From mboxrd@z Thu Jan 1 00:00:00 1970 From: Seungwon Jeon Subject: RE: dw_mmc: Does anyone use multiple slots? Date: Fri, 09 Aug 2013 12:18:07 +0900 Message-ID: <000e01ce94af$12710ef0$37532cd0$%jun@samsung.com> References: <86mworfzsf.fsf@void.printf.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ks_c_5601-1987 Content-Transfer-Encoding: 7bit Return-path: Received: from mailout1.samsung.com ([203.254.224.24]:46415 "EHLO mailout1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S967411Ab3HIDSL (ORCPT ); Thu, 8 Aug 2013 23:18:11 -0400 In-reply-to: <86mworfzsf.fsf@void.printf.net> Content-language: ko Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: 'Chris Ball' , 'Olof Johansson' Cc: 'Doug Anderson' , 'James Hogan' , linux-mmc@vger.kernel.org, 'Tomasz Figa' , 'Jaehoon Chung' , 'Grant Grundler' , 'Alim Akhtar' , 'Abhilash Kesavan' , 'Doug Anderson' , 'linux-samsung-soc' , 'Kukjin Kim' , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, 'Sonny Rao' 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 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