linux-can-next-for-6.19-20251017

-----BEGIN PGP SIGNATURE----- iQFHBAABCgAxFiEEn/sM2K9nqF/8FWzzDHRl3/mQkZwFAmjyWiQTHG1rbEBwZW5n dXRyb25peC5kZQAKCRAMdGXf+ZCRnDm6CACW1LjNTfKAFEytuGK/LnR38bIaZI6V nIHxzQSHlZs8tN9AWJR3ucF7so7FK07eiWBpVP5HXnEBkrC+8EUPsCXWGOkQBVcC s8BCdRLJfl+OnSFtSNk2LqTLpmN3o1rly7HrdJEyZyqKsoX0bLQmF/dGQIgn5JI+ 2v9ibQSuj0fOQCKR9vyPf3UflJmrsFqJqsHfsbq/2Ld28mGuaqX0+LxSbdFVosnh KxL1S8jK8j8vD+FN5eMWI0KkehztMIQHfNVLgcr+neyqjqiX1qIqNjm8enQanMI4 pGzroH7OdYQ8/a0DBmYG4lmDRMQ46T/PurgA0H9TgGaxoesTV0NhkADb =Bu+P -----END PGP SIGNATURE----- Merge tag 'linux-can-next-for-6.19-20251017' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next Marc Kleine-Budde says: ==================== pull-request: can-next 2025-10-17 The first patch is by me and adds support for an optional reset to the m_can drivers. Vincent Mailhol's patch targets all drivers and removes the can_change_mtu() function, since the netdev's min and max MTU are populated. Markus Schneider-Pargmann contributes 4 patches to the m_can driver to add am62 wakeup support. The last 7 patches are by me and provide various cleanups to the m_can driver. * tag 'linux-can-next-for-6.19-20251017' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next: can: m_can: m_can_get_berr_counter(): don't wake up controller if interface is down can: m_can: m_can_tx_submit(): remove unneeded sanity checks can: m_can: m_can_class_register(): remove error message in case devm_kzalloc() fails can: m_can: m_can_interrupt_enable(): use m_can_write() instead of open coding it net: m_can: convert dev_{dbg,info,err} -> netdev_{dbg,info,err} can: m_can: hrtimer_callback(): rename to m_can_polling_timer() can: m_can: m_can_init_ram(): make static can: m_can: Support pinctrl wakeup state can: m_can: Return ERR_PTR on error in allocation can: m_can: Map WoL to device_set_wakeup_enable dt-bindings: can: m_can: Add wakeup properties can: treewide: remove can_change_mtu() can: m_can: add support for optional reset ==================== Link: https://patch.msgid.link/20251017150819.1415685-1-mkl@pengutronix.de Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-03-08 04:04:43 +01:00 · 2025-10-20 18:36:17 -07:00 · 2025-10-20 18:36:17 -07:00 · ebc742edc9
commit ebc742edc9
parent 38516e3fa4 e41287a079
45 changed files with 222 additions and 152 deletions
--- a/Documentation/devicetree/bindings/net/can/bosch,m_can.yaml
+++ b/Documentation/devicetree/bindings/net/can/bosch,m_can.yaml
@ -109,6 +109,26 @@ properties:
        maximum: 32
    minItems: 1

+  pinctrl-0:
+    description: Default pinctrl state
+
+  pinctrl-1:
+    description: Can be "sleep" or "wakeup" pinctrl state
+
+  pinctrl-2:
+    description: Can be "sleep" or "wakeup" pinctrl state
+
+  pinctrl-names:
+    description:
+      When present should contain at least "default" describing the default pin
+      states. Other states are "sleep" which describes the pinstate when
+      sleeping and "wakeup" describing the pins if wakeup is enabled.
+    minItems: 1
+    items:
+      - const: default
+      - enum: [ sleep, wakeup ]
+      - const: wakeup
+
  power-domains:
    description:
      Power domain provider node and an args specifier containing
@ -125,6 +145,11 @@ properties:
    minItems: 1
    maxItems: 2

+  wakeup-source:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description:
+      List of phandles to system idle states in which mcan can wakeup the system.
+
 required:
  - compatible
  - reg
--- a/drivers/net/can/at91_can.c
+++ b/drivers/net/can/at91_can.c
@ -948,7 +948,6 @@ static const struct net_device_ops at91_netdev_ops = {
 	.ndo_open	= at91_open,
 	.ndo_stop	= at91_close,
 	.ndo_start_xmit	= at91_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static const struct ethtool_ops at91_ethtool_ops = {
--- a/drivers/net/can/bxcan.c
+++ b/drivers/net/can/bxcan.c
@ -881,7 +881,6 @@ static const struct net_device_ops bxcan_netdev_ops = {
 	.ndo_open = bxcan_open,
 	.ndo_stop = bxcan_stop,
 	.ndo_start_xmit = bxcan_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static const struct ethtool_ops bxcan_ethtool_ops = {
--- a/drivers/net/can/c_can/c_can_main.c
+++ b/drivers/net/can/c_can/c_can_main.c
@ -1362,7 +1362,6 @@ static const struct net_device_ops c_can_netdev_ops = {
 	.ndo_open = c_can_open,
 	.ndo_stop = c_can_close,
 	.ndo_start_xmit = c_can_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 int register_c_can_dev(struct net_device *dev)
--- a/drivers/net/can/can327.c
+++ b/drivers/net/can/can327.c
@ -849,7 +849,6 @@ static const struct net_device_ops can327_netdev_ops = {
 	.ndo_open = can327_netdev_open,
 	.ndo_stop = can327_netdev_close,
 	.ndo_start_xmit = can327_netdev_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static const struct ethtool_ops can327_ethtool_ops = {
--- a/drivers/net/can/cc770/cc770.c
+++ b/drivers/net/can/cc770/cc770.c
@ -834,7 +834,6 @@ static const struct net_device_ops cc770_netdev_ops = {
 	.ndo_open = cc770_open,
 	.ndo_stop = cc770_close,
 	.ndo_start_xmit = cc770_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static const struct ethtool_ops cc770_ethtool_ops = {
--- a/drivers/net/can/ctucanfd/ctucanfd_base.c
+++ b/drivers/net/can/ctucanfd/ctucanfd_base.c
@ -1301,7 +1301,6 @@ static const struct net_device_ops ctucan_netdev_ops = {
 	.ndo_open	= ctucan_open,
 	.ndo_stop	= ctucan_close,
 	.ndo_start_xmit	= ctucan_start_xmit,
-	.ndo_change_mtu	= can_change_mtu,
 };

