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Some devices require a regulator to work, but boards may not have a software controllable regulator for this device. Provide a helper function to make it simpler for these boards to register a fixed regulator as a dummy regulator. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>