| What: /sys/bus/nvmem/devices/.../force_ro | |
| Date: June 2024 | |
| KernelVersion: 6.11 | |
| Contact: Marek Vasut <marex@denx.de> | |
| Description: | |
| This read/write attribute allows users to set read-write | |
| devices as read-only and back to read-write from userspace. | |
| This can be used to unlock and relock write-protection of | |
| devices which are generally locked, except during sporadic | |
| programming operation. | |
| Read returns '0' or '1' for read-write or read-only modes | |
| respectively. | |
| Write parses one of 'YyTt1NnFf0', or [oO][NnFf] for "on" | |
| and "off", i.e. what kstrtobool() supports. | |
| Note: This file is only present if CONFIG_NVMEM_SYSFS | |
| is enabled. | |
| What: /sys/bus/nvmem/devices/.../nvmem | |
| Date: July 2015 | |
| KernelVersion: 4.2 | |
| Contact: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> | |
| Description: | |
| This file allows user to read/write the raw NVMEM contents. | |
| Permissions for write to this file depends on the nvmem | |
| provider configuration. | |
| Note: This file is only present if CONFIG_NVMEM_SYSFS | |
| is enabled | |
| ex:: | |
| hexdump /sys/bus/nvmem/devices/qfprom0/nvmem | |
| 0000000 0000 0000 0000 0000 0000 0000 0000 0000 | |
| * | |
| 00000a0 db10 2240 0000 e000 0c00 0c00 0000 0c00 | |
| 0000000 0000 0000 0000 0000 0000 0000 0000 0000 | |
| ... | |
| * | |
| 0001000 | |
| What: /sys/bus/nvmem/devices/.../type | |
| Date: November 2018 | |
| KernelVersion: 5.0 | |
| Contact: Alexandre Belloni <alexandre.belloni@bootlin.com> | |
| Description: | |
| This read-only attribute allows user to read the NVMEM | |
| device type. Supported types are "Unknown", "EEPROM", | |
| "OTP", "Battery backed", "FRAM". | |
| Note: This file is only present if CONFIG_NVMEM_SYSFS | |
| is enabled. |