eeprom: make older eeprom drivers select NVMEM_SYSFS

misc/eeprom/{at24,at25,eeprom_93xx46} drivers all register their
corresponding devices in the nvmem framework in compat mode which requires
nvmem sysfs interface to be present. The latter, however, has been split
out from nvmem under a separate Kconfig in commit ae0c2d725512 ("nvmem:
core: add NVMEM_SYSFS Kconfig"). As a result, probing certain I2C-attached
EEPROMs now fails with

  at24: probe of 0-0050 failed with error -38

because of a stub implementation of nvmem_sysfs_setup_compat()
in drivers/nvmem/nvmem.h. Update the nvmem dependency for these drivers
so they could load again:

  at24 0-0050: 32768 byte 24c256 EEPROM, writable, 64 bytes/write

Cc: Adrian Bunk <bunk@kernel.org>
Cc: Bartosz Golaszewski <brgl@bgdev.pl>
Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: stable@vger.kernel.org # v5.2+
Signed-off-by: Arseny Solokha <asolokha@kb.kras.ru>
Link: https://lore.kernel.org/r/20190716111236.27803-1-asolokha@kb.kras.ru
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/misc/eeprom/Kconfig b/drivers/misc/eeprom/Kconfig
index f880947..f2abe27 100644 (file)
--- a/drivers/misc/eeprom/Kconfig
+++ b/drivers/misc/eeprom/Kconfig
@@ -5,6 +5,7 @@ config EEPROM_AT24
        tristate "I2C EEPROMs / RAMs / ROMs from most vendors"
        depends on I2C && SYSFS
        select NVMEM
+       select NVMEM_SYSFS
        select REGMAP_I2C
        help
          Enable this driver to get read/write support to most I2C EEPROMs
@@ -34,6 +35,7 @@ config EEPROM_AT25
        tristate "SPI EEPROMs from most vendors"
        depends on SPI && SYSFS
        select NVMEM
+       select NVMEM_SYSFS
        help
          Enable this driver to get read/write support to most SPI EEPROMs,
          after you configure the board init code to know about each eeprom
@@ -80,6 +82,7 @@ config EEPROM_93XX46
        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