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[66.90.144.107]) by smtp.gmail.com with ESMTPSA id tb7-20020a05687186c700b0017630fe87e5sm3404469oab.33.2023.03.20.09.01.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Mar 2023 09:01:39 -0700 (PDT) Received: (nullmailer pid 1764454 invoked by uid 1000); Mon, 20 Mar 2023 16:01:37 -0000 Date: Mon, 20 Mar 2023 11:01:37 -0500 From: Rob Herring To: Cristian Ciocaltea Cc: Conor Dooley , Krzysztof Kozlowski , Sudeep Holla , Cristian Marussi , Krzysztof Kozlowski , Greg Kroah-Hartman , Liam Girdwood , Mark Brown , Nicolas Frattaroli , Heiko Stuebner , Jaroslav Kysela , Takashi Iwai , Paul Walmsley , Palmer Dabbelt , Albert Ou , Daniel Drake , Katsuhiro Suzuki , linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, alsa-devel@alsa-project.org, linux-rockchip@lists.infradead.org, linux-riscv@lists.infradead.org, kernel@collabora.com Subject: Re: [PATCH 02/11] dt-bindings: serial: snps-dw-apb-uart: Relax dma-names order constraint Message-ID: <20230320160137.GB1755078-robh@kernel.org> References: <20230315114806.3819515-1-cristian.ciocaltea@collabora.com> <20230315114806.3819515-3-cristian.ciocaltea@collabora.com> <3679f2d0-55f0-1710-abc2-b268b6fc6969@linaro.org> <8ae57fe3-56aa-7e50-3eaa-a12a40657baf@collabora.com> <80796828-7b38-184a-2e8e-3cfe9158b67f@linaro.org> <13cb8dbd-994c-4b38-b715-44a3bf3d278d@spud> 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-20230320_090143_481361_42899E5E X-CRM114-Status: GOOD ( 28.73 ) 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="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 On Fri, Mar 17, 2023 at 07:43:53PM +0200, Cristian Ciocaltea wrote: > On 3/17/23 18:26, Conor Dooley wrote: > > On Fri, Mar 17, 2023 at 04:54:47PM +0100, Krzysztof Kozlowski wrote: > > > On 17/03/2023 11:21, Cristian Ciocaltea wrote: > > > > On 3/17/23 10:31, Krzysztof Kozlowski wrote: > > > > > On 15/03/2023 12:47, Cristian Ciocaltea wrote: > > > > > > Commit 370f696e4474 ("dt-bindings: serial: snps-dw-apb-uart: add dma & > > > > > > dma-names properties") documented dma-names property to handle Allwiner > > > > > > D1 dtbs_check warnings, but relies on a strict rx->tx ordering, which is > > > > > > the reverse of what a different board expects: > > > > > > > > > > > > rk3326-odroid-go2.dtb: serial@ff030000: dma-names:0: 'rx' was expected > > > > > > > > > > > > A quick and incomplete check shows the inconsistency is present in many > > > > > > other DT files: > > > > > > > > > > Why not fixing the DTS? The properties should have fixed order. > > > > > > > > I was initially concerned about the risk of a potential ABI breakage, > > > > but I think that's not really a problem since dma-names is not directly > > > > accessed in the driver and DT Kernel API doesn't rely on a particular order. > > > > > > > > If there are no objections, I would switch the order in the binding to > > > > tx->rx, since that's what most of the DTS use, and fix the remaining ones. > > > > > > Since we added the order recently, I rather assume it is the correct or > > > preferred one. > > > > IIRC I checked around the other serial bindings & there was not a > > consistent order that all serial bindings used, so I picked the order that > > was used across the various allwinner boards that do use dma-names. > > Thanks for clarifying this, Conor! Would it be fine to switch to tx->rx > order as it requires less changes to fix the inconsistencies? > > > Before changing dts files, it's probably a good idea to make sure that > > the dma-names are not used somewhere outside of Linux. > > Right, that means we cannot exclude the ABI breakage concern. Not sure how > easy would be to actually verify this. Hence I wonder if there is really no > chance to allow the flexible order in the binding.. If it changes and someone complains, then yes we'll allow flexible order. Rob _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel