[PATCH 1/2] ACPI: Add helper acpi_use_parent_companion

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In several drivers devices use the ACPI companion of the parent.
Add a helper for this use case to avoid code duplication.

Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
---
 include/linux/acpi.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index ba3f601b6..89efb1658 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1541,4 +1541,9 @@ static inline void acpi_device_notify(struct device *dev) { }
 static inline void acpi_device_notify_remove(struct device *dev) { }
 #endif
 
+static inline void acpi_use_parent_companion(struct device *dev)
+{
+	ACPI_COMPANION_SET(dev, ACPI_COMPANION(dev->parent));
+}
+
 #endif	/*_LINUX_ACPI_H*/
-- 
2.42.0





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