linux-kernel - Re: [PATCH v2 1/2] doc: bindings: Add bindings documentation for mtd nvmem

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Message-ID: <20170310063810.2efkb6j2kdgadalv@lukather>
Date:   Fri, 10 Mar 2017 07:38:10 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Marek Vasut <marek.vasut@...il.com>
Cc:     Moritz Fischer <moritz.fischer@...us.com>, Alban <albeu@...e.fr>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Richard Weinberger <richard@....at>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>,
        Devicetree List <devicetree@...r.kernel.org>,
        linux-mtd@...ts.infradead.org
Subject: Re: [PATCH v2 1/2] doc: bindings: Add bindings documentation for mtd
 nvmem

Hi Marek,

On Fri, Mar 10, 2017 at 05:52:36AM +0100, Marek Vasut wrote:
> On 03/10/2017 05:06 AM, Moritz Fischer wrote:
> > On Thu, Mar 9, 2017 at 7:17 PM, Marek Vasut <marek.vasut@...il.com> wrote:
> >> On 03/07/2017 09:26 AM, Alban 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 <albeu@...e.fr>
> >>> ---
> >>> Changelog:
> >>> v2: * Added a "Required properties" section with the nvmem-provider
> >>>       property
> >>> ---
> >>>  .../devicetree/bindings/nvmem/mtd-nvmem.txt        | 33 ++++++++++++++++++++++
> >>>  1 file changed, 33 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..8ed25e6
> >>> --- /dev/null
> >>> +++ b/Documentation/devicetree/bindings/nvmem/mtd-nvmem.txt
> >>> @@ -0,0 +1,33 @@
> >>> += NVMEM in MTD =
> >>> +
> >>> +Config data for drivers, like MAC addresses, is often stored in MTD.
> >>> +This binding define how such data storage 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.
> >>
> >> Why don't we just read the data from MTD and be done with it ? What's
> >> the benefit of complicating things by using nvmem ?
> > 
> > Well because usually stuff like MAC addresses etc are stored in eeproms.
> 
> But eeproms are already supported, see drivers/misc/ .

This the old, free for all, way to support eeproms. We have a proper
framework for them now, and it's called nvmem.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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