Add support for Linux-PHY based CAN transceivers. Link: https://lore.kernel.org/all/20231005-at91_can-rx_offload-v2-16-9987d53600e0@xxxxxxxxxxxxxx Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> --- drivers/net/can/at91_can.c | 32 ++++++++++++++++++++++++++------ 1 file changed, 26 insertions(+), 6 deletions(-) diff --git a/drivers/net/can/at91_can.c b/drivers/net/can/at91_can.c index bfe414581fa1..94e9740c80de 100644 --- a/drivers/net/can/at91_can.c +++ b/drivers/net/can/at91_can.c @@ -16,6 +16,7 @@ #include <linux/module.h> #include <linux/netdevice.h> #include <linux/of.h> +#include <linux/phy/phy.h> #include <linux/platform_device.h> #include <linux/rtnetlink.h> #include <linux/skbuff.h> @@ -150,6 +151,7 @@ struct at91_devtype_data { struct at91_priv { struct can_priv can; /* must be the first member! */ struct napi_struct napi; + struct phy *transceiver; void __iomem *reg_base; @@ -1118,20 +1120,24 @@ static int at91_open(struct net_device *dev) struct at91_priv *priv = netdev_priv(dev); int err; - err = clk_prepare_enable(priv->clk); + err = phy_power_on(priv->transceiver); if (err) return err; /* check or determine and set bittime */ err = open_candev(dev); if (err) - goto out; + goto out_phy_power_off; + + err = clk_prepare_enable(priv->clk); + if (err) + goto out_close_candev; /* register interrupt handler */ err = request_irq(dev->irq, at91_irq, IRQF_SHARED, dev->name, dev); if (err) - goto out_close; + goto out_clock_disable_unprepare; /* start chip and queuing */ at91_chip_start(dev); @@ -1140,10 +1146,12 @@ static int at91_open(struct net_device *dev) return 0; - out_close: - close_candev(dev); - out: + out_clock_disable_unprepare: clk_disable_unprepare(priv->clk); + out_close_candev: + close_candev(dev); + out_phy_power_off: + phy_power_off(priv->transceiver); return err; } @@ -1160,6 +1168,7 @@ static int at91_close(struct net_device *dev) free_irq(dev->irq, dev); clk_disable_unprepare(priv->clk); + phy_power_off(priv->transceiver); close_candev(dev); @@ -1284,6 +1293,7 @@ static const struct at91_devtype_data *at91_can_get_driver_data(struct platform_ static int at91_can_probe(struct platform_device *pdev) { const struct at91_devtype_data *devtype_data; + struct phy *transceiver; struct net_device *dev; struct at91_priv *priv; struct resource *res; @@ -1332,6 +1342,13 @@ static int at91_can_probe(struct platform_device *pdev) goto exit_iounmap; } + transceiver = devm_phy_optional_get(&pdev->dev, NULL); + if (IS_ERR(transceiver)) { + err = PTR_ERR(transceiver); + dev_err_probe(&pdev->dev, err, "failed to get phy\n"); + goto exit_iounmap; + } + dev->netdev_ops = &at91_netdev_ops; dev->ethtool_ops = &at91_ethtool_ops; dev->irq = irq; @@ -1352,6 +1369,9 @@ static int at91_can_probe(struct platform_device *pdev) netif_napi_add_weight(dev, &priv->napi, at91_poll, get_mb_rx_num(priv)); + if (transceiver) + priv->can.bitrate_max = transceiver->attrs.max_link_rate; + if (at91_is_sam9263(priv)) dev->sysfs_groups[0] = &at91_sysfs_attr_group; -- 2.40.1
