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authorHans de Goede <hdegoede@redhat.com>2016-02-23 20:46:26 +0300
committerPhilipp Zabel <p.zabel@pengutronix.de>2016-03-30 16:42:05 +0300
commit0b52297f2288ca239e598afe6c92db83d8d2bfcd (patch)
treeaf0f180666543d4a45bf4c68270edbc3c606a5d9 /sound/soc/codecs/wm8400.h
parentc15ddec2ca06076a11195313aa1fce47d2a28c5d (diff)
downloadlinux-0b52297f2288ca239e598afe6c92db83d8d2bfcd.tar.xz
reset: Add support for shared reset controls
In some SoCs some hw-blocks share a reset control. Add support for this setup by adding new: reset_control_get_shared() devm_reset_control_get_shared() devm_reset_control_get_shared_by_index() methods to get a reset_control. Note that this patch omits adding of_ variants, if these are needed later they can be easily added. This patch also changes the behavior of the existing exclusive reset_control_get() variants, if these are now called more then once for the same reset_control they will return -EBUSY. To catch existing drivers triggering this error (there should not be any) a WARN_ON(1) is added in this path. When a reset_control is shared, the behavior of reset_control_assert / deassert is changed, for shared reset_controls these will work like the clock-enable/disable and regulator-on/off functions. They will keep a deassert_count, and only (re-)assert the reset after reset_control_assert has been called as many times as reset_control_deassert was called. Calling reset_control_assert without first calling reset_control_deassert is not allowed on a shared reset control. Calling reset_control_reset is also not allowed on a shared reset control. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Diffstat (limited to 'sound/soc/codecs/wm8400.h')
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