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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 334AAC433EF for ; Tue, 5 Oct 2021 16:31:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1C99A611C1 for ; Tue, 5 Oct 2021 16:31:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236485AbhJEQdc (ORCPT ); Tue, 5 Oct 2021 12:33:32 -0400 Received: from mslow1.mail.gandi.net ([217.70.178.240]:40973 "EHLO mslow1.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236512AbhJEQd3 (ORCPT ); Tue, 5 Oct 2021 12:33:29 -0400 Received: from relay9-d.mail.gandi.net (unknown [217.70.183.199]) by mslow1.mail.gandi.net (Postfix) with ESMTP id 39547D5799; Tue, 5 Oct 2021 16:28:41 +0000 (UTC) Received: (Authenticated sender: alexandre.belloni@bootlin.com) by relay9-d.mail.gandi.net (Postfix) with ESMTPSA id CD54AFF806; Tue, 5 Oct 2021 16:28:16 +0000 (UTC) Date: Tue, 5 Oct 2021 18:28:16 +0200 From: Alexandre Belloni To: Arnd Bergmann List-Id: Cc: =?utf-8?B?UGF3ZcWC?= Anikiel , jarkko.nikula@linux.intel.com, Andy Shevchenko , Mika Westerberg , Rob Herring , Philipp Zabel , Olof Johansson , SoC Team , Dinh Nguyen , Pratyush Yadav , Tudor Ambarus , Linux I2C , Linux Kernel Mailing List , Sebastian Reichel , "Leizhen (ThunderTown)" , Jonathan Cameron , DTML , Linux ARM , ka@semihalf.com, Tomasz Nowicki , jam@semihalf.com, amstan@google.com Subject: Re: [PATCH v2 2/4] dt-bindings: add bus number property Message-ID: References: <20211005143748.2471647-1-pan@semihalf.com> <20211005143748.2471647-3-pan@semihalf.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/10/2021 18:22:12+0200, Arnd Bergmann wrote: > On Tue, Oct 5, 2021 at 4:37 PM Paweł Anikiel wrote: > > > > On SoCFPGA systems, it's desireable to have fixed numbering for > > i2c busses, while being able to enable/disable them (e.g. have i2c1 > > be mapped to /dev/i2c-1, even though i2c0 is disabled). This can also > > be achieved using devicetree aliases (see i2c_add_adapter). However, > > having the driver be self-contained without relying on aliases is more > > robust. > > > > Signed-off-by: Paweł Anikiel > > I don't see how adding a nonstandard property in one of the i2c bus > drivers helps at all. How do you expect this to work when there are > multiple i2c controllers in the system using different drivers? What > should happen if both an alias and the busno property are set? > What happens when two nodes have the same busno property because e.g. one is in a dtsi and the other one is in a dts? -- Alexandre Belloni, co-owner and COO, Bootlin Embedded Linux and Kernel engineering https://bootlin.com 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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5DF33C433F5 for ; Tue, 5 Oct 2021 16:30:04 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 2EAA961381 for ; Tue, 5 Oct 2021 16:30:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 2EAA961381 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bootlin.