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 <aford...@gmail.com>
Reviewed-by: Andrew Lunn <and...@lunn.ch>
---
V4: Eliminate the NULL check when disabling refclk, and add a line
to disable the refclk if there is a failure after it's been
initialized.
V3: Change 'avb' to 'AVB'
Remove unnessary else statement and pointer maniupluation when
enabling the refclock.
Add disable_unprepare call in remove funtion.
V2: The previous patch to fetch the fclk was dropped. In its place
is code to enable the refclk
diff --git a/drivers/net/ethernet/renesas/ravb.h
b/drivers/net/ethernet/renesas/ravb.h
index cb47e68c1a3e..86a1eb0634e8 100644
--- 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 eb0c03bdb12d..1409ae986aa2 100644
--- 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 @@ static int ravb_probe(struct platform_device *pdev)
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 */
--
2.17.1
