linux-kernel - Re: [patch 3/4] MFD: Remove unnecessary fields if mfd_cell structure.

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Date:	Wed, 9 Jul 2008 15:44:30 +0400
From:	Dmitry <dbaryshkov@...il.com>
To:	"Ben Dooks" <ben-linux@...ff.org>
Cc:	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.arm.linux.org.uk
Subject: Re: [patch 3/4] MFD: Remove unnecessary fields if mfd_cell structure.

2008/7/9 Ben Dooks <ben-linux@...ff.org>:
> On Wed, Jul 09, 2008 at 03:16:47PM +0400, Dmitry wrote:
>> 2008/7/9 Ben Dooks <ben-linux@...ff.org>:
>> > On Wed, Jul 09, 2008 at 03:09:12PM +0400, Dmitry wrote:
>> >> 2008/7/9 Ben Dooks <ben-linux@...ff.org>:
>> >> > The enable,disable,suspend and resume entry in the struct mfd_cell
>> >> > do not seem to be necessary as they should be handled by the
>> >> > platform driver that the device created has bound to.
>> >>
>> >> NAK. It's used e.g. by the tmio-nand driver. These fields provide easy
>> >> way to support
>> >> enhanced power management, etc.
>> >
>> > What enhancements over the standard platform device model do you need?
>>
>> As an example of what  we need, please check the tmio-nand driver.
>
> As posted below, the driver on the linux-mtd list does not use this,
> and further more in [1] the method of getting to the the mfd_cell from
> a given platform_device has gone which would be used by [2] if it
> actually touched the mfd_cell information.

It is used. Go, search for mfd_get_cell.
And yes, it will require a minor change as discussed in the mfd thread
yesterday.

>
> [1] http://lists.arm.linux.org.uk/lurker/message/20080708.153450.bb33046d.en.html
> [2] http://lists.infradead.org/pipermail/linux-mtd/2008-June/022137.html
>
>> >
>> >> >
>> >> > Signed-off-by: Ben Dooks <ben-linux@...ff.org>
>> >> >
>> >> > Index: linux-2.6.26-rc9-next20080709/include/linux/mfd/core.h
>> >> > ===================================================================
>> >> > --- linux-2.6.26-rc9-next20080709.orig/include/linux/mfd/core.h 2008-07-09 10:44:45.000000000 +0100
>> >> > +++ linux-2.6.26-rc9-next20080709/include/linux/mfd/core.h      2008-07-09 10:45:06.000000000 +0100
>> >> > @@ -23,12 +26,6 @@
>> >> >  */
>> >> >  struct mfd_cell {
>> >> >        const char              *name;
>> >> > -
>> >> > -       int                     (*enable)(struct platform_device *dev);
>> >> > -       int                     (*disable)(struct platform_device *dev);
>> >> > -       int                     (*suspend)(struct platform_device *dev);
>> >> > -       int                     (*resume)(struct platform_device *dev);
>> >> > -
>> >> >        void                    *driver_data; /* driver-specific data */
>> >> >
>> >> >        /*
>> >> >
>> >> > --
>> >> >
>> >>
>> >>
>> >>
>> >> --
>> >> With best wishes
>> >> Dmitry
>> >
>> > --
>> > --
>> > Ben
>> >
>> > Q:      What's a light-year?
>> > A:      One-third less calories than a regular year.
>> >
>> >
>>
>>
>>
>> --
>> With best wishes
>> Dmitry
>>
>> -------------------------------------------------------------------
>> List admin: http://lists.arm.linux.org.uk/mailman/listinfo/linux-arm-kernel
>> FAQ:        http://www.arm.linux.org.uk/mailinglists/faq.php
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>
> --
> --
> Ben
>
> Q:      What's a light-year?
> A:      One-third less calories than a regular year.
>
>

-- 
With best wishes
Dmitry
--
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