linux-kernel - Re: [PATCH v3 2/3] doc: bindings: Add bindings documentation for mtd nvmem

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Message-ID: <20180416210851.shu73nlincslxlde@rob-hp-laptop>
Date:   Mon, 16 Apr 2018 16:08:51 -0500
From:   Rob Herring <robh@...nel.org>
To:     Alban Bedel <albeu@...e.fr>
Cc:     linux-kernel@...r.kernel.org,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        devicetree@...r.kernel.org, linux-mtd@...ts.infradead.org
Subject: Re: [PATCH v3 2/3] doc: bindings: Add bindings documentation for mtd
 nvmem

On Sun, Mar 25, 2018 at 12:24:58AM +0100, Alban Bedel wrote:
> Config data for drivers, like MAC addresses, is often stored in MTD.
> Add a binding that define how such data storage can be represented in
> device tree.
> 
> Signed-off-by: Alban Bedel <albeu@...e.fr>
> ---
> Changelog:
> v2: * Added a "Required properties" section with the nvmem-provider
>       property
> v3: * Fixed my name in From and Signed-off-by
>     * Moved to the new nvmem binding with the nvmem-cells subnode
> ---
>  .../devicetree/bindings/nvmem/mtd-nvmem.txt        | 27 ++++++++++++++++++++++
>  1 file changed, 27 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/nvmem/mtd-nvmem.txt
> 
> diff --git a/Documentation/devicetree/bindings/nvmem/mtd-nvmem.txt b/Documentation/devicetree/bindings/nvmem/mtd-nvmem.txt
> new file mode 100644
> index 0000000..c819a69
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/nvmem/mtd-nvmem.txt
> @@ -0,0 +1,27 @@
> += NVMEM in MTD =
> +
> +Config data for drivers, like MAC addresses, is often stored in MTD.
> +An MTD device, or one of its partition, can be defined as a NVMEM provider
> +by having an 'nvmem-cells' subnode as defined in nvmem.txt.
> +
> +Example:
> +
> +	flash@0 {
> +		...
> +
> +		partition@2 {

This unit address is not correct...

> +			label = "art";
> +			reg = <0x7F0000 0x010000>;

Lowercase hex.

> +			read-only;
> +
> +			nvmem-cells {
> +				compatible = "nvmem-cells";
> +				#address-cells = <1>;
> +				#size-cells = <1>;
> +
> +				eeprom@...0 {

"eeprom" isn't specific data. The purpose of the nvmem binding is to 
provide specific data fields like MAC addresseses.

Plus "eeprom" is the node name for EEPROM devices.

> +					reg = <0x1000 0x1000>;
> +				};
> +			};
> +		};
> +	};
> -- 
> 2.7.4
>