linux-kernel - Re: [RFC PATCH 0/7] mtd: partitions: add of_match

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Date:	Sat, 5 Dec 2015 19:06:57 +0100
From:	Michal Suchanek <hramrach@...il.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Brian Norris <computersforpeace@...il.com>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Arnd Bergmann <arnd@...db.de>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	devicetree-spec@...r.kernel.org, Simon Arlott <simon@...e.lp0.eu>,
	Linus Walleij <linus.walleij@...aro.org>,
	Rafał Miłecki <zajec5@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	David Hendricks <dhendrix@...omium.org>,
	Jonas Gorski <jogo@...nwrt.org>,
	Rob Herring <robh+dt@...nel.org>,
	MTD Maling List <linux-mtd@...ts.infradead.org>,
	Hauke Mehrtens <hauke@...ke-m.de>
Subject: Re: [RFC PATCH 0/7] mtd: partitions: add of_match_table support

On 5 December 2015 at 11:15, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> On Sat, Dec 5, 2015 at 6:19 AM, Brian Norris
> <computersforpeace@...il.com> wrote:
>> There have been several discussions [1] about adding a device tree binding for
>> associating flash devices with the partition parser(s) that are used on the
>> flash. There are a few reasons:
>>
>>  (1) drivers shouldn't have to be encoding platform knowledge by listing what
>>      parsers might be used on a given system (this is the currently all that's
>>      supported)
>>  (2) we can't just scan for all supported parsers (like the block system does), since
>>      there is a wide diversity of "formats" (no standardization), and it is not
>>      always safe or efficient to attempt to do so, particularly since many of
>>      them allow their data structures to be placed anywhere on the flash, and
>>      so require scanning the entire flash device to find them.
>
> I read the second reason, but would it be useful to (partially) merge
> block/partitions/ and drivers/mtd/partitions/, so I can use e.g. msdos
> partitions
> on an mtd device??
>

Using msdos partition on a MTD device does not sound terribly useful.
On what kind of non-block device would you expect to find one?

On the other hand, using FMAP on a block device might work an even
might have some uses.

Thanks

Michal
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