 static const struct ethtool_ops ctucan_ethtool_ops = {
--- a/drivers/net/can/dev/dev.c
+++ b/drivers/net/can/dev/dev.c
@ -359,44 +359,6 @@ void can_set_default_mtu(struct net_device *dev)
 	}
 }

-/* changing MTU and control mode for CAN/CANFD devices */
-int can_change_mtu(struct net_device *dev, int new_mtu)
-{
-	struct can_priv *priv = netdev_priv(dev);
-	u32 ctrlmode_static = can_get_static_ctrlmode(priv);
-
-	/* Do not allow changing the MTU while running */
-	if (dev->flags & IFF_UP)
-		return -EBUSY;
-
-	/* allow change of MTU according to the CANFD ability of the device */
-	switch (new_mtu) {
-	case CAN_MTU:
-		/* 'CANFD-only' controllers can not switch to CAN_MTU */
-		if (ctrlmode_static & CAN_CTRLMODE_FD)
-			return -EINVAL;
-
-		priv->ctrlmode &= ~CAN_CTRLMODE_FD;
-		break;
-
-	case CANFD_MTU:
-		/* check for potential CANFD ability */
-		if (!(priv->ctrlmode_supported & CAN_CTRLMODE_FD) &&
-		    !(ctrlmode_static & CAN_CTRLMODE_FD))
-			return -EINVAL;
-
-		priv->ctrlmode |= CAN_CTRLMODE_FD;
-		break;
-
-	default:
-		return -EINVAL;
-	}
-
-	WRITE_ONCE(dev->mtu, new_mtu);
-	return 0;
-}
-EXPORT_SYMBOL_GPL(can_change_mtu);
-
 /* helper to define static CAN controller features at device creation time */
 int can_set_static_ctrlmode(struct net_device *dev, u32 static_mode)
 {
--- a/drivers/net/can/esd/esd_402_pci-core.c
+++ b/drivers/net/can/esd/esd_402_pci-core.c
@ -86,7 +86,6 @@ static const struct net_device_ops pci402_acc_netdev_ops = {
 	.ndo_open = acc_open,
 	.ndo_stop = acc_close,
 	.ndo_start_xmit = acc_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 	.ndo_eth_ioctl = can_eth_ioctl_hwts,
 };

--- a/drivers/net/can/flexcan/flexcan-core.c
+++ b/drivers/net/can/flexcan/flexcan-core.c
@ -1867,7 +1867,6 @@ static const struct net_device_ops flexcan_netdev_ops = {
 	.ndo_open	= flexcan_open,
 	.ndo_stop	= flexcan_close,
 	.ndo_start_xmit	= flexcan_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static int register_flexcandev(struct net_device *dev)
--- a/drivers/net/can/grcan.c
+++ b/drivers/net/can/grcan.c
@ -1561,7 +1561,6 @@ static const struct net_device_ops grcan_netdev_ops = {
 	.ndo_open	= grcan_open,
 	.ndo_stop	= grcan_close,
 	.ndo_start_xmit	= grcan_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static const struct ethtool_ops grcan_ethtool_ops = {
--- a/drivers/net/can/ifi_canfd/ifi_canfd.c
+++ b/drivers/net/can/ifi_canfd/ifi_canfd.c
@ -944,7 +944,6 @@ static const struct net_device_ops ifi_canfd_netdev_ops = {
 	.ndo_open	= ifi_canfd_open,
 	.ndo_stop	= ifi_canfd_close,
 	.ndo_start_xmit	= ifi_canfd_start_xmit,
-	.ndo_change_mtu	= can_change_mtu,
 };

 static const struct ethtool_ops ifi_canfd_ethtool_ops = {
--- a/drivers/net/can/janz-ican3.c
+++ b/drivers/net/can/janz-ican3.c
@ -1752,7 +1752,6 @@ static const struct net_device_ops ican3_netdev_ops = {
 	.ndo_open	= ican3_open,
 	.ndo_stop	= ican3_stop,
 	.ndo_start_xmit	= ican3_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static const struct ethtool_ops ican3_ethtool_ops = {
--- a/drivers/net/can/kvaser_pciefd/kvaser_pciefd_core.c
+++ b/drivers/net/can/kvaser_pciefd/kvaser_pciefd_core.c
@ -904,7 +904,6 @@ static const struct net_device_ops kvaser_pciefd_netdev_ops = {
 	.ndo_stop = kvaser_pciefd_stop,
 	.ndo_eth_ioctl = can_eth_ioctl_hwts,
 	.ndo_start_xmit = kvaser_pciefd_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static int kvaser_pciefd_set_phys_id(struct net_device *netdev,
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@ -23,6 +23,7 @@
 #include <linux/pinctrl/consumer.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
+#include <linux/reset.h>

 #include "m_can.h"

@ -386,8 +387,8 @@ static int m_can_cccr_update_bits(struct m_can_classdev *cdev, u32 mask, u32 val
 	size_t tries = 10;

 	if (!(mask & CCCR_INIT) && !(val_before & CCCR_INIT)) {
-		dev_err(cdev->dev,
-			"refusing to configure device when in normal mode\n");
+		netdev_err(cdev->net,
+			   "refusing to configure device when in normal mode\n");
 		return -EBUSY;
 	}

