linux-kernel - Re: [PATCH v2 2/2] dt-binding: spi: Document Renesas R-Car Gen3 RPC controller bindings

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Date:   Tue, 4 Dec 2018 19:19:48 +0100
From:   Marek Vasut <marek.vasut@...il.com>
To:     Mason Yang <masonccyang@...c.com.tw>, broonie@...nel.org,
        linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
        boris.brezillon@...tlin.com, linux-renesas-soc@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     juliensu@...c.com.tw, Simon Horman <horms@...ge.net.au>,
        zhengxunli@...c.com.tw
Subject: Re: [PATCH v2 2/2] dt-binding: spi: Document Renesas R-Car Gen3 RPC
 controller bindings

On 12/03/2018 10:18 AM, Mason Yang wrote:
> Document the bindings used by the Renesas R-Car Gen3 RPC SPI controller.

RPC is SPI and HF controller, it is not a pure SPI controller.

How does this deal with the HF part ? Keep in mind the bindings are ABI
and it will be difficult to redo them later.

> Signed-off-by: Mason Yang <masonccyang@...c.com.tw>
> ---
>  .../devicetree/bindings/spi/spi-renesas-rpc.txt    | 35 ++++++++++++++++++++++
>  1 file changed, 35 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..c6c6d9c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/spi/spi-renesas-rpc.txt
> @@ -0,0 +1,35 @@
> +Renesas R-Car Gen3 RPC controller Device Tree Bindings
> +------------------------------------------------------
> +
> +Required properties:
> +- compatible: should be "renesas,r8a77995-rpc"
> +- #address-cells: should be 1
> +- #size-cells: should be 0
> +- reg: should contain 2 entries, one for the registers and one for the direct
> +       mapping area
> +- reg-names: should contain "rpc_regs" and "dirmap"
> +- interrupts: interrupt line connected to the RPC SPI controller

Not a SPI controller.

> +- clock-names: should contain "clk_rpc"
> +- clocks: should contain 1 entries for the module's clock
> +
> +Example:
> +
> +	rpc: spi@...00000 {
> +		compatible = "renesas,r8a77995-rpc";
> +		reg = <0 0xee200000 0 0x8100>, <0 0x08000000 0 0x4000000>;
> +		reg-names = "rpc_regs", "dirmap";
> +		clocks = <&cpg CPG_MOD 917>;
> +		power-domains = <&sysc R8A77995_PD_ALWAYS_ON>;
> +		resets = <&cpg 917>;
> +		clock-names = "clk_rpc";
> +		#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>;
> +		};
> +	};
> 


-- 
Best regards,
Marek Vasut