On Sat, Sep 25, 2021 at 02:19:58PM +0200, Pali Rohár wrote:
Add new functions which returns the nearest baudrate and use them instead of hardcoded and incomplete CONFIG_SYS_BAUDRATE_TABLE compile time option.
Add implementation of rounding function for serial_mvebu_a3700 driver and also for A3720 Espressobin board which has integrated pl2303 USB<->UART converter, which basically limits baudrates which can user set.
Completely remove CONFIG_SYS_BAUDRATE_TABLE defines from all A3720 boards as now with rounding functions it is not used anymore.
NOTE: This is just an example how to kill CONFIG_SYS_BAUDRATE_TABLE compile time definitions. I tested it that it works on A3720 Turris Mox board. I have not tested A3720 Espressobin board yet.
More discussion on this approach is required, so take this just as RFC change.
Signed-off-by: Pali Rohár pali@kernel.org
Thanks for doing this. My first question is, is this really per-board? Or per SoC / UART chipset. I would hope for example that for plain old ns16550s this would be a generic function, perhaps with an optional board call-out for board design limitations. This does feel like a reasonable amount of code for platforms like this that were supporting what was the maximal rate table before.