Merge tag 'linux-can-next-for-6.6-20230803' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next

Marc Kleine-Budde says:

====================
pull-request: can-next 2023-08-03

This is a pull request of 9 patches for net-next/master.

The 1st patch is by Ruan Jinjie, targets the flexcan driver, and
cleans up the error handling of platform_get_irq() in the
flexcan_probe() function.

Markus Schneider-Pargmann contributes 6 patches for the tcan4x5x M_CAN
driver, consisting of some cleanups, and adding support for the
tcan4552/4553 chips.

Another patch by Ruan Jinjie, that cleans up the error path of
platform_get_irq() in the c_can_plat_probe() function of the C_CAN
platform driver.

The last patch is by Frank Jungclaus and adds support for the
CAN-USB/3 and CAN FD to the ESD USB CAN driver.
================

Signed-off-by: David S. Miller <davem@davemloft.net>

7 files changed, 389 insertions, 62 deletions

diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c
index 925930b6c4ca..f44ba2600415 100644
--- a/drivers/net/can/c_can/c_can_platform.c
+++ b/drivers/net/can/c_can/c_can_platform.c
@@ -285,8 +285,8 @@ static int c_can_plat_probe(struct platform_device *pdev)
 
 	/* get the platform data */
 	irq = platform_get_irq(pdev, 0);
-	if (irq <= 0) {
-		ret = -ENODEV;
+	if (irq < 0) {
+		ret = irq;
 		goto exit;
 	}
 
diff --git a/drivers/net/can/flexcan/flexcan-core.c b/drivers/net/can/flexcan/flexcan-core.c
index 48273d51f271..add39e922b89 100644
--- a/drivers/net/can/flexcan/flexcan-core.c
+++ b/drivers/net/can/flexcan/flexcan-core.c
@@ -2089,8 +2089,8 @@ static int flexcan_probe(struct platform_device *pdev)
 	}
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq <= 0)
-		return -ENODEV;
+	if (irq < 0)
+		return irq;
 
 	regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(regs))
@@ -2167,13 +2167,13 @@ static int flexcan_probe(struct platform_device *pdev)
 
 	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_NR_IRQ_3) {
 		priv->irq_boff = platform_get_irq(pdev, 1);
-		if (priv->irq_boff <= 0) {
-			err = -ENODEV;
+		if (priv->irq_boff < 0) {
+			err = priv->irq_boff;
 			goto failed_platform_get_irq;
 		}
 		priv->irq_err = platform_get_irq(pdev, 2);
-		if (priv->irq_err <= 0) {
-			err = -ENODEV;
+		if (priv->irq_err < 0) {
+			err = priv->irq_err;
 			goto failed_platform_get_irq;
 		}
 	}
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index d204703521d2..16ecc11c7f62 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -1913,6 +1913,22 @@ static int register_m_can_dev(struct net_device *dev)
 	return register_candev(dev);
 }
 
+int m_can_check_mram_cfg(struct m_can_classdev *cdev, u32 mram_max_size)
+{
+	u32 total_size;
+
+	total_size = cdev->mcfg[MRAM_TXB].off - cdev->mcfg[MRAM_SIDF].off +
+			cdev->mcfg[MRAM_TXB].num * TXB_ELEMENT_SIZE;
+	if (total_size > mram_max_size) {
+		dev_err(cdev->dev, "Total size of mram config(%u) exceeds mram(%u)\n",
+			total_size, mram_max_size);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(m_can_check_mram_cfg);
+
 static void m_can_of_parse_mram(struct m_can_classdev *cdev,
 				const u32 *mram_config_vals)
 {
diff --git a/drivers/net/can/m_can/m_can.h b/drivers/net/can/m_can/m_can.h
index c543928c756f..520e14277dff 100644
--- a/drivers/net/can/m_can/m_can.h
+++ b/drivers/net/can/m_can/m_can.h
@@ -103,6 +103,7 @@ int m_can_class_register(struct m_can_classdev *cdev);
 void m_can_class_unregister(struct m_can_classdev *cdev);
 int m_can_class_get_clocks(struct m_can_classdev *cdev);
 int m_can_init_ram(struct m_can_classdev *priv);
+int m_can_check_mram_cfg(struct m_can_classdev *cdev, u32 mram_max_size);
 
 int m_can_class_suspend(struct device *dev);
 int m_can_class_resume(struct device *dev);
diff --git a/drivers/net/can/m_can/tcan4x5x-core.c b/drivers/net/can/m_can/tcan4x5x-core.c
index 2342aa011647..8a4143809d33 100644
--- a/drivers/net/can/m_can/tcan4x5x-core.c
+++ b/drivers/net/can/m_can/tcan4x5x-core.c
@@ -6,8 +6,9 @@
 
