On Tue, Feb 25, 2020 at 1:43 PM Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> wrote: > > On 2/25/20 7:35 PM, Tim Harvey wrote: > > Some SPI host controllers such as the Cavium Thunder do not support > > full-duplex SPI. Using half-duplex transfers allows the driver to work > > with those host controllers. > > There are several transfers left in the driver, where both rx_buf and > tx_buf are set. How does your host controller driver know which one to > handle? > Marc, Your right... there is the mcp251x_hw_rx_frame() call that also uses spi_rx_buf after a synchronous transfer (I didn't see any others). I'll look at this again. In general is it an ok approach to switch the driver to half-duplex for this issue without the need of complicating things with a module/dt param? Regards, Tim
