tree 12cd41d58ed7e3e48389b4cc2a11e8a8686cd36a
parent cdd24f76fe84fd6ee3b46f54b2a475d04d79889d
author Martin Blumenstingl <martin.blumenstingl@googlemail.com> 1478956383 +0100
committer Philipp Zabel <p.zabel@pengutronix.de> 1479113908 +0100

reset: allow using reset_control_reset with shared reset

Some SoCs (for example Amlogic GXBB) implement a reset controller which
only supports a reset pulse (triggered via reset_control_reset). At the
same time multiple devices (in case of the Amlogic GXBB SoC both USB
PHYs) are sharing the same reset line.

This patch allows using reset_control_reset also for shared resets.
There are limitations though:
reset_control_reset can only be used if reset_control_assert was not
used yet.
reset_control_assert can only be used if reset_control_reset was not
used yet.
For shared resets the reset is only triggered once for the lifetime of
the reset_control instance (the reset can be triggered again if all
consumers of that specific reset_control are gone, as the reset
framework will free the reset_control instance in that case).

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>