 #define TCAN4X5X_EXT_CLK_DEF 40000000
 
-#define TCAN4X5X_DEV_ID0 0x00
-#define TCAN4X5X_DEV_ID1 0x04
+#define TCAN4X5X_DEV_ID1 0x00
+#define TCAN4X5X_DEV_ID1_TCAN 0x4e414354 /* ASCII TCAN */
+#define TCAN4X5X_DEV_ID2 0x04
 #define TCAN4X5X_REV 0x08
 #define TCAN4X5X_STATUS 0x0C
 #define TCAN4X5X_ERROR_STATUS_MASK 0x10
@@ -80,6 +81,7 @@
 	 TCAN4X5X_MCAN_IR_RF1F)
 
 #define TCAN4X5X_MRAM_START 0x8000
+#define TCAN4X5X_MRAM_SIZE 0x800
 #define TCAN4X5X_MCAN_OFFSET 0x1000
 
 #define TCAN4X5X_CLEAR_ALL_INT 0xffffffff
@@ -102,6 +104,37 @@
 #define TCAN4X5X_WD_3_S_TIMER BIT(29)
 #define TCAN4X5X_WD_6_S_TIMER (BIT(28) | BIT(29))
 
+struct tcan4x5x_version_info {
+	const char *name;
+	u32 id2_register;
+
+	bool has_wake_pin;
+	bool has_state_pin;
+};
+
+enum {
+	TCAN4552 = 0,
+	TCAN4553,
+	TCAN4X5X,
+};
+
+static const struct tcan4x5x_version_info tcan4x5x_versions[] = {
+	[TCAN4552] = {
+		.name = "4552",
+		.id2_register = 0x32353534,
+	},
+	[TCAN4553] = {
+		.name = "4553",
+		.id2_register = 0x32353534,
+	},
+	/* generic version with no id2_register at the end */
+	[TCAN4X5X] = {
+		.name = "generic",
+		.has_wake_pin = true,
+		.has_state_pin = true,
+	},
+};
+
 static inline struct tcan4x5x_priv *cdev_to_priv(struct m_can_classdev *cdev)
 {
 	return container_of(cdev, struct tcan4x5x_priv, cdev);
@@ -253,18 +286,53 @@ static int tcan4x5x_disable_state(struct m_can_classdev *cdev)
 				  TCAN4X5X_DISABLE_INH_MSK, 0x01);
 }
 
-static int tcan4x5x_get_gpios(struct m_can_classdev *cdev)
+static const struct tcan4x5x_version_info
+*tcan4x5x_find_version(struct tcan4x5x_priv *priv)
+{
+	u32 val;
+	int ret;
+
+	ret = regmap_read(priv->regmap, TCAN4X5X_DEV_ID1, &val);
+	if (ret)
+		return ERR_PTR(ret);
+
+	if (val != TCAN4X5X_DEV_ID1_TCAN) {
+		dev_err(&priv->spi->dev, "Not a tcan device %x\n", val);
+		return ERR_PTR(-ENODEV);
+	}
+
+	ret = regmap_read(priv->regmap, TCAN4X5X_DEV_ID2, &val);
+	if (ret)
+		return ERR_PTR(ret);
+
+	for (int i = 0; i != ARRAY_SIZE(tcan4x5x_versions); ++i) {
+		const struct tcan4x5x_version_info *vinfo = &tcan4x5x_versions[i];
+
+		if (!vinfo->id2_register || val == vinfo->id2_register) {
+			dev_info(&priv->spi->dev, "Detected TCAN device version %s\n",
+				 vinfo->name);
+			return vinfo;
+		}
+	}
+
+	return &tcan4x5x_versions[TCAN4X5X];
+}
+
+static int tcan4x5x_get_gpios(struct m_can_classdev *cdev,
+			      const struct tcan4x5x_version_info *version_info)
 {
 	struct tcan4x5x_priv *tcan4x5x = cdev_to_priv(cdev);
 	int ret;
 
-	tcan4x5x->device_wake_gpio = devm_gpiod_get(cdev->dev, "device-wake",
-						    GPIOD_OUT_HIGH);
-	if (IS_ERR(tcan4x5x->device_wake_gpio)) {
-		if (PTR_ERR(tcan4x5x->device_wake_gpio) == -EPROBE_DEFER)
-			return -EPROBE_DEFER;
+	if (version_info->has_wake_pin) {
+		tcan4x5x->device_wake_gpio = devm_gpiod_get(cdev->dev, "device-wake",
+							    GPIOD_OUT_HIGH);
+		if (IS_ERR(tcan4x5x->device_wake_gpio)) {
+			if (PTR_ERR(tcan4x5x->device_wake_gpio) == -EPROBE_DEFER)
+				return -EPROBE_DEFER;
 
