Re: [PATCH v1 5/5] gpio: pca953x: Override GpioInt() pin for Intel Galileo Gen 2

[Mika Westerberg <mika.westerberg@linux.intel.com>]

On Mon, May 25, 2020 at 12:31:50PM +0300, Andy Shevchenko wrote:
> On Mon, May 25, 2020 at 12:20:28PM +0300, Mika Westerberg wrote:
> > On Thu, May 21, 2020 at 12:19:16AM +0300, Andy Shevchenko wrote:
> > > ACPI table on Intel Galileo Gen 2 has wrong pin number for IRQ resource
> > > of one of the I²C GPIO expanders. ACPI GPIO library provides a special
> > > quirk which we may use in this case. With help of it, override GpioInt()
> > > pin for the affected platform.
> 
> ...
> 
> > > +static const struct acpi_gpio_params pca953x_interrupt_gpios = { 0, 0, true };
> > > +
> > > +static const struct acpi_gpio_mapping pca953x_acpi_interrupt_gpios[] = {
> > > +	{ "interrupt-gpios", &pca953x_interrupt_gpios, 1, ACPI_GPIO_QUIRK_FORCE_PIN, 1 },
> > > +	{ }
> > > +};
> > > +
> > > +static int pca953x_acpi_interrupt_get_irq(struct device *dev)
> > > +{
> > > +	struct gpio_desc *desc;
> > > +
> > > +	if (devm_acpi_dev_add_driver_gpios(dev, pca953x_acpi_interrupt_gpios))
> > > +		dev_warn(dev, "can't add GPIO ACPI mapping\n");
> > > +
> > > +	desc = devm_gpiod_get(dev, "interrupt", GPIOD_IN);
> > > +	if (IS_ERR(desc))
> > > +		return PTR_ERR(desc);
> > > +
> > > +	return gpiod_to_irq(desc);
> > > +}
> > > +
> > > +static const struct dmi_system_id pca953x_dmi_acpi_interrupt_info[] = {
> > > +	{
> > > +		.ident = "Intel Galileo Gen 2",
> > > +		.matches = {
> > > +			DMI_EXACT_MATCH(DMI_BOARD_NAME, "GalileoGen2"),
> > > +		},
> > > +	},
> > > +	{}
> > 
> > Since you do everything already in this driver, I think we can live
> > without adding ACPI_GPIO_QUIRK_FORCE_PIN to the core code at all.
> 
> Hmm... I don't see how (perhaps need morning coffee). Any pointers?

Well you already know all the details in this driver, no? Why you need
to pass any of this information to the core and the back to the same
driver?