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Date:   Fri, 26 Apr 2019 17:41:36 -0500
From:   Rob Herring <robh@kernel.org>
To:     Mason Yang <masonccyang@mxic.com.tw>
Cc:     broonie@kernel.org, marek.vasut@gmail.com,
        linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org,
        bbrezillon@kernel.org, dwmw2@infradead.org, lee.jones@linaro.org,
        mark.rutland@arm.com, computersforpeace@gmal.com,
        paul.burton@mips.com, stefan@agner.ch, christophe.kerello@st.com,
        liang.yang@amlogic.com, geert@linux-m68k.org,
        devicetree@vger.kernel.org, marcel.ziswiler@toradex.com,
        linux-mtd@lists.infradead.org, richard@nod.at,
        miquel.raynal@bootlin.com, juliensu@mxic.com.tw,
        zhengxunli@mxic.com.tw
Subject: Re: [PATCH v3 4/4] dt-bindings: mfd: Document Macronix MX25F0A
 controller bindings
Message-ID: <20190426224136.GA636@bogus>
References: <1555320234-15802-1-git-send-email-masonccyang@mxic.com.tw>
 <1555320234-15802-5-git-send-email-masonccyang@mxic.com.tw>
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On Mon, Apr 15, 2019 at 05:23:54PM +0800, Mason Yang wrote:
> Document the bindings used by the Macronix MX25F0A MFD controller.
> 
> Signed-off-by: Mason Yang <masonccyang@mxic.com.tw>
> ---
>  .../devicetree/bindings/mfd/mxic-mx25f0a.txt       | 51 ++++++++++++++++++++++
>  1 file changed, 51 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mfd/mxic-mx25f0a.txt
> 
> diff --git a/Documentation/devicetree/bindings/mfd/mxic-mx25f0a.txt b/Documentation/devicetree/bindings/mfd/mxic-mx25f0a.txt
> new file mode 100644
> index 0000000..7f3e0f8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/mxic-mx25f0a.txt
> @@ -0,0 +1,51 @@
> +Macronix MX25F0A MultiFunction Device Tree Bindings
> +----------------------------------------------------
> +
> +MX25F0A is a MultiFunction Device with SPI and raw NAND, which
> +supports either spi host controller or raw nand controller.
> +
> +Required properties:
> +- compatible: should be "mxic,mx25f0a"
> +- #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 in SPI mode.
> +- reg-names: should contain "regs" and "dirmap"
> +- interrupts: interrupt line connected to this MFD controller
> +- SPI controller driver:
> +		- clock-names: should contain "ps_clk", "send_clk" and
> +			       "send_dly_clk"
> +		- clocks: should contain 3 entries for the "ps_clk", "send_clk"
> +			  and "send_dly_clk" clocks
> +
> +- Raw nand controller driver.
> +		- nand-ecc-mode = "soft";
> +		- nand-ecc-algo = "bch";
> +
> +Example:
> +
> +	mxic: mx25f0a@43c30000 {
> +		compatible = "mxic,mx25f0a";
> +		reg = <0x43c30000 0x10000>, <0xa0000000 0x4000000>;
> +		reg-names = "regs", "dirmap";
> +
> +		/* spi */
> +		clocks = <&clkwizard 0>, <&clkwizard 1>, <&clkc 15>;
> +		clock-names = "send_clk", "send_dly_clk", "ps_clk";
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		flash@0 {
> +			compatible = "jedec,spi-nor";
> +			reg = <0>;
> +			spi-max-frequency = <25000000>;
> +			spi-tx-bus-width = <4>;
> +			spi-rx-bus-width = <4>;
> +		};
> +
> +		/* nand */

Don't you need a nand child node? I'm not sure how that's going to work 
as you are already using the number space (i.e. reg) for SPI CS number 
and you can't really mix number spaces within a node level.

> +		nand-ecc-mode = "soft";
> +		nand-ecc-algo = "bch";
> +		nand-ecc-step-size = <512>;
> +		nand-ecc-strength = <8>;
> +	};
> -- 
> 1.9.1
>