-		tcan4x5x_disable_wake(cdev);
+			tcan4x5x_disable_wake(cdev);
+		}
 	}
 
 	tcan4x5x->reset_gpio = devm_gpiod_get_optional(cdev->dev, "reset",
@@ -276,12 +344,14 @@ static int tcan4x5x_get_gpios(struct m_can_classdev *cdev)
 	if (ret)
 		return ret;
 
-	tcan4x5x->device_state_gpio = devm_gpiod_get_optional(cdev->dev,
-							      "device-state",
-							      GPIOD_IN);
-	if (IS_ERR(tcan4x5x->device_state_gpio)) {
-		tcan4x5x->device_state_gpio = NULL;
-		tcan4x5x_disable_state(cdev);
+	if (version_info->has_state_pin) {
+		tcan4x5x->device_state_gpio = devm_gpiod_get_optional(cdev->dev,
+								      "device-state",
+								      GPIOD_IN);
+		if (IS_ERR(tcan4x5x->device_state_gpio)) {
+			tcan4x5x->device_state_gpio = NULL;
+			tcan4x5x_disable_state(cdev);
+		}
 	}
 
 	return 0;
@@ -298,6 +368,7 @@ static struct m_can_ops tcan4x5x_ops = {
 
 static int tcan4x5x_can_probe(struct spi_device *spi)
 {
+	const struct tcan4x5x_version_info *version_info;
 	struct tcan4x5x_priv *priv;
 	struct m_can_classdev *mcan_class;
 	int freq, ret;
@@ -307,6 +378,10 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
 	if (!mcan_class)
 		return -ENOMEM;
 
+	ret = m_can_check_mram_cfg(mcan_class, TCAN4X5X_MRAM_SIZE);
+	if (ret)
+		goto out_m_can_class_free_dev;
+
 	priv = cdev_to_priv(mcan_class);
 
 	priv->power = devm_regulator_get_optional(&spi->dev, "vsup");
@@ -327,6 +402,8 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
 
 	/* Sanity check */
 	if (freq < 20000000 || freq > TCAN4X5X_EXT_CLK_DEF) {
+		dev_err(&spi->dev, "Clock frequency is out of supported range %d\n",
+			freq);
 		ret = -ERANGE;
 		goto out_m_can_class_free_dev;
 	}
@@ -345,28 +422,49 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
 	/* Configure the SPI bus */
 	spi->bits_per_word = 8;
 	ret = spi_setup(spi);
-	if (ret)
+	if (ret) {
+		dev_err(&spi->dev, "SPI setup failed %pe\n", ERR_PTR(ret));
 		goto out_m_can_class_free_dev;
+	}
 
 	ret = tcan4x5x_regmap_init(priv);
-	if (ret)
+	if (ret) {
+		dev_err(&spi->dev, "regmap init failed %pe\n", ERR_PTR(ret));
 		goto out_m_can_class_free_dev;
+	}
 
 	ret = tcan4x5x_power_enable(priv->power, 1);
-	if (ret)
+	if (ret) {
+		dev_err(&spi->dev, "Enabling regulator failed %pe\n",
+			ERR_PTR(ret));
 		goto out_m_can_class_free_dev;
+	}
 
-	ret = tcan4x5x_get_gpios(mcan_class);
-	if (ret)
+	version_info = tcan4x5x_find_version(priv);
+	if (IS_ERR(version_info)) {
+		ret = PTR_ERR(version_info);
+		goto out_power;
+	}
+
+	ret = tcan4x5x_get_gpios(mcan_class, version_info);
+	if (ret) {
+		dev_err(&spi->dev, "Getting gpios failed %pe\n", ERR_PTR(ret));
 		goto out_power;
+	}
 
 	ret = tcan4x5x_init(mcan_class);
-	if (ret)
+	if (ret) {
+		dev_err(&spi->dev, "tcan initialization failed %pe\n",
+			ERR_PTR(ret));
 		goto out_power;
+	}
 
 	ret = m_can_class_register(mcan_class);
-	if (ret)
+	if (ret) {
+		dev_err(&spi->dev, "Failed registering m_can device %pe\n",
+			ERR_PTR(ret));
 		goto out_power;
+	}
 
