gpio: gpio-generic: add flag to read out output value from reg_set
The change introduces BGPIOF_READ_OUTPUT_REG_SET flag for gpio-generic GPIO chip implementation, which allows to get correct configured value from reg_set register, input value is still get from reg_dat. Signed-off-by: NVladimir Zapolskiy <vladimir_zapolskiy@mentor.com> Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
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