On Wed, Feb 13, 2013 at 12:13 PM, Lars Poeschel <poesc...@lemonage.de> wrote: > On Monday 11 February 2013 at 22:25:51, Grant Likely wrote: >> >> However, is the pullup selection per-gpio line? If so, then why not >> encode it into the flags field of the gpio specifier? > > Yes, the pullup is per-gpio line. I am working on that. It turns out, that > this is a bit difficult for me, as there is no real documentation and no > other driver is doing it or something similar yet. Exception are very few > gpio soc drivers where situation is a bit different. They seem to rely an > fixed global gpio numbers and they are always memory mapped. > But as I said I am working on it...
Part of your problem is that pull-up is pin control territory. We invented that subsystem for a reason, and that reason was that the GPIO subsystem had a hard time accomodating things like this. If you look in drivers/pinctrl/pinctrl-abx500.c which is my latest submitted pinctrl driver you can see that this is basically a quite simple GPIO chip, we just model it as a pin controller with a GPIO front-end too exactly because it can do things like multiplexing, pull-up and pull-down. Have you considered this approach? Yours, Linus Walleij ------------------------------------------------------------------------------ Free Next-Gen Firewall Hardware Offer Buy your Sophos next-gen firewall before the end March 2013 and get the hardware for free! Learn more. http://p.sf.net/sfu/sophos-d2d-feb _______________________________________________ spi-devel-general mailing list spi-devel-general@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/spi-devel-general
