On Fri, 15 Nov 2024 14:18:41 -0600 David Lechner <dlechner@xxxxxxxxxxxx> wrote: > Extend SPI offloading to support hardware triggers. > > This allows an arbitrary hardware trigger to be used to start a SPI > transfer that was previously set up with spi_optimize_message(). > > A new struct spi_offload_trigger is introduced that can be used to > configure any type of trigger. It has a type discriminator and a union > to allow it to be extended in the future. Two trigger types are defined > to start with. One is a trigger that indicates that the SPI peripheral > is ready to read or write data. The other is a periodic trigger to > repeat a SPI message at a fixed rate. > > There is also a spi_offload_hw_trigger_validate() function that works > similar to clk_round_rate(). It basically asks the question of if we > enabled the hardware trigger what would the actual parameters be. This > can be used to test if the requested trigger type is actually supported > by the hardware and for periodic triggers, it can be used to find the > actual rate that the hardware is capable of. > > Signed-off-by: David Lechner <dlechner@xxxxxxxxxxxx> LGTM Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
