netdev - [PATCH net-next 16/18] ravb: Add reset support

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Date:   Thu, 22 Jul 2021 15:13:49 +0100
From:   Biju Das <biju.das.jz@...renesas.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Biju Das <biju.das.jz@...renesas.com>,
        Sergei Shtylyov <sergei.shtylyov@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Sergey Shtylyov <s.shtylyov@...russia.ru>,
        Adam Ford <aford173@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Yuusuke Ashizuka <ashiduka@...itsu.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>,
        Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH net-next 16/18] ravb: Add reset support

Reset support is present on R-Car. Let's support it, if it is
available.

Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
 drivers/net/ethernet/renesas/ravb.h      |  1 +
 drivers/net/ethernet/renesas/ravb_main.c | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
index f1de095f21d9..af06e849db47 100644
--- a/drivers/net/ethernet/renesas/ravb.h
+++ b/drivers/net/ethernet/renesas/ravb.h
@@ -1067,6 +1067,7 @@ struct ravb_private {
 	int num_tx_desc;		/* TX descriptors per packet */
 
 	const struct ravb_drv_data *info;
+	struct reset_control *rstc;
 };
 
 static inline u32 ravb_read(struct net_device *ndev, enum ravb_reg reg)
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 5a375ac962a0..5a83dd83c635 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -29,6 +29,7 @@
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/sys_soc.h>
+#include <linux/reset.h>
 
 #include <asm/div64.h>
 
@@ -2204,6 +2205,7 @@ static int ravb_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	const struct ravb_drv_data *info;
+	struct reset_control *rstc;
 	struct ravb_private *priv;
 	struct net_device *ndev;
 	int error, irq, q;
@@ -2216,6 +2218,11 @@ static int ravb_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
+	rstc = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
+	if (IS_ERR(rstc))
+		return dev_err_probe(&pdev->dev, PTR_ERR(rstc),
+				     "failed to get cpg reset\n");
+
 	ndev = alloc_etherdev_mqs(sizeof(struct ravb_private),
 				  NUM_TX_QUEUE, NUM_RX_QUEUE);
 	if (!ndev)
@@ -2226,6 +2233,7 @@ static int ravb_probe(struct platform_device *pdev)
 	ndev->features = info->net_features;
 	ndev->hw_features = info->net_hw_features;
 
+	reset_control_deassert(rstc);
 	pm_runtime_enable(&pdev->dev);
 	pm_runtime_get_sync(&pdev->dev);
 
@@ -2243,6 +2251,7 @@ static int ravb_probe(struct platform_device *pdev)
 
 	priv = netdev_priv(ndev);
 	priv->info = info;
+	priv->rstc = rstc;
 	priv->ndev = ndev;
 	priv->pdev = pdev;
 	priv->num_tx_ring[RAVB_BE] = BE_TX_RING_SIZE;
@@ -2414,6 +2423,7 @@ static int ravb_probe(struct platform_device *pdev)
 
 	pm_runtime_put(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
+	reset_control_assert(rstc);
 	return error;
 }
 
@@ -2439,6 +2449,7 @@ static int ravb_remove(struct platform_device *pdev)
 	netif_napi_del(&priv->napi[RAVB_BE]);
 	ravb_mdio_release(priv);
 	pm_runtime_disable(&pdev->dev);
+	reset_control_assert(priv->rstc);
 	free_netdev(ndev);
 	platform_set_drvdata(pdev, NULL);
 
-- 
2.17.1