[PATCH net-next v3 3/7] net: ftgmac100: Add reset toggling for Aspeed SOCs

[Jacky Chou <jacky_chou@aspeedtech.com>]

Toggle the SCU reset before hardware initialization.

Signed-off-by: Jacky Chou <jacky_chou@aspeedtech.com>
---
 drivers/net/ethernet/faraday/ftgmac100.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index 17ec35e75a65..1840f7089676 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -9,6 +9,7 @@
 #define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
 
 #include <linux/clk.h>
+#include <linux/reset.h>
 #include <linux/dma-mapping.h>
 #include <linux/etherdevice.h>
 #include <linux/ethtool.h>
@@ -98,6 +99,7 @@ struct ftgmac100 {
 	struct work_struct reset_task;
 	struct mii_bus *mii_bus;
 	struct clk *clk;
+	struct reset_control *rst;
 
 	/* AST2500/AST2600 RMII ref clock gate */
 	struct clk *rclk;
@@ -1979,6 +1981,24 @@ static int ftgmac100_probe(struct platform_device *pdev)
 				  priv->base + FTGMAC100_OFFSET_TM);
 	}
 
+	priv->rst = devm_reset_control_get_optional_exclusive(priv->dev, NULL);
+	if (IS_ERR(priv->rst))
+		goto err_register_netdev;
+	if (!priv->rst)
+		dev_info(&pdev->dev, "no reset control found\n");
+
+	err = reset_control_assert(priv->rst);
+	if (err) {
+		dev_err(priv->dev, "Failed to reset mac (%d)\n", err);
+		goto err_register_netdev;
+	}
+	usleep_range(10000, 20000);
+	err = reset_control_deassert(priv->rst);
+	if (err) {
+		dev_err(priv->dev, "Failed to deassert mac reset (%d)\n", err);
+		goto err_register_netdev;
+	}
+
 	/* Default ring sizes */
 	priv->rx_q_entries = priv->new_rx_q_entries = DEF_RX_QUEUE_ENTRIES;
 	priv->tx_q_entries = priv->new_tx_q_entries = DEF_TX_QUEUE_ENTRIES;
-- 
2.25.1