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1What: /sys/bus/nvmem/devices/.../force_ro2Date: June 20243KernelVersion: 6.114Contact: Marek Vasut <marex@denx.de>5Description:6 This read/write attribute allows users to set read-write7 devices as read-only and back to read-write from userspace.8 This can be used to unlock and relock write-protection of9 devices which are generally locked, except during sporadic10 programming operation.11 Read returns '0' or '1' for read-write or read-only modes12 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_SYSFS16 is enabled.17 18What: /sys/bus/nvmem/devices/.../nvmem19Date: July 201520KernelVersion: 4.221Contact: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>22Description:23 This file allows user to read/write the raw NVMEM contents.24 Permissions for write to this file depends on the nvmem25 provider configuration.26 Note: This file is only present if CONFIG_NVMEM_SYSFS27 is enabled28 29 ex::30 31 hexdump /sys/bus/nvmem/devices/qfprom0/nvmem32 33 0000000 0000 0000 0000 0000 0000 0000 0000 000034 *35 00000a0 db10 2240 0000 e000 0c00 0c00 0000 0c0036 0000000 0000 0000 0000 0000 0000 0000 0000 000037 ...38 *39 000100040 41What: /sys/bus/nvmem/devices/.../type42Date: November 201843KernelVersion: 5.044Contact: Alexandre Belloni <alexandre.belloni@bootlin.com>45Description:46 This read-only attribute allows user to read the NVMEM47 device type. Supported types are "Unknown", "EEPROM",48 "OTP", "Battery backed", "FRAM".49 Note: This file is only present if CONFIG_NVMEM_SYSFS50 is enabled.51