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[203.139.65.40]) by smtp.gmail.com with UTF8SMTPSA id d9443c01a7336-2d14dbeaad6sm31374505ad.51.2026.08.10.01.28.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Aug 2026 01:28:44 -0700 (PDT) Date: Mon, 10 Aug 2026 17:28:32 +0900 From: Dominique MARTINET To: Md Sadre Alam Cc: miquel.raynal@bootlin.com, richard@nod.at, vigneshr@ti.com, tudor.ambarus@linaro.org, s-k6@ti.com, linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, varadarajan.narayanan@oss.qualcomm.com Subject: Re: [PATCH 1/2] mtd: spinand: winbond: add support for W25N04LW Message-ID: References: <20260807064339.1632249-1-md.alam@oss.qualcomm.com> <20260807064339.1632249-2-md.alam@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20260807064339.1632249-2-md.alam@oss.qualcomm.com> Md Sadre Alam wrote on Fri, Aug 07, 2026 at 12:13:38PM +0530: > Add support for Winbond W25N04LW 4Gbit SPI-NAND. > It has 8-bit on-die ECC and a 4096+256 byte page > (4096 byte main area, 128 byte usable OOB once > on-chip ECC hides the 128 byte parity area), > organized as 2048 blocks of 64 pages each, unlike > the existing 2048 byte page W25N04KV/W25N04KW parts. This is pretty good timing, I was just looking at sending a patch for W25N04LW myself! I agree with Miquèl that your patch looks odd, you wrote > + NAND_MEMORG(1, 4096, 128, 64, 2048, 40, 1, 1, 1), but the erase blocks are 256K long so it should be + NAND_MEMORG(1, 4096, 256, 64, 2048, 40, 1, 1, 1), did you actually test this device? If it helps, the datasheet for W25N04LWZExx / W25N04LWTBxx is freely available from digikey here[1] [1] https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/7182/W25N04LWZExx_W25N04LWTBxx_RevD_2025-08-05.pdf (And it also supports continuous read, so I'm curious to see if it'd work with the recent continous read support from Miquèl[2] merged in 7.2... I'm not familiar with the subsystem so will need a bit of time to plug all the hooks in properly) [2] https://lore.kernel.org/linux-mtd/20260429-winbond-v6-18-rc1-cont-read-v3-0-0f38b3c229ad@bootlin.com/ FWIW, I've confirmed it works with the following diff (at least up to the point of creating an ubi volume and booting from it); happy to send this as a patch if this has indeed not been tested ------------ diff --git a/drivers/mtd/nand/spi/winbond.c b/drivers/mtd/nand/spi/winbond.c index 9b78c1e6cbc9..43a4886dc4a5 100644 --- a/drivers/mtd/nand/spi/winbond.c +++ b/drivers/mtd/nand/spi/winbond.c @@ -335,6 +335,30 @@ static int w25n02kv_ooblayout_free(struct mtd_info *mtd, int section, return 0; } +static int w25n04lw_ooblayout_ecc(struct mtd_info *mtd, int section, + struct mtd_oob_region *region) +{ + if (section > 7) + return -ERANGE; + + region->offset = 128 + (16 * section); + region->length = 13; + + return 0; +} + +static int w25n04lw_ooblayout_free(struct mtd_info *mtd, int section, + struct mtd_oob_region *region) +{ + if (section > 7) + return -ERANGE; + + region->offset = (16 * section) + 2; + region->length = 14; + + return 0; +} + static const struct mtd_ooblayout_ops w25n01kv_ooblayout = { .ecc = w25n01kv_ooblayout_ecc, .free = w25n02kv_ooblayout_free, @@ -345,6 +369,11 @@ static const struct mtd_ooblayout_ops w25n02kv_ooblayout = { .free = w25n02kv_ooblayout_free, }; +static const struct mtd_ooblayout_ops w25n04lw_ooblayout = { + .ecc = w25n04lw_ooblayout_ecc, + .free = w25n04lw_ooblayout_free, +}; + static int w25n01jw_ooblayout_ecc(struct mtd_info *mtd, int section, struct mtd_oob_region *region) { @@ -768,6 +797,15 @@ static const struct spinand_info winbond_spinand_table[] = { &update_cache_variants), 0, SPINAND_ECCINFO(&w25n02kv_ooblayout, w25n02kv_ecc_get_status)), + SPINAND_INFO("W25N04LW", /* 1.8V */ + SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xb2, 0x23), + NAND_MEMORG(1, 4096, 256, 64, 2048, 40, 1, 1, 1), + NAND_ECCREQ(8, 512), + SPINAND_INFO_OP_VARIANTS(&read_cache_variants, + &write_cache_variants, + &update_cache_variants), + 0, + SPINAND_ECCINFO(&w25n04lw_ooblayout, w25n02kv_ecc_get_status)), SPINAND_INFO("W35N04JW", /* 1.8V */ SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xdf, 0x23), NAND_MEMORG(1, 4096, 128, 64, 512, 10, 1, 4, 1), ----------------- Thanks, -- Dominique Martinet | Asmadeus