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Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jQTfp-0007Ri-GV; Mon, 20 Apr 2020 10:29:09 +0000 Received: from bhuna.collabora.co.uk ([46.235.227.227]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jQTfl-0007Q4-BU for linux-mtd@lists.infradead.org; Mon, 20 Apr 2020 10:29:08 +0000 Received: from localhost (unknown [IPv6:2a01:e0a:2c:6930:5cf4:84a1:2763:fe0d]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: bbrezillon) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id 9AA0B2A0057; Mon, 20 Apr 2020 11:29:02 +0100 (BST) Date: Mon, 20 Apr 2020 12:28:59 +0200 From: Boris Brezillon To: Andy Shevchenko Subject: Re: [PATCH v2 2/2] mtd: rawnand: Add NAND controller support on Intel LGM SoC Message-ID: <20200420122859.2a210268@collabora.com> In-Reply-To: References: <20200417082147.43384-1-vadivel.muruganx.ramuthevar@linux.intel.com> <20200417082147.43384-3-vadivel.muruganx.ramuthevar@linux.intel.com> <20200418105533.477ce529@collabora.com> <20200419222040.GJ185537@smile.fi.intel.com> <20200420111754.5863324b@collabora.com> <20200420115256.3a0ff647@collabora.com> Organization: Collabora X-Mailer: Claws Mail 3.17.5 (GTK+ 2.24.32; x86_64-redhat-linux-gnu) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200420_032905_525162_0F516E78 X-CRM114-Status: GOOD ( 20.21 ) 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: cheol.yong.kim@intel.com, devicetree , qi-ming.wu@intel.com, Anders Roxell , Andy Shevchenko , Arnd Bergmann , "hauke.mehrtens" , Richard Weinberger , Brendan Higgins , Linux Kernel Mailing List , linux-mips@vger.kernel.org, "Ramuthevar, Vadivel MuruganX" , Rob Herring , "open list:MEMORY TECHNOLOGY..." , Miquel Raynal , Thomas Gleixner , masonccyang@mxic.com.tw, piotrs@cadence.com, Vignesh R Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org On Mon, 20 Apr 2020 13:14:42 +0300 Andy Shevchenko wrote: > On Mon, Apr 20, 2020 at 12:53 PM Boris Brezillon > wrote: > > On Mon, 20 Apr 2020 12:44:51 +0300 > > Andy Shevchenko wrote: > > > > > On Mon, Apr 20, 2020 at 12:21 PM Boris Brezillon > > > wrote: > > > > On Mon, 20 Apr 2020 01:20:40 +0300 > > > > Andy Shevchenko wrote: > > > > > On Sat, Apr 18, 2020 at 10:55:33AM +0200, Boris Brezillon wrote: > > > > > > On Fri, 17 Apr 2020 16:21:47 +0800 > > > > > > "Ramuthevar,Vadivel MuruganX" > > > > > > wrote: > > > > > > > > > > > > > From: Ramuthevar Vadivel Murugan > > > > > > > > > > > > +static const struct of_device_id lgm_nand_match[] = { > > > > > > > + { .compatible = "intel,lgm-nand", }, > > > > > > > + {} > > > > > > > +}; > > > > > > > +MODULE_DEVICE_TABLE(of, lgm_nand_match); > > > > > > > > > > > > You probably have a missing "depends on OF" in your Kconfig. > > > > > > > > > > Since it's using device property API, dependency is not needed. > > > > > > > > > > > > > There's no compile-time dependency, but this driver will be pretty > > > > useless if all its users have the NAND controller node defined in their > > > > DT and CONFIG_OF is not enabled. > > > > > > No, it's not. > > > See [1] for the details how ACPI may utilize this table. > > > > > > [1]: https://www.kernel.org/doc/html/latest/firmware-guide/acpi/enumeration.html#device-tree-namespace-link-device-id > > > > Except the NAND framework does use the OF lib when parsing common DT > > properties (like nand-ecc-mode, etc), so it does depend on OF if you > > want those props to be parsed, which, according to the DT binding patch, > > is the case. > > I see, so, NAND framework can be transformed at some point. In any > case, from driver perspective it's OF independent. > Well, it uses it only if the driver passes an OF node which this driver does (see the nand_set_flash_node() call), so no, it's really a driver dependency. ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/