 	netdev_info(mcan_class->net, "TCAN4X5X successfully initialized.\n");
 	return 0;
diff --git a/drivers/net/can/m_can/tcan4x5x-regmap.c b/drivers/net/can/m_can/tcan4x5x-regmap.c
index 2b218ce04e9f..fafa6daa67e6 100644
--- a/drivers/net/can/m_can/tcan4x5x-regmap.c
+++ b/drivers/net/can/m_can/tcan4x5x-regmap.c
@@ -95,7 +95,6 @@ static const struct regmap_range tcan4x5x_reg_table_wr_range[] = {
 	regmap_reg_range(0x000c, 0x0010),
 	/* Device configuration registers and Interrupt Flags*/
 	regmap_reg_range(0x0800, 0x080c),
-	regmap_reg_range(0x0814, 0x0814),
 	regmap_reg_range(0x0820, 0x0820),
 	regmap_reg_range(0x0830, 0x0830),
 	/* M_CAN */
diff --git a/drivers/net/can/usb/esd_usb.c b/drivers/net/can/usb/esd_usb.c
index 6201637ac0ff..41a0e4261d15 100644
--- a/drivers/net/can/usb/esd_usb.c
+++ b/drivers/net/can/usb/esd_usb.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * CAN driver for esd electronics gmbh CAN-USB/2 and CAN-USB/Micro
+ * CAN driver for esd electronics gmbh CAN-USB/2, CAN-USB/3 and CAN-USB/Micro
  *
  * Copyright (C) 2010-2012 esd electronic system design gmbh, Matthias Fuchs <socketcan@esd.eu>
  * Copyright (C) 2022-2023 esd electronics gmbh, Frank Jungclaus <frank.jungclaus@esd.eu>
@@ -19,17 +19,19 @@
 
 MODULE_AUTHOR("Matthias Fuchs <socketcan@esd.eu>");
 MODULE_AUTHOR("Frank Jungclaus <frank.jungclaus@esd.eu>");
-MODULE_DESCRIPTION("CAN driver for esd electronics gmbh CAN-USB/2 and CAN-USB/Micro interfaces");
+MODULE_DESCRIPTION("CAN driver for esd electronics gmbh CAN-USB/2, CAN-USB/3 and CAN-USB/Micro interfaces");
 MODULE_LICENSE("GPL v2");
 
 /* USB vendor and product ID */
 #define ESD_USB_ESDGMBH_VENDOR_ID	0x0ab4
 #define ESD_USB_CANUSB2_PRODUCT_ID	0x0010
 #define ESD_USB_CANUSBM_PRODUCT_ID	0x0011
+#define ESD_USB_CANUSB3_PRODUCT_ID	0x0014
 
 /* CAN controller clock frequencies */
 #define ESD_USB_2_CAN_CLOCK	(60 * MEGA) /* Hz */
 #define ESD_USB_M_CAN_CLOCK	(36 * MEGA) /* Hz */
+#define ESD_USB_3_CAN_CLOCK	(80 * MEGA) /* Hz */
 
 /* Maximum number of CAN nets */
 #define ESD_USB_MAX_NETS	2
@@ -44,6 +46,9 @@ MODULE_LICENSE("GPL v2");
 
 /* esd CAN message flags - dlc field */
 #define ESD_USB_RTR	BIT(4)
+#define ESD_USB_NO_BRS	BIT(4)
+#define ESD_USB_ESI	BIT(5)
+#define ESD_USB_FD	BIT(7)
 
 /* esd CAN message flags - id field */
 #define ESD_USB_EXTID	BIT(29)
@@ -65,6 +70,9 @@ MODULE_LICENSE("GPL v2");
 #define ESD_USB_M_SJW_SHIFT	24
 #define ESD_USB_TRIPLE_SAMPLES	BIT(23)
 
+/* Transmitter Delay Compensation */
+#define ESD_USB_3_TDC_MODE_AUTO	0
+
 /* esd IDADD message */
 #define ESD_USB_ID_ENABLE	BIT(7)
 #define ESD_USB_MAX_ID_SEGMENT	64
@@ -88,6 +96,21 @@ MODULE_LICENSE("GPL v2");
 #define ESD_USB_MAX_RX_URBS		4
 #define ESD_USB_MAX_TX_URBS		16 /* must be power of 2 */
 
