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Simplify probe and cleanup code by using devm_ioremap_resource. This also
makes probe code to follow more common allocate private struct followed by
other initialization style.
Signed-off-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Chris Ball <chris@printf.net>