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From: Pierre Ossman <>
Cc: Carlos Aguiar <>,
	Tony Lindgren <>,
Subject: Re: [PATCH 05/18] MMC: OMAP: Introduce new multislot structure and change driver to use it
Date: Thu, 6 Mar 2008 07:34:32 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Wed, 5 Mar 2008 22:54:09 +0200
Felipe Balbi <> wrote:

> Not nightmare. OMAP1/2 have mmc/sd/sdio controller supporting one or
> more mmc cards sharing the same bus.

Do you have some docs to that effect? All that's been presented to me so far is a standard, one port controller with a mux in front of it. Under that definition, all controllers support an infinite number of cards.

> > > +
> > > +		    MMC_CAP_SD_HIGHSPEED;
> > 
> > This is also unrelated. From what I've seen, the OMAP is a SD controller and does not support high speed MMC. The fact that you also conditionally set the max frequency later also suggests that this code is entirely incorrect.
> > 
> Not true. I can't show you not even parts of the technical documentation
> but OMAP has mmc/sd/sdio controller. On OMAP1/2 it handles several mmc
> cards sharing the same bus.

I'm afraid empirical data is insufficient. Show me a data sheet saying that OMAP controllers are designed in accordance with the newer MMC specs and I'll be happy.

And you'll have to do a lot better than that to convince me that older OMAP controllers are designed for standards that were written after the chips were released (i.e. high speed bus timings).

     -- Pierre Ossman

  Linux kernel, MMC maintainer
  PulseAudio, core developer
  rdesktop, core developer

  reply	other threads:[~2008-03-06  6:36 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-28 19:07 Carlos Aguiar
2008-01-29  1:17 ` Roel Kluin
2008-02-07 17:37 ` Pierre Ossman
2008-03-05 20:54   ` Felipe Balbi
2008-03-06  6:34     ` Pierre Ossman [this message]
2008-03-14 19:35 [PATCH 00/18] MMC: OMAP: Sync MMC OMAP driver with mainline tree Carlos Aguiar
2008-03-24 12:26 ` Pierre Ossman
2008-03-26 20:08   ` [PATCH 05/18] MMC: OMAP: Introduce new multislot structure and change driver to use it Carlos Aguiar
2008-03-14 19:36 Carlos Aguiar
2008-03-24 12:13 ` Pierre Ossman

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