net: ethernet: ravb: Enable optional refclk

For devices that use a programmable clock for the AVB reference clock,
the driver may need to enable them.  Add code to find the optional clock
and enable it when available.

Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
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 cb47e68..86a1eb0 100644 (file)
--- a/drivers/net/ethernet/renesas/ravb.h
+++ b/drivers/net/ethernet/renesas/ravb.h
@@ -993,6 +993,7 @@ struct ravb_private {
        struct platform_device *pdev;
        void __iomem *addr;
        struct clk *clk;
+       struct clk *refclk;
        struct mdiobb_ctrl mdiobb;
        u32 num_rx_ring[NUM_RX_QUEUE];
        u32 num_tx_ring[NUM_TX_QUEUE];

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index eb0c03b..1409ae9 100644 (file)
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2148,6 +2148,13 @@ static int ravb_probe(struct platform_device *pdev)
                goto out_release;
        }
 
+       priv->refclk = devm_clk_get_optional(&pdev->dev, "refclk");
+       if (IS_ERR(priv->refclk)) {
+               error = PTR_ERR(priv->refclk);
+               goto out_release;
+       }
+       clk_prepare_enable(priv->refclk);
+
        ndev->max_mtu = 2048 - (ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN);
        ndev->min_mtu = ETH_MIN_MTU;
 
@@ -2244,6 +2251,7 @@ out_dma_free:
        if (chip_id != RCAR_GEN2)
                ravb_ptp_stop(ndev);
 out_release:
+       clk_disable_unprepare(priv->refclk);
        free_netdev(ndev);
 
        pm_runtime_put(&pdev->dev);
@@ -2260,6 +2268,8 @@ static int ravb_remove(struct platform_device *pdev)
        if (priv->chip_id != RCAR_GEN2)
                ravb_ptp_stop(ndev);
 
+       clk_disable_unprepare(priv->refclk);
+
        dma_free_coherent(ndev->dev.parent, priv->desc_bat_size, priv->desc_bat,
                          priv->desc_bat_dma);
        /* Set reset mode */