On Fri, May 22, 2020 at 11:59:25PM +0800, dillon min wrote: > but, after spi-core create a dummy tx_buf or rx_buf, then i can't get > the correct spi_3wire direction. > actually, this dummy tx_buf is useless for SPI_3WIRE. it's has meaning > for SPI_SIMPLE_RX mode, > simulate SPI_FULL_DUMPLEX
Oh, that's annoying. I think the fix here is in the core, it should ignore MUST_TX and MUST_RX in 3WIRE mode since they clearly make no sense there.
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