018, 12:44 p.m. UTC

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 <[e-mail]>
---
 .../devicetree/bindings/media/sunxi-cedrus.txt     | 58 ++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/sunxi-cedrus.txt

Comments

Rob Herring (Arm) May 7, 2018, 2:18 p.m. UTC | #1

On Mon, May 07, 2018 at 02:44:56PM +0200, Paul Kocialkowski wrote:
> 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 <[e-mail]>
> ---
>  .../devicetree/bindings/media/sunxi-cedrus.txt     | 58 ++++++++++++++++++++++
>  1 file changed, 58 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/sunxi-cedrus.txt

Reviewed-by: Rob Herring <[e-mail]>

Patch

diff --git a/Documentation/devicetree/bindings/media/sunxi-cedrus.txt b/Documentation/devicetree/bindings/media/sunxi-cedrus.txt
new file mode 100644
index 000000000000..4c3f2b596ded
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/sunxi-cedrus.txt
@@ -0,0 +1,58 @@ 
+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		: must be one of the following compatibles:
+			- "allwinner,sun4i-a10-video-engine"
+			- "allwinner,sun5i-a13-video-engine"
+			- "allwinner,sun7i-a20-video-engine"
+			- "allwinner,sun8i-a33-video-engine"
+- reg			: register base and length of VE;
+- 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		: VE interrupt number;
+- allwinner,sram	: SRAM region to use with the VE.
+
+Optional properties:
+- memory-region		: CMA pool to use for buffers allocation instead of the
+			  default CMA pool.
+
+Example:
+
+reserved-memory {
+	#address-cells = <1>;
+	#size-cells = <1>;
+	ranges;
+
+	/* Address must be kept in the lower 256 MiBs of DRAM for VE. */
+	cma_pool: cma@4a000000 {
+		compatible = "shared-dma-pool";
+		size = <0x6000000>;
+		alloc-ranges = <0x4a000000 0x6000000>;
+		reusable;
+		linux,cma-default;
+	};
+};
+
+video-codec@1c0e000 {
+	compatible = "allwinner,sun7i-a20-video-engine";
+	reg = <0x01c0e000 0x1000>;
+
+	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>;
+	allwinner,sram = <&ve_sram 1>;
+};