diff options
Diffstat (limited to 'drivers/gpio/gpiolib-acpi.c')
| -rw-r--r-- | drivers/gpio/gpiolib-acpi.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c index 7f140df40..c1e190d3e 100644 --- a/drivers/gpio/gpiolib-acpi.c +++ b/drivers/gpio/gpiolib-acpi.c @@ -128,7 +128,24 @@ static bool acpi_gpio_deferred_req_irqs_done; static int acpi_gpiochip_find(struct gpio_chip *gc, const void *data) { - return device_match_acpi_handle(&gc->gpiodev->dev, data); + /* First check the actual GPIO device */ + if (device_match_acpi_handle(&gc->gpiodev->dev, data)) + return true; + + /* + * When the ACPI device is artificially split to the banks of GPIOs, + * where each of them is represented by a separate GPIO device, + * the firmware node of the physical device may not be shared among + * the banks as they may require different values for the same property, + * e.g., number of GPIOs in a certain bank. In such case the ACPI handle + * of a GPIO device is NULL and can not be used. Hence we have to check + * the parent device to be sure that there is no match before bailing + * out. + */ + if (gc->parent) + return device_match_acpi_handle(gc->parent, data); + + return false; } /** |