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Add a function to get regulators, supplying card's Vdd and Vccq on a specific host. If a Vdd supplying regulator is found, the function checks, whether a valid OCR mask can be obtained from it. The Vccq regulator is optional. A failure to get it is not fatal. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Reviwed-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Chris Ball <cjb@laptop.org>