This change adds the device tree property for specifying oe-override
(output-enable override behavior), as well as defines for possible values
of the property.
RP2040 GPIOs can be configured to automatically invert the output-enable
signal from the selected peripheral function. This is useful for tasks like
writing efficient PIO code, such as in the i2c example in the rp2040
datasheet.
Signed-off-by: Yiding Jia <yiding.jia@gmail.com>
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