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

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

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.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> ---
>  drivers/gpio/gpio-pca953x.c | 44 +++++++++++++++++++++++++++++++++++++
>  1 file changed, 44 insertions(+)
> 
> diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
> index 1fca8dd7824f..2014563309be 100644
> --- a/drivers/gpio/gpio-pca953x.c
> +++ b/drivers/gpio/gpio-pca953x.c
> @@ -10,6 +10,7 @@
>  
>  #include <linux/acpi.h>
>  #include <linux/bitmap.h>
> +#include <linux/dmi.h>
>  #include <linux/gpio/driver.h>
>  #include <linux/gpio/consumer.h>
>  #include <linux/i2c.h>
> @@ -113,6 +114,39 @@ static const struct acpi_device_id pca953x_acpi_ids[] = {
>  };
>  MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids);
>  
> +#ifdef CONFIG_GPIO_PCA953X_IRQ
> +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.