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Add an additional reg_downshift to be applied to register addresses before any register accesses. An example of a device that uses this is a VSC7514 chip, which require each register address to be downshifted by two if the access is performed over a SPI bus. Signed-off-by: Colin Foster <colin.foster@in-advantage.com> Link: https://lore.kernel.org/r/20220313224524.399947-2-colin.foster@in-advantage.com Signed-off-by: Mark Brown <broonie@kernel.org>