Re: Re: [PATCH v6 08/13] gpio: regmap: support write_data_after_dir and girq

[Andy Shevchenko]

On Mon, Sep 07, 2026 at 12:20:03PM +0800, zl020895 wrote:

> > Are you going to fix this HW in the next version of the SoC?
> No — Ambarella does not use write_data_after_dir. It only preserves the
> existing ARM PL061 quirk already documented in gpio-pl061 (data writes
> ignored while the pin is still an input). Only pl061_arm sets the flag.

Ah, this is a good news!

In any case when documenting that flag, please also mention that any new HW
should not use it as it's considered buggy (glitches during direction change
are guaranteed).

> I will also make the first gpio_regmap_set() conditional so the quirk
> path writes once after direction_output, not twice.

I see that original pl061 actually writes twice. TBH I don't know the best
effort here and if it's really required to do so. Probably others have
better ideas...

> > This needs to be in a separate update. Also we need to understand why
> > it is required.
> OK, girq will be a separate patch. PL061 keeps a custom chained
> irqchip (not regmap-irq); gpio_regmap today only takes irq_domain or
> regmap_irq_chip, so we passed girq to keep the usual gpio_irq_chip +
> gpiochip_add flow. Open to using a caller-created irq_domain instead if
> you prefer.

If there is a chained IRQ, look how PMIC drivers usually do similar setups.
First what comes to my mind is drivers/mfd/intel_soc_pmic_bxtwc.c.

-- 
With Best Regards,
Andy Shevchenko