linux-kernel - Re: [PATCH 07/19] timberdale: mfd_cell is now implicitly available to drivers

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Message-ID: <1302113228.2840.29.camel@bwh-desktop>
Date:	Wed, 06 Apr 2011 19:07:08 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Samuel Ortiz <sameo@...ux.intel.com>
Cc:	Greg KH <gregkh@...e.de>, Grant Likely <grant.likely@...retlab.ca>,
	Andres Salomon <dilinger@...ued.net>,
	linux-kernel@...r.kernel.org,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	khali@...ux-fr.org, ben-linux@...ff.org,
	Peter Korsgaard <jacmet@...site.dk>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	linux-i2c@...r.kernel.org, linux-media@...r.kernel.org,
	netdev@...r.kernel.org, spi-devel-general@...ts.sourceforge.net,
	Mocean Laboratories <info@...ean-labs.com>
Subject: Re: [PATCH 07/19] timberdale: mfd_cell is now implicitly available
 to drivers

On Wed, 2011-04-06 at 19:51 +0200, Samuel Ortiz wrote:
> Hi Ben,
> 
> On Wed, Apr 06, 2011 at 06:16:49PM +0100, Ben Hutchings wrote:
> > > So, adding an MFD cell pointer to the device structure allows us to cleanly
> > > pass both pieces of information, while keeping all the MFD sub drivers
> > > independant from the MFD core if they want/can.
> > 
> > Why isn't an MFD the parent of its component devices?
> It actually is. How would that help here ?

I was thinking you could encode the component address in the
platform_device name (just as the bus address is the name of a normal
bus device).  That plus the parent device pointer would be sufficient
information to look up the mfd_cell.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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