@ -451,7 +452,7 @@ static void m_can_interrupt_enable(struct m_can_classdev *cdev, u32 interrupts)
 {
 	if (cdev->active_interrupts == interrupts)
 		return;
-	cdev->ops->write_reg(cdev, M_CAN_IE, interrupts);
+	m_can_write(cdev, M_CAN_IE, interrupts);
 	cdev->active_interrupts = interrupts;
 }

@ -469,7 +470,7 @@ static void m_can_coalescing_disable(struct m_can_classdev *cdev)
 static inline void m_can_enable_all_interrupts(struct m_can_classdev *cdev)
 {
 	if (!cdev->net->irq) {
-		dev_dbg(cdev->dev, "Start hrtimer\n");
+		netdev_dbg(cdev->net, "Start hrtimer\n");
 		hrtimer_start(&cdev->hrtimer,
 			      ms_to_ktime(HRTIMER_POLL_INTERVAL_MS),
 			      HRTIMER_MODE_REL_PINNED);
@ -485,7 +486,7 @@ static inline void m_can_disable_all_interrupts(struct m_can_classdev *cdev)
 	m_can_write(cdev, M_CAN_ILE, 0x0);

 	if (!cdev->net->irq) {
-		dev_dbg(cdev->dev, "Stop hrtimer\n");
+		netdev_dbg(cdev->net, "Stop hrtimer\n");
 		hrtimer_try_to_cancel(&cdev->hrtimer);
 	}
 }
@ -790,6 +791,10 @@ static int m_can_get_berr_counter(const struct net_device *dev,
 	struct m_can_classdev *cdev = netdev_priv(dev);
 	int err;

+	/* Avoid waking up the controller if the interface is down */
+	if (!(dev->flags & IFF_UP))
+		return 0;
+
 	err = m_can_clk_start(cdev);
 	if (err)
 		return err;
@ -1379,6 +1384,27 @@ static const struct can_bittiming_const m_can_data_bittiming_const_31X = {
 	.brp_inc = 1,
 };

+static int m_can_init_ram(struct m_can_classdev *cdev)
+{
+	int end, i, start;
+	int err = 0;
+
+	/* initialize the entire Message RAM in use to avoid possible
+	 * ECC/parity checksum errors when reading an uninitialized buffer
+	 */
+	start = cdev->mcfg[MRAM_SIDF].off;
+	end = cdev->mcfg[MRAM_TXB].off +
+		cdev->mcfg[MRAM_TXB].num * TXB_ELEMENT_SIZE;
+
+	for (i = start; i < end; i += 4) {
+		err = m_can_fifo_write_no_off(cdev, i, 0x0);
+		if (err)
+			break;
+	}
+
+	return err;
+}
+
 static int m_can_set_bittiming(struct net_device *dev)
 {
 	struct m_can_classdev *cdev = netdev_priv(dev);
@ -1464,7 +1490,7 @@ static int m_can_chip_config(struct net_device *dev)

 	err = m_can_init_ram(cdev);
 	if (err) {
-		dev_err(cdev->dev, "Message RAM configuration failed\n");
+		netdev_err(dev, "Message RAM configuration failed\n");
 		return err;
 	}

@ -1694,7 +1720,7 @@ static int m_can_niso_supported(struct m_can_classdev *cdev)
 	/* Then clear the it again. */
 	ret = m_can_cccr_update_bits(cdev, CCCR_NISO, 0);
 	if (ret) {
-		dev_err(cdev->dev, "failed to revert the NON-ISO bit in CCCR\n");
+		netdev_err(cdev->net, "failed to revert the NON-ISO bit in CCCR\n");
 		return ret;
 	}

@ -1713,8 +1739,8 @@ static int m_can_dev_setup(struct m_can_classdev *cdev)
 	m_can_version = m_can_check_core_release(cdev);
 	/* return if unsupported version */
 	if (!m_can_version) {
-		dev_err(cdev->dev, "Unsupported version number: %2d",
-			m_can_version);
+		netdev_err(cdev->net, "Unsupported version number: %2d",
+			   m_can_version);
 		return -EINVAL;
 	}

@ -1772,8 +1798,8 @@ static int m_can_dev_setup(struct m_can_classdev *cdev)
 			cdev->can.ctrlmode_supported |= CAN_CTRLMODE_FD_NON_ISO;
 		break;
 	default:
-		dev_err(cdev->dev, "Unsupported version number: %2d",
-			cdev->version);
+		netdev_err(cdev->net, "Unsupported version number: %2d",
+			   cdev->version);
 		return -EINVAL;
 	}

@ -1827,6 +1853,7 @@ static int m_can_close(struct net_device *dev)

 	close_candev(dev);

+	reset_control_assert(cdev->rst);
 	m_can_clk_stop(cdev);
 	phy_power_off(cdev->transceiver);

@ -1950,11 +1977,6 @@ out_fail:

 static void m_can_tx_submit(struct m_can_classdev *cdev)
 {
-	if (cdev->version == 30)
-		return;
-	if (!cdev->is_peripheral)
-		return;
-
 	m_can_write(cdev, M_CAN_TXBAR, cdev->tx_peripheral_submit);
 	cdev->tx_peripheral_submit = 0;
 }
@ -2035,7 +2057,7 @@ static netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
 	return ret;
 }

-static enum hrtimer_restart hrtimer_callback(struct hrtimer *timer)
+static enum hrtimer_restart m_can_polling_timer(struct hrtimer *timer)
 {
 	struct m_can_classdev *cdev = container_of(timer, struct
 						   m_can_classdev, hrtimer);
@ -2069,11 +2091,15 @@ static int m_can_open(struct net_device *dev)
 	if (err)
 		goto out_phy_power_off;

