linux-kernel - Re: [PATCH v4 01/11] mfd: add pruss mfd driver.

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Message-ID: <20110514221445.GB21792@opensource.wolfsonmicro.com>
Date:	Sat, 14 May 2011 15:14:46 -0700
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Subhasish Ghosh <subhasish@...tralsolutions.com>,
	"Nori, Sekhar" <nsekhar@...com>,
	linux-arm-kernel@...ts.infradead.org,
	davinci-linux-open-source@...ux.davincidsp.com,
	sachi@...tralsolutions.com, Samuel Ortiz <sameo@...ux.intel.com>,
	open list <linux-kernel@...r.kernel.org>,
	"Watkins, Melissa" <m-watkins@...com>
Subject: Re: [PATCH v4 01/11] mfd: add pruss mfd driver.

On Sat, May 14, 2011 at 10:33:53PM +0200, Arnd Bergmann wrote:

> I guess drivers/mfd would be a better place than drivers/misc, but it might not
> need to be an mfd driver in the sense that it registers mfd cells.

Yes, it might be more sensible to just open code.  OTOH mfd_cell is
marginally easier to use.

> The more important point is to remove the device registration from the board
> file. You definitely should not have the cells in the board file, but replacing
> them with platform devices in the board file makes it no better.

Agreed entirely, it should be something higher level than that.

> My whole point has been that you register them from the main pruss driver
> based on run-time data instead of compile-time pre-configured stuff in the
> board file.

I'm not so sure - if the usage is fixed as a result of the pins on the
device being wired a CAN bus then it seems reasonable to tell the system
about that so it'll stop the user trying to run SPI or something against
it at runtime.
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