commit 825b3df6d436da1e4e1b733847f3aa824d07a8a7
author Jan Kundrát <jan.kundrat@cesnet.cz> Tue Jul 17 13:24:40 2018 +0200
committer Jan Kundrát <jan.kundrat@cesnet.cz> Tue Jul 17 13:24:40 2018 +0200
tree d273573088617578dcf1ed841a8eeca608be0ef1
parent 713b2c1c247aca61a08df150ff15653cd01f5091

Prepare for LED triggers in response to line-in loss-of-signal

The EDFA's signal is available on a GPIO, and the `gpio` trigger
supports shared pin access in this context. Here's roughly how to enable
it:

  # cd /sys/class/leds/$SOMETHING
  # echo gpio > trigger
  # echo 490 > gpio
  # echo 1 > inverted

Change-Id: I5bd24af2ea5eff22020dcf87b5ac33e2cc9ae8da

board/czechlight/common/linux.fragment

diff --git a/board/czechlight/common/linux.fragment b/board/czechlight/common/linux.fragment
index c164887..cf6727f 100644
--- a/board/czechlight/common/linux.fragment
+++ b/board/czechlight/common/linux.fragment
@@ -67,6 +67,7 @@
 CONFIG_LED_TRIGGER_PHY=y
 CONFIG_LEDS_TRIGGER_TRANSIENT=y
 CONFIG_LEDS_TRIGGER_NETDEV=y
+CONFIG_LEDS_TRIGGER_GPIO=y
 
 # network functionality for the OSC
 CONFIG_BRIDGE=y