+	err = reset_control_deassert(cdev->rst);
+	if (err)
+		goto exit_disable_clks;
+
 	/* open the can device */
 	err = open_candev(dev);
 	if (err) {
 		netdev_err(dev, "failed to open can device\n");
-		goto exit_disable_clks;
+		goto out_reset_control_assert;
 	}

 	if (cdev->is_peripheral)
@ -2129,6 +2155,8 @@ out_wq_fail:
 	else
 		napi_disable(&cdev->napi);
 	close_candev(dev);
+out_reset_control_assert:
+	reset_control_assert(cdev->rst);
 exit_disable_clks:
 	m_can_clk_stop(cdev);
 out_phy_power_off:
@ -2140,7 +2168,6 @@ static const struct net_device_ops m_can_netdev_ops = {
 	.ndo_open = m_can_open,
 	.ndo_stop = m_can_close,
 	.ndo_start_xmit = m_can_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static int m_can_get_coalesce(struct net_device *dev,
@ -2231,6 +2258,55 @@ static int m_can_set_coalesce(struct net_device *dev,
 	return 0;
 }

+static void m_can_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
+{
+	struct m_can_classdev *cdev = netdev_priv(dev);
+
+	wol->supported = device_can_wakeup(cdev->dev) ? WAKE_PHY : 0;
+	wol->wolopts = device_may_wakeup(cdev->dev) ? WAKE_PHY : 0;
+}
+
+static int m_can_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
+{
+	struct m_can_classdev *cdev = netdev_priv(dev);
+	bool wol_enable = !!(wol->wolopts & WAKE_PHY);
+	int ret;
+
+	if (wol->wolopts & ~WAKE_PHY)
+		return -EINVAL;
+
+	if (wol_enable == device_may_wakeup(cdev->dev))
+		return 0;
+
+	ret = device_set_wakeup_enable(cdev->dev, wol_enable);
+	if (ret) {
+		netdev_err(cdev->net, "Failed to set wakeup enable %pE\n",
+			   ERR_PTR(ret));
+		return ret;
+	}
+
+	if (!IS_ERR_OR_NULL(cdev->pinctrl_state_wakeup)) {
+		if (wol_enable)
+			ret = pinctrl_select_state(cdev->pinctrl, cdev->pinctrl_state_wakeup);
+		else
+			ret = pinctrl_pm_select_default_state(cdev->dev);
+
+		if (ret) {
+			netdev_err(cdev->net, "Failed to select pinctrl state %pE\n",
+				   ERR_PTR(ret));
+			goto err_wakeup_enable;
+		}
+	}
+
+	return 0;
+
+err_wakeup_enable:
+	/* Revert wakeup enable */
+	device_set_wakeup_enable(cdev->dev, !wol_enable);
+
+	return ret;
+}
+
 static const struct ethtool_ops m_can_ethtool_ops_coalescing = {
 	.supported_coalesce_params = ETHTOOL_COALESCE_RX_USECS_IRQ |
 		ETHTOOL_COALESCE_RX_MAX_FRAMES_IRQ |
@ -2240,10 +2316,14 @@ static const struct ethtool_ops m_can_ethtool_ops_coalescing = {
 	.get_ts_info = ethtool_op_get_ts_info,
 	.get_coalesce = m_can_get_coalesce,
 	.set_coalesce = m_can_set_coalesce,
+	.get_wol = m_can_get_wol,
+	.set_wol = m_can_set_wol,
 };

 static const struct ethtool_ops m_can_ethtool_ops = {
 	.get_ts_info = ethtool_op_get_ts_info,
+	.get_wol = m_can_get_wol,
+	.set_wol = m_can_set_wol,
 };

 static int register_m_can_dev(struct m_can_classdev *cdev)
@ -2267,8 +2347,8 @@ int m_can_check_mram_cfg(struct m_can_classdev *cdev, u32 mram_max_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);
+		netdev_err(cdev->net, "Total size of mram config(%u) exceeds mram(%u)\n",
+			   total_size, mram_max_size);
 		return -EINVAL;
 	}

@ -2303,39 +2383,17 @@ static void m_can_of_parse_mram(struct m_can_classdev *cdev,
 	cdev->mcfg[MRAM_TXB].num = mram_config_vals[7] &
 		FIELD_MAX(TXBC_NDTB_MASK);

-	dev_dbg(cdev->dev,
-		"sidf 0x%x %d xidf 0x%x %d rxf0 0x%x %d rxf1 0x%x %d rxb 0x%x %d txe 0x%x %d txb 0x%x %d\n",
-		cdev->mcfg[MRAM_SIDF].off, cdev->mcfg[MRAM_SIDF].num,
-		cdev->mcfg[MRAM_XIDF].off, cdev->mcfg[MRAM_XIDF].num,
-		cdev->mcfg[MRAM_RXF0].off, cdev->mcfg[MRAM_RXF0].num,
-		cdev->mcfg[MRAM_RXF1].off, cdev->mcfg[MRAM_RXF1].num,
-		cdev->mcfg[MRAM_RXB].off, cdev->mcfg[MRAM_RXB].num,
-		cdev->mcfg[MRAM_TXE].off, cdev->mcfg[MRAM_TXE].num,
-		cdev->mcfg[MRAM_TXB].off, cdev->mcfg[MRAM_TXB].num);
+	netdev_dbg(cdev->net,
+		   "sidf 0x%x %d xidf 0x%x %d rxf0 0x%x %d rxf1 0x%x %d rxb 0x%x %d txe 0x%x %d txb 0x%x %d\n",
+		   cdev->mcfg[MRAM_SIDF].off, cdev->mcfg[MRAM_SIDF].num,
+		   cdev->mcfg[MRAM_XIDF].off, cdev->mcfg[MRAM_XIDF].num,
+		   cdev->mcfg[MRAM_RXF0].off, cdev->mcfg[MRAM_RXF0].num,
+		   cdev->mcfg[MRAM_RXF1].off, cdev->mcfg[MRAM_RXF1].num,
+		   cdev->mcfg[MRAM_RXB].off, cdev->mcfg[MRAM_RXB].num,
+		   cdev->mcfg[MRAM_TXE].off, cdev->mcfg[MRAM_TXE].num,
+		   cdev->mcfg[MRAM_TXB].off, cdev->mcfg[MRAM_TXB].num);
 }

