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path: root/drivers/of/of_pci.c
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Diffstat (limited to 'drivers/of/of_pci.c')
-rw-r--r--drivers/of/of_pci.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
index 62426d81a4d6..5751dc5b6494 100644
--- a/drivers/of/of_pci.c
+++ b/drivers/of/of_pci.c
@@ -2,6 +2,7 @@
#include <linux/export.h>
#include <linux/of.h>
#include <linux/of_address.h>
+#include <linux/of_device.h>
#include <linux/of_pci.h>
#include <linux/slab.h>
@@ -116,6 +117,26 @@ int of_get_pci_domain_nr(struct device_node *node)
}
EXPORT_SYMBOL_GPL(of_get_pci_domain_nr);
+/**
+ * of_pci_dma_configure - Setup DMA configuration
+ * @dev: ptr to pci_dev struct of the PCI device
+ *
+ * Function to update PCI devices's DMA configuration using the same
+ * info from the OF node of host bridge's parent (if any).
+ */
+void of_pci_dma_configure(struct pci_dev *pci_dev)
+{
+ struct device *dev = &pci_dev->dev;
+ struct device *bridge = pci_get_host_bridge_device(pci_dev);
+
+ if (!bridge->parent)
+ return;
+
+ of_dma_configure(dev, bridge->parent->of_node);
+ pci_put_host_bridge_device(bridge);
+}
+EXPORT_SYMBOL_GPL(of_pci_dma_configure);
+
#if defined(CONFIG_OF_ADDRESS)
/**
* of_pci_get_host_bridge_resources - Parse PCI host bridge resources from DT