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This function is needed in mcp23s08. That driver is a special snowflake because it supports several hardware chips as a single "GPIO chip" under Linux. Signed-off-by: Jan Kundrát <jan.kundrat@cesnet.cz> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Phil Reid <preid@electromag.com.au> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>