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

Signed-off-by: Mason Yang <masonccy...@mxic.com.tw>
Reviewed-by: Rob Herring <r...@kernel.org>
---
 .../devicetree/bindings/spi/spi-renesas-rpc.txt    | 46 ++++++++++++++++++++++
 1 file changed, 46 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 0000000..d929850
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi-renesas-rpc.txt
@@ -0,0 +1,46 @@
+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,r8a77980-rpc"  (R-Car V3H)
+               "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 the clock phandle/specifier pair for the module clock.
+- clock-names: should contain "rpc"
+- power-domains: should contain the power domain phandle/secifier pair.
+- resets: should contain the reset controller phandle/specifier pair.
+- #address-cells: should be 1
+- #size-cells: should be 0
+- flash: should be represented by a subnode of the RPC-IF node,
+        which "compatible" property contains "jedec,spi-nor", it presents
+        SPI is used.
+
+Example:
+
+       rpc: spi@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

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