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Date: Tue, 30 Jan 2018 19:14:16 +0100
From: Lukas Senger <lukas@fridolin.com>
To: giometti@enneenne.com
Cc: linux-kernel@vger.kernel.org
Subject: pps-gpio falsely reporting echo capability?
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Hi,

I'm trying to use PPS_ECHOASSERT with the GPIO pins on a Raspberry
Pi. /sys/class/pps/pps0/echo reports 1, however looking at pps-gpio.c,
no echo-callback is registered. Am I missing something or should either
sysfs report 0 or pps echo be implemented in the client?

>>From a quick glance at the other clients, the same might be true for
pps-ktimer and pps_parport. They both report PPS_ECHO* in info.mode but
never define info.echo.

Cheers,
Lukas