On Wed, Dec 20, 2017 at 10:26 AM, Bartosz Golaszewski <brgl@xxxxxxxx> wrote: > 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. > Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx> A one totally minor nit: if it possible now to have one line where devm_gpiod_get_optional() is called? You may ignore this nit anyway. > 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 > -- With Best Regards, Andy Shevchenko
