phy: qcom-qmp-ufs: drop 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" and they had
been added to the binding less than six months before the binding was
fixed.

Presumably no one is using four-year old SDM845 dtbs with mainline
anymore so drop the workaround for malformed devicetrees. In the
unlikely event that anyone complains, we can consider reverting.
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20220916102340.11520-11-johan+linaro@kernel.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

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

@@ -38,9 +38,6 @@
 
 #define PHY_INIT_COMPLETE_TIMEOUT		10000
 
-/* 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;
@@ -1137,28 +1134,16 @@ static int qmp_ufs_create(struct device *dev, struct device_node *np, int id,
 	if (IS_ERR(qphy->pcs))
 		return PTR_ERR(qphy->pcs);
 
-	/*
-	 * 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);
 	}