Hi, On 19/08/2019 13:03:51+0200, Alexander Dahl wrote: > Hei hei, > > just tried to compile this v5.2.9-rt3 for SAMA5D27-SOM1-EK1 based on > arch/arm/configs/sama5_defconfig and with running oldconfig and selecting > defaults, but that fails if CONFIG_ATMEL_TCB_CLKSRC_USE_SLOW_CLOCK is not set. > > I think this is due to changes for Atmel TCLIB in v5.2 and the not yet adapted > RT patch "clocksource: TCLIB: Allow higher clock rates for clock events", > right? Patch clocksource-tclib-allow-higher-clockrates.patch needs to be changed so: ret = setup_clkevents(tc, best_divisor_idx); becomes ret = setup_clkevents(&tc, best_divisor_idx); Also, I would think clocksource-tclib-add-proper-depend.patch could be dropped. Instead, setup_clkevents should use atmel_tcb_divisors. It would then be necessary to move its declaration before the function. Sebastian, can you take care of that or do you expect a patch? In the latter case, do you want a patch for the patch? > > What's the recommended setting of this option for RT? > Using the slow clock, will make the platform wakeup less frequently, having a higher clock rate will give a better clockevent resolution. -- Alexandre Belloni, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
