Documentation/ABI/stable/sysfs-bus-nvmem

   1 What:           /sys/bus/nvmem/devices/.../force_ro
   2 Date:           June 2024
   3 KernelVersion:  6.11
   4 Contact:        Marek Vasut <marex@denx.de>
   5 Description:
   6                 This read/write attribute allows users to set read-write
   7                 devices as read-only and back to read-write from userspace.
   8                 This can be used to unlock and relock write-protection of
   9                 devices which are generally locked, except during sporadic
  10                 programming operation.
  11                 Read returns '0' or '1' for read-write or read-only modes
  12                 respectively.
  13                 Write parses one of 'YyTt1NnFf0', or [oO][NnFf] for "on"
  14                 and "off", i.e. what kstrtobool() supports.
  15                 Note: This file is only present if CONFIG_NVMEM_SYSFS
  16                 is enabled.
  17
  18 What:           /sys/bus/nvmem/devices/.../nvmem
  19 Date:           July 2015
  20 KernelVersion:  4.2
  21 Contact:        Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
  22 Description:
  23                 This file allows user to read/write the raw NVMEM contents.
  24                 Permissions for write to this file depends on the nvmem
  25                 provider configuration.
  26                 Note: This file is only present if CONFIG_NVMEM_SYSFS
  27                 is enabled
  28
  29                 ex::
  30
  31                   hexdump /sys/bus/nvmem/devices/qfprom0/nvmem
  32
  33                   0000000 0000 0000 0000 0000 0000 0000 0000 0000
  34                   *
  35                   00000a0 db10 2240 0000 e000 0c00 0c00 0000 0c00
  36                   0000000 0000 0000 0000 0000 0000 0000 0000 0000
  37                   ...
  38                   *
  39                   0001000
  40
  41 What:           /sys/bus/nvmem/devices/.../type
  42 Date:           November 2018
  43 KernelVersion:  5.0
  44 Contact:        Alexandre Belloni <alexandre.belloni@bootlin.com>
  45 Description:
  46                 This read-only attribute allows user to read the NVMEM
  47                 device type. Supported types are "Unknown", "EEPROM",
  48                 "OTP", "Battery backed", "FRAM".
  49                 Note: This file is only present if CONFIG_NVMEM_SYSFS
  50                 is enabled.