wanlei ee6d3de128 spi_slave: add a flag SPI_SLAVE_NO_RETURN_RESULT to bypass return descriptor from ISR ...

if using this flag, driver willn't return the trans-done descriptor from ISR, so
`spi_slave_get_trans_result()` shouldn't be called.
besides, callback is the only way to know transaction status in that case, so a
`post_trans_cb` will be checked mandatory.

2022-09-21 11:56:27 +08:00

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