Am 17. September 2021 09:28:51 MESZ schrieb Heiko Thiery <heiko.thiery@xxxxxxxxx>: >Hi Frieder, > >Am Mi., 15. Sept. 2021 um 14:09 Uhr schrieb Frieder Schrempf ><frieder.schrempf@xxxxxxxxxx>: >> >> On 15.09.21 14:05, Michael Walle wrote: >> > Am 2021-09-15 14:03, schrieb Heiko Thiery: >> >> The buck2 output of the PMIC is the VDD core voltage of the cpu. >> >> Switching off this will poweroff the CPU. Add the 'regulator-always-on' >> >> property to avoid this. >> > >> > Mh, have this ever worked? Is there a commit which introduced a regression? >> >> Yes, this did work before, even without 'regulator-always-on'. I >> currently don't understand why this is needed. The regulator is >> referenced in the CPU nodes as 'cpu-supply'. This should be enough to >> not disable it as long as the CPU is up. > >I rechecked that with 5.11, 5.10 and 5.9 and I see on all of them the >same issue: > >[ 31.716031] vdd-5v: disabling >[ 31.719032] rst-usb-eth2: disabling >[ 31.722553] buck2: disabling > >While on that I tried to compare with other boards and see that they >also have the cpu-voltage marked as "regulator-always-on". The only >exception in dts/freescale is in imx8mq-librem5-devkit.dts [1] that >has not set this property. > >I agree with you and don't understand why this is happening. Has >anyone else an explanation? Do you have the CPU frequency scaling driver enabled? -michael