-int m_can_init_ram(struct m_can_classdev *cdev)
-{
-	int end, i, start;
-	int err = 0;
-
-	/* initialize the entire Message RAM in use to avoid possible
-	 * ECC/parity checksum errors when reading an uninitialized buffer
-	 */
-	start = cdev->mcfg[MRAM_SIDF].off;
-	end = cdev->mcfg[MRAM_TXB].off +
-		cdev->mcfg[MRAM_TXB].num * TXB_ELEMENT_SIZE;
-
-	for (i = start; i < end; i += 4) {
-		err = m_can_fifo_write_no_off(cdev, i, 0x0);
-		if (err)
-			break;
-	}
-
-	return err;
-}
-EXPORT_SYMBOL_GPL(m_can_init_ram);
-
 int m_can_class_get_clocks(struct m_can_classdev *cdev)
 {
 	int ret = 0;
@ -2344,7 +2402,7 @@ int m_can_class_get_clocks(struct m_can_classdev *cdev)
 	cdev->cclk = devm_clk_get(cdev->dev, "cclk");

 	if (IS_ERR(cdev->hclk) || IS_ERR(cdev->cclk)) {
-		dev_err(cdev->dev, "no clock found\n");
+		netdev_err(cdev->net, "no clock found\n");
 		ret = -ENODEV;
 	}

@ -2352,6 +2410,42 @@ int m_can_class_get_clocks(struct m_can_classdev *cdev)
 }
 EXPORT_SYMBOL_GPL(m_can_class_get_clocks);

+static bool m_can_class_wakeup_pinctrl_enabled(struct m_can_classdev *class_dev)
+{
+	return device_may_wakeup(class_dev->dev) && class_dev->pinctrl_state_wakeup;
+}
+
+static int m_can_class_parse_pinctrl(struct m_can_classdev *class_dev)
+{
+	struct device *dev = class_dev->dev;
+	int ret;
+
+	class_dev->pinctrl = devm_pinctrl_get(dev);
+	if (IS_ERR(class_dev->pinctrl)) {
+		ret = PTR_ERR(class_dev->pinctrl);
+		class_dev->pinctrl = NULL;
+
+		if (ret == -ENODEV)
+			return 0;
+
+		return dev_err_probe(dev, ret, "Failed to get pinctrl\n");
+	}
+
+	class_dev->pinctrl_state_wakeup =
+		pinctrl_lookup_state(class_dev->pinctrl, "wakeup");
+	if (IS_ERR(class_dev->pinctrl_state_wakeup)) {
+		ret = PTR_ERR(class_dev->pinctrl_state_wakeup);
+		class_dev->pinctrl_state_wakeup = NULL;
+
+		if (ret == -ENODEV)
+			return 0;
+
+		return dev_err_probe(dev, ret, "Failed to lookup pinctrl wakeup state\n");
+	}
+
+	return 0;
+}
+
 struct m_can_classdev *m_can_class_allocate_dev(struct device *dev,
 						int sizeof_priv)
 {
@ -2367,9 +2461,12 @@ struct m_can_classdev *m_can_class_allocate_dev(struct device *dev,
 					     sizeof(mram_config_vals) / 4);
 	if (ret) {
 		dev_err(dev, "Could not get Message RAM configuration.");
-		goto out;
+		return ERR_PTR(ret);
 	}

+	if (dev->of_node && of_property_read_bool(dev->of_node, "wakeup-source"))
+		device_set_wakeup_capable(dev, true);
+
 	/* Get TX FIFO size
 	 * Defines the total amount of echo buffers for loopback
 	 */
@ -2379,7 +2476,7 @@ struct m_can_classdev *m_can_class_allocate_dev(struct device *dev,
 	net_dev = alloc_candev(sizeof_priv, tx_fifo_size);
 	if (!net_dev) {
 		dev_err(dev, "Failed to allocate CAN device");
-		goto out;
+		return ERR_PTR(-ENOMEM);
 	}

 	class_dev = netdev_priv(net_dev);
@ -2389,8 +2486,16 @@ struct m_can_classdev *m_can_class_allocate_dev(struct device *dev,

 	m_can_of_parse_mram(class_dev, mram_config_vals);
 	spin_lock_init(&class_dev->tx_handling_spinlock);
-out:
+
+	ret = m_can_class_parse_pinctrl(class_dev);
+	if (ret)
+		goto err_free_candev;
+
 	return class_dev;
+
+err_free_candev:
+	free_candev(net_dev);
+	return ERR_PTR(ret);
 }
 EXPORT_SYMBOL_GPL(m_can_class_allocate_dev);

@ -2411,26 +2516,33 @@ int m_can_class_register(struct m_can_classdev *cdev)
 			devm_kzalloc(cdev->dev,
 				     cdev->tx_fifo_size * sizeof(*cdev->tx_ops),
 				     GFP_KERNEL);
-		if (!cdev->tx_ops) {
-			dev_err(cdev->dev, "Failed to allocate tx_ops for workqueue\n");
+		if (!cdev->tx_ops)
 			return -ENOMEM;
-		}
 	}

+	cdev->rst = devm_reset_control_get_optional_shared(cdev->dev, NULL);
+	if (IS_ERR(cdev->rst))
+		return dev_err_probe(cdev->dev, PTR_ERR(cdev->rst),
+				     "Failed to get reset line\n");
+
 	ret = m_can_clk_start(cdev);
 	if (ret)
 		return ret;

