gpio: mxc: read output value from GPIO_DR register
All supported iMX GPIO controllers store configured GPIO output value in GPIO_DR data register, which is represented by GPIO generic reg_set. Provide a BGPIOF_READ_OUTPUT_REG_SET flag to bgpio_init() to allow correct getting of previously set output value. Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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