From: Seungwon Jeon <tgih.jun@samsung.com>
To: "'Chris Ball'" <cjb@laptop.org>, "'Olof Johansson'" <olof@lixom.net>
Cc: "'Doug Anderson'" <dianders@google.com>,
        "'James Hogan'" <james.hogan@imgtec.com>, linux-mmc@vger.kernel.org,
        "'Tomasz Figa'" <tomasz.figa@gmail.com>,
        "'Jaehoon Chung'" <jh80.chung@samsung.com>,
        "'Grant Grundler'" <grundler@chromium.org>,
        "'Alim Akhtar'" <alim.akhtar@samsung.com>,
        "'Abhilash Kesavan'" <a.kesavan@samsung.com>,
        "'Doug Anderson'" <dianders@chromium.org>,
        "'linux-samsung-soc'" <linux-samsung-soc@vger.kernel.org>,
        "'Kukjin Kim'" <kgene.kim@samsung.com>, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        "'Sonny Rao'" <sonnyrao@chromium.org>
References: <CAD=FV=U3aT1KKtSwAFhYURJJerp70ij8h647=xyV51et4jYipg@mail.gmail.com>
 <CAOesGMjaF2K0CnuWBj7xdXGAQk-XRetBstaQdd9EZzBYrmDjeA@mail.gmail.com>
 <86mworfzsf.fsf@void.printf.net>
In-reply-to: <86mworfzsf.fsf@void.printf.net>
Subject: RE: dw_mmc: Does anyone use multiple slots?
Date: Fri, 09 Aug 2013 12:18:07 +0900
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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@google.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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