phy: qcom-qmp-combo: clean up device-tree parsing

Since the QMP driver split there will be precisely two child nodes so
drop the obsolete iteration construct.

While at it, drop the verbose error logging that would have been printed
also on probe deferrals.

Note that there is no need to check if there are additional child nodes
(the kernel is not a devicetree validator), but let's return an error if
either child node is missing.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20221114110621.4639-21-johan+linaro@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

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

@@ -2575,13 +2575,12 @@ static int qmp_combo_probe(struct platform_device *pdev)
 {
 	struct qmp_combo *qmp;
 	struct device *dev = &pdev->dev;
-	struct device_node *child;
+	struct device_node *dp_np, *usb_np;
 	struct phy_provider *phy_provider;
 	void __iomem *serdes;
 	void __iomem *usb_serdes;
 	void __iomem *dp_serdes = NULL;
 	const struct qmp_phy_cfg *cfg = NULL;
-	int num, id, expected_phys;
 	int ret;
 
 	qmp = devm_kzalloc(dev, sizeof(*qmp), GFP_KERNEL);
@@ -2607,8 +2606,6 @@ static int qmp_combo_probe(struct platform_device *pdev)
 	if (IS_ERR(dp_serdes))
 		return PTR_ERR(dp_serdes);
 
-	expected_phys = 2;
-
 	mutex_init(&qmp->phy_mutex);
 
 	ret = qmp_combo_clk_init(dev, cfg);
@@ -2623,75 +2620,52 @@ static int qmp_combo_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	num = of_get_available_child_count(dev->of_node);
-	/* do we have a rogue child node ? */
-	if (num > expected_phys)
+	usb_np = of_get_child_by_name(dev->of_node, "usb3-phy");
+	if (!usb_np)
 		return -EINVAL;
 
+	dp_np = of_get_child_by_name(dev->of_node, "dp-phy");
+	if (!dp_np) {
+		of_node_put(usb_np);
+		return -EINVAL;
+	}
+
 	pm_runtime_set_active(dev);
 	ret = devm_pm_runtime_enable(dev);
 	if (ret)
-		return ret;
+		goto err_node_put;
 	/*
 	 * Prevent runtime pm from being ON by default. Users can enable
 	 * it using power/control in sysfs.
 	 */
 	pm_runtime_forbid(dev);
 
-	id = 0;
-	for_each_available_child_of_node(dev->of_node, child) {
-		if (of_node_name_eq(child, "dp-phy")) {
-			serdes = dp_serdes;
+	ret = qmp_combo_create_usb(dev, usb_np, usb_serdes, cfg);
+	if (ret)
+		goto err_node_put;
 
-			/* Create per-lane phy */
-			ret = qmp_combo_create_dp(dev, child, serdes, cfg);
-			if (ret) {
-				dev_err(dev, "failed to create lane%d phy, %d\n",
-					id, ret);
-				goto err_node_put;
-			}
+	ret = phy_pipe_clk_register(qmp, usb_np);
+	if (ret)
+		goto err_node_put;
 
-			ret = phy_dp_clks_register(qmp, child);
-			if (ret) {
-				dev_err(qmp->dev,
-					"failed to register DP clock source\n");
-				goto err_node_put;
-			}
-		} else if (of_node_name_eq(child, "usb3-phy")) {
-			serdes = usb_serdes;
+	ret = qmp_combo_create_dp(dev, dp_np, dp_serdes, cfg);
+	if (ret)
+		goto err_node_put;
 
-			/* Create per-lane phy */
-			ret = qmp_combo_create_usb(dev, child, serdes, cfg);
-			if (ret) {
-				dev_err(dev, "failed to create lane%d phy, %d\n",
-					id, ret);
-				goto err_node_put;
-			}
-
-			/*
-			 * Register the pipe clock provided by phy.
-			 * See function description to see details of this pipe clock.
-			 */
-			ret = phy_pipe_clk_register(qmp, child);
-			if (ret) {
-				dev_err(qmp->dev,
-					"failed to register pipe clock source\n");
-				goto err_node_put;
-			}
-		}
-
-		id++;
-	}
-
-	if (!qmp->usb_phy)
-		return -EINVAL;
+	ret = phy_dp_clks_register(qmp, dp_np);
+	if (ret)
+		goto err_node_put;
 
 	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 
+	of_node_put(usb_np);
+	of_node_put(dp_np);
+
 	return PTR_ERR_OR_ZERO(phy_provider);
 
 err_node_put:
-	of_node_put(child);
+	of_node_put(usb_np);
+	of_node_put(dp_np);
 	return ret;
 }