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nvmem: Document type attribute

Document a type attribute used by userspace to discern different types of
NVMEM devices. The implementation is already present, the ABI document is
missing, add it.

Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20240705074852.423202-14-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

authored by

Marek Vasut and committed by
Greg Kroah-Hartman a5f65c77 ac871d6b

+11
+11
Documentation/ABI/stable/sysfs-bus-nvmem
··· 20 20 ... 21 21 * 22 22 0001000 23 + 24 + What: /sys/bus/nvmem/devices/.../type 25 + Date: November 2018 26 + KernelVersion: 5.0 27 + Contact: Alexandre Belloni <alexandre.belloni@bootlin.com> 28 + Description: 29 + This read-only attribute allows user to read the NVMEM 30 + device type. Supported types are "Unknown", "EEPROM", 31 + "OTP", "Battery backed", "FRAM". 32 + Note: This file is only present if CONFIG_NVMEM_SYSFS 33 + is enabled.