PCI: layerscape: Use syscon_regmap_lookup_by_phandle_args

Use syscon_regmap_lookup_by_phandle_args() which is a wrapper over
syscon_regmap_lookup_by_phandle() combined with getting the syscon
argument.  Except simpler code this annotates within one line that given
phandle has arguments, so grepping for code would be easier.

Link: https://lore.kernel.org/r/20250112-syscon-phandle-args-pci-v1-2-fcb6ebcc0afc@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Roy Zang <Roy.Zang@nxp.com>

Author: krzk

drivers/pci/controller/dwc/pci-layerscape.c

@@ -329,7 +329,6 @@ static int ls_pcie_probe(struct platform_device *pdev)
 	struct ls_pcie *pcie;
 	struct resource *dbi_base;
 	u32 index[2];
-	int ret;
 
 	pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
 	if (!pcie)
@@ -355,16 +354,15 @@ static int ls_pcie_probe(struct platform_device *pdev)
 	pcie->pf_lut_base = pci->dbi_base + pcie->drvdata->pf_lut_off;
 
 	if (pcie->drvdata->scfg_support) {
-		pcie->scfg = syscon_regmap_lookup_by_phandle(dev->of_node, "fsl,pcie-scfg");
+		pcie->scfg =
+			syscon_regmap_lookup_by_phandle_args(dev->of_node,
+							     "fsl,pcie-scfg", 2,
+							     index);
 		if (IS_ERR(pcie->scfg)) {
 			dev_err(dev, "No syscfg phandle specified\n");
 			return PTR_ERR(pcie->scfg);
 		}
 
-		ret = of_property_read_u32_array(dev->of_node, "fsl,pcie-scfg", index, 2);
-		if (ret)
-			return ret;
-
 		pcie->index = index[1];
 	}