From owner-freebsd-arm@freebsd.org  Wed Jul 12 03:11:49 2017
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Message-ID: <1499829099.45330.36.camel@freebsd.org>
Subject: i2c realtime clocks now work
From: Ian Lepore <ian@freebsd.org>
To: "freebsd-arm@FreeBSD.org" <freebsd-arm@FreeBSD.org>
Date: Tue, 11 Jul 2017 21:11:39 -0600
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In the past it wasn't possible to use i2c rtc chips/modules on some arm
boards because the i2c driver would trigger a witness assertion about
sleeping while holding locks.  The only option was to use sysctl to set
machdep.disable_rtc_set=1 if your board had an i2c clock.

As of r320902 that restriction is removed and i2c clocks should work on
all systems.

-- Ian