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? [1] https://elixir.bootlin.com/linux/latest/source/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts#L319 -- Heiko
