phy: ti: gmii-sel: add resume support

The resume callback restores the submode of each PHY.

It uses the submode stored in struct phy_gmii_sel_phy_priv (variable
phy_if_mode). The submode was saved by the set_mode PHY operation.
Signed-off-by: Thomas Richard <thomas.richard@bootlin.com>
Link: https://lore.kernel.org/r/20240125171754.773909-1-thomas.richard@bootlin.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/ti/phy-gmii-sel.c

@@ -494,11 +494,35 @@ static int phy_gmii_sel_probe(struct platform_device *pdev)
 	return 0;
 }
 
+static int phy_gmii_sel_resume_noirq(struct device *dev)
+{
+	struct phy_gmii_sel_priv *priv = dev_get_drvdata(dev);
+	struct phy_gmii_sel_phy_priv *if_phys = priv->if_phys;
+	int ret, i;
+
+	for (i = 0; i < priv->num_ports; i++) {
+		if (if_phys[i].phy_if_mode) {
+			ret = phy_gmii_sel_mode(if_phys[i].if_phy,
+						PHY_MODE_ETHERNET, if_phys[i].phy_if_mode);
+			if (ret) {
+				dev_err(dev, "port%u: restore mode fail %d\n",
+					if_phys[i].if_phy->id, ret);
+				return ret;
+			}
+		}
+	}
+
+	return 0;
+}
+
+static DEFINE_NOIRQ_DEV_PM_OPS(phy_gmii_sel_pm_ops, NULL, phy_gmii_sel_resume_noirq);
+
 static struct platform_driver phy_gmii_sel_driver = {
 	.probe		= phy_gmii_sel_probe,
 	.driver		= {
 		.name	= "phy-gmii-sel",
 		.of_match_table = phy_gmii_sel_id_table,
+		.pm = pm_sleep_ptr(&phy_gmii_sel_pm_ops),
 	},
 };
 module_platform_driver(phy_gmii_sel_driver);