net: broadcom: convert to devm_platform_ioremap_resource_byname()

Use the function devm_platform_ioremap_resource_byname() to simplify
source code which calls the functions platform_get_resource_byname()
and devm_ioremap_resource(). Remove also a few error messages which
became unnecessary with this software refactoring.
Suggested-by: Markus Elfring <Markus.Elfring@web.de>
Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bgmac-platform.c

@@ -172,7 +172,6 @@ static int bgmac_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	struct bgmac *bgmac;
-	struct resource *regs;
 	const u8 *mac_addr;
 
 	bgmac = bgmac_alloc(&pdev->dev);
@@ -202,31 +201,21 @@ static int bgmac_probe(struct platform_device *pdev)
 	if (bgmac->irq < 0)
 		return bgmac->irq;
 
-	regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "amac_base");
-	if (!regs) {
-		dev_err(&pdev->dev, "Unable to obtain base resource\n");
-		return -EINVAL;
-	}
-
-	bgmac->plat.base = devm_ioremap_resource(&pdev->dev, regs);
+	bgmac->plat.base =
+		devm_platform_ioremap_resource_byname(pdev, "amac_base");
 	if (IS_ERR(bgmac->plat.base))
 		return PTR_ERR(bgmac->plat.base);
 
-	regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "idm_base");
-	if (regs) {
-		bgmac->plat.idm_base = devm_ioremap_resource(&pdev->dev, regs);
-		if (IS_ERR(bgmac->plat.idm_base))
-			return PTR_ERR(bgmac->plat.idm_base);
-		bgmac->feature_flags &= ~BGMAC_FEAT_IDM_MASK;
-	}
+	bgmac->plat.idm_base =
+		devm_platform_ioremap_resource_byname(pdev, "idm_base");
+	if (IS_ERR(bgmac->plat.idm_base))
+		return PTR_ERR(bgmac->plat.idm_base);
+	bgmac->feature_flags &= ~BGMAC_FEAT_IDM_MASK;
 
-	regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nicpm_base");
-	if (regs) {
-		bgmac->plat.nicpm_base = devm_ioremap_resource(&pdev->dev,
-							       regs);
-		if (IS_ERR(bgmac->plat.nicpm_base))
-			return PTR_ERR(bgmac->plat.nicpm_base);
-	}
+	bgmac->plat.nicpm_base =
+		devm_platform_ioremap_resource_byname(pdev, "nicpm_base");
+	if (IS_ERR(bgmac->plat.nicpm_base))
+		return PTR_ERR(bgmac->plat.nicpm_base);
 
 	bgmac->read = platform_bgmac_read;
 	bgmac->write = platform_bgmac_write;