From: Scott Main <smain@google.com>
Date: Fri, 4 Dec 2020 20:09:22 +0000 (-0800)
Subject: Add timout loop after exporting the PWM pin.
X-Git-Tag: 5.8.1^2~1
X-Git-Url: https://git.ayoreis.com/Adafruit_Blinka-hackapet.git/commitdiff_plain/021b4e28a42bb5693ab6048c417fb906874d4eb1?ds=sidebyside;hp=021b4e28a42bb5693ab6048c417fb906874d4eb1

Add timout loop after exporting the PWM pin.

This gives udev time to respond to the device event. Without this,
the subsequent attempts to modify pin properties will fail when
depending on udev rules to apply new user permissions.

This code is essentially copied from python-periphery, as was most
of this file (both MIT licenced). Although it appears sergeev added
this loop recently, compared to when this code was originally cloned.
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