linux-kernel - Re: [PATCH 3/3] mtd: spi-nand: add devicetree binding

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Message-ID: <20150108143542.GF10537@leverpostej>
Date:	Thu, 8 Jan 2015 14:35:42 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Peter Pan 潘栋 (peterpandong) 
	<peterpandong@...ron.com>
Cc:	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	Ezequiel Garcia <ezequiel.garcia@...tec.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Qi Wang 王起 (qiwang) <qiwang@...ron.com>,
	Frank Liu 刘群 (frankliu) 
	<frankliu@...ron.com>,
	Melanie Zhang 张燕 (melaniezhang) 
	<melaniezhang@...ron.com>
Subject: Re: [PATCH 3/3] mtd: spi-nand: add devicetree binding

On Thu, Jan 08, 2015 at 12:52:26AM +0000, Peter Pan 潘栋 (peterpandong) wrote:
> This commit adds the devicetree binding document that specifies the
> spi nand devices support.
> 
> Signed-off-by: Peter Pan <peterpandong@...ron.com>
> ---
>  Documentation/devicetree/bindings/mtd/spi-nand.txt | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mtd/spi-nand.txt
> 
> diff --git a/Documentation/devicetree/bindings/mtd/spi-nand.txt b/Documentation/devicetree/bindings/mtd/spi-nand.txt
> new file mode 100644
> index 0000000..9dd3efd
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/spi-nand.txt
> @@ -0,0 +1,22 @@
> +* NAND driver for MT29F, GD5F and similar SPI NAND flash chips
> +
> +Required properties:
> +- #address-cells, #size-cells : Must be present if the device has sub-nodes
> +  representing partitions.

Can we refer to the binding document for that?

> +- compatible : Should be the manufacturer and the name of the chip. Bear in mind
> +               the DT binding is not Linux-only, but in case of Linux, see the
> +               "spi_nand_id_table" array in drivers/mtd/spi-nand/spi-nand-device.c
> +               for the list of supported chips.

NAK for referring to Linux internals from a binding document.

The list of compatible string should be defined in this binding
document.

> +- reg : Chip-Select number
> +- spi-max-frequency : Maximum frequency of the SPI bus the chip can operate at
> +
> +Example:
> +
> +	flash: flash@0 {
> +		#address-cells = <1>;
> +		#size-cells = <1>;

These aren't necessary as no partitions are defined here.

Otherwise, this looks ok.

Thanks,
Mark.

> +		compatible = "micron,mt29f";
> +		reg = <0>;
> +		spi-max-frequency = <50000000>;
> +	};
> +
> -- 
> 1.9.1
> N嫥叉靣笡y氊b瞂千v豝?藓{.n?壏漽鴾z谵z)韰骅w*.jg?秹殠娸/侁鋤罐枈?娹櫒璀??摺玜囤.瓽珴閔?鎗:+v墾妛鑶佶
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