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Sun, 26 Jul 2020 09:06:19 -0700 (PDT) Received: from kozik-lap ([194.230.155.213]) by smtp.googlemail.com with ESMTPSA id sd8sm3385328ejb.58.2020.07.26.09.06.18 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Sun, 26 Jul 2020 09:06:18 -0700 (PDT) Date: Sun, 26 Jul 2020 18:06:16 +0200 From: Krzysztof Kozlowski To: Arnd Bergmann Subject: Re: [PATCH v3 2/2] mtd: rawnand: ingenic: Limit MTD_NAND_JZ4780 to architecture only Message-ID: <20200726160616.GA2662@kozik-lap> References: <20200724145401.2566-1-krzk@kernel.org> <20200724145401.2566-3-krzk@kernel.org> <20200724155436.GA7460@kozik-lap> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200726_120623_100836_99C636A0 X-CRM114-Status: GOOD ( 22.44 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Vignesh Raghavendra , Richard Weinberger , "linux-kernel@vger.kernel.org" , Paul Cercueil , Harvey Hunt , linux-mtd , Miquel Raynal Content-Type: text/plain; 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Sun, 26 Jul 2020 09:06:18 -0700 (PDT) Date: Sun, 26 Jul 2020 18:06:16 +0200 From: Krzysztof Kozlowski To: Arnd Bergmann Cc: Paul Cercueil , Harvey Hunt , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , "linux-kernel@vger.kernel.org" , linux-mtd Subject: Re: [PATCH v3 2/2] mtd: rawnand: ingenic: Limit MTD_NAND_JZ4780 to architecture only Message-ID: <20200726160616.GA2662@kozik-lap> References: <20200724145401.2566-1-krzk@kernel.org> <20200724145401.2566-3-krzk@kernel.org> <20200724155436.GA7460@kozik-lap> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8BIT In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Jul 25, 2020 at 08:30:56PM +0200, Arnd Bergmann wrote: > On Sat, Jul 25, 2020 at 2:17 PM Paul Cercueil wrote: > > Le ven. 24 juil. 2020 à 17:54, Krzysztof Kozlowski a > > écrit : > > > On Fri, Jul 24, 2020 at 05:50:06PM +0200, Paul Cercueil wrote: > > >> Le ven. 24 juil. 2020 à 17:33, Krzysztof Kozlowski > > >> a écrit: > > >> > On Fri, 24 Jul 2020 at 17:19, Paul Cercueil > > >> > wrote: > > >> > > >> On MIPS, the SoC selection is a Kconfig "choice", so you can only > > >> support > > >> one SoC family, unfortunately. > > > > > > Let's say someone selected then some other architecture > > > (MIPS_ALCHEMY). > > > They could select this MTD driver. > > > > > > Does it mean they would be able to run it on Ingenic hardware? > > > > In *theory* yes, as long as the Kconfig options that MACH_INGENIC > > selects are enabled, the kernel should boot and work on Ingenic SoCs. > > Right now, this won't work yet, because there are platform specific > functions that are implemented by each of the platforms in arch/mips, > e.g. arch/mips/generic/init.c and arch/mips/jz4740/setup.c. I would say even more - no DTS would be provided for such configuration. All Ingenic DTSes are included only with MACH_INGENIC. You cannot build a kernel working on Ingenic without MACH_INGENIC. Even in theory. > > A lot of the newer platforms are part of arch/mips/generic > (CONFIG_MIPS_GENERIC), which roughly corresponds to > CONFIG_ARCH_MULTIPLATFORM on in arch/arm/. > Similarly, there are header files in arch/mips/include/asm/mach-*/ > that conflict and you need to have the right one. > > To have more than one platform enabled, each one needs to > have all of that platform code converted to fit into the > MIPS_GENERIC framework. This can be a lot of work, but > I suppose the ingenic platform would be a candidate for > which this makes sense, as long as new SoCs of that family > still come out. I can therefore change the patch to: depends on MACH_INGENIC || MIPS_GENERIC || COMPILE_TEST Other solution is to leave MTD driver as is and for the memory driver go with my v2 approach: https://lore.kernel.org/lkml/20200724074038.5597-6-krzk@kernel.org/ Best regards, Krzysztof