linux-kernel - Re: [PATCH v6 2/2] mtd: nand: add sunxi NFC dt bindings doc

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Date:	Mon, 20 Oct 2014 19:41:34 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	linux-mtd@...ts.infradead.org, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org,
	linux-sunxi@...glegroups.com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Yassin Jaffer <yassinjaffer@...il.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>
Subject: Re: [PATCH v6 2/2] mtd: nand: add sunxi NFC dt bindings doc

Hi Boris,

On Mon, Oct 20, 2014 at 01:45:20PM +0200, Boris Brezillon wrote:
> Add the sunxi NAND Flash Controller dt bindings documentation.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> ---
>  .../devicetree/bindings/mtd/sunxi-nand.txt         | 45 ++++++++++++++++++++++
>  1 file changed, 45 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mtd/sunxi-nand.txt
> 
> diff --git a/Documentation/devicetree/bindings/mtd/sunxi-nand.txt b/Documentation/devicetree/bindings/mtd/sunxi-nand.txt
> new file mode 100644
> index 0000000..0273adb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/sunxi-nand.txt
> @@ -0,0 +1,45 @@
> +Allwinner NAND Flash Controller (NFC)
> +
> +Required properties:
> +- compatible : "allwinner,sun4i-a10-nand".
> +- reg : shall contain registers location and length for data and reg.
> +- interrupts : shall define the nand controller interrupt.
> +- #address-cells: shall be set to 1. Encode the nand CS.
> +- #size-cells : shall be set to 0.
> +- clocks : shall reference nand controller clocks.
> +- clock-names : nand controller internal clock names. Shall contain :
> +    * "ahb" : AHB gating clock
> +    * "mod" : nand controller clock
> +
> +Optional children nodes:
> +Children nodes represent the available nand chips.
> +
> +Optional properties:
> +- allwinner,rb : shall contain the native Ready/Busy ids.
> + or
> +- rb-gpios : shall contain the gpios used as R/B pins.

I think you're relying on a named GPIO in your driver ("nand-rb"). That
should be documented here.

> +- nand-ecc-mode : one of the supported ECC modes ("hw", "hw_syndrome", "soft",
> +  "soft_bch" or "none")

I think you're utilizing an undocumented 'nand-name' property for this
node in your driver too. Please document it. (That also goes for any
other undocumented properties I may have missed.)

> +
> +see Documentation/devicetree/mtd/nand.txt for generic bindings.
> +
> +
> +Examples:
> +nfc: nand@...03000 {
> +	compatible = "allwinner,sun4i-a10-nand";
> +	reg = <0x01c03000 0x1000>;
> +	interrupts = <0 37 1>;
> +	clocks = <&ahb_gates 13>, <&nand_clk>;
> +	clock-names = "ahb", "mod";
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&nand_pins_a &nand_cs0_pins_a &nand_rb0_pins_a>;
> +	status = "okay";
> +
> +	nand@0 {
> +		reg = <0>;
> +		allwinner,rb = <0>;
> +		nand-ecc-mode = "soft_bch";
> +	};
> +};

Brian
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