[U-Boot] [PATCH 1/2] ARM: dts: imx6q-logicpd: Keep GEN3V3 alive

[Adam Ford]

On Tue, Oct 8, 2019 at 1:40 PM Fabio Estevam <festevam at gmail.com> wrote:
>
> Hi Adam,
>
> On Tue, Oct 8, 2019 at 3:32 PM Adam Ford <aford173 at gmail.com> wrote:
> >
> > The schematic shows Gen3V3 is driven by sw2_reg on the pfuze100
> > PMIC.  Linux doesn't appear to have an issue keeping this rail
> > up, but U-Boot shuts it down for some reason.
> >
> > This patch sets 'regulator-always-on' for sw2_reg to keept this
> > rail powered.
>
> Why does U-Boot shuts down sw2_reg?

I don't know.

>
> sw2_reg has a consumer: &usdhc1, so it should keep turned on.
>
I would agree.

> Or you don't use usdhc1 port in U-Boot?

I do use usdhc1 powered from that rail, but if I enable I2C, the MMC
initialization dies and the board hangs. It seems like a bug to me,
but I'll look into that later.  At least for now, I can use this as a
work-around for keeping the board alive.

adam
>
> Just want to understand this problem better.