+/* Modes for CAN-USB/3, to be used for esd_usb_3_set_baudrate_msg_x.mode */
+#define ESD_USB_3_BAUDRATE_MODE_DISABLE		0 /* remove from bus */
+#define ESD_USB_3_BAUDRATE_MODE_INDEX		1 /* ESD (CiA) bit rate idx */
+#define ESD_USB_3_BAUDRATE_MODE_BTR_CTRL	2 /* BTR values (controller)*/
+#define ESD_USB_3_BAUDRATE_MODE_BTR_CANONICAL	3 /* BTR values (canonical) */
+#define ESD_USB_3_BAUDRATE_MODE_NUM		4 /* numerical bit rate */
+#define ESD_USB_3_BAUDRATE_MODE_AUTOBAUD	5 /* autobaud */
+
+/* Flags for CAN-USB/3, to be used for esd_usb_3_set_baudrate_msg_x.flags */
+#define ESD_USB_3_BAUDRATE_FLAG_FD	BIT(0) /* enable CAN FD mode */
+#define ESD_USB_3_BAUDRATE_FLAG_LOM	BIT(1) /* enable listen only mode */
+#define ESD_USB_3_BAUDRATE_FLAG_STM	BIT(2) /* enable self test mode */
+#define ESD_USB_3_BAUDRATE_FLAG_TRS	BIT(3) /* enable triple sampling */
+#define ESD_USB_3_BAUDRATE_FLAG_TXP	BIT(4) /* enable transmit pause */
+
 struct esd_usb_header_msg {
 	u8 len; /* total message length in 32bit words */
 	u8 cmd;
@@ -122,6 +145,7 @@ struct esd_usb_rx_msg {
 	__le32 id; /* upper 3 bits contain flags */
 	union {
 		u8 data[CAN_MAX_DLEN];
+		u8 data_fd[CANFD_MAX_DLEN];
 		struct {
 			u8 status; /* CAN Controller Status */
 			u8 ecc;    /* Error Capture Register */
@@ -138,7 +162,10 @@ struct esd_usb_tx_msg {
 	u8 dlc;
 	u32 hnd;	/* opaque handle, not used by device */
 	__le32 id; /* upper 3 bits contain flags */
-	u8 data[CAN_MAX_DLEN];
+	union {
+		u8 data[CAN_MAX_DLEN];
+		u8 data_fd[CANFD_MAX_DLEN];
+	};
 };
 
 struct esd_usb_tx_done_msg {
@@ -166,6 +193,50 @@ struct esd_usb_set_baudrate_msg {
 	__le32 baud;
 };
 
+/* CAN-USB/3 baudrate configuration, used for nominal as well as for data bit rate */
+struct esd_usb_3_baudrate_cfg {
+	__le16 brp;	/* bit rate pre-scaler */
+	__le16 tseg1;	/* time segment before sample point */
+	__le16 tseg2;	/* time segment after sample point */
+	__le16 sjw;	/* synchronization jump Width */
+};
+
+/* In principle, the esd CAN-USB/3 supports Transmitter Delay Compensation (TDC),
+ * but currently only the automatic TDC mode is supported by this driver.
+ * An implementation for manual TDC configuration will follow.
+ *
+ * For information about struct esd_usb_3_tdc_cfg, see
+ * NTCAN Application Developers Manual, 6.2.25 NTCAN_TDC_CFG + related chapters
+ * https://esd.eu/fileadmin/esd/docs/manuals/NTCAN_Part1_Function_API_Manual_en_56.pdf
+ */
+struct esd_usb_3_tdc_cfg {
+	u8 tdc_mode;	/* transmitter delay compensation mode  */
+	u8 ssp_offset;	/* secondary sample point offset in mtq */
+	s8 ssp_shift;	/* secondary sample point shift in mtq */
+	u8 tdc_filter;	/* TDC filter in mtq */
+};
+
+/* Extended version of the above set_baudrate_msg for a CAN-USB/3
+ * to define the CAN bit timing configuration of the CAN controller in
+ * CAN FD mode as well as in Classical CAN mode.
+ *
+ * The payload of this command is a NTCAN_BAUDRATE_X structure according to
+ * esd electronics gmbh, NTCAN Application Developers Manual, 6.2.15 NTCAN_BAUDRATE_X
+ * https://esd.eu/fileadmin/esd/docs/manuals/NTCAN_Part1_Function_API_Manual_en_56.pdf
+ */
+struct esd_usb_3_set_baudrate_msg_x {
+	u8 len;	/* total message length in 32bit words */
+	u8 cmd;
+	u8 net;
+	u8 rsvd;	/*reserved */
+	/* Payload ... */
+	__le16 mode;	/* mode word, see ESD_USB_3_BAUDRATE_MODE_xxx */
+	__le16 flags;	/* control flags, see ESD_USB_3_BAUDRATE_FLAG_xxx */
+	struct esd_usb_3_tdc_cfg tdc;	/* TDC configuration */
+	struct esd_usb_3_baudrate_cfg nom;	/* nominal bit rate */
+	struct esd_usb_3_baudrate_cfg data;	/* data bit rate */
+};
+
 /* Main message type used between library and application */
 union __packed esd_usb_msg {
 	struct esd_usb_header_msg hdr;
@@ -175,12 +246,14 @@ union __packed esd_usb_msg {
 	struct esd_usb_tx_msg tx;
 	struct esd_usb_tx_done_msg txdone;
 	struct esd_usb_set_baudrate_msg setbaud;
+	struct esd_usb_3_set_baudrate_msg_x setbaud_x;
 	struct esd_usb_id_filter_msg filter;
 };
 
