On Wed, Apr 24, 2019 at 03:55:36PM +0800, Mason Yang wrote:
> Document the bindings used by the Renesas R-Car Gen3 RPC-IF MFD.
>
> Signed-off-by: Mason Yang <masonccyang@xxxxxxxxxxx>
> ---
> .../devicetree/bindings/mfd/mfd-renesas-rpc.txt | 40 ++++++++++++++++++++++
> 1 file changed, 40 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..668b822
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/mfd-renesas-rpc.txt
> @@ -0,0 +1,40 @@
> +Renesas R-Car Gen3 RPC-IF MFD Device Tree Bindings
> +--------------------------------------------------
Looks like a SPI flash controller from the example. What makes it an
MFD?
> +
> +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-if@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
>
