net: macb: add polarfire soc reset support

To date, the Microchip PolarFire SoC (MPFS) has been using the
cdns,macb compatible, however the generic device does not have reset
support. Add a new compatible & .data for MPFS to hook into the reset
functionality added for zynqmp support (and make the zynqmp init
function generic in the process).

Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/cadence/macb_main.c

@@ -4689,34 +4689,32 @@ static const struct macb_config np4_config = {
 	.usrio = &macb_default_usrio,
 };
 
-static int zynqmp_init(struct platform_device *pdev)
+static int init_reset_optional(struct platform_device *pdev)
 {
 	struct net_device *dev = platform_get_drvdata(pdev);
 	struct macb *bp = netdev_priv(dev);
 	int ret;
 
 	if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII) {
-		/* Ensure PS-GTR PHY device used in SGMII mode is ready */
+		/* Ensure PHY device used in SGMII mode is ready */
 		bp->sgmii_phy = devm_phy_optional_get(&pdev->dev, NULL);
 
 		if (IS_ERR(bp->sgmii_phy)) {
 			ret = PTR_ERR(bp->sgmii_phy);
 			dev_err_probe(&pdev->dev, ret,
-				      "failed to get PS-GTR PHY\n");
+				      "failed to get SGMII PHY\n");
 			return ret;
 		}
 
 		ret = phy_init(bp->sgmii_phy);
 		if (ret) {
-			dev_err(&pdev->dev, "failed to init PS-GTR PHY: %d\n",
+			dev_err(&pdev->dev, "failed to init SGMII PHY: %d\n",
 				ret);
 			return ret;
 		}
 	}
 
-	/* Fully reset GEM controller at hardware level using zynqmp-reset driver,
-	 * if mapped in device tree.
-	 */
+	/* Fully reset controller at hardware level if mapped in device tree */
 	ret = device_reset_optional(&pdev->dev);
 	if (ret) {
 		dev_err_probe(&pdev->dev, ret, "failed to reset controller");
@@ -4737,7 +4735,7 @@ static const struct macb_config zynqmp_config = {
 			MACB_CAPS_GEM_HAS_PTP | MACB_CAPS_BD_RD_PREFETCH,
 	.dma_burst_length = 16,
 	.clk_init = macb_clk_init,
-	.init = zynqmp_init,
+	.init = init_reset_optional,
 	.jumbo_max_len = 10240,
 	.usrio = &macb_default_usrio,
 };
@@ -4751,6 +4749,17 @@ static const struct macb_config zynq_config = {
 	.usrio = &macb_default_usrio,
 };
 
+static const struct macb_config mpfs_config = {
+	.caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE |
+		MACB_CAPS_JUMBO |
+		MACB_CAPS_GEM_HAS_PTP,
+	.dma_burst_length = 16,
+	.clk_init = macb_clk_init,
+	.init = init_reset_optional,
+	.usrio = &macb_default_usrio,
+	.jumbo_max_len = 10240,
+};
+
 static const struct macb_config sama7g5_gem_config = {
 	.caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_CLK_HW_CHG |
 		MACB_CAPS_MIIONRGMII,
@@ -4787,6 +4796,7 @@ static const struct of_device_id macb_dt_ids[] = {
 	{ .compatible = "cdns,zynqmp-gem", .data = &zynqmp_config},
 	{ .compatible = "cdns,zynq-gem", .data = &zynq_config },
 	{ .compatible = "sifive,fu540-c000-gem", .data = &fu540_c000_config },
+	{ .compatible = "microchip,mpfs-macb", .data = &mpfs_config },
 	{ .compatible = "microchip,sama7g5-gem", .data = &sama7g5_gem_config },
 	{ .compatible = "microchip,sama7g5-emac", .data = &sama7g5_emac_config },
 	{ /* sentinel */ }