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-rw-r--r--drivers/base/platform.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 1c958eb33ef4..0d3611cd1b3b 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -127,7 +127,20 @@ int platform_get_irq(struct platform_device *dev, unsigned int num)
irqd_set_trigger_type(irqd, r->flags & IORESOURCE_BITS);
}
- return r ? r->start : -ENXIO;
+ if (r)
+ return r->start;
+
+ /*
+ * For the index 0 interrupt, allow falling back to GpioInt
+ * resources. While a device could have both Interrupt and GpioInt
+ * resources, making this fallback ambiguous, in many common cases
+ * the device will only expose one IRQ, and this fallback
+ * allows a common code path across either kind of resource.
+ */
+ if (num == 0 && has_acpi_companion(&dev->dev))
+ return acpi_dev_gpio_irq_get(ACPI_COMPANION(&dev->dev), num);
+
+ return -ENXIO;
#endif
}
EXPORT_SYMBOL_GPL(platform_get_irq);