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由 Jamie Iles 提交于
Most controllers require the direction of a GPIO to be set by writing to a direction register. Add support for either an input direction register or an output direction register. Signed-off-by: NJamie Iles <jamie@jamieiles.com> Acked-by: NAnton Vorontsov <cbouatmailru@gmail.com> Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
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