net: ethernet: mtk_eth_soc: support named IRQs

Add named interrupts and keep index based fallback for exiting devicetrees.

Currently only rx and tx IRQs are defined to be used with mt7988, but
later extended with RSS/LRO support.

Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Signed-off-by: NipaLocal <nipa@local>

Author: frank-w

drivers/net/ethernet/mediatek/mtk_eth_soc.c

@@ -5105,17 +5105,23 @@ static int mtk_probe(struct platform_device *pdev)
 		}
 	}
 
-	for (i = 0; i < 3; i++) {
-		if (MTK_HAS_CAPS(eth->soc->caps, MTK_SHARED_INT) && i > 0)
-			eth->irq[i] = eth->irq[0];
-		else
-			eth->irq[i] = platform_get_irq(pdev, i);
-		if (eth->irq[i] < 0) {
-			dev_err(&pdev->dev, "no IRQ%d resource found\n", i);
-			err = -ENXIO;
-			goto err_wed_exit;
+	eth->irq[1] = platform_get_irq_byname(pdev, "tx");
+	eth->irq[2] = platform_get_irq_byname(pdev, "rx");
+	if (eth->irq[1] < 0 || eth->irq[2] < 0) {
+		for (i = 0; i < 3; i++) {
+			if (MTK_HAS_CAPS(eth->soc->caps, MTK_SHARED_INT) && i > 0)
+				eth->irq[i] = eth->irq[0];
+			else
+				eth->irq[i] = platform_get_irq(pdev, i);
+
+			if (eth->irq[i] < 0) {
+				dev_err(&pdev->dev, "no IRQ%d resource found\n", i);
+				err = -ENXIO;
+				goto err_wed_exit;
+			}
 		}
 	}
+
 	for (i = 0; i < ARRAY_SIZE(eth->clks); i++) {
 		eth->clks[i] = devm_clk_get(eth->dev,
 					    mtk_clks_source_name[i]);