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Fri, 16 Jun 2023 01:15:33 -0700 (PDT) Received: from [192.168.1.20] ([178.197.219.26]) by smtp.gmail.com with ESMTPSA id r4-20020a170906a20400b00982c0ac984asm1418708ejy.176.2023.06.16.01.15.31 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 16 Jun 2023 01:15:33 -0700 (PDT) Message-ID: <781c1db2-ecca-901a-4e11-7f7c68cf744d@linaro.org> Date: Fri, 16 Jun 2023 10:15:31 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.12.0 Subject: Re: [PATCH v9 3/3] dt-bindings: mtd: marvell-nand: Convert to YAML DT scheme Content-Language: en-US To: Chris Packham , "miquel.raynal@bootlin.com" , "richard@nod.at" , "vigneshr@ti.com" , "robh+dt@kernel.org" , "krzysztof.kozlowski+dt@linaro.org" , "andrew@lunn.ch" , "gregory.clement@bootlin.com" , "sebastian.hesselbarth@gmail.com" Cc: "linux-mtd@lists.infradead.org" , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , Vadym Kochan References: <20230615040447.3484564-1-chris.packham@alliedtelesis.co.nz> <20230615040447.3484564-4-chris.packham@alliedtelesis.co.nz> <1863cd53-9846-def2-ee5f-f4a51160ed8d@alliedtelesis.co.nz> From: Krzysztof Kozlowski In-Reply-To: <1863cd53-9846-def2-ee5f-f4a51160ed8d@alliedtelesis.co.nz> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230616_011535_568186_87FE9D2C X-CRM114-Status: GOOD ( 14.37 ) 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; 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Fri, 16 Jun 2023 01:15:33 -0700 (PDT) Received: from [192.168.1.20] ([178.197.219.26]) by smtp.gmail.com with ESMTPSA id r4-20020a170906a20400b00982c0ac984asm1418708ejy.176.2023.06.16.01.15.31 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 16 Jun 2023 01:15:33 -0700 (PDT) Message-ID: <781c1db2-ecca-901a-4e11-7f7c68cf744d@linaro.org> Date: Fri, 16 Jun 2023 10:15:31 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.12.0 Subject: Re: [PATCH v9 3/3] dt-bindings: mtd: marvell-nand: Convert to YAML DT scheme Content-Language: en-US To: Chris Packham , "miquel.raynal@bootlin.com" , "richard@nod.at" , "vigneshr@ti.com" , "robh+dt@kernel.org" , "krzysztof.kozlowski+dt@linaro.org" , "andrew@lunn.ch" , "gregory.clement@bootlin.com" , "sebastian.hesselbarth@gmail.com" Cc: "linux-mtd@lists.infradead.org" , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , Vadym Kochan References: <20230615040447.3484564-1-chris.packham@alliedtelesis.co.nz> <20230615040447.3484564-4-chris.packham@alliedtelesis.co.nz> <1863cd53-9846-def2-ee5f-f4a51160ed8d@alliedtelesis.co.nz> From: Krzysztof Kozlowski In-Reply-To: <1863cd53-9846-def2-ee5f-f4a51160ed8d@alliedtelesis.co.nz> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On 15/06/2023 23:06, Chris Packham wrote: >> >>> + >>> +properties: >>> + compatible: >>> + oneOf: >>> + - items: >>> + - const: marvell,armada-8k-nand-controller >>> + - const: marvell,armada370-nand-controller >>> + - enum: >>> + - marvell,armada-8k-nand-controller >> This is wrong. 8k cannot be both: compatible and not compatible with >> 370. It's not someone's cat to be in both states at the same time... > > The correct state (IMHO, Miquel correct me if I'm wrong) is `compatible > = "marvell,armada-8k-nand-controller";`  as there are some 8K specific > requirements that aren't present on the 370 (specifically the > system-controller and the 2nd clock). Presence of specific requirements does not invalidate compatibility. Two devices are compatible if the 8k can bind and work with 370 compatible string, even if this means some lower performance or less features (e.g. subset of features). Now whether they are really compatible or not - I don't know. I expect the answer from you (as plural you). > The only reason `compatible = > "marvell,armada-8k-nand-controller", > "marvell,armada370-nand-controller";` is supported is because that is > what is in use in the existing dtses. Fix the DTS, use here the correct combination and, if it is a deviation from old binding, mention this in commit msg. Best regards, Krzysztof