+	ret = reset_control_deassert(cdev->rst);
+	if (ret)
+		goto clk_disable;
+
 	if (cdev->is_peripheral) {
 		ret = can_rx_offload_add_manual(cdev->net, &cdev->offload,
 						NAPI_POLL_WEIGHT);
 		if (ret)
-			goto clk_disable;
+			goto out_reset_control_assert;
 	}

 	if (!cdev->net->irq) {
-		dev_dbg(cdev->dev, "Polling enabled, initialize hrtimer");
-		hrtimer_setup(&cdev->hrtimer, &hrtimer_callback, CLOCK_MONOTONIC,
+		netdev_dbg(cdev->net, "Polling enabled, initialize hrtimer");
+		hrtimer_setup(&cdev->hrtimer, m_can_polling_timer, CLOCK_MONOTONIC,
 			      HRTIMER_MODE_REL_PINNED);
 	} else {
 		hrtimer_setup(&cdev->hrtimer, m_can_coalescing_timer, CLOCK_MONOTONIC,
@ -2443,19 +2555,21 @@ int m_can_class_register(struct m_can_classdev *cdev)

 	ret = register_m_can_dev(cdev);
 	if (ret) {
-		dev_err(cdev->dev, "registering %s failed (err=%d)\n",
-			cdev->net->name, ret);
+		netdev_err(cdev->net, "registering %s failed (err=%d)\n",
+			   cdev->net->name, ret);
 		goto rx_offload_del;
 	}

 	of_can_transceiver(cdev->net);

-	dev_info(cdev->dev, "%s device registered (irq=%d, version=%d)\n",
-		 KBUILD_MODNAME, cdev->net->irq, cdev->version);
+	netdev_info(cdev->net, "device registered (irq=%d, version=%d)\n",
+		    cdev->net->irq, cdev->version);

 	/* Probe finished
-	 * Stop clocks. They will be reactivated once the M_CAN device is opened
+	 * Assert reset and stop clocks.
+	 * They will be reactivated once the M_CAN device is opened
 	 */
+	reset_control_assert(cdev->rst);
 	m_can_clk_stop(cdev);

 	return 0;
@ -2463,6 +2577,8 @@ int m_can_class_register(struct m_can_classdev *cdev)
 rx_offload_del:
 	if (cdev->is_peripheral)
 		can_rx_offload_del(&cdev->offload);
+out_reset_control_assert:
+	reset_control_assert(cdev->rst);
 clk_disable:
 	m_can_clk_stop(cdev);

@ -2506,7 +2622,8 @@ int m_can_class_suspend(struct device *dev)
 		cdev->can.state = CAN_STATE_SLEEPING;
 	}

-	pinctrl_pm_select_sleep_state(dev);
+	if (!m_can_class_wakeup_pinctrl_enabled(cdev))
+		pinctrl_pm_select_sleep_state(dev);

 	return ret;
 }
@ -2518,7 +2635,8 @@ int m_can_class_resume(struct device *dev)
 	struct net_device *ndev = cdev->net;
 	int ret = 0;

-	pinctrl_pm_select_default_state(dev);
+	if (!m_can_class_wakeup_pinctrl_enabled(cdev))
+		pinctrl_pm_select_default_state(dev);

 	if (netif_running(ndev)) {
 		ret = m_can_clk_start(cdev);
--- a/drivers/net/can/m_can/m_can.h
+++ b/drivers/net/can/m_can/m_can.h
@ -86,6 +86,7 @@ struct m_can_classdev {
 	struct device *dev;
 	struct clk *hclk;
 	struct clk *cclk;
+	struct reset_control *rst;

 	struct workqueue_struct *tx_wq;
 	struct phy *transceiver;
@ -128,6 +129,9 @@ struct m_can_classdev {
 	struct mram_cfg mcfg[MRAM_CFG_NUM];

 	struct hrtimer hrtimer;
+
+	struct pinctrl *pinctrl;
+	struct pinctrl_state *pinctrl_state_wakeup;
 };

 struct m_can_classdev *m_can_class_allocate_dev(struct device *dev, int sizeof_priv);
@ -135,7 +139,6 @@ void m_can_class_free_dev(struct net_device *net);
 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);
--- a/drivers/net/can/m_can/m_can_pci.c
+++ b/drivers/net/can/m_can/m_can_pci.c
@ -111,8 +111,8 @@ static int m_can_pci_probe(struct pci_dev *pci, const struct pci_device_id *id)

 	mcan_class = m_can_class_allocate_dev(&pci->dev,
 					      sizeof(struct m_can_pci_priv));
-	if (!mcan_class)
-		return -ENOMEM;
+	if (IS_ERR(mcan_class))
+		return PTR_ERR(mcan_class);

 	priv = cdev_to_priv(mcan_class);

--- a/drivers/net/can/m_can/m_can_platform.c
+++ b/drivers/net/can/m_can/m_can_platform.c
@ -87,8 +87,8 @@ static int m_can_plat_probe(struct platform_device *pdev)

 	mcan_class = m_can_class_allocate_dev(&pdev->dev,
 					      sizeof(struct m_can_plat_priv));
-	if (!mcan_class)
-		return -ENOMEM;
+	if (IS_ERR(mcan_class))
+		return PTR_ERR(mcan_class);

 	priv = cdev_to_priv(mcan_class);

