Re: [PATCH v4 3/8] spi: stm32: Add 'SPI_SIMPLEX_RX', 'SPI_3WIRE_RX' support for stm32f4
From: Mark Brown <broonie@kernel.org>
Date: 2020-05-22 16:29:06
Also in:
dri-devel, linux-arm-kernel, linux-clk, linux-spi, lkml
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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