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

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Date:	Wed, 9 Jul 2008 12:38:19 +0100
From:	Ben Dooks <ben-linux@...ff.org>
To:	Dmitry <dbaryshkov@...il.com>
Cc:	Ben Dooks <ben-linux@...ff.org>, 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.

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.

[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
> 
> -------------------------------------------------------------------
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-- 
-- 
Ben

Q:      What's a light-year?
A:      One-third less calories than a regular year.

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