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From:   Harini Katakam <harini.katakam@xilinx.com>
To:     <nicolas.ferre@microchip.com>, <davem@davemloft.net>,
        <claudiu.beznea@microchip.com>
CC:     <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <michal.simek@xilinx.com>, <harinikatakamlinux@gmail.com>,
        <harini.katakam@xilinx.com>, Harini Katakam <harinik@xilinx.com>
Subject: [PATCH 2/4] net: macb: Support clock management for tsu_clk
Date:   Wed, 31 Oct 2018 09:10:21 +0530
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From: Harini Katakam <harinik@xilinx.com>

TSU clock needs to be enabled/disabled as per support in devicetree
and it should also be controlled during suspend/resume (WOL has no
dependency on this clock).

Signed-off-by: Harini Katakam <harinik@xilinx.com>
---
 drivers/net/ethernet/cadence/macb.h      |  3 ++-
 drivers/net/ethernet/cadence/macb_main.c | 30 +++++++++++++++++++++++++-----
 2 files changed, 27 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
index 3d45f4c..6f2b4b0 100644
--- a/drivers/net/ethernet/cadence/macb.h
+++ b/drivers/net/ethernet/cadence/macb.h
@@ -1082,7 +1082,7 @@ struct macb_config {
 	unsigned int		dma_burst_length;
 	int	(*clk_init)(struct platform_device *pdev, struct clk **pclk,
 			    struct clk **hclk, struct clk **tx_clk,
-			    struct clk **rx_clk);
+			    struct clk **rx_clk, struct clk **tsu_clk);
 	int	(*init)(struct platform_device *pdev);
 	int	jumbo_max_len;
 };
@@ -1162,6 +1162,7 @@ struct macb {
 	struct clk		*hclk;
 	struct clk		*tx_clk;
 	struct clk		*rx_clk;
+	struct clk		*tsu_clk;
 	struct net_device	*dev;
 	union {
 		struct macb_stats	macb;
diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index b4e26c1..7ae8d731 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -3304,7 +3304,7 @@ static void macb_probe_queues(void __iomem *mem,
 
 static int macb_clk_init(struct platform_device *pdev, struct clk **pclk,
 			 struct clk **hclk, struct clk **tx_clk,
-			 struct clk **rx_clk)
+			 struct clk **rx_clk, struct clk **tsu_clk)
 {
 	struct macb_platform_data *pdata;
 	int err;
@@ -3338,6 +3338,10 @@ static int macb_clk_init(struct platform_device *pdev, struct clk **pclk,
 	if (IS_ERR(*rx_clk))
 		*rx_clk = NULL;
 
+	*tsu_clk = devm_clk_get(&pdev->dev, "tsu_clk");
+	if (IS_ERR(*tsu_clk))
+		*tsu_clk = NULL;
+
 	err = clk_prepare_enable(*pclk);
 	if (err) {
 		dev_err(&pdev->dev, "failed to enable pclk (%u)\n", err);
@@ -3362,8 +3366,17 @@ static int macb_clk_init(struct platform_device *pdev, struct clk **pclk,
 		goto err_disable_txclk;
 	}
 
+	err = clk_prepare_enable(*tsu_clk);
+	if (err) {
+		dev_err(&pdev->dev, "failed to enable tsu_clk (%u)\n", err);
+		goto err_disable_rxclk;
+	}
+
 	return 0;
 
+err_disable_rxclk:
+	clk_disable_unprepare(*rx_clk);
+
 err_disable_txclk:
 	clk_disable_unprepare(*tx_clk);
 
@@ -3814,13 +3827,14 @@ static const struct net_device_ops at91ether_netdev_ops = {
 
 static int at91ether_clk_init(struct platform_device *pdev, struct clk **pclk,
 			      struct clk **hclk, struct clk **tx_clk,
-			      struct clk **rx_clk)
+			      struct clk **rx_clk, struct clk **tsu_clk)
 {
 	int err;
 
 	*hclk = NULL;
 	*tx_clk = NULL;
 	*rx_clk = NULL;
+	*tsu_clk = NULL;
 
 	*pclk = devm_clk_get(&pdev->dev, "ether_clk");
 	if (IS_ERR(*pclk))
@@ -3968,11 +3982,12 @@ static int macb_probe(struct platform_device *pdev)
 {
 	const struct macb_config *macb_config = &default_gem_config;
 	int (*clk_init)(struct platform_device *, struct clk **,
-			struct clk **, struct clk **,  struct clk **)
-					      = macb_config->clk_init;
+			struct clk **, struct clk **,  struct clk **,
+			struct clk **) = macb_config->clk_init;
 	int (*init)(struct platform_device *) = macb_config->init;
 	struct device_node *np = pdev->dev.of_node;
 	struct clk *pclk, *hclk = NULL, *tx_clk = NULL, *rx_clk = NULL;
+	struct clk *tsu_clk = NULL;
 	unsigned int queue_mask, num_queues;
 	struct macb_platform_data *pdata;
 	bool native_io;
@@ -4000,7 +4015,7 @@ static int macb_probe(struct platform_device *pdev)
 		}
 	}
 
-	err = clk_init(pdev, &pclk, &hclk, &tx_clk, &rx_clk);
+	err = clk_init(pdev, &pclk, &hclk, &tx_clk, &rx_clk, &tsu_clk);
 	if (err)
 		return err;
 
@@ -4037,6 +4052,7 @@ static int macb_probe(struct platform_device *pdev)
 	bp->hclk = hclk;
 	bp->tx_clk = tx_clk;
 	bp->rx_clk = rx_clk;
+	bp->tsu_clk = tsu_clk;
 	if (macb_config)
 		bp->jumbo_max_len = macb_config->jumbo_max_len;
 
@@ -4152,6 +4168,7 @@ static int macb_probe(struct platform_device *pdev)
 	clk_disable_unprepare(hclk);
 	clk_disable_unprepare(pclk);
 	clk_disable_unprepare(rx_clk);
+	clk_disable_unprepare(tsu_clk);
 
 	return err;
 }
@@ -4179,6 +4196,7 @@ static int macb_remove(struct platform_device *pdev)
 		clk_disable_unprepare(bp->hclk);
 		clk_disable_unprepare(bp->pclk);
 		clk_disable_unprepare(bp->rx_clk);
+		clk_disable_unprepare(bp->tsu_clk);
 		of_node_put(bp->phy_node);
 		free_netdev(dev);
 	}
@@ -4205,6 +4223,7 @@ static int __maybe_unused macb_suspend(struct device *dev)
 		clk_disable_unprepare(bp->pclk);
 		clk_disable_unprepare(bp->rx_clk);
 	}
+	clk_disable_unprepare(bp->tsu_clk);
 
 	return 0;
 }
@@ -4225,6 +4244,7 @@ static int __maybe_unused macb_resume(struct device *dev)
 		clk_prepare_enable(bp->tx_clk);
 		clk_prepare_enable(bp->rx_clk);
 	}
+	clk_prepare_enable(bp->tsu_clk);
 
 	netif_device_attach(netdev);
 
-- 
2.7.4