linux-kernel - Re: [PATCH] [RFC v3] OF: OpenFirmware bindings for the mmc

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Date:	Thu, 5 Jun 2008 22:00:58 +0400
From:	Anton Vorontsov <avorontsov@...mvista.com>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	Pierre Ossman <drzeus-mmc@...eus.cx>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Jochen Friedrich <jochen@...am.de>,
	Segher Boessenkool <segher@...nel.crashing.org>,
	Gary Jennejohn <garyj@...x.de>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [RFC v3] OF: OpenFirmware bindings for the mmc_spi
	driver

On Thu, Jun 05, 2008 at 11:36:09AM -0600, Grant Likely wrote:
> On Thu, Jun 5, 2008 at 11:27 AM, Anton Vorontsov
> <avorontsov@...mvista.com> wrote:
> > On Thu, Jun 05, 2008 at 10:45:17AM -0600, Grant Likely wrote:
> >> On Thu, Jun 5, 2008 at 10:16 AM, Anton Vorontsov
> >> <avorontsov@...mvista.com> wrote:
> >> > Here is v3. I'm out of ideas if you won't like it. :-)
> >> >
> >> > v3:
> >> > - Now these bindings are using bus notifiers chain, thus we adhere to the
> >> >  spi bus.
> >> >
> >> >  By the way, this scheme (IMO) looks good for I2C devices which needs
> >> >  platform_data extracted from the device tree too (Cc'ing Jochen).
> >> >
> >> > - Plus changed the OF bindings themselves, implemented voltage-range
> >> >  property. (Pierre, please take a look at vddrange_to_ocrmask(). I
> >> >  wonder if you would like this in the MMC core instead, with a kernel
> >> >  doc, of course.)
> >> >
> >> > v2:
> >> > - Bindings were adhered to the MMC_SPI driver. Withdrawn by Pierre Ossman.
> >>
> >> Personally I think your v2 was better, and if I'm interpreting
> >> Pierre's comments correctly I think his main point is that instead of
> >> using the 'stock' probe/remove hooks for the spi mmc driver, the
> >> driver should be mildly reworked to provide a common block of code
> >> that can be used by both the OF and non-OF versions of the
> >> probe/remove routines.  I also think that is the way to go.
> >
> > Well, I mentioned the usb_add_hcd()-alike approach for the mmc_spi
> > host... The absence of enthusiasm I equaled to "no".
> >
> > Heh.
> 
> I'm allergic to USB HCD code; I was probably having convulsions under my desk.

:-)

Ok, I also mentioned drivers/ata/pata_of_platform.c (OF version is using
common code from drivers/ata/pata_platform.c).

Please look there, and tell me if this is what you have in mind. (ignore
_probe in the __pata_platform_probe name. Imagine
pata_platform_add_controller or something).

> > p.s.
> > Btw, you forgot another downside of v2 approach: struct spi_driver
> > duplication... Not sure if everyone will be happy about it.
> >
> > Though, v2 is only version where we can make modular OF_MMC_SPI.
> 
> I think we've got our wires crossed.  I'm not referring to the option
> of an of_mmc_spi driver registering an mmc_spi device (which can then
> be probed by the mmc_spi_driver).

I'm not refrering to this option either.

> I'm referring to refactoring the
> probe/remove code so that common stuff is callable by both the mmc_spi
> and of_mmc_spi drivers without the oddity of the of_mmc_spi probe hook
> calling the mmc_spi probe hook.

I understand this.

-- 
Anton Vorontsov
email: cbouatmailru@...il.com
irc://irc.freenode.net/bd2
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