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eeprom: move nvmem EEPROM drivers to drivers/nvmem/

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For historical reasons EEPROM drivers have lived under
drivers/misc/eeprom/. Also for historical reasons changes to most of
them would go through the char-misc tree while some would be queued
through the I2C tree. Over the years some of them have also been
converted to using nvmem - the dedicated subsystem for non-volatile
memory - while get_maintainer.pl does not Cc the maintainer of nvmem on
patches changing them.

Move the EEPROM drivers using nvmem under drivers/nvmem/ for
consistency of the review process and path upstream.

Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Signed-off-by: Srinivas Kandagatla <srini@kernel.org>
Link: https://patch.msgid.link/20260729094647.111468-11-srini@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bartosz Golaszewski
2026-07-29 10:46:43 +01:00
committed by Greg Kroah-Hartman
parent b594cbb7e8
commit cf09b7a056
10 changed files with 94 additions and 100 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
MAINTAINERS
View File

@@ -4176,11 +4176,11 @@ F: include/linux/async_tx.h
AT24 EEPROM DRIVER
M: Bartosz Golaszewski <brgl@kernel.org>
L: linux-i2c@vger.kernel.org
L: linux-kernel@vger.kernel.org
S: Maintained
T: git git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux.git
F: Documentation/devicetree/bindings/eeprom/at24.yaml
F: drivers/misc/eeprom/at24.c
F: drivers/nvmem/at24.c
ATA OVER ETHERNET (AOE) DRIVER
M: "Justin Sanders" <justin@coraid.com>

93
drivers/misc/eeprom/Kconfig
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@@ -1,52 +1,6 @@
# SPDX-License-Identifier: GPL-2.0-only
menu "EEPROM support"
config EEPROM_AT24
tristate "I2C EEPROMs / RAMs / ROMs from most vendors"
depends on I2C && SYSFS
select NVMEM
select NVMEM_SYSFS
select REGMAP
select REGMAP_I2C
help
Enable this driver to get read/write support to most I2C EEPROMs
and compatible devices like FRAMs, SRAMs, ROMs etc. After you
configure the driver to know about each chip on your target
board. Use these generic chip names, instead of vendor-specific
ones like at24c64, 24lc02 or fm24c04:
24c00, 24c01, 24c02, spd (readonly 24c02), 24c04, 24c08,
24c16, 24c32, 24c64, 24c128, 24c256, 24c512, 24c1024, 24c2048
Unless you like data loss puzzles, always be sure that any chip
you configure as a 24c32 (32 kbit) or larger is NOT really a
24c16 (16 kbit) or smaller, and vice versa. Marking the chip
as read-only won't help recover from this. Also, if your chip
has any software write-protect mechanism you may want to review the
code to make sure this driver won't turn it on by accident.
If you use this with an SMBus adapter instead of an I2C adapter,
full functionality is not available. Only smaller devices are
supported (24c16 and below, max 4 kByte).
This driver can also be built as a module. If so, the module
will be called at24.
config EEPROM_AT25
tristate "SPI EEPROMs (FRAMs) from most vendors"
depends on SPI && SYSFS
select NVMEM
select NVMEM_SYSFS
select SPI_MEM
help
Enable this driver to get read/write support to most SPI EEPROMs
and Cypress FRAMs,
after you configure the board init code to know about each eeprom
on your target board.
This driver can also be built as a module. If so, the module
will be called at25.
config EEPROM_MAX6875
tristate "Maxim MAX6874/5 power supply supervisor"
depends on I2C
@@ -69,22 +23,6 @@ config EEPROM_93CX6
If unsure, say N.
config EEPROM_93XX46
tristate "Microwire EEPROM 93XX46 support"
depends on SPI && SYSFS
select REGMAP
select NVMEM
select NVMEM_SYSFS
help
Driver for the microwire EEPROM chipsets 93xx46x. The driver
supports both read and write commands and also the command to
erase the whole EEPROM.
This driver can also be built as a module. If so, the module
will be called eeprom_93xx46.
If unsure, say N.
config EEPROM_DIGSY_MTC_CFG
bool "DigsyMTC display configuration EEPROMs device"
depends on GPIO_MPC5200 && SPI_GPIO
@@ -107,35 +45,4 @@ config EEPROM_IDT_89HPESX
This driver can also be built as a module. If so, the module
will be called idt_89hpesx.
config EEPROM_EE1004
tristate "SPD EEPROMs on DDR4 memory modules"
depends on I2C && SYSFS
select NVMEM
select NVMEM_SYSFS
help
Enable this driver to get read support to SPD EEPROMs following
the JEDEC EE1004 standard. These are typically found on DDR4
SDRAM memory modules.
This driver can also be built as a module. If so, the module
will be called ee1004.
config EEPROM_M24LR
tristate "STMicroelectronics M24LR RFID/NFC EEPROM support"
depends on I2C && SYSFS
select REGMAP_I2C
select NVMEM
select NVMEM_SYSFS
help
This enables support for STMicroelectronics M24LR RFID/NFC EEPROM
chips. These dual-interface devices expose two I2C addresses:
one for EEPROM memory access and another for control and system
configuration (e.g. UID, password handling).
This driver provides a sysfs interface for control functions and
integrates with the nvmem subsystem for EEPROM access.
To compile this driver as a module, choose M here: the
module will be called m24lr.
endmenu

