[PATCH 2/6] ACPI: bus: Add iterator for dependent devices

[Daniel Scally <djrscally@gmail.com>]

Add a helper macro to iterate over ACPI devices that are flagged
as consumers of an initial supplier ACPI device.

Signed-off-by: Daniel Scally <djrscally@gmail.com>
---
 include/acpi/acpi_bus.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 8b06fef04722..72103bcdd5b3 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -723,6 +723,18 @@ bool acpi_dev_ready_for_enumeration(const struct acpi_device *device);
 struct acpi_device *acpi_dev_get_next_consumer_dev(struct acpi_device *supplier,
 						   struct acpi_device *start);
 struct acpi_device *acpi_dev_get_first_consumer_dev(struct acpi_device *supplier);
+
+/**
+ * for_each_acpi_consumer_dev - iterate over the consumer ACPI devices for a
+ *				given supplier
+ * @supplier: Pointer to the supplier's ACPI device
+ * @consumer: Pointer to &struct acpi_device to hold the consumer, initially NULL
+ */
+#define for_each_acpi_consumer_dev(supplier, consumer)			\
+	for (consumer = acpi_dev_get_first_consumer_dev(supplier);	\
+	     consumer;							\
+	     consumer = acpi_dev_get_next_consumer_dev(supplier, consumer))
+
 struct acpi_device *
 acpi_dev_get_next_match_dev(struct acpi_device *adev, const char *hid, const char *uid, s64 hrv);
 struct acpi_device *
-- 
2.25.1