staging: imx-drm-core: use of_graph_parse_endpoint
Using of_graph_parse_endpoint recovers the port id from an endpoint device tree node. This just replaces an open coded read of the "reg" property. Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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