From 3bf57561d4dbd36ba45ce05656b0469bfdcc7ef2 Mon Sep 17 00:00:00 2001
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Fri, 14 Nov 2014 16:13:50 +1100
Subject: [PATCH] powerpc/powernv: Support OPAL requested heartbeat

If OPAL requests it, call it back via opal_poll_events() at a
regular interval. Some versions of OPAL on some machines require
this to operate some internal timeouts properly.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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