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Sun, 26 Jul 2020 09:15:48 -0700 (PDT) Received: from kozik-lap ([194.230.155.213]) by smtp.googlemail.com with ESMTPSA id i5sm5055198ejg.121.2020.07.26.09.15.47 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Sun, 26 Jul 2020 09:15:47 -0700 (PDT) Date: Sun, 26 Jul 2020 18:15:45 +0200 From: Krzysztof Kozlowski To: Paul Cercueil Subject: Re: [PATCH v3 2/2] mtd: rawnand: ingenic: Limit MTD_NAND_JZ4780 to architecture only Message-ID: <20200726161545.GA6058@kozik-lap> References: <20200724145401.2566-1-krzk@kernel.org> <20200724145401.2566-3-krzk@kernel.org> <20200724155436.GA7460@kozik-lap> <20200726160616.GA2662@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_121550_420190_554409B1 X-CRM114-Status: GOOD ( 21.35 ) 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 , Arnd Bergmann , Richard Weinberger , linux-kernel@vger.kernel.org, Harvey Hunt , linux-mtd , Miquel Raynal Content-Type: text/plain; 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Sun, 26 Jul 2020 09:15:47 -0700 (PDT) Date: Sun, 26 Jul 2020 18:15:45 +0200 From: Krzysztof Kozlowski To: Paul Cercueil Cc: Arnd Bergmann , 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: <20200726161545.GA6058@kozik-lap> References: <20200724145401.2566-1-krzk@kernel.org> <20200724145401.2566-3-krzk@kernel.org> <20200724155436.GA7460@kozik-lap> <20200726160616.GA2662@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 Sun, Jul 26, 2020 at 06:12:27PM +0200, Paul Cercueil wrote: > > > Le dim. 26 juil. 2020 à 18:06, Krzysztof Kozlowski a écrit > : > > 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. > > But the devicetree doesn't have to be built-in. > OK, that's true. Anyway, I don't have strong opinion on any of this. I just followed Arnd's hint. For the memory driver (and MTD NAND as well) which one you prefer: 1. https://lore.kernel.org/lkml/20200724074038.5597-6-krzk@kernel.org/ 2. depends on MACH_INGENIC || MIPS_GENERIC || COMPILE_TEST ? Best regards, Krzysztof