PCI: mediatek-gen3: Clean up mtk_pcie_parse_port() with dev_err_probe()

mtk_pcie_parse_port() in the pcie-mediatek-gen driver has a bunch of

  if (err) {
    dev_err(dev, "error message\n");
    return err; # or goto
  }

patterns.

Simplify these with dev_err_probe(). The system also gains proper deferred
probe messages that can be seen in:

  /sys/kernel/debug/devices_deferred

Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Link: https://patch.msgid.link/20260324052002.4072430-2-wenst@chromium.org

Author: wens

drivers/pci/controller/pcie-mediatek-gen3.c

@@ -876,10 +876,8 @@ static int mtk_pcie_parse_port(struct mtk_gen3_pcie *pcie)
 	if (!regs)
 		return -EINVAL;
 	pcie->base = devm_ioremap_resource(dev, regs);
-	if (IS_ERR(pcie->base)) {
-		dev_err(dev, "failed to map register base\n");
-		return PTR_ERR(pcie->base);
-	}
+	if (IS_ERR(pcie->base))
+		return dev_err_probe(dev, PTR_ERR(pcie->base), "failed to map register base\n");
 
 	pcie->reg_base = regs->start;
 
@@ -888,34 +886,20 @@ static int mtk_pcie_parse_port(struct mtk_gen3_pcie *pcie)
 
 	ret = devm_reset_control_bulk_get_optional_shared(dev, num_resets,
 							  pcie->phy_resets);
-	if (ret) {
-		dev_err(dev, "failed to get PHY bulk reset\n");
-		return ret;
-	}
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to get PHY bulk reset\n");
 
 	pcie->mac_reset = devm_reset_control_get_optional_exclusive(dev, "mac");
-	if (IS_ERR(pcie->mac_reset)) {
-		ret = PTR_ERR(pcie->mac_reset);
-		if (ret != -EPROBE_DEFER)
-			dev_err(dev, "failed to get MAC reset\n");
-
-		return ret;
-	}
+	if (IS_ERR(pcie->mac_reset))
+		return dev_err_probe(dev, PTR_ERR(pcie->mac_reset), "failed to get MAC reset\n");
 
 	pcie->phy = devm_phy_optional_get(dev, "pcie-phy");
-	if (IS_ERR(pcie->phy)) {
-		ret = PTR_ERR(pcie->phy);
-		if (ret != -EPROBE_DEFER)
-			dev_err(dev, "failed to get PHY\n");
-
-		return ret;
-	}
+	if (IS_ERR(pcie->phy))
+		return dev_err_probe(dev, PTR_ERR(pcie->phy), "failed to get PHY\n");
 
 	pcie->num_clks = devm_clk_bulk_get_all(dev, &pcie->clks);
-	if (pcie->num_clks < 0) {
-		dev_err(dev, "failed to get clocks\n");
-		return pcie->num_clks;
-	}
+	if (pcie->num_clks < 0)
+		return dev_err_probe(dev, pcie->num_clks, "failed to get clocks\n");
 
 	ret = of_property_read_u32(dev->of_node, "num-lanes", &num_lanes);
 	if (ret == 0) {