[PATCH 1/4] power: regulator: Trigger probe of regulators which are always-on or boot-on

[Svyatoslav Ryhel]

ср, 11 вер. 2024 р. о 14:01 Marek Vasut <marex at denx.de> пише:
>
> On 9/11/24 7:57 AM, Svyatoslav Ryhel wrote:
>
> [...]
>
> >>>> You did mention something regarding I2C/PMIC driver probe timing, but it
> >>>> seems the I2C driver and PMIC drivers probe roughly around the same time
> >>>> in both pass and fail cases ?
> >>>
> >>> Yes, here I agree that they both probe and probe passes, but I assume
> >>> timing of i2c call is critical and there may be some dependency which
> >>> is not ready.
> >>
> >> My guess would be pinmux or clock, maybe the i2c controller is marked as
> >> bootph-* in DT and its pinmux/clock is not? Maybe the i2c on tegra works
> >> by sheer coincidence right now? Can you have a look?
> >
> > Power i2c line (one that hosts PMIC) is configured extremely early in
> > SPL since it is needed for cpu and core voltage setup so even if, as
> > you say, tegra works by sheer coincidence, specifically this i2c line
> > should work non the less, since it has all its pre-requisites (clock
> > and pinmux) configured on early stage.
>
> Is it possible that this configuration is somehow reset or reconfigured
> from DT early on in U-Boot proper ?

No

> Do you have serial console output in board_f.c time in U-Boot proper ,
> possibly using DEUBG_UART , to check if there might be some prior
> failing I2C transfer at that board_f.c time ?

Haven't spotted anything weird there.

> > As I have told, I was not able to determine exact reason why this
> > happens, it should not and yet it does. This is why I have abandoned
> > my attempt to implement same changes you are currently proposing.
>
> If tegra has a problem, it should be fixed on tegra side and not block
> core plumbing. I am not seeing the problem on stm32 or imx systems, so I
> am banking toward tegra-specific issue.
>

And yet you are pushing tegra breaking stuff. I will insist on
reverting this is it passes.

> Are you able to debug this ?

No, I am not able find exact cuse of this behavior.