> Also, if it's only optional for Exynos850 (and not optional for other > chips), maybe it would be a good idea to use *_optional_* API only for > Exynos850 case, so that the driver's behavior for those chips stays > unchanged. Probably should just set the clock to NULL in case of 850 then? > Btw, from the downstream kernel code [1] I can see that the only TMU > clock present in Exynos850 is > GOUT_BLK_PERI_UID_BUSIF_TMU_IPCLKPORT_PCLK (which I was able to > confirm in TRM). But it's not enabled in clk-exynos850.c driver right > now. Do you want me by chance to send the patch adding it? Would be very grateful :) If nothing else, it would be useful for testing.