[U-Boot] [PATCH v4 08/11] dm: pci: Add an inline API to test if a device is on a PCI bus

[Bin Meng]

Introduce device_is_on_pci_bus() which can be utilized by driver
to test if a device is on a PCI bus.

Signed-off-by: Bin Meng <bmeng.cn at gmail.com>
Acked-by: Simon Glass <sjg at chromium.org>

---

Changes in v4: None
Changes in v3: None
Changes in v2:
- New patch to add an inline API to test if a device is on a PCI bus

 drivers/pci/pci-uclass.c |  4 ++--
 include/pci.h            | 15 +++++++++++++++
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
index ea70853..0756bbe 100644
--- a/drivers/pci/pci-uclass.c
+++ b/drivers/pci/pci-uclass.c
@@ -238,7 +238,7 @@ int dm_pci_write_config(struct udevice *dev, int offset, unsigned long value,
 {
 	struct udevice *bus;
 
-	for (bus = dev; device_get_uclass_id(bus->parent) == UCLASS_PCI;)
+	for (bus = dev; device_is_on_pci_bus(bus);)
 		bus = bus->parent;
 	return pci_bus_write_config(bus, pci_get_bdf(dev), offset, value, size);
 }
@@ -303,7 +303,7 @@ int dm_pci_read_config(struct udevice *dev, int offset, unsigned long *valuep,
 {
 	struct udevice *bus;
 
-	for (bus = dev; device_get_uclass_id(bus->parent) == UCLASS_PCI;)
+	for (bus = dev; device_is_on_pci_bus(bus);)
 		bus = bus->parent;
 	return pci_bus_read_config(bus, pci_get_bdf(dev), offset, valuep,
 				   size);
diff --git a/include/pci.h b/include/pci.h
index e24c970..293a021 100644
--- a/include/pci.h
+++ b/include/pci.h
@@ -1273,5 +1273,20 @@ struct pci_driver_entry {
 		.match = __match, \
 		}
 
+#ifdef CONFIG_DM
+#include <dm.h>
+
+/**
+ * device_is_on_pci_bus - Test if a device is on a PCI bus
+ *
+ * @dev:	device to test
+ * @return:	true if it is on a PCI bus, false otherwise
+ */
+static inline bool device_is_on_pci_bus(struct udevice *dev)
+{
+	return device_get_uclass_id(dev->parent) == UCLASS_PCI;
+}
+#endif
+
 #endif /* __ASSEMBLY__ */
 #endif /* _PCI_H */
-- 
1.8.2.1