From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-14.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AAD7EC433E0 for ; Tue, 9 Feb 2021 23:52:55 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C52B464DB3 for ; Tue, 9 Feb 2021 23:52:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C52B464DB3 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=sntech.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-ID:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=ZJcm5GoLpFUpVro/+QUYwzhPMe+ipeAm3aSZhEsCmDg=; b=guMD1xTWFGGzUYSht3Dr0KADk ILK1lrsH1pTvWGXscqVfkxuhYxB9i24CRAs8t2gmSvmZ4BsogioHyJzJ0Zp7dAQAa/KRuBBLvgZGG O23DEbJsZugWLScu+6pYMB/ag5S1/I8+urtDAMsVt9r01ZVd1+HotxplKPBT8cgaBH2orwdt7iMM8 OkAhezSJDjDx2fChnMiB6liKuqpBp8dm5dmkzcF3SLAxv/gErqVHNLVrLmQk1sJymkd4Ze3fVgpsl 1G6jRnv7mZ8TufSxkKmpxbCoEaBnOMaIDSMoEYDeLV3YorVedCS8W+MzHzrQW4oOYQQH7cvNw44HC ze4GPr+Rw==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1l9cme-0006NI-CY; Tue, 09 Feb 2021 23:51:04 +0000 Received: from gloria.sntech.de ([185.11.138.130]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1l9cma-0006MF-8T; Tue, 09 Feb 2021 23:51:01 +0000 Received: from ip5f5aa64a.dynamic.kabel-deutschland.de ([95.90.166.74] helo=diego.localnet) by gloria.sntech.de with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1l9cmX-0001IP-F6; Wed, 10 Feb 2021 00:50:57 +0100 From: Heiko =?ISO-8859-1?Q?St=FCbner?= To: Johan Jonker , Arnd Bergmann Subject: Re: [PATCH 2/5] ARM: dts: rockchip: assign a fixed index to mmc devices on rv1108 boards Date: Wed, 10 Feb 2021 00:50:56 +0100 Message-ID: <6598201.ejJDZkT8p0@diego> In-Reply-To: References: <20210118155242.7172-1-jbx6244@gmail.com> <20210118155242.7172-2-jbx6244@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210209_185100_356421_E90814F1 X-CRM114-Status: GOOD ( 27.88 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: DTML , "linux-kernel@vger.kernel.org" , "open list:ARM/Rockchip SoC support" , Rob Herring , robin.murphy@arm.com, Linux ARM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Am Dienstag, 9. Februar 2021, 23:25:40 CET schrieb Arnd Bergmann: > On Mon, Jan 18, 2021 at 4:52 PM Johan Jonker wrote: > > > > Recently introduced async probe on mmc devices can shuffle block IDs. > > Pin them to fixed values to ease booting in environments where UUIDs are > > not practical. Use newly introduced aliases for mmcblk devices from [1]. > > The sort order is based on reg address. > > > > [1] https://patchwork.kernel.org/patch/11747669/ > > I just saw this in the pull request: > > > Signed-off-by: Johan Jonker > > --- > > arch/arm/boot/dts/rv1108.dtsi | 3 +++ > > 1 file changed, 3 insertions(+) > > > > diff --git a/arch/arm/boot/dts/rv1108.dtsi b/arch/arm/boot/dts/rv1108.dtsi > > index bec47e0be..a754851f4 100644 > > --- a/arch/arm/boot/dts/rv1108.dtsi > > +++ b/arch/arm/boot/dts/rv1108.dtsi > > @@ -19,6 +19,9 @@ > > i2c1 = &i2c1; > > i2c2 = &i2c2; > > i2c3 = &i2c3; > > + mmc0 = &emmc; > > + mmc1 = &sdio; > > + mmc2 = &sdmmc; > > serial0 = &uart0; > > serial1 = &uart1; > > serial2 = &uart2; > > Please don't put these aliases into a .dtsi file, as not every board > will provide each instance. The entire point of the aliases is to > have sane enumeration, so you should start at index 0 for the > first one that is actually present and count up from there. Hmm, right now I don't see the disadvantage of missing mmc numbers. As similarly we count i2c and serial numbers for a long time, even though not all of them appear on every board. Especially as the main goal is to simply have stable numbers and not having the mmc devices swap numbers on every boot. So right now we're not using them from a userspace POV but instead agreed on following the address ordering of the soc. so when ordering mmc controllers by their io-address, mmc0 is the first one, then mmc1, etc. So just for my understanding, what is different for mmc? I guess to guarantee ongoing numbering similar to sd{a,b,c,...} Or should all aliases be duplicted in each board dts and not live in any soc dtsi? Heiko > I would suggest you move these aliases into the .dts files for > the existing boards for the next cycle, and then make sure > only the ones that are present have an alias. > > It might actually be a good idea to have a warning in dtc when > there is an alias pointing to a status="disabled" device, but I > suspect there would be a lot of fallout from that. > > Arnd > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel