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Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.43; Wed, 1 Jul 2026 03:10:54 +0200 Received: from MUCSE815.infineon.com ([fe80::b54c:c0bd:546c:c9be]) by MUCSE815.infineon.com ([fe80::b54c:c0bd:546c:c9be%12]) with mapi id 15.02.2562.043; Wed, 1 Jul 2026 03:10:54 +0200 From: To: , , , CC: , , , , , Subject: RE: [PATCH v2 1/3] Revert "mtd: spi-nor: remove Fujitsu MB85RS1MT support" Thread-Topic: [PATCH v2 1/3] Revert "mtd: spi-nor: remove Fujitsu MB85RS1MT support" Thread-Index: AQHdBRKBdcAN9mfv+k6bdaeZDwvjfLZWt11QgADFb4CAAFitgA== Date: Wed, 1 Jul 2026 01:10:54 +0000 Message-ID: <2b8390c0aaae4203af318f9a5edbb0eb@infineon.com> References: <20260626022108.1963271-2-ronan.dalton@alliedtelesis.co.nz> <858120735ba04d77a422adbc37135ecd@infineon.com> <4efb1cf9-dfd7-432f-b95e-3075507a8eb0@alliedtelesis.co.nz> In-Reply-To: <4efb1cf9-dfd7-432f-b95e-3075507a8eb0@alliedtelesis.co.nz> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.161.6.196] MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260630_181158_205734_DDF9D263 X-CRM114-Status: GOOD ( 32.04 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 Hi, > Hi Takahiro, > > On 30/06/2026 19:47, Takahiro.Kuwano@infineon.com wrote: > > Hi, > > > >> This reverts commit d9cd5c9a6fe26d544551cfaa94fb0abc50c0b895. > >> > >> The commit that removed support for this chip claimed that the at25 > >> driver was the correct driver to use for this chip. However, the at25 > >> driver exposes the chip as an NVMEM device, not a MTD device, so it's > >> not a suitable replacement for users that want to mount a file system > >> over the chip. > >> > > What file system do you use? > > The size of FRAM chips (hundreds of KB) sounds too small for file > > systems. > > We're using ext2. Technically we want this for the MB85RS4MT which is > added in patch 3 of this series. > We don't add any FRAM chips in SPI-NOR... > The use is for a small amount of additional storage separate to the main > system NAND flash for some small "critical" files that we don't want to > lose. We've been using devices like the mchp23lcv1024 and mr25h40 on > other products for some time. > For that use, how about using tmpfs with NVMEM backup? > >> Revert the change that removed support for the MB85RS1MT FRAM chip. > >> > >> Signed-off-by: Ronan Dalton > >> Cc: linux-kernel@vger.kernel.org > >> Cc: linux-mtd@lists.infradead.org > >> Cc: Pratyush Yadav > >> Cc: Michael Walle > >> Cc: Takahiro Kuwano > >> Cc: Miquel Raynal > >> Cc: Richard Weinberger > >> Cc: Vignesh Raghavendra > >> Cc: Chris Packham > >> Cc: Aryan Srivastava > >> --- > >> Changes in v2: > >> - No changes > >> > >> drivers/mtd/spi-nor/Makefile | 1 + > >> drivers/mtd/spi-nor/core.c | 1 + > >> drivers/mtd/spi-nor/core.h | 1 + > >> drivers/mtd/spi-nor/fujitsu.c | 21 +++++++++++++++++++++ > >> 4 files changed, 24 insertions(+) > >> create mode 100644 drivers/mtd/spi-nor/fujitsu.c > >> > >> diff --git a/drivers/mtd/spi-nor/Makefile b/drivers/mtd/spi-nor/Makefile > >> index 5dd9c35f6b6f..9216a5a29a2b 100644 > >> --- a/drivers/mtd/spi-nor/Makefile > >> +++ b/drivers/mtd/spi-nor/Makefile > >> @@ -5,6 +5,7 @@ spi-nor-objs += atmel.o > >> spi-nor-objs += eon.o > >> spi-nor-objs += esmt.o > >> spi-nor-objs += everspin.o > >> +spi-nor-objs += fujitsu.o > >> spi-nor-objs += gigadevice.o > >> spi-nor-objs += intel.o > >> spi-nor-objs += issi.o > >> diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c > >> index ccf4396cdcd0..d5ebbfd3fa7f 100644 > >> --- a/drivers/mtd/spi-nor/core.c > >> +++ b/drivers/mtd/spi-nor/core.c > >> @@ -2009,6 +2009,7 @@ static const struct spi_nor_manufacturer *manufacturers[] = { > >> &spi_nor_eon, > >> &spi_nor_esmt, > >> &spi_nor_everspin, > >> + &spi_nor_fujitsu, > >> &spi_nor_gigadevice, > >> &spi_nor_intel, > >> &spi_nor_issi, > >> diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h > >> index ba2d1a862c9d..a4d906e6d07d 100644 > >> --- a/drivers/mtd/spi-nor/core.h > >> +++ b/drivers/mtd/spi-nor/core.h > >> @@ -606,6 +606,7 @@ extern const struct spi_nor_manufacturer spi_nor_atmel; > >> extern const struct spi_nor_manufacturer spi_nor_eon; > >> extern const struct spi_nor_manufacturer spi_nor_esmt; > >> extern const struct spi_nor_manufacturer spi_nor_everspin; > >> +extern const struct spi_nor_manufacturer spi_nor_fujitsu; > >> extern const struct spi_nor_manufacturer spi_nor_gigadevice; > >> extern const struct spi_nor_manufacturer spi_nor_intel; > >> extern const struct spi_nor_manufacturer spi_nor_issi; > >> diff --git a/drivers/mtd/spi-nor/fujitsu.c b/drivers/mtd/spi-nor/fujitsu.c > >> new file mode 100644 > >> index 000000000000..69cffc5c73ef > >> --- /dev/null > >> +++ b/drivers/mtd/spi-nor/fujitsu.c > >> @@ -0,0 +1,21 @@ > >> +// SPDX-License-Identifier: GPL-2.0 > >> +/* > >> + * Copyright (C) 2005, Intec Automation Inc. > >> + * Copyright (C) 2014, Freescale Semiconductor, Inc. > >> + */ > >> + > >> +#include > >> + > >> +#include "core.h" > >> + > >> +static const struct flash_info fujitsu_nor_parts[] = { > >> + /* Fujitsu */ > >> + { "mb85rs1mt", INFO(0x047f27, 0, 128 * 1024, 1) > >> + FLAGS(SPI_NOR_NO_ERASE) }, > >> +}; > >> + > >> +const struct spi_nor_manufacturer spi_nor_fujitsu = { > >> + .name = "fujitsu", > >> + .parts = fujitsu_nor_parts, > >> + .nparts = ARRAY_SIZE(fujitsu_nor_parts), > >> +}; > >> -- > >> 2.54.0 > > Thanks, > > Takahiro > > ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/