[nrf fromtree] samples: drivers: Add spis_wakeup sample #2692
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Sample showing how to use the additional wakeup signal in nordic,nrf-spis driver. The application, configured as a SPIS, is put to sleep while waiting for an SPI transmission. An external device working as a SPIM and also handling the wakeup signal wakes the application up just before the transmission starts.
(cherry picked from commit 41a99)