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

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Message-ID: <CAMRc=McwEjofZKP93DxPa8vJLE6NceLLGfcbcK9-Pfk-dav_Zg@mail.gmail.com>
Date:   Mon, 20 Aug 2018 20:50:55 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Boris Brezillon <boris.brezillon@...tlin.com>
Cc:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Alban <albeu@...e.fr>, 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 <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        "open list:MEMORY TECHNOLOGY..." <linux-mtd@...ts.infradead.org>,
        Linux-OMAP <linux-omap@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v2 06/29] mtd: Add support for reading MTD devices via the
 nvmem API

2018-08-20 20:20 GMT+02:00 Boris Brezillon <boris.brezillon@...tlin.com>:
> On Mon, 20 Aug 2018 11:43:34 +0100
> Srinivas Kandagatla <srinivas.kandagatla@...aro.org> wrote:
>
>>
>> Overall am still not able to clear visualize on how MTD bindings with
>> nvmem cells would look in both partition and un-partition usecases?
>> An example DT would be nice here!!
>
> Something along those lines:
>
>         mtdnode {
>                 nvmem-cells {
>                         #address-cells = <1>;
>                         #size-cells = <1>;
>
>                         cell@0 {
>                                 reg = <0x0 0x14>;
>                         };
>                 };
>
>                 partitions {
>                         compatible = "fixed-partitions";
>                         #address-cells = <1>;
>                         #size-cells = <1>;
>
>                         partition@0 {
>                                 reg = <0x0 0x20000>;
>
>                                 nvmem-cells {
>                                         #address-cells = <1>;
>                                         #size-cells = <1>;
>
>                                         cell@0 {
>                                                 reg = <0x0 0x10>;
>                                         };
>                                 };
>                         };
>                 };
>         };

If there'll be an agreement on the bindings: will you be willing to
merge Alban's patch even without support in the code for the above
(with the assumption that it will be added later)? My use-case is on
non-DT systems and creating nvmem devices corresponding to MTD
partitions if fine by me. I also don't have the means to test the
support for these bindings if I were to actually write them myself.

Best regards,
Bartosz Golaszewski