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Dxw1N+ZLDrJh/C9eBPeexkRfYBYUcyptptWvPjcswaY=; b=YlXGDfG9Oo5xaB UIte8nnbuqvFzRno23R88x4rFRytnFmM0KIa/x1D0gTAle/PgFm/234wAdDs29Cqd0KQMysKGEj0n r6Wr9Tga+YH4XkWw9gx0rU7fWvJeNnJuuk+V6On7KMBCnLRMLJbu9SIYrRE7Xg72fcOoP3MClOYYw enWupIP0fvm67Ox3RbY3lioH4OW5B6VxwWwCmWOnsQ9KgyDRfR7WHCMG2LZLhEOpDG1fhMANFxRuJ jpJmtISDL53HJp2E922kk9edWB4UOk1Mxj1fb9P+7GKjsbDZiNsss9eqGbtfZnlFNKZM8GGA6hv9L HmYMT6DiuOA2u5TOI/YQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mXnIp-00BHYH-P1; Tue, 05 Oct 2021 16:28:27 +0000 Received: from relay9-d.mail.gandi.net ([217.70.183.199]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mXnIm-00BHXm-4O for linux-arm-kernel@lists.infradead.org; Tue, 05 Oct 2021 16:28:26 +0000 Received: (Authenticated sender: alexandre.belloni@bootlin.com) by relay9-d.mail.gandi.net (Postfix) with ESMTPSA id CD54AFF806; Tue, 5 Oct 2021 16:28:16 +0000 (UTC) Date: Tue, 5 Oct 2021 18:28:16 +0200 From: Alexandre Belloni To: Arnd Bergmann List-Id: Cc: =?utf-8?B?UGF3ZcWC?= Anikiel , jarkko.nikula@linux.intel.com, Andy Shevchenko , Mika Westerberg , Rob Herring , Philipp Zabel , Olof Johansson , SoC Team , Dinh Nguyen , Pratyush Yadav , Tudor Ambarus , Linux I2C , Linux Kernel Mailing List , Sebastian Reichel , "Leizhen (ThunderTown)" , Jonathan Cameron , DTML , Linux ARM , ka@semihalf.com, Tomasz Nowicki , jam@semihalf.com, amstan@google.com Subject: Re: [PATCH v2 2/4] dt-bindings: add bus number property Message-ID: References: <20211005143748.2471647-1-pan@semihalf.com> <20211005143748.2471647-3-pan@semihalf.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211005_092824_354007_F2177641 X-CRM114-Status: GOOD ( 16.07 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Message-ID: <20211005162816.BPDIv2pF16bxw77sA5vfuNPngDocmoVgJebhwWNW2TA@z> T24gMDUvMTAvMjAyMSAxODoyMjoxMiswMjAwLCBBcm5kIEJlcmdtYW5uIHdyb3RlOgo+IE9uIFR1 ZSwgT2N0IDUsIDIwMjEgYXQgNDozNyBQTSBQYXdlxYIgQW5pa2llbCA8cGFuQHNlbWloYWxmLmNv bT4gd3JvdGU6Cj4gPgo+ID4gT24gU29DRlBHQSBzeXN0ZW1zLCBpdCdzIGRlc2lyZWFibGUgdG8g aGF2ZSBmaXhlZCBudW1iZXJpbmcgZm9yCj4gPiBpMmMgYnVzc2VzLCB3aGlsZSBiZWluZyBhYmxl IHRvIGVuYWJsZS9kaXNhYmxlIHRoZW0gKGUuZy4gaGF2ZSBpMmMxCj4gPiBiZSBtYXBwZWQgdG8g L2Rldi9pMmMtMSwgZXZlbiB0aG91Z2ggaTJjMCBpcyBkaXNhYmxlZCkuIFRoaXMgY2FuIGFsc28K PiA+IGJlIGFjaGlldmVkIHVzaW5nIGRldmljZXRyZWUgYWxpYXNlcyAoc2VlIGkyY19hZGRfYWRh cHRlcikuIEhvd2V2ZXIsCj4gPiBoYXZpbmcgdGhlIGRyaXZlciBiZSBzZWxmLWNvbnRhaW5lZCB3 aXRob3V0IHJlbHlpbmcgb24gYWxpYXNlcyBpcyBtb3JlCj4gPiByb2J1c3QuCj4gPgo+ID4gU2ln bmVkLW9mZi1ieTogUGF3ZcWCIEFuaWtpZWwgPHBhbkBzZW1paGFsZi5jb20+Cj4gCj4gSSBkb24n dCBzZWUgaG93IGFkZGluZyBhIG5vbnN0YW5kYXJkIHByb3BlcnR5IGluIG9uZSBvZiB0aGUgaTJj IGJ1cwo+IGRyaXZlcnMgaGVscHMgYXQgYWxsLiBIb3cgZG8geW91IGV4cGVjdCB0aGlzIHRvIHdv cmsgd2hlbiB0aGVyZSBhcmUKPiBtdWx0aXBsZSBpMmMgY29udHJvbGxlcnMgaW4gdGhlIHN5c3Rl bSB1c2luZyBkaWZmZXJlbnQgZHJpdmVycz8gV2hhdAo+IHNob3VsZCBoYXBwZW4gaWYgYm90aCBh biBhbGlhcyBhbmQgdGhlIGJ1c25vIHByb3BlcnR5IGFyZSBzZXQ/Cj4gCgpXaGF0IGhhcHBlbnMg d2hlbiB0d28gbm9kZXMgaGF2ZSB0aGUgc2FtZSBidXNubyBwcm9wZXJ0eSBiZWNhdXNlIGUuZy4K b25lIGlzIGluIGEgZHRzaSBhbmQgdGhlIG90aGVyIG9uZSBpcyBpbiBhIGR0cz8KCgotLSAKQWxl eGFuZHJlIEJlbGxvbmksIGNvLW93bmVyIGFuZCBDT08sIEJvb3RsaW4KRW1iZWRkZWQgTGludXgg YW5kIEtlcm5lbCBlbmdpbmVlcmluZwpodHRwczovL2Jvb3RsaW4uY29tCgpfX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpsaW51eC1hcm0ta2VybmVsIG1haWxp bmcgbGlzdApsaW51eC1hcm0ta2VybmVsQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3Rz LmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1hcm0ta2VybmVsCg==