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Diffstat (limited to 'Documentation/ABI/stable/sysfs-bus-nvmem')
| -rw-r--r-- | Documentation/ABI/stable/sysfs-bus-nvmem | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/Documentation/ABI/stable/sysfs-bus-nvmem b/Documentation/ABI/stable/sysfs-bus-nvmem new file mode 100644 index 000000000000..0ae8cb074acf --- /dev/null +++ b/Documentation/ABI/stable/sysfs-bus-nvmem @@ -0,0 +1,50 @@ +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. |