[PATCH v3 net-next 0/6] net: enetc: Add i.MX94 ENETC support

[PATCH v3 net-next 0/6] net: enetc: Add i.MX94 ENETC support

[Wei Fang]

i.MX94 NETC has two kinds of ENETCs, one is the same as i.MX95, which
can be used as a standalone network port. The other one is an internal
ENETC, it connects to the CPU port of NETC switch through the pseudo
MAC. Also, i.MX94 have multiple PTP Timers, which is different from
i.MX95. Any PTP Timer can be bound to a specified standalone ENETC by
the IERB ETBCR registers. Currently, this patch only add ENETC support
and Timer support for i.MX94. The switch will be added by a separate
patch set.

---
v3 changes:
1. Use cleanup helper (__free(device_node)) in imx94_enetc_update_tid()
2. Collect Reviewed-by tags
v2 link: https://lore.kernel.org/imx/20251023065416.30404-1-wei.fang@nxp.com/
v2 changes:
1. Correct the compatible string in the commit message of patch 1
2. Remove the patch of ethernet-controller.yaml
3. Remove the patch of DTS
4. Optimize indentation in imx94_netcmix_init() and imx94_ierb_init()
5. Revert the change of enetc4_set_port_speed()
6. Collect Acked-by tags
v1 link: https://lore.kernel.org/imx/20251016102020.3218579-1-wei.fang@nxp.com/
---

Clark Wang (1):
  net: enetc: add ptp timer binding support for i.MX94

Wei Fang (5):
  dt-bindings: net: netc-blk-ctrl: add compatible string for i.MX94
    platforms
  dt-bindings: net: enetc: add compatible string for ENETC with pseduo
    MAC
  net: enetc: add preliminary i.MX94 NETC blocks control support
  net: enetc: add basic support for the ENETC with pseudo MAC for i.MX94
  net: enetc: add standalone ENETC support for i.MX94

 .../devicetree/bindings/net/fsl,enetc.yaml    |   1 +
 .../bindings/net/nxp,netc-blk-ctrl.yaml       |   1 +
 drivers/net/ethernet/freescale/enetc/enetc.c  |  28 ++-
 drivers/net/ethernet/freescale/enetc/enetc.h  |   8 +
 .../net/ethernet/freescale/enetc/enetc4_hw.h  |  30 +++
 .../net/ethernet/freescale/enetc/enetc4_pf.c  |  15 ++
 .../ethernet/freescale/enetc/enetc_ethtool.c  |  64 ++++++
 .../net/ethernet/freescale/enetc/enetc_hw.h   |   1 +
 .../freescale/enetc/enetc_pf_common.c         |   5 +-
 .../ethernet/freescale/enetc/netc_blk_ctrl.c  | 203 ++++++++++++++++++
 10 files changed, 354 insertions(+), 2 deletions(-)

-- 
2.34.1

[PATCH v3 net-next 1/6] dt-bindings: net: netc-blk-ctrl: add compatible string for i.MX94 platforms

[Wei Fang]

Add the compatible string "nxp,imx94-netc-blk-ctrl" for i.MX94 platforms.

Signed-off-by: Wei Fang <wei.fang@nxp.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
---
 Documentation/devicetree/bindings/net/nxp,netc-blk-ctrl.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/net/nxp,netc-blk-ctrl.yaml b/Documentation/devicetree/bindings/net/nxp,netc-blk-ctrl.yaml
index 97389fd5dbbf..deea4fd73d76 100644
--- a/Documentation/devicetree/bindings/net/nxp,netc-blk-ctrl.yaml
+++ b/Documentation/devicetree/bindings/net/nxp,netc-blk-ctrl.yaml
@@ -21,6 +21,7 @@ maintainers:
 properties:
   compatible:
     enum:
+      - nxp,imx94-netc-blk-ctrl
       - nxp,imx95-netc-blk-ctrl
 
   reg:
-- 
2.34.1

[PATCH v3 net-next 2/6] dt-bindings: net: enetc: add compatible string for ENETC with pseduo MAC

[Wei Fang]

The ENETC with pseudo MAC is used to connect to the CPU port of the NETC
switch. This ENETC has a different PCI device ID, so add a standard PCI
device compatible string to it.

