linux-kernel - Re: [PATCH 0/5] defconfigs: add MTD_SPI

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Message-ID: <20140418063054.GK5512@norris-Latitude-E6410>
Date:	Thu, 17 Apr 2014 23:30:54 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Thierry Reding <thierry.reding@...il.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Marek Vasut <marex@...x.de>, linux-mtd@...ts.infradead.org,
	Russell King <linux@....linux.org.uk>,
	Shawn Guo <shawn.guo@...escale.com>,
	Sascha Hauer <kernel@...gutronix.de>,
	Stephen Warren <swarren@...dotorg.org>,
	Olof Johansson <olof@...om.net>,
	linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org,
	Steven Miao <realmz6@...il.com>,
	adi-buildroot-devel@...ts.sourceforge.net,
	Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	linuxppc-dev@...ts.ozlabs.org, linux-sh@...r.kernel.org
Subject: Re: [PATCH 0/5] defconfigs: add MTD_SPI_NOR (dependency for M25P80)

Hi,

On Thu, Apr 17, 2014 at 12:53:03PM +0200, Thierry Reding wrote:
> On Thu, Apr 17, 2014 at 12:21:44AM -0700, Brian Norris wrote:
> > We are introducing a new SPI-NOR library/framework for MTD, to support various
> > types of SPI-NOR flash controllers which require (or benefit from) intimate
> > knowledge of the flash interface, rather than just the relatively dumb SPI
> > interface. This library borrows much of the m25p80 driver for its abstraction
> > and moves this code into a spi-nor module.
> 
> If this is a common library, then the more common approach to solve this
> would be to have each driver that uses it to select MTD_SPI_NOR rather
> than depend on it. That way you can drop this whole series to update the
> default configurations.

But does MTD_SPI_NOR (and drivers/mtd/spi-nor/) qualify as a "library"
or as a "subsystem"? I thought the latter were typically expected to be
user-selectable options, not automatically-"select"ed.

I would say that, except for its age, MTD_SPI_NOR is very similar in to
MTD_NAND (driver/mtd/nand/), which I'd consider a kind of subsystem, and
which users must select before they are asked about drivers which fall
under its category.

Perhaps my usage of the word "library" in the description was a mistake,
as I don't exactly consider it like a library in the sense of many other
"select"ed libraries.

Brian
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