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@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
index 117eb22..47c5377 100644 (file)
--- a/drivers/net/ethernet/renesas/ravb.h
+++ b/drivers/net/ethernet/renesas/ravb.h
@@ -1057,6 +1057,7 @@ struct ravb_private {
        unsigned int num_tx_desc;       /* TX descriptors per packet */
 
        const struct ravb_hw_info *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 7a144b4..0f85f2d 100644 (file)
--- 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>
 
@@ -2140,6 +2141,7 @@ static int ravb_probe(struct platform_device *pdev)
 {
        struct device_node *np = pdev->dev.of_node;
        const struct ravb_hw_info *info;
+       struct reset_control *rstc;
        struct ravb_private *priv;
        struct net_device *ndev;
        int error, irq, q;
@@ -2152,6 +2154,11 @@ 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)
@@ -2162,6 +2169,7 @@ 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);
 
@@ -2179,6 +2187,7 @@ 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;
@@ -2349,6 +2358,7 @@ out_release:
 
        pm_runtime_put(&pdev->dev);
        pm_runtime_disable(&pdev->dev);
+       reset_control_assert(rstc);
        return error;
 }
 
@@ -2374,6 +2384,7 @@ 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);