PPS input on GPIO pin RPI2.

[Ian Lepore]

On Thu, 2016-03-31 at 11:29 +0200, Peter Ankerstål wrote:
> (Sorry for sort of double posting)
> 
> Hi!
> 
> I asked a question on the stable@ list a few weeks ago about having
> PPS 
> input on a generic GPIO-pin on the RPI2. I received some positive 
> feedback that this should be easy to implement but have heard nothing
> since. Today I found out about the arm-list and thought this maybe
> was a 
> better place for this question.
> 
> 
> Background:
> https://lists.freebsd.org/pipermail/freebsd-stable/2016-March/084288.
> html
> 
> Similar question:
> https://lists.freebsd.org/pipermail/freebsd-questions/2014-July/25905
> 5.html
> 
> /Peter.
> 

Sorry for the slow response on this, just wanted to let you know that
work on this is finally underway.  The big interrupt infrastructure
changes I was waiting for were committed a few days ago.  I started
writing the pps driver and ran into some more "we have no way to do
this" problems which we're building even more new infrastructure for
now. :)

I have no firm ETA, but I did get enough of a proof-of-concept hacked
together yesterday that I was able to get pps input working on a gpio
pin on a wandboard (and that work will generalize to any of the arm
boards that use FDT data pretty quickly), so it shouldn't be much
longer.

-- Ian