On Monday 24 October 2016 02:53:31, Linus Walleij wrote: > On Fri, Oct 21, 2016 at 5:00 PM, Enric Balletbo i Serra > > <enric.balle...@collabora.com> wrote: > > Default is without pullups, but if property is specified in DT and the bit > > is set, set a pullup on GPIO-n. > > > > Signed-off-by: Enric Balletbo i Serra <enric.balle...@collabora.com> > > I don't generally like this. > > In device tree it is the consumer that specifies how the line is used, > not the producer (gpiochip). > > We currently only specify polarity, open drain and open source > for consumers though. > > And the entire pin control system came into being *exactly* because > Grant didn't like me adding these things to the GPIO drivers. > > So how many other things does the MCP support? Drive strength? > Schmitt trigger? Is there a datasheet?
Some unsupported features (AFAIK): * Input polarity (IPOL register) * open-drain interrupt pin * pullup on pins (proposed patch) Datasheet is here: http://ww1.microchip.com/downloads/en/DeviceDoc/21919e.pdf Best regards, Alexander
