linux-kernel - RE: dw_mmc: Does anyone use multiple slots?

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Date:	Fri, 09 Aug 2013 12:18:07 +0900
From:	Seungwon Jeon <tgih.jun@...sung.com>
To:	'Chris Ball' <cjb@...top.org>, 'Olof Johansson' <olof@...om.net>
Cc:	'Doug Anderson' <dianders@...gle.com>,
	'James Hogan' <james.hogan@...tec.com>,
	linux-mmc@...r.kernel.org, 'Tomasz Figa' <tomasz.figa@...il.com>,
	'Jaehoon Chung' <jh80.chung@...sung.com>,
	'Grant Grundler' <grundler@...omium.org>,
	'Alim Akhtar' <alim.akhtar@...sung.com>,
	'Abhilash Kesavan' <a.kesavan@...sung.com>,
	'Doug Anderson' <dianders@...omium.org>,
	'linux-samsung-soc' <linux-samsung-soc@...r.kernel.org>,
	'Kukjin Kim' <kgene.kim@...sung.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	'Sonny Rao' <sonnyrao@...omium.org>
Subject: RE: dw_mmc: Does anyone use multiple slots?

On Fri, August 09, 2013, Chris Ball wrote:
> On Fri, Aug 09 2013, Olof Johansson wrote:
> > On Thu, Aug 8, 2013 at 5:16 PM, Doug Anderson <dianders@...gle.com> wrote:
> >
> >> I guess my overall question is: if there are no actual implementations
> >> of multislot, shouldn't we kill it and simplify the code a whole lot?
> >> If someone out there has a real multislot device they can step back in
> >> and do it more correctly?
> >>
> >> Of course we need to find someone to actually go through and do the
> >> killing of multislot, but finding that person might be easier if there
> >> was some agreement that it was good to do.
> >
> > There clearly seems to be no in-tree users of multislot. If someone
> > new comes in, we have the code in the history and can revert the
> > removal (or at least use it as reference for re-introduction).
> >
> > I vote for removing it. It adds really annoying complexity for
> > something that nobody uses.
> 
> I agree with Olof, for what it's worth.  (The maintainers of the
> driver are Jaehoon and Seungwon, though.)

I feel like there is no actual use case for that though origin Synopsys IP supports.
Multi-slot  might be not useful in terms of performance because shared bus should be allowed.
(At least this is the way I see it, though)
As Exynos's host does so, other hosts which are introduced in Linux seems use one card per host.
If it's really not found now, I could agree on this topic.

Thanks,
Seungwon Jeon

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