Hi I'm wondering how commit 60e2809a84 (dm: spi: Avoid setting the speed with every transfer) works. AFAIU, the currently selected speed is a property of the SPI master, so suppose we have two slaves, A which has max_hz = 10MHz and B which has max_hz = 20MHz. Now suppose we do transfers to A, then B, then A again. The third time we still compute speed = 10MHz, but since that matches what we cached in slave->speed, we don't call spi_set_speed_mode(), hence we proceed to do the xfer with a too large speed?
I'm probably missing something obvious here since the commit is more than 4 years old. Thanks, Rasmus