--- a/drivers/net/can/m_can/tcan4x5x-core.c
+++ b/drivers/net/can/m_can/tcan4x5x-core.c
@ -416,8 +416,8 @@ static int tcan4x5x_can_probe(struct spi_device *spi)

 	mcan_class = m_can_class_allocate_dev(&spi->dev,
 					      sizeof(struct tcan4x5x_priv));
-	if (!mcan_class)
-		return -ENOMEM;
+	if (IS_ERR(mcan_class))
+		return PTR_ERR(mcan_class);

 	ret = m_can_check_mram_cfg(mcan_class, TCAN4X5X_MRAM_SIZE);
 	if (ret)
--- a/drivers/net/can/mscan/mscan.c
+++ b/drivers/net/can/mscan/mscan.c
@ -607,7 +607,6 @@ static const struct net_device_ops mscan_netdev_ops = {
 	.ndo_open	= mscan_open,
 	.ndo_stop	= mscan_close,
 	.ndo_start_xmit	= mscan_start_xmit,
-	.ndo_change_mtu	= can_change_mtu,
 };

 static const struct ethtool_ops mscan_ethtool_ops = {
--- a/drivers/net/can/peak_canfd/peak_canfd.c
+++ b/drivers/net/can/peak_canfd/peak_canfd.c
@ -773,7 +773,6 @@ static const struct net_device_ops peak_canfd_netdev_ops = {
 	.ndo_stop = peak_canfd_close,
 	.ndo_eth_ioctl = peak_eth_ioctl,
 	.ndo_start_xmit = peak_canfd_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static int peak_get_ts_info(struct net_device *dev,
--- a/drivers/net/can/rcar/rcar_can.c
+++ b/drivers/net/can/rcar/rcar_can.c
@ -635,7 +635,6 @@ static const struct net_device_ops rcar_can_netdev_ops = {
 	.ndo_open = rcar_can_open,
 	.ndo_stop = rcar_can_close,
 	.ndo_start_xmit = rcar_can_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static const struct ethtool_ops rcar_can_ethtool_ops = {
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@ -1818,7 +1818,6 @@ static const struct net_device_ops rcar_canfd_netdev_ops = {
 	.ndo_open = rcar_canfd_open,
 	.ndo_stop = rcar_canfd_close,
 	.ndo_start_xmit = rcar_canfd_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static const struct ethtool_ops rcar_canfd_ethtool_ops = {
--- a/drivers/net/can/rockchip/rockchip_canfd-core.c
+++ b/drivers/net/can/rockchip/rockchip_canfd-core.c
@ -761,7 +761,6 @@ static const struct net_device_ops rkcanfd_netdev_ops = {
 	.ndo_open = rkcanfd_open,
 	.ndo_stop = rkcanfd_stop,
 	.ndo_start_xmit = rkcanfd_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static int __maybe_unused rkcanfd_runtime_suspend(struct device *dev)
--- a/drivers/net/can/sja1000/sja1000.c
+++ b/drivers/net/can/sja1000/sja1000.c
@ -697,7 +697,6 @@ static const struct net_device_ops sja1000_netdev_ops = {
 	.ndo_open	= sja1000_open,
 	.ndo_stop	= sja1000_close,
 	.ndo_start_xmit	= sja1000_start_xmit,
-	.ndo_change_mtu	= can_change_mtu,
 };

 static const struct ethtool_ops sja1000_ethtool_ops = {
--- a/drivers/net/can/slcan/slcan-core.c
+++ b/drivers/net/can/slcan/slcan-core.c
@ -774,7 +774,6 @@ static const struct net_device_ops slcan_netdev_ops = {
 	.ndo_open               = slcan_netdev_open,
 	.ndo_stop               = slcan_netdev_close,
 	.ndo_start_xmit         = slcan_netdev_xmit,
-	.ndo_change_mtu         = can_change_mtu,
 };

 /******************************************
--- a/drivers/net/can/softing/softing_main.c
+++ b/drivers/net/can/softing/softing_main.c
@ -609,7 +609,6 @@ static const struct net_device_ops softing_netdev_ops = {
 	.ndo_open = softing_netdev_open,
 	.ndo_stop = softing_netdev_stop,
 	.ndo_start_xmit	= softing_netdev_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static const struct ethtool_ops softing_ethtool_ops = {
--- a/drivers/net/can/spi/hi311x.c
+++ b/drivers/net/can/spi/hi311x.c
@ -799,7 +799,6 @@ static const struct net_device_ops hi3110_netdev_ops = {
 	.ndo_open = hi3110_open,
 	.ndo_stop = hi3110_stop,
 	.ndo_start_xmit = hi3110_hard_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static const struct ethtool_ops hi3110_ethtool_ops = {
--- a/drivers/net/can/spi/mcp251x.c
+++ b/drivers/net/can/spi/mcp251x.c
@ -1270,7 +1270,6 @@ static const struct net_device_ops mcp251x_netdev_ops = {
 	.ndo_open = mcp251x_open,
 	.ndo_stop = mcp251x_stop,
 	.ndo_start_xmit = mcp251x_hard_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static const struct ethtool_ops mcp251x_ethtool_ops = {
--- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
+++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
@ -1715,7 +1715,6 @@ static const struct net_device_ops mcp251xfd_netdev_ops = {
 	.ndo_stop = mcp251xfd_stop,
 	.ndo_start_xmit	= mcp251xfd_start_xmit,
 	.ndo_eth_ioctl = can_eth_ioctl_hwts,
-	.ndo_change_mtu = can_change_mtu,
 };

 static void
--- a/drivers/net/can/sun4i_can.c
+++ b/drivers/net/can/sun4i_can.c
@ -768,7 +768,6 @@ static const struct net_device_ops sun4ican_netdev_ops = {
 	.ndo_open = sun4ican_open,
 	.ndo_stop = sun4ican_close,
 	.ndo_start_xmit = sun4ican_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static const struct ethtool_ops sun4ican_ethtool_ops = {
--- a/drivers/net/can/ti_hecc.c
+++ b/drivers/net/can/ti_hecc.c
@ -829,7 +829,6 @@ static const struct net_device_ops ti_hecc_netdev_ops = {
 	.ndo_open		= ti_hecc_open,
 	.ndo_stop		= ti_hecc_close,
 	.ndo_start_xmit		= ti_hecc_xmit,
-	.ndo_change_mtu		= can_change_mtu,
 };

