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Unverified Commit a6e3ab0b authored by Icenowy Zheng's avatar Icenowy Zheng Committed by Maxime Ripard
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dt-bindings: add binding for the Allwinner A64 DE2 bus 



All the sub-blocks of Allwinner A64 DE2 needs the SRAM C on A64 SoC to
be claimed, otherwise the whole DE2 space is inaccessible.

Add a device tree binding of the DE2 part as a sub-bus.

Reviewed-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarIcenowy Zheng <icenowy@aosc.io>
Signed-off-by: default avatarMaxime Ripard <maxime.ripard@bootlin.com>
parent ede18ae3

Documentation/devicetree/bindings/bus/sun50i-de2-bus.txt

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+37 −0
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Device tree bindings for Allwinner A64 DE2 bus



The Allwinner A64 DE2 is on a special bus, which needs a SRAM region (SRAM C)

to be claimed for enabling the access.



Required properties:



 - compatible:		Should contain "allwinner,sun50i-a64-de2"

 - reg:			A resource specifier for the register space

 - #address-cells:	Must be set to 1

 - #size-cells:		Must be set to 1

 - ranges:		Must be set up to map the address space inside the

			DE2, for the sub-blocks of DE2.

 - allwinner,sram:	the SRAM that needs to be claimed



Example:



	de2@1000000 {

		compatible = "allwinner,sun50i-a64-de2";

		reg = <0x1000000 0x400000>;

		allwinner,sram = <&de2_sram 1>;

		#address-cells = <1>;

		#size-cells = <1>;

		ranges = <0 0x1000000 0x400000>;



		display_clocks: clock@0 {

			compatible = "allwinner,sun50i-a64-de2-clk";

			reg = <0x0 0x100000>;

			clocks = <&ccu CLK_DE>,

				 <&ccu CLK_BUS_DE>;

			clock-names = "mod",

				      "bus";

			resets = <&ccu RST_BUS_DE>;

			#clock-cells = <1>;

			#reset-cells = <1>;

		};

	};