 static struct usb_device_id esd_usb_table[] = {
 	{USB_DEVICE(ESD_USB_ESDGMBH_VENDOR_ID, ESD_USB_CANUSB2_PRODUCT_ID)},
 	{USB_DEVICE(ESD_USB_ESDGMBH_VENDOR_ID, ESD_USB_CANUSBM_PRODUCT_ID)},
+	{USB_DEVICE(ESD_USB_ESDGMBH_VENDOR_ID, ESD_USB_CANUSB3_PRODUCT_ID)},
 	{}
 };
 MODULE_DEVICE_TABLE(usb, esd_usb_table);
@@ -321,9 +394,10 @@ static void esd_usb_rx_can_msg(struct esd_usb_net_priv *priv,
 {
 	struct net_device_stats *stats = &priv->netdev->stats;
 	struct can_frame *cf;
+	struct canfd_frame *cfd;
 	struct sk_buff *skb;
-	int i;
 	u32 id;
+	u8 len;
 
 	if (!netif_device_present(priv->netdev))
 		return;
@@ -333,27 +407,42 @@ static void esd_usb_rx_can_msg(struct esd_usb_net_priv *priv,
 	if (id & ESD_USB_EVENT) {
 		esd_usb_rx_event(priv, msg);
 	} else {
-		skb = alloc_can_skb(priv->netdev, &cf);
+		if (msg->rx.dlc & ESD_USB_FD) {
+			skb = alloc_canfd_skb(priv->netdev, &cfd);
+		} else {
+			skb = alloc_can_skb(priv->netdev, &cf);
+			cfd = (struct canfd_frame *)cf;
+		}
+
 		if (skb == NULL) {
 			stats->rx_dropped++;
 			return;
 		}
 
-		cf->can_id = id & ESD_USB_IDMASK;
-		can_frame_set_cc_len(cf, msg->rx.dlc & ~ESD_USB_RTR,
-				     priv->can.ctrlmode);
-
-		if (id & ESD_USB_EXTID)
-			cf->can_id |= CAN_EFF_FLAG;
+		cfd->can_id = id & ESD_USB_IDMASK;
 
-		if (msg->rx.dlc & ESD_USB_RTR) {
-			cf->can_id |= CAN_RTR_FLAG;
+		if (msg->rx.dlc & ESD_USB_FD) {
+			/* masking by 0x0F is already done within can_fd_dlc2len() */
+			cfd->len = can_fd_dlc2len(msg->rx.dlc);
+			len = cfd->len;
+			if ((msg->rx.dlc & ESD_USB_NO_BRS) == 0)
+				cfd->flags |= CANFD_BRS;
+			if (msg->rx.dlc & ESD_USB_ESI)
+				cfd->flags |= CANFD_ESI;
 		} else {
-			for (i = 0; i < cf->len; i++)
-				cf->data[i] = msg->rx.data[i];
-
-			stats->rx_bytes += cf->len;
+			can_frame_set_cc_len(cf, msg->rx.dlc & ~ESD_USB_RTR, priv->can.ctrlmode);
+			len = cf->len;
+			if (msg->rx.dlc & ESD_USB_RTR) {
+				cf->can_id |= CAN_RTR_FLAG;
+				len = 0;
+			}
 		}
+
+		if (id & ESD_USB_EXTID)
+			cfd->can_id |= CAN_EFF_FLAG;
+
+		memcpy(cfd->data, msg->rx.data_fd, len);
+		stats->rx_bytes += len;
 		stats->rx_packets++;
 
 		netif_rx(skb);
@@ -728,7 +817,7 @@ static netdev_tx_t esd_usb_start_xmit(struct sk_buff *skb,
 	struct esd_usb *dev = priv->usb;
 	struct esd_tx_urb_context *context = NULL;
 	struct net_device_stats *stats = &netdev->stats;
-	struct can_frame *cf = (struct can_frame *)skb->data;
+	struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
 	union esd_usb_msg *msg;
 	struct urb *urb;
 	u8 *buf;
@@ -762,20 +851,29 @@ static netdev_tx_t esd_usb_start_xmit(struct sk_buff *skb,
 	msg->hdr.len = offsetof(struct esd_usb_tx_msg, data) / sizeof(u32);
 	msg->hdr.cmd = ESD_USB_CMD_CAN_TX;
 	msg->tx.net = priv->index;
-	msg->tx.dlc = can_get_cc_dlc(cf, priv->can.ctrlmode);
-	msg->tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK);
 
