[PATCH 2/7] dt-bindings: add binding for the Allwinner A64 DE2 bus
From: Icenowy Zheng <hidden>
Date: 2018-03-16 17:55:50
Also in:
linux-arm-kernel, linux-clk, lkml
Subsystem:
open firmware and flattened device tree bindings, the rest · Maintainers:
Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
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 <redacted> --- .../devicetree/bindings/bus/sun50i-de2-bus.txt | 37 ++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 Documentation/devicetree/bindings/bus/sun50i-de2-bus.txt
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>; + }; + };
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2.15.1