netdev - Re: [PATCH 5/5] net: add MTD support to eth_platform_get_mac

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Date:   Thu, 19 Jul 2018 10:14:29 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Sekhar Nori <nsekhar@...com>, Kevin Hilman <khilman@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Grygorii Strashko <grygorii.strashko@...com>,
        "David S . Miller" <davem@...emloft.net>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Lukas Wunner <lukas@...ner.de>, Rob Herring <robh@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>,
        David Lechner <david@...hnology.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-omap@...r.kernel.org, netdev@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH 5/5] net: add MTD support to eth_platform_get_mac_address()

2018-07-18 19:03 GMT+02:00 Andrew Lunn <andrew@...n.ch>:
>> >> +#ifdef CONFIG_MTD
>> >> +     /* NOTE: this should go away as soon as MTD gets nvmem support. */
>> >> +     if (!addr) {
>> >> +             struct mtd_info *mtd;
>> >> +             int rv;
>> >> +
>> >> +             mtd = get_mtd_device_nm("MAC-Address");
>> >
>> > In order for this to go away, you need to keep backwards
>> > compatibility. When using nvmem, you look for a cell called
>> > "mac-address". Here you are looking for "MAC-Address". That is going
>> > to make backwards compatibility harder. How do you plan to do it?
>> >
>> >    Andrew
>>
>> I'm trying to adjust to already existing users. The only user of
>> get_mtd_device_nm() who calls it to read the MAC address registers a
>> partition called "MAC-Address". We can't change it since it's visible
>> from user space. In the future we'd just have to have a list of
>> supported string that we'd use to do the nvmem lookup.
>
> Why not have the nvmem cell called "MAC-Address"? When you add nvmem
> support to MTD, i assume you are going to map each MTD partition to an
> nvmem cell?

Because all existing users of nvmem use "mac-address" as the name of
this cell already. I guess we will need to live with both in this
particular function.

Bart