Commits on Feb 24, 2018

1. firmware/raspberrypi: Add a get_throttled sysfs file …

   Under-voltage due to inadequate power supplies is a recurring problem for
   new Raspberry Pi users. There are visual indications that an
   under-voltage situation is occuring like blinking power led and a
   lightning icon on the desktop (not shown when using the vc4 driver), but
   for new users it's not obvious that this signifies a critical situation.
   
   This patch provides a twofold improvement to the situation:
   
   Firstly it logs under-voltage events to the kernel log. This provides
   information also for headless installations.
   
   Secondly it provides a sysfs file to read the value. This improves on
   'vcgencmd' by providing change notification. Userspace can poll on the
   file and be notified of changes to the value.
   A script can poll the file and use dbus notification to put a windows on
   the desktop with information about the severity with a recommendation to
   change the power supply. A link to more information can also be provided.
   Only changes to the sticky bits are reported (cleared between readings).
   
   Signed-off-by: Noralf Trønnes <noralf@tronnes.org>

   

   notro committed Feb 24, 2018
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