Signed-off-by: Wei Fang <wei.fang@nxp.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
---
 Documentation/devicetree/bindings/net/fsl,enetc.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/net/fsl,enetc.yaml b/Documentation/devicetree/bindings/net/fsl,enetc.yaml
index ca70f0050171..aac20ab72ace 100644
--- a/Documentation/devicetree/bindings/net/fsl,enetc.yaml
+++ b/Documentation/devicetree/bindings/net/fsl,enetc.yaml
@@ -27,6 +27,7 @@ properties:
           - const: fsl,enetc
       - enum:
           - pci1131,e101
+          - pci1131,e110
 
   reg:
     maxItems: 1
-- 
2.34.1

[PATCH v3 net-next 3/6] net: enetc: add preliminary i.MX94 NETC blocks control support

[Wei Fang]

NETC blocks control is used for warm reset and pre-boot initialization.
Different versions of NETC blocks control are not exactly the same. We
need to add corresponding netc_devinfo data for each version. The NETC
version of i.MX94 is v4.3, which is different from i.MX95. Currently,
the patch adds the following configurations for ENETCs.

1. Set the link's MII protocol.
2. ENETC 0 (MAC 3) and the switch port 2 (MAC 2) share the same parallel
interface, but due to SoC constraint, they cannot be used simultaneously.
Since the switch is not supported yet, so the interface is assigned to
ENETC 0 by default.

The switch configuration will be added separately in a subsequent patch.

Signed-off-by: Wei Fang <wei.fang@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
---
 .../ethernet/freescale/enetc/netc_blk_ctrl.c  | 104 ++++++++++++++++++
 1 file changed, 104 insertions(+)

diff --git a/drivers/net/ethernet/freescale/enetc/netc_blk_ctrl.c b/drivers/net/ethernet/freescale/enetc/netc_blk_ctrl.c
index bcb8eefeb93c..5978ea096e80 100644
--- a/drivers/net/ethernet/freescale/enetc/netc_blk_ctrl.c
+++ b/drivers/net/ethernet/freescale/enetc/netc_blk_ctrl.c
@@ -47,6 +47,13 @@
 #define PCS_PROT_SFI			BIT(4)
 #define PCS_PROT_10G_SXGMII		BIT(6)
 
+#define IMX94_EXT_PIN_CONTROL		0x10
+#define  MAC2_MAC3_SEL			BIT(1)
+
+#define IMX94_NETC_LINK_CFG(a)		(0x4c + (a) * 4)
+#define  NETC_LINK_CFG_MII_PROT		GENMASK(3, 0)
+#define  NETC_LINK_CFG_IO_VAR		GENMASK(19, 16)
+
 /* NETC privileged register block register */
 #define PRB_NETCRR			0x100
 #define  NETCRR_SR			BIT(0)
@@ -68,6 +75,13 @@
 #define IMX95_ENETC1_BUS_DEVFN		0x40
 #define IMX95_ENETC2_BUS_DEVFN		0x80
 
+#define IMX94_ENETC0_BUS_DEVFN		0x100
+#define IMX94_ENETC1_BUS_DEVFN		0x140
+#define IMX94_ENETC2_BUS_DEVFN		0x180
+#define IMX94_ENETC0_LINK		3
+#define IMX94_ENETC1_LINK		4
+#define IMX94_ENETC2_LINK		5
+
 /* Flags for different platforms */
 #define NETC_HAS_NETCMIX		BIT(0)
 
@@ -192,6 +206,90 @@ static int imx95_netcmix_init(struct platform_device *pdev)
 	return 0;
 }
 