 static const struct ethtool_ops ti_hecc_ethtool_ops = {
--- a/drivers/net/can/usb/ems_usb.c
+++ b/drivers/net/can/usb/ems_usb.c
@ -885,7 +885,6 @@ static const struct net_device_ops ems_usb_netdev_ops = {
 	.ndo_open = ems_usb_open,
 	.ndo_stop = ems_usb_close,
 	.ndo_start_xmit = ems_usb_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static const struct ethtool_ops ems_usb_ethtool_ops = {
--- a/drivers/net/can/usb/esd_usb.c
+++ b/drivers/net/can/usb/esd_usb.c
@ -1011,7 +1011,6 @@ static const struct net_device_ops esd_usb_netdev_ops = {
 	.ndo_open = esd_usb_open,
 	.ndo_stop = esd_usb_close,
 	.ndo_start_xmit = esd_usb_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static const struct ethtool_ops esd_usb_ethtool_ops = {
--- a/drivers/net/can/usb/etas_es58x/es58x_core.c
+++ b/drivers/net/can/usb/etas_es58x/es58x_core.c
@ -1977,7 +1977,6 @@ static const struct net_device_ops es58x_netdev_ops = {
 	.ndo_stop = es58x_stop,
 	.ndo_start_xmit = es58x_start_xmit,
 	.ndo_eth_ioctl = can_eth_ioctl_hwts,
-	.ndo_change_mtu = can_change_mtu,
 };

 static const struct ethtool_ops es58x_ethtool_ops = {
--- a/drivers/net/can/usb/f81604.c
+++ b/drivers/net/can/usb/f81604.c
@ -1052,7 +1052,6 @@ static const struct net_device_ops f81604_netdev_ops = {
 	.ndo_open = f81604_open,
 	.ndo_stop = f81604_close,
 	.ndo_start_xmit = f81604_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static const struct can_bittiming_const f81604_bittiming_const = {
--- a/drivers/net/can/usb/gs_usb.c
+++ b/drivers/net/can/usb/gs_usb.c
@ -1101,7 +1101,6 @@ static const struct net_device_ops gs_usb_netdev_ops = {
 	.ndo_open = gs_can_open,
 	.ndo_stop = gs_can_close,
 	.ndo_start_xmit = gs_can_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 	.ndo_eth_ioctl = gs_can_eth_ioctl,
 };

--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
@ -786,7 +786,6 @@ static const struct net_device_ops kvaser_usb_netdev_ops = {
 	.ndo_stop = kvaser_usb_close,
 	.ndo_eth_ioctl = can_eth_ioctl_hwts,
 	.ndo_start_xmit = kvaser_usb_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static const struct ethtool_ops kvaser_usb_ethtool_ops = {
--- a/drivers/net/can/usb/mcba_usb.c
+++ b/drivers/net/can/usb/mcba_usb.c
@ -761,7 +761,6 @@ static const struct net_device_ops mcba_netdev_ops = {
 	.ndo_open = mcba_usb_open,
 	.ndo_stop = mcba_usb_close,
 	.ndo_start_xmit = mcba_usb_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static const struct ethtool_ops mcba_ethtool_ops = {
--- a/drivers/net/can/usb/nct6694_canfd.c
+++ b/drivers/net/can/usb/nct6694_canfd.c
@ -690,7 +690,6 @@ static const struct net_device_ops nct6694_canfd_netdev_ops = {
 	.ndo_open = nct6694_canfd_open,
 	.ndo_stop = nct6694_canfd_close,
 	.ndo_start_xmit = nct6694_canfd_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static const struct ethtool_ops nct6694_canfd_ethtool_ops = {
--- a/drivers/net/can/usb/peak_usb/pcan_usb_core.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_core.c
@ -814,7 +814,6 @@ static const struct net_device_ops peak_usb_netdev_ops = {
 	.ndo_stop = peak_usb_ndo_stop,
 	.ndo_eth_ioctl = peak_eth_ioctl,
 	.ndo_start_xmit = peak_usb_ndo_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 /* CAN-USB devices generally handle 32-bit CAN channel IDs.
--- a/drivers/net/can/usb/ucan.c
+++ b/drivers/net/can/usb/ucan.c
@ -1233,7 +1233,6 @@ static const struct net_device_ops ucan_netdev_ops = {
 	.ndo_open = ucan_open,
 	.ndo_stop = ucan_close,
 	.ndo_start_xmit = ucan_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static const struct ethtool_ops ucan_ethtool_ops = {
--- a/drivers/net/can/usb/usb_8dev.c
+++ b/drivers/net/can/usb/usb_8dev.c
@ -868,7 +868,6 @@ static const struct net_device_ops usb_8dev_netdev_ops = {
 	.ndo_open = usb_8dev_open,
 	.ndo_stop = usb_8dev_close,
 	.ndo_start_xmit = usb_8dev_start_xmit,
-	.ndo_change_mtu = can_change_mtu,
 };

 static const struct ethtool_ops usb_8dev_ethtool_ops = {
--- a/drivers/net/can/xilinx_can.c
+++ b/drivers/net/can/xilinx_can.c
@ -1702,7 +1702,6 @@ static const struct net_device_ops xcan_netdev_ops = {
 	.ndo_open	= xcan_open,
 	.ndo_stop	= xcan_close,
 	.ndo_start_xmit	= xcan_start_xmit,
-	.ndo_change_mtu	= can_change_mtu,
 };

 static const struct ethtool_ops xcan_ethtool_ops = {
--- a/include/linux/can/dev.h
+++ b/include/linux/can/dev.h
@ -127,7 +127,6 @@ struct can_priv *safe_candev_priv(struct net_device *dev);
 int open_candev(struct net_device *dev);
 void close_candev(struct net_device *dev);
 void can_set_default_mtu(struct net_device *dev);
-int can_change_mtu(struct net_device *dev, int new_mtu);
 int __must_check can_set_static_ctrlmode(struct net_device *dev,
 					 u32 static_mode);
 int can_eth_ioctl_hwts(struct net_device *netdev, struct ifreq *ifr, int cmd);