gpio-rcar: Add DT support
Add DT bindings for the gpio-rcar driver and read the device configuration from the DT node at probe time if available. Cc: devicetree-discuss@lists.ozlabs.org Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>
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