+static int imx94_enetc_get_link_id(struct device_node *np)
+{
+	int bus_devfn = netc_of_pci_get_bus_devfn(np);
+
+	/* Parse ENETC link number */
+	switch (bus_devfn) {
+	case IMX94_ENETC0_BUS_DEVFN:
+		return IMX94_ENETC0_LINK;
+	case IMX94_ENETC1_BUS_DEVFN:
+		return IMX94_ENETC1_LINK;
+	case IMX94_ENETC2_BUS_DEVFN:
+		return IMX94_ENETC2_LINK;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int imx94_link_config(struct netc_blk_ctrl *priv,
+			     struct device_node *np, int link_id)
+{
+	phy_interface_t interface;
+	int mii_proto;
+	u32 val;
+
+	/* The node may be disabled and does not have a 'phy-mode'
+	 * or 'phy-connection-type' property.
+	 */
+	if (of_get_phy_mode(np, &interface))
+		return 0;
+
+	mii_proto = netc_get_link_mii_protocol(interface);
+	if (mii_proto < 0)
+		return mii_proto;
+
+	val = mii_proto & NETC_LINK_CFG_MII_PROT;
+	if (val == MII_PROT_SERIAL)
+		val = u32_replace_bits(val, IO_VAR_16FF_16G_SERDES,
+				       NETC_LINK_CFG_IO_VAR);
+
+	netc_reg_write(priv->netcmix, IMX94_NETC_LINK_CFG(link_id), val);
+
+	return 0;
+}
+
+static int imx94_enetc_link_config(struct netc_blk_ctrl *priv,
+				   struct device_node *np)
+{
+	int link_id = imx94_enetc_get_link_id(np);
+
+	if (link_id < 0)
+		return link_id;
+
+	return imx94_link_config(priv, np, link_id);
+}
+
+static int imx94_netcmix_init(struct platform_device *pdev)
+{
+	struct netc_blk_ctrl *priv = platform_get_drvdata(pdev);
+	struct device_node *np = pdev->dev.of_node;
+	u32 val;
+	int err;
+
+	for_each_child_of_node_scoped(np, child) {
+		for_each_child_of_node_scoped(child, gchild) {
+			if (!of_device_is_compatible(gchild, "pci1131,e101"))
+				continue;
+
+			err = imx94_enetc_link_config(priv, gchild);
+			if (err)
+				return err;
+		}
+	}
+
+	/* ENETC 0 and switch port 2 share the same parallel interface.
+	 * Currently, the switch is not supported, so this interface is
+	 * used by ENETC 0 by default.
+	 */
+	val = netc_reg_read(priv->netcmix, IMX94_EXT_PIN_CONTROL);
+	val |= MAC2_MAC3_SEL;
+	netc_reg_write(priv->netcmix, IMX94_EXT_PIN_CONTROL, val);
+
+	return 0;
+}
+
 static bool netc_ierb_is_locked(struct netc_blk_ctrl *priv)
 {
 	return !!(netc_reg_read(priv->prb, PRB_NETCRR) & NETCRR_LOCK);
@@ -340,8 +438,14 @@ static const struct netc_devinfo imx95_devinfo = {
 	.ierb_init = imx95_ierb_init,
 };
 
+static const struct netc_devinfo imx94_devinfo = {
+	.flags = NETC_HAS_NETCMIX,
+	.netcmix_init = imx94_netcmix_init,
+};
+
 static const struct of_device_id netc_blk_ctrl_match[] = {
 	{ .compatible = "nxp,imx95-netc-blk-ctrl", .data = &imx95_devinfo },
+	{ .compatible = "nxp,imx94-netc-blk-ctrl", .data = &imx94_devinfo },
 	{},
 };
 MODULE_DEVICE_TABLE(of, netc_blk_ctrl_match);
-- 
2.34.1

[PATCH v3 net-next 4/6] net: enetc: add ptp timer binding support for i.MX94

[Wei Fang]

From: Clark Wang <xiaoning.wang@nxp.com>

The i.MX94 has three PTP timers, and all standalone ENETCs can select
one of them to bind to as their PHC. The 'ptp-timer' property is used
to represent the PTP device of the Ethernet controller. So users can
add 'ptp-timer' to the ENETC node to specify the PTP timer. The driver
parses this property to bind the two hardware devices.

If the "ptp-timer" property is not present, the first timer of the PCIe
bus where the ENETC is located is used as the default bound PTP timer.

Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
Signed-off-by: Wei Fang <wei.fang@nxp.com>
---
 .../ethernet/freescale/enetc/netc_blk_ctrl.c  | 99 +++++++++++++++++++
 1 file changed, 99 insertions(+)

diff --git a/drivers/net/ethernet/freescale/enetc/netc_blk_ctrl.c b/drivers/net/ethernet/freescale/enetc/netc_blk_ctrl.c
index 5978ea096e80..3fe8f864bcf4 100644
--- a/drivers/net/ethernet/freescale/enetc/netc_blk_ctrl.c
+++ b/drivers/net/ethernet/freescale/enetc/netc_blk_ctrl.c
@@ -66,6 +66,7 @@
 /* NETC integrated endpoint register block register */
 #define IERB_EMDIOFAUXR			0x344
 #define IERB_T0FAUXR			0x444
+#define IERB_ETBCR(a)			(0x300c + 0x100 * (a))
 #define IERB_EFAUXR(a)			(0x3044 + 0x100 * (a))
 #define IERB_VFAUXR(a)			(0x4004 + 0x40 * (a))
 #define FAUXR_LDID			GENMASK(3, 0)
@@ -78,10 +79,16 @@
 #define IMX94_ENETC0_BUS_DEVFN		0x100
 #define IMX94_ENETC1_BUS_DEVFN		0x140
 #define IMX94_ENETC2_BUS_DEVFN		0x180
+#define IMX94_TIMER0_BUS_DEVFN		0x1
+#define IMX94_TIMER1_BUS_DEVFN		0x101
+#define IMX94_TIMER2_BUS_DEVFN		0x181
 #define IMX94_ENETC0_LINK		3
 #define IMX94_ENETC1_LINK		4
 #define IMX94_ENETC2_LINK		5
 
