linux-kernel - Re: [PATCH 1/3] doc: bindings: Add bindings documentation for mtd nvmem

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Message-ID: <20170302212220.4c3c7bef@bbrezillon>
Date:   Thu, 2 Mar 2017 21:22:20 +0100
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Alban <albeu@...e.fr>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-mtd@...ts.infradead.org,
        Cyrille Pitchen <cyrille.pitchen@...el.com>,
        Richard Weinberger <richard@....at>,
        Marek Vasut <marek.vasut@...il.com>,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Moritz Fischer <moritz.fischer@...us.com>
Subject: Re: [PATCH 1/3] doc: bindings: Add bindings documentation for mtd
 nvmem

On Thu,  2 Mar 2017 20:50:21 +0100
Alban <albeu@...e.fr> wrote:

> Add the binding to expose MTD partitions as nvmem providers.

Looks good. Maybe you should take the case you describe in your
cover-letter into account and add an extra layer: add an nvmem sub-node
containing the nvmem cells, so that you can expose nvmem cells directly
under master MTD devices (and not only partitions). 

> 
> Signed-off-by: Alban <albeu@...e.fr>
> ---
>  .../devicetree/bindings/nvmem/mtd-nvmem.txt        | 29 ++++++++++++++++++++++
>  1 file changed, 29 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..47602f7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/nvmem/mtd-nvmem.txt
> @@ -0,0 +1,29 @@
> += NVMEM in MTD =
> +
> +Config data for drivers is often stored in MTD devices. This binding
> +define how such data can be represented in device tree.
> +
> +An MTD can be defined as an NVMEM provider by adding the `nvmem-provider`
> +property to their node. Data cells can then be defined as child nodes
> +of the partition as defined in nvmem.txt.
> +
> +Example:
> +
> +	flash@0 {
> +		...
> +
> +		partition@2 {
> +			label = "art";
> +			reg = <0x7F0000 0x010000>;
> +			read-only;
> +
> +			nvmem-provider;
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +
> +			eeprom@...0 {
> +				label = "wmac-eeprom";
> +				reg = <0x1000 0x1000>;
> +			};
> +		};
> +	};