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

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Date:	Mon, 23 May 2011 17:13:48 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Samuel Ortiz <sameo@...ux.intel.com>
Cc:	Subhasish Ghosh <subhasish@...tralsolutions.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	"Nori, Sekhar" <nsekhar@...com>,
	linux-arm-kernel@...ts.infradead.org,
	davinci-linux-open-source@...ux.davincidsp.com,
	sachi@...tralsolutions.com,
	open list <linux-kernel@...r.kernel.org>,
	"Watkins, Melissa" <m-watkins@...com>
Subject: Re: [PATCH v4 01/11] mfd: add pruss mfd driver.

Hi Samuel,

On Sunday 22 May 2011, Samuel Ortiz wrote:
> On Wed, May 11, 2011 at 10:03:54PM +0200, Arnd Bergmann wrote:
> > On Wednesday 11 May 2011, Subhasish Ghosh wrote:
> > We had a little discussion at the Linaro Developer Summit about your
> > driver and mfd drivers in general. There was a general feeling among
> > some people (including me) that by the point you dynamically create
> > the subdevices, MFD is probably not the right abstraction any more,
> > as it does not provide any service that you need.
> I agree it's not what it's been designed for.
> 
> 
> > Instead, maybe you can simply call platform_device_register
> > at that stage to create the children and not use MFD at all.
> The MFD APIs are slightly easier to use though, imho.
> 
> 
> > Samuel, can you comment on this as well? Do you still see pruss
> > as an MFD driver when the uses are completely dynamic and determined
> > by the firmware loaded into it?
> Even though that is definitely not a typical MFD use case, I wouldn't object
> strongly against it. Right now mfd is probably the least worst choice for this
> kind of drivers, which still doesn't make it an ideal situation.

Thanks for your input! When you say that MFD APIs are easier to use than
platform_device APIs, is that something we should fix with platform devices
to make them easier to use?

	Arnd
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