linux-kernel - Re: [PATCH 28/29] mfd-core: add platform

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Date:	Mon, 28 Feb 2011 17:40:14 +0100
From:	Samuel Ortiz <sameo@...ux.intel.com>
To:	Andres Salomon <dilinger@...ued.net>
Cc:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 28/29] mfd-core: add platform_device sharing support
 for mfd (v2)

Hi Andres,

On Thu, Feb 17, 2011 at 07:07:35PM -0800, Andres Salomon wrote:
> This adds functions to enable platform_device sharing for mfd clients.
> 
> Each platform driver (mfd client) that wants to share an mfd_cell's
> platform_device uses the mfd_shared_platform_driver_{un,}register()
> functions instead of platform_driver_{un,}register().  Along with
> registering the platform driver, these also register a new platform
> device with the same characteristics as the original cell, but a different
> name.  Given an mfd_cell with the name "foo", drivers that want to
> share access to its resources can call mfd_shared_platform_driver_register
> with platform drivers named (for example) "bar" and "baz".  This
> will register two platform devices and drivers named "bar" and "baz"
> that share the same cell as the platform device "foo".  The drivers
> can then call "foo" cell's enable hooks (or mfd_shared_cell_enable)
> to enable resources, and obtain platform resources as they normally
> would.
I'm not fine with the naming, as it really is doing more than
registering a platform driver. But since I can not come up with a better name
right now, I would really appreciate if you could add some comments there
explaining what this routine (mfd_shared_platform_driver_register)
does and in which cases it is needed. The OLPC example could also be
mentioned.

Cheers,
Samuel.

-- 
Intel Open Source Technology Centre
http://oss.intel.com/
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