phy: qcom-qmp-combo: drop unused legacy DT workaround

Commit 5e17b95d ("phy: qcom-qmp: Utilize fully-specified DT
registers") added a workaround for legacy devicetrees which did not
specify register regions for the second lane of some dual-lane PHYs.

At the time, the only two dual-lane PHYs supported by mainline were
"qcom,sdm845-qmp-usb3-phy" and "qcom,sdm845-qmp-ufs-phy", neither
of which is a combo PHY.

Drop the workaround for malformed devicetrees, which should no longer be
needed since the QMP driver split.
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20220916102340.11520-10-johan+linaro@kernel.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/qualcomm/phy-qcom-qmp-combo.c

@@ -66,9 +66,6 @@
 #define POWER_DOWN_DELAY_US_MIN			10
 #define POWER_DOWN_DELAY_US_MAX			11
 
-/* Define the assumed distance between lanes for underspecified device trees. */
-#define QMP_PHY_LEGACY_LANE_STRIDE		0x400
-
 struct qmp_phy_init_tbl {
 	unsigned int offset;
 	unsigned int val;
@@ -2729,28 +2726,16 @@ static int qmp_combo_create(struct device *dev, struct device_node *np, int id,
 	if (cfg->pcs_usb_offset)
 		qphy->pcs_usb = qphy->pcs + cfg->pcs_usb_offset;
 
-	/*
-	 * If this is a dual-lane PHY, then there should be registers for the
-	 * second lane. Some old device trees did not specify this, so fall
-	 * back to old legacy behavior of assuming they can be reached at an
-	 * offset from the first lane.
-	 */
 	if (cfg->is_dual_lane_phy) {
 		qphy->tx2 = devm_of_iomap(dev, np, 3, NULL);
-		qphy->rx2 = devm_of_iomap(dev, np, 4, NULL);
-		if (IS_ERR(qphy->tx2) || IS_ERR(qphy->rx2)) {
-			dev_warn(dev,
-				 "Underspecified device tree, falling back to legacy register regions\n");
+		if (IS_ERR(qphy->tx2))
+			return PTR_ERR(qphy->tx2);
 
-			/* In the old version, pcs_misc is at index 3. */
-			qphy->pcs_misc = qphy->tx2;
-			qphy->tx2 = qphy->tx + QMP_PHY_LEGACY_LANE_STRIDE;
-			qphy->rx2 = qphy->rx + QMP_PHY_LEGACY_LANE_STRIDE;
-
-		} else {
-			qphy->pcs_misc = devm_of_iomap(dev, np, 5, NULL);
-		}
+		qphy->rx2 = devm_of_iomap(dev, np, 4, NULL);
+		if (IS_ERR(qphy->rx2))
+			return PTR_ERR(qphy->rx2);
 
+		qphy->pcs_misc = devm_of_iomap(dev, np, 5, NULL);
 	} else {
 		qphy->pcs_misc = devm_of_iomap(dev, np, 3, NULL);
 	}