mfd: Add a prcmu_abb_write_masked routine to db8500-prcmu
This patch adds driver support for the I2C read-modify-write service in the U8500 PRCMU firmware. Signed-off-by: Mattias Nilsson <mattias.i.nilsson@stericsson.com> Reviewed-by: Jonas ABERG <jonas.aberg@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
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