at86rf230: add slp_tr support to start tx
This patch adds support for one of the slp_tr gpio use cases which indicates the TX_START command without doing some spi bus traffic. Signed-off-by: NAlexander Aring <alex.aring@gmail.com> Reviewed-by: NVarka Bhadram <varkabhadram@gmail.com> Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
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