From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757154AbcH2LWG (ORCPT ); Mon, 29 Aug 2016 07:22:06 -0400 Received: from mail-wm0-f50.google.com ([74.125.82.50]:33618 "EHLO mail-wm0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756125AbcH2LWD (ORCPT ); Mon, 29 Aug 2016 07:22:03 -0400 MIME-Version: 1.0 In-Reply-To: <20160826222945.GA6679@zach-desktop> References: <1472080984-17373-1-git-send-email-zach.brown@ni.com> <20160825105640.GA5439@remoulade> <20160825171539.GA13571@zach-desktop> <20160825180959.GA14705@remoulade> <20160825182621.GA14817@zach-desktop> <20160825182852.GB15000@remoulade> <20160825204645.GA19450@zach-desktop> <20160826222945.GA6679@zach-desktop> From: Ulf Hansson Date: Mon, 29 Aug 2016 13:21:41 +0200 Message-ID: Subject: Re: [PATCH 1/2] sdhci-of-arasan: Add quirk and device tree parameter to fake CD bit To: Zach Brown Cc: Mark Rutland , Adrian Hunter , Rob Herring , linux-mmc , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Michal Simek , =?UTF-8?Q?S=C3=B6ren_Brinkmann?= , "linux-arm-kernel@lists.infradead.org" , Lars-Peter Clausen Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 27 August 2016 at 00:29, Zach Brown wrote: > On Fri, Aug 26, 2016 at 09:42:38AM +0200, Ulf Hansson wrote: >> On 25 August 2016 at 22:46, Zach Brown wrote: >> > On Thu, Aug 25, 2016 at 07:28:55PM +0100, Mark Rutland wrote: >> >> On Thu, Aug 25, 2016 at 01:26:22PM -0500, Zach Brown wrote: >> >> > On Thu, Aug 25, 2016 at 07:10:00PM +0100, Mark Rutland wrote: >> >> > > On Thu, Aug 25, 2016 at 12:15:44PM -0500, Zach Brown wrote: >> >> > > > In cases where the card is non-removable then polling doesn't make sense. >> >> > > >> >> > > We have the non-removable property to describe that, so we can also look at that. >> >> > > >> >> > > > So it doesn't make sense to tie the test mode workaround into the broken-cd >> >> > > > property, even though I agree the nature of the defect fits under the notion >> >> > > > of the CD being broken. >> >> > > >> >> > > Maybe not solely on broken-cd, but I think that we dont necessarily need a new >> >> > > DT property. As above, broken-cd, non-removable, and the compatible string may >> >> > > together give the kernel enough information to choose the right thing to do. >> >> > > >> >> > > Thanks, >> >> > > Mark. >> >> > >> >> > I'm not sure if I understand your suggestion completely. Are you suggesting >> >> > setting both the broken-cd and non-removable properties? That would make sense, >> >> > but my understanding was that the two properities are not meant to co-exist. In >> >> > /Documentation/devicetree/bindings/mmc/mmc.txt it states that only one should >> >> > be supplied. Don't the two properties conflict with each other? >> >> >> >> They do for the cases that exist today, but given we're updating the document >> >> anyway, we could simply clarify the cases in which the two can sanely co-exist >> >> (e.g. for this particular IP block). >> >> No, please! >> >> Depending on the SDHCI variant there is already some difference on how >> broken-cd is treated. >> >> Let's not add yet another, as I think it will be too complicated for >> people to understand the bindings. >> > > Shawn Lin pointed out that there might be instances of the arasan controller > that don't have the behavior the patch addresses. Having a new DT binding > specific for this case would avoid needing to maintain a list of controllers > that need the fix. > Okay! >> >> >> >> Thanks, >> >> Mark. >> > >> > That makes sense. I'll change the documentation for broken-cd and non-removable >> > in the IP specific document and change the driver accordingly. >> >> I rather have a new DT binding specific for this case. >> >> Perhaps there's a better name than "fake-cd". How about "force-cd", or >> if someone can come up with a better name. >> >> Kind regards >> Uffe > > I've been trying to come up with a better name. Here are a few ideas > cd-not-wired > needs-test-cd > fails-without-force-cd Yeah, we could probably announce a naming competition for this. :-) Just select one of them and try to get an ack from Rob/Mark then I will pick up the change. Kind regards Uffe