Document the bindings used by the Renesas R-Car Gen3 RPC-IF controller.
Signed-off-by: Mason Yang <masonccyang@xxxxxxxxxxx>
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.../devicetree/bindings/spi/spi-renesas-rpc.txt | 46 ++++++++++++++++++++++
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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
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+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, i.e.,
+ "renesas,r8a77995-rpc", "renesas,rcar-gen3-rpc".
+ "renesas,r8a7795-rpc" (R-Car H3)
+ "renesas,r8a7796-rpc" (R-Car M3-W)
+ "renesas,r8a77965-rpc" (R-Car M3-N)
+ "renesas,r8a77970-rpc" (R-Car V3M)
+ "renesas,r8a77980-rpc" (R-Car V3H)
+ "renesas,r8a77990-rpc" (R-Car E3)
+ "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>;
+ };
+ };
--
1.9.1