-	if (cf->can_id & CAN_RTR_FLAG)
-		msg->tx.dlc |= ESD_USB_RTR;
+	if (can_is_canfd_skb(skb)) {
+		msg->tx.dlc = can_fd_len2dlc(cfd->len);
+		msg->tx.dlc |= ESD_USB_FD;
+
+		if ((cfd->flags & CANFD_BRS) == 0)
+			msg->tx.dlc |= ESD_USB_NO_BRS;
+	} else {
+		msg->tx.dlc = can_get_cc_dlc((struct can_frame *)cfd, priv->can.ctrlmode);
+
+		if (cfd->can_id & CAN_RTR_FLAG)
+			msg->tx.dlc |= ESD_USB_RTR;
+	}
+
+	msg->tx.id = cpu_to_le32(cfd->can_id & CAN_ERR_MASK);
 
-	if (cf->can_id & CAN_EFF_FLAG)
+	if (cfd->can_id & CAN_EFF_FLAG)
 		msg->tx.id |= cpu_to_le32(ESD_USB_EXTID);
 
-	for (i = 0; i < cf->len; i++)
-		msg->tx.data[i] = cf->data[i];
+	memcpy(msg->tx.data_fd, cfd->data, cfd->len);
 
 	/* round up, then divide by 4 to add the payload length as # of 32bit words */
-	msg->hdr.len += DIV_ROUND_UP(cf->len, sizeof(u32));
+	msg->hdr.len += DIV_ROUND_UP(cfd->len, sizeof(u32));
 
 	for (i = 0; i < ESD_USB_MAX_TX_URBS; i++) {
 		if (priv->tx_contexts[i].echo_index == ESD_USB_MAX_TX_URBS) {
@@ -962,6 +1060,105 @@ static int esd_usb_2_set_bittiming(struct net_device *netdev)
 	return err;
 }
 
