serial: 8250_of: Add reset support
This adds the hooks for an optional reset controller in the 8250 device tree node. Signed-off-by: NJoel Stanley <joel@jms.id.au> Reviewed-by: NPhilipp Zabel <p.zabel@pengutronix.de> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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