+#define NETC_ENETC_ID(a)		(a)
+#define NETC_TIMER_ID(a)		(a)
+
 /* Flags for different platforms */
 #define NETC_HAS_NETCMIX		BIT(0)
 
@@ -345,6 +352,97 @@ static int imx95_ierb_init(struct platform_device *pdev)
 	return 0;
 }
 
+static int imx94_get_enetc_id(struct device_node *np)
+{
+	int bus_devfn = netc_of_pci_get_bus_devfn(np);
+
+	/* Parse ENETC offset */
+	switch (bus_devfn) {
+	case IMX94_ENETC0_BUS_DEVFN:
+		return NETC_ENETC_ID(0);
+	case IMX94_ENETC1_BUS_DEVFN:
+		return NETC_ENETC_ID(1);
+	case IMX94_ENETC2_BUS_DEVFN:
+		return NETC_ENETC_ID(2);
+	default:
+		return -EINVAL;
+	}
+}
+
+static int imx94_get_timer_id(struct device_node *np)
+{
+	int bus_devfn = netc_of_pci_get_bus_devfn(np);
+
+	/* Parse NETC PTP timer ID, the timer0 is on bus 0,
+	 * the timer 1 and timer2 is on bus 1.
+	 */
+	switch (bus_devfn) {
+	case IMX94_TIMER0_BUS_DEVFN:
+		return NETC_TIMER_ID(0);
+	case IMX94_TIMER1_BUS_DEVFN:
+		return NETC_TIMER_ID(1);
+	case IMX94_TIMER2_BUS_DEVFN:
+		return NETC_TIMER_ID(2);
+	default:
+		return -EINVAL;
+	}
+}
+
+static int imx94_enetc_update_tid(struct netc_blk_ctrl *priv,
+				  struct device_node *np)
+{
+	struct device_node *timer_np __free(device_node) = NULL;
+	struct device *dev = &priv->pdev->dev;
+	int eid, tid;
+
+	eid = imx94_get_enetc_id(np);
+	if (eid < 0) {
+		dev_err(dev, "Failed to get ENETC ID\n");
+		return eid;
+	}
+
+	timer_np = of_parse_phandle(np, "ptp-timer", 0);
+	if (!timer_np) {
+		/* If 'ptp-timer' is not present, the timer1 is the default
+		 * timer of all standalone ENETCs, which is on the same PCIe
+		 * bus as these ENETCs.
+		 */
+		tid = NETC_TIMER_ID(1);
+		goto end;
+	}
+
+	tid = imx94_get_timer_id(timer_np);
+	if (tid < 0) {
+		dev_err(dev, "Failed to get NETC Timer ID\n");
+		return tid;
+	}
+
+end:
+	netc_reg_write(priv->ierb, IERB_ETBCR(eid), tid);
+
+	return 0;
+}
+
+static int imx94_ierb_init(struct platform_device *pdev)
+{
+	struct netc_blk_ctrl *priv = platform_get_drvdata(pdev);
+	struct device_node *np = pdev->dev.of_node;
+	int err;
+
+	for_each_child_of_node_scoped(np, child) {
+		for_each_child_of_node_scoped(child, gchild) {
+			if (!of_device_is_compatible(gchild, "pci1131,e101"))
+				continue;
+
+			err = imx94_enetc_update_tid(priv, gchild);
+			if (err)
+				return err;
+		}
+	}
+
+	return 0;
+}
+
 static int netc_ierb_init(struct platform_device *pdev)
 {
 	struct netc_blk_ctrl *priv = platform_get_drvdata(pdev);
@@ -441,6 +539,7 @@ static const struct netc_devinfo imx95_devinfo = {
 static const struct netc_devinfo imx94_devinfo = {
 	.flags = NETC_HAS_NETCMIX,
 	.netcmix_init = imx94_netcmix_init,
+	.ierb_init = imx94_ierb_init,
 };
 
 static const struct of_device_id netc_blk_ctrl_match[] = {
-- 
2.34.1

Re: [PATCH v3 net-next 4/6] net: enetc: add ptp timer binding support for i.MX94

[Jakub Kicinski]

On Mon, 27 Oct 2025 09:45:01 +0800 Wei Fang wrote:
> +	struct device_node *timer_np __free(device_node) = NULL;

Please go back to the code from v2.

