[LinuxPPS] linuxpps and devicetree support

[Jan Lübbe]

On Fri, 2013-04-26 at 08:12 -0400, tlhackque wrote:
> capture {clear,assert} tells PPS software which edge(s) to record and
> deliver to userspace.

This seems to be a configuration setting and as such should not go into
the DT.

> assert {rising,falling} edge tells GPIO which edge(s) it should
> program to interrupt, and which logic level is the asserted (true,
> '1') state.  
> PPS only cares about edges, so hardware level-sensitive lines are
> turned into edges by the driver stack.

So we would only have a flag "assert-falling-edge" which switches from
the default assert-rising-edge to assert-falling-edge. Based on this
flag, the driver should be able to figure out the necessary interrupt
configuration by itself.

Regards,
Jan