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Fri, 27 Jan 2023 08:15:27 -0800 (PST) Received: from [192.168.1.109] ([178.197.216.144]) by smtp.gmail.com with ESMTPSA id ip7-20020a05600ca68700b003dc433bb5e1sm427854wmb.9.2023.01.27.08.15.25 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 27 Jan 2023 08:15:26 -0800 (PST) Message-ID: Date: Fri, 27 Jan 2023 17:15:24 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.7.1 Subject: Re: [PATCH v9 07/10] arm64: dts: ls1046ardb: Add serdes bindings Content-Language: en-US To: Sean Anderson , Shawn Guo References: <20221230000139.2846763-1-sean.anderson@seco.com> <20221230000139.2846763-8-sean.anderson@seco.com> <20230125234335.GC20713@T480> <8074f0be-8a70-a937-49f2-123e0bfc6218@seco.com> <20230127075248.GL20713@T480> <20a9070f-9673-2f51-97df-68e78c37d894@seco.com> From: Krzysztof Kozlowski In-Reply-To: <20a9070f-9673-2f51-97df-68e78c37d894@seco.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kishon Vijay Abraham I , devicetree@vger.kernel.org, Krzysztof Kozlowski , Madalin Bucur , Li Yang , Vinod Koul , Rob Herring , Camelia Alexandra Groza , Bagas Sanjaya , Ioana Ciornei , linux-phy@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 27/01/2023 17:11, Sean Anderson wrote: >>>>> >>>>> .../boot/dts/freescale/fsl-ls1046a-rdb.dts | 112 ++++++++++++++++++ >>>>> drivers/phy/freescale/Kconfig | 1 + >>>> >>>> The phy driver Kconfig change shouldn't be part of this patch. >>> >>> I put it here for bisectability, since this is the point where we need >>> to enable it. But I can do this in a separate patch if you want. >> >> From DT ABI perspective, it's already broken anyway if you need to change >> kernel and DT atomically. > > AIUI new kernels must work with old device trees, but new device trees need not > work with old kernels. So a change like this is fine, since the kernel won't > touch the serdes if it isn't supplied. You used the argument "bisectability". If the patchset is not bisectable, the ABI is broken. Best regards, Krzysztof