PCI: kirin: Tidy up _probe() related function with dev_err_probe()

The combination of dev_err() and the returned error code could be
replaced by dev_err_probe() in driver's probe function.

Thus, convert the code to use dev_err_probe() to make code simpler.

Suggested-by: Jonathan Cameron <[email protected]>
Signed-off-by: Zhang Zekun <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[kwilczynski: commit log, return -ETIMEDOUT from hi3660_pcie_phy_start()
rather than -EINVAL for when the PIPE clock fails to become stable,
drop redundant dev->of_node NULL check]
Signed-off-by: Krzysztof Wilczyński <[email protected]>

Author: Zhang Zekun

drivers/pci/controller/dwc/pcie-kirin.c

@@ -216,10 +216,9 @@ static int hi3660_pcie_phy_start(struct hi3660_pcie_phy *phy)
 
 	usleep_range(PIPE_CLK_WAIT_MIN, PIPE_CLK_WAIT_MAX);
 	reg_val = kirin_apb_phy_readl(phy, PCIE_APB_PHY_STATUS0);
-	if (reg_val & PIPE_CLK_STABLE) {
-		dev_err(dev, "PIPE clk is not stable\n");
-		return -EINVAL;
-	}
+	if (reg_val & PIPE_CLK_STABLE)
+		return dev_err_probe(dev, -ETIMEDOUT,
+				     "PIPE clk is not stable\n");
 
 	return 0;
 }
@@ -371,10 +370,9 @@ static int kirin_pcie_get_gpio_enable(struct kirin_pcie *pcie,
 	if (ret < 0)
 		return 0;
 
-	if (ret > MAX_PCI_SLOTS) {
-		dev_err(dev, "Too many GPIO clock requests!\n");
-		return -EINVAL;
-	}
+	if (ret > MAX_PCI_SLOTS)
+		return dev_err_probe(dev, -EINVAL,
+				     "Too many GPIO clock requests!\n");
 
 	pcie->n_gpio_clkreq = ret;
 
@@ -420,17 +418,16 @@ static int kirin_pcie_parse_port(struct kirin_pcie *pcie,
 						     "unable to get a valid reset gpio\n");
 			}
 
-			if (pcie->num_slots + 1 >= MAX_PCI_SLOTS) {
-				dev_err(dev, "Too many PCI slots!\n");
-				return -EINVAL;
-			}
+			if (pcie->num_slots + 1 >= MAX_PCI_SLOTS)
+				return dev_err_probe(dev, -EINVAL,
+						     "Too many PCI slots!\n");
+
 			pcie->num_slots++;
 
 			ret = of_pci_get_devfn(child);
-			if (ret < 0) {
-				dev_err(dev, "failed to parse devfn: %d\n", ret);
-				return ret;
-			}
+			if (ret < 0)
+				return dev_err_probe(dev, ret,
+						     "failed to parse devfn\n");
 
 			slot = PCI_SLOT(ret);
 
@@ -725,16 +722,9 @@ static int kirin_pcie_probe(struct platform_device *pdev)
 	struct dw_pcie *pci;
 	int ret;
 
-	if (!dev->of_node) {
-		dev_err(dev, "NULL node\n");
-		return -EINVAL;
-	}
-
 	data = of_device_get_match_data(dev);
-	if (!data) {
-		dev_err(dev, "OF data missing\n");
-		return -EINVAL;
-	}
+	if (!data)
+		return dev_err_probe(dev, -EINVAL, "OF data missing\n");
 
 	kirin_pcie = devm_kzalloc(dev, sizeof(struct kirin_pcie), GFP_KERNEL);
 	if (!kirin_pcie)