On 4/24/19 11:23 PM, Rob Herring wrote:
> 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?
It supports both SPI NOR and HyperFlash (CFI-compliant flash with
different bus interface).
>> +
>> +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
>>
--
Best regards,
Marek Vasut
