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>

diff --git a/Documentation/ABI/stable/sysfs-bus-nvmem b/Documentation/ABI/stable/sysfs-bus-nvmem
index 854bd11d72ac45657dc5c7a078e50f955ad10dd4..3f0a95250aa84fa8cd8912510f8a0f57c4af7514 100644 (file)
--- a/Documentation/ABI/stable/sysfs-bus-nvmem
+++ b/Documentation/ABI/stable/sysfs-bus-nvmem
@@ -20,3 +20,14 @@ Description:
                  ...
                  *
                  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.