netdev - [PATCH v11 10/10] net: ti: icssg-prueth: Add Power management support

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Date: Mon, 24 Jul 2023 16:59:34 +0530
From: MD Danish Anwar <danishanwar@...com>
To: Randy Dunlap <rdunlap@...radead.org>, Roger Quadros <rogerq@...nel.org>,
        Simon Horman <simon.horman@...igine.com>,
        Vignesh Raghavendra
	<vigneshr@...com>, Andrew Lunn <andrew@...n.ch>,
        Richard Cochran
	<richardcochran@...il.com>,
        Conor Dooley <conor+dt@...nel.org>,
        Krzysztof
 Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring
	<robh+dt@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski
	<kuba@...nel.org>, Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller"
	<davem@...emloft.net>,
        MD Danish Anwar <danishanwar@...com>
CC: <nm@...com>, <srk@...com>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-omap@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH v11 10/10] net: ti: icssg-prueth: Add Power management support

Add suspend / resume APIs to support power management in ICSSG ethernet
driver.

Signed-off-by: MD Danish Anwar <danishanwar@...com>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
---
 drivers/net/ethernet/ti/icssg_prueth.c | 57 ++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)

diff --git a/drivers/net/ethernet/ti/icssg_prueth.c b/drivers/net/ethernet/ti/icssg_prueth.c
index a34e29ed3351..53d93a33c64d 100644
--- a/drivers/net/ethernet/ti/icssg_prueth.c
+++ b/drivers/net/ethernet/ti/icssg_prueth.c
@@ -1835,6 +1835,62 @@ static int prueth_remove(struct platform_device *pdev)
 	return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int prueth_suspend(struct device *dev)
+{
+	struct prueth *prueth = dev_get_drvdata(dev);
+	struct net_device *ndev;
+	int i, ret;
+
+	for (i = 0; i < PRUETH_NUM_MACS; i++) {
+		ndev = prueth->registered_netdevs[i];
+
+		if (!ndev)
+			continue;
+
+		if (netif_running(ndev)) {
+			netif_device_detach(ndev);
+			ret = emac_ndo_stop(ndev);
+			if (ret < 0) {
+				netdev_err(ndev, "failed to stop: %d", ret);
+				return ret;
+			}
+		}
+	}
+
+	return 0;
+}
+
+static int prueth_resume(struct device *dev)
+{
+	struct prueth *prueth = dev_get_drvdata(dev);
+	struct net_device *ndev;
+	int i, ret;
+
+	for (i = 0; i < PRUETH_NUM_MACS; i++) {
+		ndev = prueth->registered_netdevs[i];
+
+		if (!ndev)
+			continue;
+
+		if (netif_running(ndev)) {
+			ret = emac_ndo_open(ndev);
+			if (ret < 0) {
+				netdev_err(ndev, "failed to start: %d", ret);
+				return ret;
+			}
+			netif_device_attach(ndev);
+		}
+	}
+
+	return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct dev_pm_ops prueth_dev_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(prueth_suspend, prueth_resume)
+};
+
 static const struct prueth_pdata am654_icssg_pdata = {
 	.fdqring_mode = K3_RINGACC_RING_MODE_MESSAGE,
 	.quirk_10m_link_issue = 1,
@@ -1852,6 +1908,7 @@ static struct platform_driver prueth_driver = {
 	.driver = {
 		.name = "icssg-prueth",
 		.of_match_table = prueth_dt_match,
+		.pm = &prueth_dev_pm_ops,
 	},
 };
 module_platform_driver(prueth_driver);
-- 
2.34.1