Re: [PATCH v13] i2c: designware: defer probe if child GpioInt controllers are not bound

Hi Wolfram, Andi,

This has Reviewed-by from Andy and Acked-by from Bart. Could this be
queued for the next merge window?

Thanks,
Hardik

On Mon, 20 Jul 2026 at 13:37, Bartosz Golaszewski <[email protected]> wrote:
>
> On Sat, 18 Jul 2026 07:43:31 +0200, Hardik Prakash
> <[email protected]> said:
> > I2C controllers may have child devices with GpioInt resources that
> > depend on GPIO controllers being fully initialized. If the I2C
> > controller probes and enumerates children before the referenced GPIO
> > controller has completed probe, GPIO interrupts may not be properly
> > configured, leading to device failures.
> >
> > On Lenovo Yoga 7 14AGP11, the WACF2200 touchscreen (child of
> > AMDI0010:02) has a GpioInt resource pointing to GPIO 157 on the
> > pinctrl-amd controller (AMDI0030:00). When i2c-designware probes
> > AMDI0010:02 before pinctrl-amd finishes initializing, I2C transactions
> > fail with lost arbitration errors:
> >
> >   0.285952  amd_gpio_probe: registering gpiochip  <- GPIO chip visible
> >   0.287121  amd_gpio_probe: requesting parent IRQ <- probe still running
> >   0.301454  AMDI0010:02 dw_i2c_plat_probe: start  <- races here
> >   2.348157  lost arbitration
> >
> > Add a dependency check that walks ACPI child devices and defers probe
> > until any referenced GPIO controller is bound.
> >
> > Fixes: 3812a9e84265 ("pinctrl-amd: enable IRQ for WACF2200 touchscreen on Lenovo Yoga 7 14AGP11")
> > Suggested-by: Mario Limonciello <[email protected]>
> > Suggested-by: Andy Shevchenko <[email protected]>
> > Signed-off-by: Hardik Prakash <[email protected]>
> > Assisted-by: Claude:claude-sonnet-5
> > Assisted-by: DeepSeek:deepseek-v4-pro
> > Link: https://bugzilla.kernel.org/show_bug.cgi?id=221494
> > ---
>
> Acked-by: Bartosz Golaszewski <[email protected]>