Quoting documentation:

  Using device-managed and cleanup.h constructs
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  
  Netdev remains skeptical about promises of all "auto-cleanup" APIs,
  including even ``devm_`` helpers, historically. They are not the preferred
  style of implementation, merely an acceptable one.
  
  Use of ``guard()`` is discouraged within any function longer than 20 lines,
  ``scoped_guard()`` is considered more readable. Using normal lock/unlock is
  still (weakly) preferred.
  
  Low level cleanup constructs (such as ``__free()``) can be used when building
  APIs and helpers, especially scoped iterators. However, direct use of
  ``__free()`` within networking core and drivers is discouraged.
  Similar guidance applies to declaring variables mid-function.
  
See: https://www.kernel.org/doc/html/next/process/maintainer-netdev.html#using-device-managed-and-cleanup-h-constructs

RE: [PATCH v3 net-next 4/6] net: enetc: add ptp timer binding support for i.MX94

[Wei Fang]

> On Mon, 27 Oct 2025 09:45:01 +0800 Wei Fang wrote:
> > +	struct device_node *timer_np __free(device_node) = NULL;
> 
> Please go back to the code from v2.

Okay, thanks.

[PATCH v3 net-next 5/6] net: enetc: add basic support for the ENETC with pseudo MAC for i.MX94

[Wei Fang]

The ENETC with pseudo MAC is an internal port which connects to the CPU
port of the switch. The switch CPU/host ENETC is fully integrated with
the switch and does not require a back-to-back MAC, instead a light
weight "pseudo MAC" provides the delineation between switch and ENETC.
This translates to lower power (less logic and memory) and lower delay
(as there is no serialization delay across this link).

Different from the standalone ENETC which is used as the external port,
the internal ENETC has a different PCIe device ID, and it does not have
Ethernet MAC port registers, instead, it has a small number of pseudo
MAC port registers, so some features are not supported by pseudo MAC,
such as loopback, half duplex, one-step timestamping and so on.

Therefore, the configuration of this internal ENETC is also somewhat
different from that of the standalone ENETC. So add the basic support
for ENETC with pseudo MAC. More supports will be added in the future.

Signed-off-by: Wei Fang <wei.fang@nxp.com>
---
 drivers/net/ethernet/freescale/enetc/enetc.c  | 24 +++++++-
 drivers/net/ethernet/freescale/enetc/enetc.h  |  8 +++
 .../net/ethernet/freescale/enetc/enetc4_hw.h  | 30 +++++++++
 .../net/ethernet/freescale/enetc/enetc4_pf.c  | 15 +++++
 .../ethernet/freescale/enetc/enetc_ethtool.c  | 61 +++++++++++++++++++
 .../net/ethernet/freescale/enetc/enetc_hw.h   |  1 +
 .../freescale/enetc/enetc_pf_common.c         |  5 +-
 7 files changed, 142 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
index aae462a0cf5a..88eeb0f51d41 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc.c
@@ -14,12 +14,21 @@
 
 u32 enetc_port_mac_rd(struct enetc_si *si, u32 reg)
 {
+	/* ENETC with pseudo MAC does not have Ethernet MAC
+	 * port registers.
+	 */
+	if (enetc_is_pseudo_mac(si))
+		return 0;
+
 	return enetc_port_rd(&si->hw, reg);
 }
 EXPORT_SYMBOL_GPL(enetc_port_mac_rd);
 
 void enetc_port_mac_wr(struct enetc_si *si, u32 reg, u32 val)
 {
+	if (enetc_is_pseudo_mac(si))
+		return;
+
 	enetc_port_wr(&si->hw, reg, val);
 	if (si->hw_features & ENETC_SI_F_QBU)
 		enetc_port_wr(&si->hw, reg + si->drvdata->pmac_offset, val);
@@ -3350,7 +3359,8 @@ int enetc_hwtstamp_set(struct net_device *ndev,
 		new_offloads |= ENETC_F_TX_TSTAMP;
 		break;
 	case HWTSTAMP_TX_ONESTEP_SYNC:
-		if (!enetc_si_is_pf(priv->si))
+		if (!enetc_si_is_pf(priv->si) ||
+		    enetc_is_pseudo_mac(priv->si))
 			return -EOPNOTSUPP;
 
 		new_offloads &= ~ENETC_F_TX_TSTAMP_MASK;
@@ -3691,6 +3701,13 @@ static const struct enetc_drvdata enetc4_pf_data = {
 	.eth_ops = &enetc4_pf_ethtool_ops,
 };
 
