[PATCH v9 3/3] dt-bindings: mfd: Document Renesas R-Car Gen3 RPC-IF controller bindings

[Mason Yang]

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

Signed-off-by: Mason Yang <masonccyang@xxxxxxxxxxx>
---
 .../devicetree/bindings/mfd/mfd-renesas-rpc.txt    | 57 ++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/mfd-renesas-rpc.txt

diff --git a/Documentation/devicetree/bindings/mfd/mfd-renesas-rpc.txt b/Documentation/devicetree/bindings/mfd/mfd-renesas-rpc.txt
new file mode 100644
index 0000000..577986b
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/mfd-renesas-rpc.txt
@@ -0,0 +1,57 @@
+Renesas R-Car Gen3 RPC-IF MFD 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
+
+Required nodes:
+	spi:
+	Node for configuring the SPI controller driver.
+	Required properties:
+		compatible = "renesas,rcar-rpc-spi";
+
+	hf:
+	Node for configuring the hyperflash controller driver.
+	Required properties:
+		compatible = "renesas,rcar-rpc-hf";
+
+Example:
+
+	rpc_mfd: rpc-mfd@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>;
+
+		spi {
+			compatible = "renesas,rcar-rpc-spi";
+			#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>;
+			};
+		};
+	};
-- 
1.9.1