| 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. |
