[PATCH] dt-bindings: spi: Document Renesas R-Car Gen3 RPC-IF controller bindings

[Mason Yang]

Document the bindings used by the Renesas R-Car Gen3 RPC-IF controller.

Signed-off-by: Mason Yang <masonccyang@xxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
 .../bindings/spi/spi-renesas-rpc.txt          | 40 +++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/spi-renesas-rpc.txt

diff --git a/Documentation/devicetree/bindings/spi/spi-renesas-rpc.txt b/Documentation/devicetree/bindings/spi/spi-renesas-rpc.txt
new file mode 100644
index 000000000000..7dff7e7bea97
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi-renesas-rpc.txt
@@ -0,0 +1,40 @@
+Renesas R-Car Gen3 RPC-IF controller Device Tree Bindings
+--------------------------------------------------------------------
+
+Required properties:
+- compatible: should be an SoC-specific compatible value, followed by
+		"renesas,rcar-gen3-rpc" as a fallback.
+		supported SoC-specific values are:
+		"renesas,r8a77995-rpc"	(R-Car D3)
+- reg: should contain three register areas:
+	first for the base address of rpc-if registers,
+	second for the direct mapping read mode and
+	third for the write buffer area.
+- reg-names: should contain "regs", "dirmap" and "wbuf"
+- clocks: should contain 1 entries for the module's clock
+- clock-names: should contain "rpc"
+- #address-cells: should be 1
+- #size-cells: should be 0
+
+Example:
+
+	rpc: rpc@ee200000 {
+		compatible = "renesas,r8a77995-rpc", "renesas,rcar-gen3-rpc";
+		reg = <0 0xee200000 0 0x200>, <0 0x08000000 0 0x4000000>,
+		      <0 0xee208000 0 0x100>;
+		reg-names = "regs", "dirmap", "wbuf";
+		clocks = <&cpg CPG_MOD 917>;
+		clock-names = "rpc";
+		power-domains = <&sysc R8A77995_PD_ALWAYS_ON>;
+		resets = <&cpg 917>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		flash@0 {
+			compatible = "jedec,spi-nor";
+			reg = <0>;
+			spi-max-frequency = <40000000>;
+			spi-tx-bus-width = <1>;
+			spi-rx-bus-width = <1>;
+		};
+	};
-- 
2.20.1