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

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Message-Id: <201404211652.39704.marex@denx.de>
Date:	Mon, 21 Apr 2014 16:52:39 +0200
From:	Marek Vasut <marex@...x.de>
To:	Brian Norris <computersforpeace@...il.com>
Cc:	Thierry Reding <thierry.reding@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	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)

On Friday, April 18, 2014 at 08:30:54 AM, Brian Norris wrote:
> 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 agree the "subsystem" is user-selectable while the "library" is to be 
'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.

It did look like a library to me at first, but it's rather a subsystem that 
contains a small library in it. Thus, I retract my previous comment about using 
'select' and add :

Acked-by: Marek Vasut <marex@...x.de>

Best regards,
Marek Vasut
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