+static const struct enetc_drvdata enetc4_ppm_data = {
+	.sysclk_freq = ENETC_CLK_333M,
+	.tx_csum = true,
+	.max_frags = ENETC4_MAX_SKB_FRAGS,
+	.eth_ops = &enetc4_ppm_ethtool_ops,
+};
+
 static const struct enetc_drvdata enetc_vf_data = {
 	.sysclk_freq = ENETC_CLK_400M,
 	.max_frags = ENETC_MAX_SKB_FRAGS,
@@ -3710,6 +3727,11 @@ static const struct enetc_platform_info enetc_info[] = {
 	  .dev_id = ENETC_DEV_ID_VF,
 	  .data = &enetc_vf_data,
 	},
+	{
+	  .revision = ENETC_REV_4_3,
+	  .dev_id = NXP_ENETC_PPM_DEV_ID,
+	  .data = &enetc4_ppm_data,
+	},
 };
 
 int enetc_get_driver_data(struct enetc_si *si)
diff --git a/drivers/net/ethernet/freescale/enetc/enetc.h b/drivers/net/ethernet/freescale/enetc/enetc.h
index 0ec010a7d640..a202dbd4b40a 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc.h
@@ -273,6 +273,7 @@ enum enetc_errata {
 #define ENETC_SI_F_QBV  BIT(1)
 #define ENETC_SI_F_QBU  BIT(2)
 #define ENETC_SI_F_LSO	BIT(3)
+#define ENETC_SI_F_PPM	BIT(4) /* pseudo MAC */
 
 struct enetc_drvdata {
 	u32 pmac_offset; /* Only valid for PSI which supports 802.1Qbu */
@@ -362,6 +363,11 @@ static inline int enetc_pf_to_port(struct pci_dev *pf_pdev)
 	}
 }
 
+static inline bool enetc_is_pseudo_mac(struct enetc_si *si)
+{
+	return si->hw_features & ENETC_SI_F_PPM;
+}
+
 #define ENETC_MAX_NUM_TXQS	8
 #define ENETC_INT_NAME_MAX	(IFNAMSIZ + 8)
 
@@ -534,6 +540,8 @@ int enetc_hwtstamp_set(struct net_device *ndev,
 extern const struct ethtool_ops enetc_pf_ethtool_ops;
 extern const struct ethtool_ops enetc4_pf_ethtool_ops;
 extern const struct ethtool_ops enetc_vf_ethtool_ops;
+extern const struct ethtool_ops enetc4_ppm_ethtool_ops;
+
 void enetc_set_ethtool_ops(struct net_device *ndev);
 void enetc_mm_link_state_update(struct enetc_ndev_priv *priv, bool link);
 void enetc_mm_commit_preemptible_tcs(struct enetc_ndev_priv *priv);
diff --git a/drivers/net/ethernet/freescale/enetc/enetc4_hw.h b/drivers/net/ethernet/freescale/enetc/enetc4_hw.h
index 19bf0e89cdc2..ebea4298791c 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc4_hw.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc4_hw.h
@@ -11,6 +11,7 @@
 
 #define NXP_ENETC_VENDOR_ID		0x1131
 #define NXP_ENETC_PF_DEV_ID		0xe101
+#define NXP_ENETC_PPM_DEV_ID		0xe110
 
 /**********************Station interface registers************************/
 /* Station interface LSO segmentation flag mask register 0/1 */
@@ -115,6 +116,10 @@
 #define  PMCAPR_HD			BIT(8)
 #define  PMCAPR_FP			GENMASK(10, 9)
 
+/* Port capability register */
+#define ENETC4_PCAPR			0x4000
+#define  PCAPR_LINK_TYPE		BIT(4)
+
 /* Port configuration register */
 #define ENETC4_PCR			0x4010
 #define  PCR_HDR_FMT			BIT(0)
@@ -193,4 +198,29 @@
 #define   SSP_1G			2
 #define  PM_IF_MODE_ENA			BIT(15)
 
