On Tue, Dec 19, 2017 at 6:14 PM, 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. > > Add a new optional property to the device tree binding document, which > allows to specify the GPIO line to which the write-protect pin is > connected. > > + - write-protect-gpios: GPIO to which the write-protect pin of the chip is The rule of thumb is to check what is de facto state of the properties like this, i.e. % git grep -n wp-gpio -- Documentation/ | wc -l 14 % git grep -n write-protect-gpio -- Documentation/ | wc -l 0 I think it means something. -- With Best Regards, Andy Shevchenko
