ACPI / bus: Make acpi_get_first_physical_node() public

Following the fwnode of a device is currently a one-way road: We provide
ACPI_COMPANION() to obtain the fwnode but there's no (public) method to
do the reverse. Granted, there may be multiple physical_nodes, but often
the first one in the list is sufficient.

A handy function to obtain it was introduced with commit 3b95bd160547
("ACPI: introduce a function to find the first physical device"), but
currently it's only available internally.

We're about to add an EFI Device Path parser which needs this function.
Consider the following device path: ACPI(PNP0A03,0)/PCI(28,2)/PCI(0,0)
The PCI root is encoded as an ACPI device in the path, so the parser
has to find the corresponding ACPI device, then find its physical node,
find the PCI bridge in slot 1c (decimal 28), function 2 below it and
finally find the PCI device in slot 0, function 0.

To this end, make acpi_get_first_physical_node() public.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 940218ff01938816c6346f981c32d976ca250cb5..bd7c52dd883acb6da30c50347e5847dce341d688 100644 (file)
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -116,7 +116,6 @@ bool acpi_device_is_present(struct acpi_device *adev);
 bool acpi_device_is_battery(struct acpi_device *adev);
 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
                                        const struct device *dev);
-struct device *acpi_get_first_physical_node(struct acpi_device *adev);
 
 /* --------------------------------------------------------------------------
                      Device Matching and Notification

diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 4d8452c2384b6c23fbffa50352886e2b4ba04075..536c12ed2669b64150ca04b194e61f098eb9d259 100644 (file)
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -85,6 +85,8 @@ static inline const char *acpi_dev_name(struct acpi_device *adev)
        return dev_name(&adev->dev);
 }
 
+struct device *acpi_get_first_physical_node(struct acpi_device *adev);
+
 enum acpi_irq_model_id {
        ACPI_IRQ_MODEL_PIC = 0,
        ACPI_IRQ_MODEL_IOAPIC,
@@ -634,6 +636,11 @@ static inline const char *acpi_dev_name(struct acpi_device *adev)
        return NULL;
 }
 
+static inline struct device *acpi_get_first_physical_node(struct acpi_device *adev)
+{
+       return NULL;
+}
+
 static inline void acpi_early_init(void) { }
 static inline void acpi_subsystem_init(void) { }