+/**********************ENETC Pseudo MAC port registers************************/
+/* Port pseudo MAC receive octets counter (64-bit) */
+#define ENETC4_PPMROCR			0x5080
+
+/* Port pseudo MAC receive unicast frame counter register (64-bit) */
+#define ENETC4_PPMRUFCR			0x5088
+
+/* Port pseudo MAC receive multicast frame counter register (64-bit) */
+#define ENETC4_PPMRMFCR			0x5090
+
+/* Port pseudo MAC receive broadcast frame counter register (64-bit) */
+#define ENETC4_PPMRBFCR			0x5098
+
+/* Port pseudo MAC transmit octets counter (64-bit) */
+#define ENETC4_PPMTOCR			0x50c0
+
+/* Port pseudo MAC transmit unicast frame counter register (64-bit) */
+#define ENETC4_PPMTUFCR			0x50c8
+
+/* Port pseudo MAC transmit multicast frame counter register (64-bit) */
+#define ENETC4_PPMTMFCR			0x50d0
+
+/* Port pseudo MAC transmit broadcast frame counter register (64-bit) */
+#define ENETC4_PPMTBFCR			0x50d8
+
 #endif
diff --git a/drivers/net/ethernet/freescale/enetc/enetc4_pf.c b/drivers/net/ethernet/freescale/enetc/enetc4_pf.c
index 82c443b28b15..498346dd996a 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc4_pf.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc4_pf.c
@@ -41,6 +41,16 @@ static void enetc4_get_port_caps(struct enetc_pf *pf)
 	pf->caps.mac_filter_num = val & PSIMAFCAPR_NUM_MAC_AFTE;
 }
 
+static void enetc4_get_psi_hw_features(struct enetc_si *si)
+{
+	struct enetc_hw *hw = &si->hw;
+	u32 val;
+
+	val = enetc_port_rd(hw, ENETC4_PCAPR);
+	if (val & PCAPR_LINK_TYPE)
+		si->hw_features |= ENETC_SI_F_PPM;
+}
+
 static void enetc4_pf_set_si_primary_mac(struct enetc_hw *hw, int si,
 					 const u8 *addr)
 {
@@ -277,6 +287,7 @@ static int enetc4_pf_struct_init(struct enetc_si *si)
 	pf->ops = &enetc4_pf_ops;
 
 	enetc4_get_port_caps(pf);
+	enetc4_get_psi_hw_features(si);
 
 	return 0;
 }
@@ -589,6 +600,9 @@ static void enetc4_mac_config(struct enetc_pf *pf, unsigned int mode,
 	struct enetc_si *si = pf->si;
 	u32 val;
 
+	if (enetc_is_pseudo_mac(si))
+		return;
+
 	val = enetc_port_mac_rd(si, ENETC4_PM_IF_MODE(0));
 	val &= ~(PM_IF_MODE_IFMODE | PM_IF_MODE_ENA);
 
@@ -1071,6 +1085,7 @@ static void enetc4_pf_remove(struct pci_dev *pdev)
 
 static const struct pci_device_id enetc4_pf_id_table[] = {
 	{ PCI_DEVICE(NXP_ENETC_VENDOR_ID, NXP_ENETC_PF_DEV_ID) },
+	{ PCI_DEVICE(NXP_ENETC_VENDOR_ID, NXP_ENETC_PPM_DEV_ID) },
 	{ 0, } /* End of table. */
 };
 MODULE_DEVICE_TABLE(pci, enetc4_pf_id_table);
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c b/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c
index 71d052de669a..5ef2c5f3ff8f 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c
@@ -435,6 +435,48 @@ static void enetc_get_eth_mac_stats(struct net_device *ndev,
 	}
 }
 
