ACPI: Add support for ResourceSource/IRQ domain mapping

ACPI extended IRQ resources may contain a ResourceSource to specify
an alternate interrupt controller. Introduce acpi_irq_get and use it
to implement ResourceSource/IRQ domain mapping.

The new API is similar to of_irq_get and allows re-initialization
of a platform resource from the ACPI extended IRQ resource, and
provides proper behavior for probe deferral when the domain is not
yet present when called.

Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Agustin Vega-Frias <agustinv@codeaurora.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index c4af00385502..647e4761dbf3 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -102,6 +102,16 @@ int platform_get_irq(struct platform_device *dev, unsigned int num)
         }
 
         r = platform_get_resource(dev, IORESOURCE_IRQ, num);
+        if (has_acpi_companion(&dev->dev)) {
+                if (r && r->flags & IORESOURCE_DISABLED) {
+                        int ret;
+
+                        ret = acpi_irq_get(ACPI_HANDLE(&dev->dev), num, r);
+                        if (ret)
+                                return ret;
+                }
+        }
+
         /*
          * The resources may pass trigger flags to the irqs that need
          * to be set up. It so happens that the trigger flags for