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-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 b58be12ab277..0ee42c3e66a1 100644
--- a/drivers/of/of_pci.c
+++ b/drivers/of/of_pci.c
@@ -120,6 +120,27 @@ int of_get_pci_domain_nr(struct device_node *node)
EXPORT_SYMBOL_GPL(of_get_pci_domain_nr);
/**
+ * This function will try to find the limitation of link speed by finding
+ * a property called "max-link-speed" of the given device node.
+ *
+ * @node: device tree node with the max link speed information
+ *
+ * Returns the associated max link speed from DT, or a negative value if the
+ * required property is not found or is invalid.
+ */
+int of_pci_get_max_link_speed(struct device_node *node)
+{
+ u32 max_link_speed;
+
+ if (of_property_read_u32(node, "max-link-speed", &max_link_speed) ||
+ max_link_speed > 4)
+ return -EINVAL;
+
+ return max_link_speed;
+}
+EXPORT_SYMBOL_GPL(of_pci_get_max_link_speed);
+
+/**
* of_pci_check_probe_only - Setup probe only mode if linux,pci-probe-only
* is present and valid
*/