5
drivers/misc/eeprom/Makefile
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@@ -1,10 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_EEPROM_AT24) += at24.o
obj-$(CONFIG_EEPROM_AT25) += at25.o
obj-$(CONFIG_EEPROM_MAX6875) += max6875.o
obj-$(CONFIG_EEPROM_93CX6) += eeprom_93cx6.o
obj-$(CONFIG_EEPROM_93XX46) += eeprom_93xx46.o
obj-$(CONFIG_EEPROM_DIGSY_MTC_CFG) += digsy_mtc_eeprom.o
obj-$(CONFIG_EEPROM_IDT_89HPESX) += idt_89hpesx.o
obj-$(CONFIG_EEPROM_EE1004) += ee1004.o
obj-$(CONFIG_EEPROM_M24LR) += m24lr.o

87
drivers/nvmem/Kconfig
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@@ -28,6 +28,93 @@ source "drivers/nvmem/layouts/Kconfig"
# Devices
if NVMEM_SYSFS
config EEPROM_AT24
tristate "I2C EEPROMs / RAMs / ROMs from most vendors"
depends on I2C && SYSFS
select REGMAP
select REGMAP_I2C
help
Enable this driver to get read/write support to most I2C EEPROMs
and compatible devices like FRAMs, SRAMs, ROMs etc. After you
configure the driver to know about each chip on your target
board. Use these generic chip names, instead of vendor-specific
ones like at24c64, 24lc02 or fm24c04:
24c00, 24c01, 24c02, spd (readonly 24c02), 24c04, 24c08,
24c16, 24c32, 24c64, 24c128, 24c256, 24c512, 24c1024, 24c2048
Unless you like data loss puzzles, always be sure that any chip
you configure as a 24c32 (32 kbit) or larger is NOT really a
24c16 (16 kbit) or smaller, and vice versa. Marking the chip
as read-only won't help recover from this. Also, if your chip
has any software write-protect mechanism you may want to review the
code to make sure this driver won't turn it on by accident.
If you use this with an SMBus adapter instead of an I2C adapter,
full functionality is not available. Only smaller devices are
supported (24c16 and below, max 4 kByte).
This driver can also be built as a module. If so, the module
will be called at24.
config EEPROM_AT25
tristate "SPI EEPROMs (FRAMs) from most vendors"
depends on SPI && SYSFS
select SPI_MEM
help
Enable this driver to get read/write support to most SPI EEPROMs
and Cypress FRAMs,
after you configure the board init code to know about each eeprom
on your target board.
This driver can also be built as a module. If so, the module
will be called at25.
config EEPROM_93XX46
tristate "Microwire EEPROM 93XX46 support"
depends on SPI && SYSFS
select REGMAP
help
Driver for the microwire EEPROM chipsets 93xx46x. The driver
supports both read and write commands and also the command to
erase the whole EEPROM.
This driver can also be built as a module. If so, the module
will be called eeprom_93xx46.
If unsure, say N.
config EEPROM_EE1004
tristate "SPD EEPROMs on DDR4 memory modules"
depends on I2C && SYSFS
help
Enable this driver to get read support to SPD EEPROMs following
the JEDEC EE1004 standard. These are typically found on DDR4
SDRAM memory modules.
This driver can also be built as a module. If so, the module
will be called ee1004.
config EEPROM_M24LR
tristate "STMicroelectronics M24LR RFID/NFC EEPROM support"
depends on I2C && SYSFS
select REGMAP_I2C
help
This enables support for STMicroelectronics M24LR RFID/NFC EEPROM
chips. These dual-interface devices expose two I2C addresses:
one for EEPROM memory access and another for control and system
configuration (e.g. UID, password handling).
This driver provides a sysfs interface for control functions and
integrates with the nvmem subsystem for EEPROM access.
To compile this driver as a module, choose M here: the
module will be called m24lr.
endif # NVMEM_SYSFS
config NVMEM_AIROHA_SMC_EFUSES
tristate "Airoha SMC eFuse support"
depends on ARCH_AIROHA || COMPILE_TEST

5
drivers/nvmem/Makefile
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@@ -10,6 +10,11 @@ nvmem_layouts-y := layouts.o
obj-y += layouts/
# Devices
obj-$(CONFIG_EEPROM_AT24) += at24.o
obj-$(CONFIG_EEPROM_AT25) += at25.o
obj-$(CONFIG_EEPROM_93XX46) += eeprom_93xx46.o
obj-$(CONFIG_EEPROM_EE1004) += ee1004.o
obj-$(CONFIG_EEPROM_M24LR) += m24lr.o
obj-$(CONFIG_NVMEM_AIROHA_SMC_EFUSES) += nvmem-airoha-smc-efuses.o
nvmem-airoha-smc-efuses-y := airoha-smc-efuses.o
obj-$(CONFIG_NVMEM_AN8855_EFUSE) += nvmem-an8855-efuse.o

0
drivers/misc/eeprom/at24.c → drivers/nvmem/at24.c
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0
drivers/misc/eeprom/at25.c → drivers/nvmem/at25.c
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0
drivers/misc/eeprom/ee1004.c → drivers/nvmem/ee1004.c
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0
drivers/misc/eeprom/eeprom_93xx46.c → drivers/nvmem/eeprom_93xx46.c
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0
drivers/misc/eeprom/m24lr.c → drivers/nvmem/m24lr.c
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