AT24 EEPROMs have a write-protect pin, which - when pulled high - inhibits writes to the upper quadrant of memory (although it has been observed that on some chips it disables writing to the entire memory range). On some boards, this pin is connected to a GPIO and pulled high by default, which forces the user to manually change its state before writing. On linux this means that we either need to hog the line all the time, or set the GPIO value before writing from outside of the at24 driver. This series adds support for the write-protect pin split into two parts. The first patch extends the relevant binding document, while the second modifies the at24 code to pull the write-protect GPIO low (if present) during write operations. v1 -> v2: - renamed the DT property to wp-gpios Bartosz Golaszewski (2): dt-bindings: at24: new optional property - wp-gpios eeprom: at24: add support for the write-protect pin Documentation/devicetree/bindings/eeprom/at24.txt | 3 +++ drivers/misc/eeprom/at24.c | 11 +++++++++++ 2 files changed, 14 insertions(+) -- 2.15.1
