gpiolib: acpi: Add ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER quirk

On some systems the ACPI tables has wrong pin number and instead of
having a relative one it provides an absolute one in the global GPIO
number space.

Add ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER quirk to cope with such cases.

Fixes: ba8c90c61847 ("gpio: pca953x: Override IRQ for one of the expanders on Galileo Gen 2")
Depends-on: 0ea683931adb ("gpio: dwapb: Convert driver to using the GPIO-lib-based IRQ-chip")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 86efa2d..0fa0127 100644 (file)
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -677,6 +677,7 @@ static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
        if (!lookup->desc) {
                const struct acpi_resource_gpio *agpio = &ares->data.gpio;
                bool gpioint = agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
+               struct gpio_desc *desc;
                u16 pin_index;
 
                if (lookup->info.quirks & ACPI_GPIO_QUIRK_ONLY_GPIOIO && gpioint)
@@ -689,8 +690,12 @@ static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
                if (pin_index >= agpio->pin_table_length)
                        return 1;
 
-               lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
+               if (lookup->info.quirks & ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER)
+                       desc = gpio_to_desc(agpio->pin_table[pin_index]);
+               else
+                       desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
                                              agpio->pin_table[pin_index]);
+               lookup->desc = desc;
                lookup->info.pin_config = agpio->pin_config;
                lookup->info.debounce = agpio->debounce_timeout;
                lookup->info.gpioint = gpioint;

diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index ef49307..c73b25b 100644 (file)
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -674,6 +674,8 @@ struct acpi_gpio_mapping {
  * get GpioIo type explicitly, this quirk may be used.
  */
 #define ACPI_GPIO_QUIRK_ONLY_GPIOIO            BIT(1)
+/* Use given pin as an absolute GPIO number in the system */
+#define ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER                BIT(2)
 
        unsigned int quirks;
 };