serial: ns16550: Add reset ctrl to driver
Add code to reset all reset signals as in serial DT node. A reset property is an optional feature, so do not fail if a reset property is not present. If a reset property is discovered, then use it to deassert, thus bringing the IP out of reset. Signed-off-by: NLey Foon Tan <ley.foon.tan@intel.com> Reviewed-by: NMarek Vasut <marex@denx.de> Reviewed-by: NSimon Glass <sjg@chromium.org>
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