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[v2,2/7] dt-bindings: add binding for the Allwinner A64 DE2 bus

Message ID 20180622124540.56203-1-icenowy@aosc.io (mailing list archive)
State New, archived
Headers show

Commit Message

Icenowy Zheng June 22, 2018, 12:45 p.m. UTC 
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.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
No changes since v1.

 .../bindings/bus/sun50i-de2-bus.txt           | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/bus/sun50i-de2-bus.txt

Comments

Rob Herring (Arm) June 25, 2018, 8:18 p.m. UTC | #1 
On Fri, Jun 22, 2018 at 08:45:35PM +0800, Icenowy Zheng wrote:
> 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.
> 
> Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
> ---
> No changes since v1.
> 
>  .../bindings/bus/sun50i-de2-bus.txt           | 37 +++++++++++++++++++
>  1 file changed, 37 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/bus/sun50i-de2-bus.txt

Reviewed-by: Rob Herring <robh@kernel.org>
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Patch

diff --git a/Documentation/devicetree/bindings/bus/sun50i-de2-bus.txt b/Documentation/devicetree/bindings/bus/sun50i-de2-bus.txt
new file mode 100644
index 000000000000..87dfb33fb3be
--- /dev/null
+++ b/Documentation/devicetree/bindings/bus/sun50i-de2-bus.txt
@@ -0,0 +1,37 @@ 
+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>;
+		};
+	};