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Thu, 7 May 2020 18:13:57 +0000 From: "Daniel Walker (danielwa)" To: Pratyush Yadav Subject: Re: [RFC-PATCH] mtd: spi-nor: add conditional 4B opcodes Thread-Topic: [RFC-PATCH] mtd: spi-nor: add conditional 4B opcodes Thread-Index: AQHWJJtGYFQgheIq+0WUH0ne4iHf/w== Date: Thu, 7 May 2020 18:13:57 +0000 Message-ID: <20200507181356.GZ9016@zorba> References: <20200507162047.30788-1-danielwa@cisco.com> <20200507180346.gwni4hf6kb6gd2e5@yadavpratyush.com> In-Reply-To: <20200507180346.gwni4hf6kb6gd2e5@yadavpratyush.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-Auto-Response-Suppress: DR, OOF, AutoReply X-MS-TNEF-Correlator: user-agent: Mutt/1.9.4 (2018-02-28) authentication-results: yadavpratyush.com; dkim=none (message not signed) header.d=none;yadavpratyush.com; dmarc=none action=none header.from=cisco.com; x-originating-ip: [128.107.241.180] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 0371217d-c7b8-4349-ccb6-08d7f2b26931 x-ms-traffictypediagnostic: BYAPR11MB2982: x-ld-processed: 5ae1af62-9505-4097-a69a-c1553ef7840e,ExtAddr x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org On Thu, May 07, 2020 at 11:33:46PM +0530, Pratyush Yadav wrote: > On 07/05/20 09:20AM, Daniel Walker wrote: > > Some chips have 4B opcodes, but there is no way to know if they have > > them. This device tree option allows platform owners to force enable 4b > > opcodes when they know their chips support it even when it can be > > automatically identified. > > Do you mean that two chips might have the same ID but one of them can > support 4B opcodes and the other can not? Is it possible to detect this > in a fixup hook? I think it would be better to do something like this in > a fixup hook instead of via device tree. Yes. The chip I added the option for is an example of this, it's n25q256a. I'm not familiar with the fixup hook mechanism, but I would assume you need some way to tell between the 4B opcode chips and the non-4B opcode chips. For n25q256a, we have not found a way to do that. Daniel ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/