[LinuxPPS] PPS echo implementation

[tom burkart]

Hi all,
attached is the latest patch for the PPS echo implementation  
originally authored by Lukas Senger.

The patch applies cleanly to the current Raspberry Pi kernel  
(4.14.68), but has some extra files (devicetree items) when patched  
against the latest kernel (4.16.7) and an offset in pps-gpio.c as the  
mainline kernel now supports capturing on clear via the devicetree.

Please test and comment.  Ideally, this should be ready for inclusion  
in the mainline kernel.

Kind regards,

Tom Burkart
Consultant

AUSSEC Mob: 04 1768 2202 Fax: 02 9526 1230
30 Waterside Crs, Carramar NSW 2163
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