[PATCH V3 4/5] net: ethernet: ravb: Enable optional refclk
From: Adam Ford <hidden>
Date: 2021-02-24 11:53:45
Also in:
linux-renesas-soc, lkml, netdev
Subsystem:
networking drivers, renesas ethernet avb driver, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Niklas Söderlund, Linus Torvalds
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 <redacted>
---
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 7453b17a37a2..ff363797bd2b 100644
--- a/drivers/net/ethernet/renesas/ravb.h
+++ b/drivers/net/ethernet/renesas/ravb.h@@ -994,6 +994,7 @@ 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 bd30505fbc57..614448e6eb24 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;
@@ -2260,6 +2267,9 @@ static int ravb_remove(struct platform_device *pdev) if (priv->chip_id != RCAR_GEN2) ravb_ptp_stop(ndev); + if (priv->refclk) + 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 */
--
2.25.1