diff --git a/Documentation/devicetree/bindings/net/fsl-tsec-phy.txt b/Documentation/devicetree/bindings/net/fsl-tsec-phy.txt
index 594982c6b9f9e2846163afa654f208ed74e888e1..79bf352e659cd1b999603317a62a7ec62fbac0b6 100644
--- a/Documentation/devicetree/bindings/net/fsl-tsec-phy.txt
+++ b/Documentation/devicetree/bindings/net/fsl-tsec-phy.txt
@@ -6,7 +6,11 @@ the definition of the PHY node in booting-without-of.txt for an example
 of how to define a PHY.
 
 Required properties:
-  - reg : Offset and length of the register set for the device
+  - reg : Offset and length of the register set for the device, and optionally
+          the offset and length of the TBIPA register (TBI PHY address
+	  register).  If TBIPA register is not specified, the driver will
+	  attempt to infer it from the register set specified (your mileage may
+	  vary).
   - compatible : Should define the compatible device type for the
     mdio. Currently supported strings/devices are:
 	- "fsl,gianfar-tbi"
diff --git a/drivers/net/ethernet/freescale/fsl_pq_mdio.c b/drivers/net/ethernet/freescale/fsl_pq_mdio.c
index 80ad16acf0f13ac32e7b09b1b3df05b30df44341..ac2c3f6a12bc6b2f4c3cd75a935271570e375656 100644
--- a/drivers/net/ethernet/freescale/fsl_pq_mdio.c
+++ b/drivers/net/ethernet/freescale/fsl_pq_mdio.c
@@ -377,6 +377,38 @@ static const struct of_device_id fsl_pq_mdio_match[] = {
 };
 MODULE_DEVICE_TABLE(of, fsl_pq_mdio_match);
 
+static void set_tbipa(const u32 tbipa_val, struct platform_device *pdev,
+		      uint32_t __iomem * (*get_tbipa)(void __iomem *),
+		      void __iomem *reg_map, struct resource *reg_res)
+{
+	struct device_node *np = pdev->dev.of_node;
+	uint32_t __iomem *tbipa;
+	bool tbipa_mapped;
+
+	tbipa = of_iomap(np, 1);
+	if (tbipa) {
+		tbipa_mapped = true;
+	} else {
+		tbipa_mapped = false;
+		tbipa = (*get_tbipa)(reg_map);
+
+		/*
+		 * Add consistency check to make sure TBI is contained within
+		 * the mapped range (not because we would get a segfault,
+		 * rather to catch bugs in computing TBI address). Print error
+		 * message but continue anyway.
+		 */
+		if ((void *)tbipa > reg_map + resource_size(reg_res) - 4)
+			dev_err(&pdev->dev, "invalid register map (should be at least 0x%04zx to contain TBI address)\n",
+				((void *)tbipa - reg_map) + 4);
+	}
+
+	iowrite32be(be32_to_cpu(tbipa_val), tbipa);
+
+	if (tbipa_mapped)
+		iounmap(tbipa);
+}
+
 static int fsl_pq_mdio_probe(struct platform_device *pdev)
 {
 	const struct of_device_id *id =
@@ -450,8 +482,6 @@ static int fsl_pq_mdio_probe(struct platform_device *pdev)
 
 		if (tbi) {
 			const u32 *prop = of_get_property(tbi, "reg", NULL);
-			uint32_t __iomem *tbipa;
-
 			if (!prop) {
 				dev_err(&pdev->dev,
 					"missing 'reg' property in node %pOF\n",
@@ -459,20 +489,8 @@ static int fsl_pq_mdio_probe(struct platform_device *pdev)
 				err = -EBUSY;
 				goto error;
 			}
-
-			tbipa = data->get_tbipa(priv->map);
-
-			/*
-			 * Add consistency check to make sure TBI is contained
-			 * within the mapped range (not because we would get a
-			 * segfault, rather to catch bugs in computing TBI
-			 * address). Print error message but continue anyway.
-			 */
-			if ((void *)tbipa > priv->map + resource_size(&res) - 4)
-				dev_err(&pdev->dev, "invalid register map (should be at least 0x%04zx to contain TBI address)\n",
-					((void *)tbipa - priv->map) + 4);
-
-			iowrite32be(be32_to_cpup(prop), tbipa);
+			set_tbipa(*prop, pdev,
+				  data->get_tbipa, priv->map, &res);
 		}
 	}