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

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Message-ID: <20180417144457.2831140e@avionic-0020>
Date:   Tue, 17 Apr 2018 14:44:57 +0200
From:   Alban <albeu@...e.fr>
To:     Rob Herring <robh@...nel.org>
Cc:     Alban <albeu@...e.fr>, 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 Mon, 16 Apr 2018 16:08:51 -0500
Rob Herring <robh@...nel.org> wrote:

> 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...

Is it because I ellipsed the #address-cells and #size-cells? I will add
them.
 
> > +			label = "art";
> > +			reg = <0x7F0000 0x010000>;  
> 
> Lowercase hex.

Will do.

> > +			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.

This example is from a board using an ath9k chip and this field contains
what the driver names EEPROM, although it is in fact only a config
binary blob. However I agree that it is misleading for such an example,
I will replace it with something like "wifi-config-data".

Alban

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