+/* Nominal bittiming constants, see
+ * Microchip SAM E70/S70/V70/V71, Data Sheet, Rev. G - 07/2022
+ * 48.6.8 MCAN Nominal Bit Timing and Prescaler Register
+ */
+static const struct can_bittiming_const esd_usb_3_nom_bittiming_const = {
+	.name = "esd_usb_3",
+	.tseg1_min = 2,
+	.tseg1_max = 256,
+	.tseg2_min = 2,
+	.tseg2_max = 128,
+	.sjw_max = 128,
+	.brp_min = 1,
+	.brp_max = 512,
+	.brp_inc = 1,
+};
+
+/* Data bittiming constants, see
+ * Microchip SAM E70/S70/V70/V71, Data Sheet, Rev. G - 07/2022
+ * 48.6.4 MCAN Data Bit Timing and Prescaler Register
+ */
+static const struct can_bittiming_const esd_usb_3_data_bittiming_const = {
+	.name = "esd_usb_3",
+	.tseg1_min = 2,
+	.tseg1_max = 32,
+	.tseg2_min = 1,
+	.tseg2_max = 16,
+	.sjw_max = 8,
+	.brp_min = 1,
+	.brp_max = 32,
+	.brp_inc = 1,
+};
+
+static int esd_usb_3_set_bittiming(struct net_device *netdev)
+{
+	const struct can_bittiming_const *nom_btc = &esd_usb_3_nom_bittiming_const;
+	const struct can_bittiming_const *data_btc = &esd_usb_3_data_bittiming_const;
+	struct esd_usb_net_priv *priv = netdev_priv(netdev);
+	struct can_bittiming *nom_bt = &priv->can.bittiming;
+	struct can_bittiming *data_bt = &priv->can.data_bittiming;
+	struct esd_usb_3_set_baudrate_msg_x *baud_x;
+	union esd_usb_msg *msg;
+	u16 flags = 0;
+	int err;
+
+	msg = kmalloc(sizeof(*msg), GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	baud_x = &msg->setbaud_x;
+
+	/* Canonical is the most reasonable mode for SocketCAN on CAN-USB/3 ... */
+	baud_x->mode = cpu_to_le16(ESD_USB_3_BAUDRATE_MODE_BTR_CANONICAL);
+
+	if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
+		flags |= ESD_USB_3_BAUDRATE_FLAG_LOM;
+
+	if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
+		flags |= ESD_USB_3_BAUDRATE_FLAG_TRS;
+
+	baud_x->nom.brp = cpu_to_le16(nom_bt->brp & (nom_btc->brp_max - 1));
+	baud_x->nom.sjw = cpu_to_le16(nom_bt->sjw & (nom_btc->sjw_max - 1));
+	baud_x->nom.tseg1 = cpu_to_le16((nom_bt->prop_seg + nom_bt->phase_seg1)
+					& (nom_btc->tseg1_max - 1));
+	baud_x->nom.tseg2 = cpu_to_le16(nom_bt->phase_seg2 & (nom_btc->tseg2_max - 1));
+
+	if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
+		baud_x->data.brp = cpu_to_le16(data_bt->brp & (data_btc->brp_max - 1));
+		baud_x->data.sjw = cpu_to_le16(data_bt->sjw & (data_btc->sjw_max - 1));
+		baud_x->data.tseg1 = cpu_to_le16((data_bt->prop_seg + data_bt->phase_seg1)
+						 & (data_btc->tseg1_max - 1));
+		baud_x->data.tseg2 = cpu_to_le16(data_bt->phase_seg2 & (data_btc->tseg2_max - 1));
+		flags |= ESD_USB_3_BAUDRATE_FLAG_FD;
+	}
+
+	/* Currently this driver only supports the automatic TDC mode */
+	baud_x->tdc.tdc_mode = ESD_USB_3_TDC_MODE_AUTO;
+	baud_x->tdc.ssp_offset = 0;
+	baud_x->tdc.ssp_shift = 0;
+	baud_x->tdc.tdc_filter = 0;
+
+	baud_x->flags = cpu_to_le16(flags);
+	baud_x->net = priv->index;
+	baud_x->rsvd = 0;
+
+	/* set len as # of 32bit words */
+	msg->hdr.len = sizeof(struct esd_usb_3_set_baudrate_msg_x) / sizeof(u32);
+	msg->hdr.cmd = ESD_USB_CMD_SETBAUD;
+
+	netdev_dbg(netdev,
+		   "ctrlmode=%#x/%#x, esd-net=%u, esd-mode=%#x, esd-flags=%#x\n",
+		   priv->can.ctrlmode, priv->can.ctrlmode_supported,
+		   priv->index, le16_to_cpu(baud_x->mode), flags);
+
+	err = esd_usb_send_msg(priv->usb, msg);
+
+	kfree(msg);
+	return err;
+}
+
 static int esd_usb_get_berr_counter(const struct net_device *netdev,
 				    struct can_berr_counter *bec)
 {
@@ -1019,16 +1216,32 @@ static int esd_usb_probe_one_net(struct usb_interface *intf, int index)
 		CAN_CTRLMODE_CC_LEN8_DLC |
 		CAN_CTRLMODE_BERR_REPORTING;
 
-	if (le16_to_cpu(dev->udev->descriptor.idProduct) ==
-	    ESD_USB_CANUSBM_PRODUCT_ID)
+	switch (le16_to_cpu(dev->udev->descriptor.idProduct)) {
+	case ESD_USB_CANUSB3_PRODUCT_ID:
+		priv->can.clock.freq = ESD_USB_3_CAN_CLOCK;
+		priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
+		priv->can.ctrlmode_supported |= CAN_CTRLMODE_FD;
+		priv->can.bittiming_const = &esd_usb_3_nom_bittiming_const;
+		priv->can.data_bittiming_const = &esd_usb_3_data_bittiming_const;
+		priv->can.do_set_bittiming = esd_usb_3_set_bittiming;
+		priv->can.do_set_data_bittiming = esd_usb_3_set_bittiming;
+		break;
+
+	case ESD_USB_CANUSBM_PRODUCT_ID:
 		priv->can.clock.freq = ESD_USB_M_CAN_CLOCK;
-	else {
+		priv->can.bittiming_const = &esd_usb_2_bittiming_const;
+		priv->can.do_set_bittiming = esd_usb_2_set_bittiming;
+		break;
+
+	case ESD_USB_CANUSB2_PRODUCT_ID:
+	default:
 		priv->can.clock.freq = ESD_USB_2_CAN_CLOCK;
 		priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
+		priv->can.bittiming_const = &esd_usb_2_bittiming_const;
+		priv->can.do_set_bittiming = esd_usb_2_set_bittiming;
+		break;
 	}
 
-	priv->can.bittiming_const = &esd_usb_2_bittiming_const;
-	priv->can.do_set_bittiming = esd_usb_2_set_bittiming;
 	priv->can.do_set_mode = esd_usb_set_mode;
 	priv->can.do_get_berr_counter = esd_usb_get_berr_counter;