linux-kernel - Re: [PATCH v2 06/29] mtd: Add support for reading MTD devices via the nvmem API

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Date:   Thu, 23 Aug 2018 12:29:21 +0200
From:   Alban <albeu@...e.fr>
To:     Boris Brezillon <boris.brezillon@...tlin.com>
Cc:     Alban Bedel <albeu@...e.fr>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Jonathan Corbet <corbet@....net>, Sekhar Nori <nsekhar@...com>,
        Kevin Hilman <khilman@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Grygorii Strashko <grygorii.strashko@...com>,
        "David S . Miller" <davem@...emloft.net>,
        Naren <naren.kernel@...il.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Lukas Wunner <lukas@...ner.de>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>,
        Sven Van Asbroeck <svendev@...x.com>,
        Paolo Abeni <pabeni@...hat.com>, Rob Herring <robh@...nel.org>,
        David Lechner <david@...hnology.com>,
        Andrew Lunn <andrew@...n.ch>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-i2c@...r.kernel.org, linux-mtd@...ts.infradead.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v2 06/29] mtd: Add support for reading MTD devices via
 the nvmem API

On Tue, 21 Aug 2018 15:01:21 +0200
Boris Brezillon <boris.brezillon@...tlin.com> wrote:

> On Tue, 21 Aug 2018 13:00:04 +0100
> Srinivas Kandagatla <srinivas.kandagatla@...aro.org> wrote:
> 
> > On 21/08/18 12:39, Alban wrote:  
> > > However we still have the a potential address space clash between
> > > the nvmem cells and the main device binding.    
> > Can you elaborate?
> >   
> 
> Yes, I'd be interested in having a real example too, cause I don't see
> what this address space clash is.

Let say I have a device that use the following binding:

device {
    compatible = "example-device";
    #address-cells = <2>;
    #size-cells = <1>;

    child@0,0 {
        reg = <0x0 0x0>;
        ...
    };

    child@1,2 {
        reg = <0x1 0x2>;
        ...
    };

};

Now this binding already use the node address space for something,
so putting a nvmem node as direct child would not work. Here it is
quiet clear as we have 2 address cells, however even if the number of
cells and the cells size would match it would still be conceptually
wrong as both bindings then use the same address space for something
different.

Alban

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