netdev - [PATCH] can: dev: add transceiver capabilities to xilinx

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Date:   Mon, 17 Apr 2023 10:52:04 +0200
From:   Marcel Hellwig <git@...kiesoft.de>
To:     Appana Durga Kedareswara rao <appana.durga.rao@...inx.com>,
        Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org
Cc:     Marcel Hellwig <mhellwig@...-group.com>,
        Marcel Hellwig <git@...kiesoft.de>
Subject: [PATCH] can: dev: add transceiver capabilities to xilinx_can

Currently the xilinx_can driver does not support adding a phy like the
"ti,tcan1043" to its devicetree.

This code makes it possible to add such phy, so that the kernel makes
sure that the PHY is in operational state, when the link is set to an
"up" state.

Signed-off-by: Marcel Hellwig <git@...kiesoft.de>
---
 drivers/net/can/xilinx_can.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/net/can/xilinx_can.c b/drivers/net/can/xilinx_can.c
index 43c812ea1de0..6a5b805d579a 100644
--- a/drivers/net/can/xilinx_can.c
+++ b/drivers/net/can/xilinx_can.c
@@ -28,6 +28,7 @@
 #include <linux/types.h>
 #include <linux/can/dev.h>
 #include <linux/can/error.h>
+#include <linux/phy/phy.h>
 #include <linux/pm_runtime.h>
 
 #define DRIVER_NAME	"xilinx_can"
@@ -215,6 +216,7 @@ struct xcan_priv {
 	struct clk *bus_clk;
 	struct clk *can_clk;
 	struct xcan_devtype_data devtype;
+	struct phy *transceiver;
 };
 
 /* CAN Bittiming constants as per Xilinx CAN specs */
@@ -1419,6 +1421,12 @@ static int xcan_open(struct net_device *ndev)
 	struct xcan_priv *priv = netdev_priv(ndev);
 	int ret;
 
+	ret = phy_power_on(priv->transceiver);
+	if (ret) {
+		netdev_err(ndev, "%s: phy_power_on failed(%d)\n", __func__, ret);
+		return ret;
+	}
+
 	ret = pm_runtime_get_sync(priv->dev);
 	if (ret < 0) {
 		netdev_err(ndev, "%s: pm_runtime_get failed(%d)\n",
@@ -1461,6 +1469,7 @@ static int xcan_open(struct net_device *ndev)
 err_irq:
 	free_irq(ndev->irq, ndev);
 err:
+	phy_power_off(priv->transceiver);
 	pm_runtime_put(priv->dev);
 
 	return ret;
@@ -1482,6 +1491,7 @@ static int xcan_close(struct net_device *ndev)
 	free_irq(ndev->irq, ndev);
 	close_candev(ndev);
 
+	phy_power_off(priv->transceiver);
 	pm_runtime_put(priv->dev);
 
 	return 0;
@@ -1713,6 +1723,7 @@ static int xcan_probe(struct platform_device *pdev)
 {
 	struct net_device *ndev;
 	struct xcan_priv *priv;
+	struct phy *transceiver;
 	const struct of_device_id *of_id;
 	const struct xcan_devtype_data *devtype = &xcan_axi_data;
 	void __iomem *addr;
@@ -1843,6 +1854,14 @@ static int xcan_probe(struct platform_device *pdev)
 		goto err_free;
 	}
 
+	transceiver = devm_phy_optional_get(&pdev->dev, NULL);
+	if (IS_ERR(transceiver)) {
+		ret = PTR_ERR(transceiver);
+		dev_err_probe(&pdev->dev, ret, "failed to get phy\n");
+		goto err_free;
+	}
+	priv->transceiver = transceiver;
+
 	priv->write_reg = xcan_write_reg_le;
 	priv->read_reg = xcan_read_reg_le;
 
@@ -1869,6 +1888,7 @@ static int xcan_probe(struct platform_device *pdev)
 		goto err_disableclks;
 	}
 
+	of_can_transceiver(ndev);
 	pm_runtime_put(&pdev->dev);
 
 	if (priv->devtype.flags & XCAN_FLAG_CANFD_2) {
-- 
2.34.1