+static void enetc_ppm_mac_stats(struct enetc_si *si,
+				struct ethtool_eth_mac_stats *s)
+{
+	struct enetc_hw *hw = &si->hw;
+	u64 rufcr, rmfcr, rbfcr;
+	u64 tufcr, tmfcr, tbfcr;
+
+	rufcr = enetc_port_rd64(hw, ENETC4_PPMRUFCR);
+	rmfcr = enetc_port_rd64(hw, ENETC4_PPMRMFCR);
+	rbfcr = enetc_port_rd64(hw, ENETC4_PPMRBFCR);
+
+	tufcr = enetc_port_rd64(hw, ENETC4_PPMTUFCR);
+	tmfcr = enetc_port_rd64(hw, ENETC4_PPMTMFCR);
+	tbfcr = enetc_port_rd64(hw, ENETC4_PPMTBFCR);
+
+	s->FramesTransmittedOK = tufcr + tmfcr + tbfcr;
+	s->FramesReceivedOK = rufcr + rmfcr + rbfcr;
+	s->OctetsTransmittedOK = enetc_port_rd64(hw, ENETC4_PPMTOCR);
+	s->OctetsReceivedOK = enetc_port_rd64(hw, ENETC4_PPMROCR);
+	s->MulticastFramesXmittedOK = tmfcr;
+	s->BroadcastFramesXmittedOK = tbfcr;
+	s->MulticastFramesReceivedOK = rmfcr;
+	s->BroadcastFramesReceivedOK = rbfcr;
+}
+
+static void enetc_ppm_get_eth_mac_stats(struct net_device *ndev,
+					struct ethtool_eth_mac_stats *mac_stats)
+{
+	struct enetc_ndev_priv *priv = netdev_priv(ndev);
+
+	switch (mac_stats->src) {
+	case ETHTOOL_MAC_STATS_SRC_EMAC:
+		enetc_ppm_mac_stats(priv->si, mac_stats);
+		break;
+	case ETHTOOL_MAC_STATS_SRC_PMAC:
+		break;
+	case ETHTOOL_MAC_STATS_SRC_AGGREGATE:
+		ethtool_aggregate_mac_stats(ndev, mac_stats);
+		break;
+	}
+}
+
 static void enetc_get_eth_ctrl_stats(struct net_device *ndev,
 				     struct ethtool_eth_ctrl_stats *ctrl_stats)
 {
@@ -1313,6 +1355,25 @@ const struct ethtool_ops enetc_pf_ethtool_ops = {
 	.get_mm_stats = enetc_get_mm_stats,
 };
 
+const struct ethtool_ops enetc4_ppm_ethtool_ops = {
+	.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
+				     ETHTOOL_COALESCE_MAX_FRAMES |
+				     ETHTOOL_COALESCE_USE_ADAPTIVE_RX,
+	.get_eth_mac_stats = enetc_ppm_get_eth_mac_stats,
+	.get_rxnfc = enetc4_get_rxnfc,
+	.get_rxfh_key_size = enetc_get_rxfh_key_size,
+	.get_rxfh_indir_size = enetc_get_rxfh_indir_size,
+	.get_rxfh = enetc_get_rxfh,
+	.set_rxfh = enetc_set_rxfh,
+	.get_rxfh_fields = enetc_get_rxfh_fields,
+	.get_ringparam = enetc_get_ringparam,
+	.get_coalesce = enetc_get_coalesce,
+	.set_coalesce = enetc_set_coalesce,
+	.get_link_ksettings = enetc_get_link_ksettings,
+	.set_link_ksettings = enetc_set_link_ksettings,
+	.get_link = ethtool_op_get_link,
+};
+
 const struct ethtool_ops enetc_vf_ethtool_ops = {
 	.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
 				     ETHTOOL_COALESCE_MAX_FRAMES |
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_hw.h b/drivers/net/ethernet/freescale/enetc/enetc_hw.h
index 377c96325814..7b882b8921fe 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_hw.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc_hw.h
@@ -378,6 +378,7 @@ enum enetc_bdr_type {TX, RX};
 #define EIPBRR0_REVISION	GENMASK(15, 0)
 #define ENETC_REV_1_0		0x0100
 #define ENETC_REV_4_1		0X0401
+#define ENETC_REV_4_3		0x0403
 
 #define ENETC_G_EIPBRR1		0x0bfc
 #define ENETC_G_EPFBLPR(n)	(0xd00 + 4 * (n))
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c b/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c
index edf14a95cab7..9c634205e2a7 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c
@@ -109,7 +109,7 @@ void enetc_pf_netdev_setup(struct enetc_si *si, struct net_device *ndev,
 
 	ndev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
 			    NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX |
-			    NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_LOOPBACK |
+			    NETIF_F_HW_VLAN_CTAG_FILTER |
 			    NETIF_F_HW_CSUM | NETIF_F_TSO | NETIF_F_TSO6 |
 			    NETIF_F_GSO_UDP_L4;
 	ndev->features = NETIF_F_HIGHDMA | NETIF_F_SG | NETIF_F_RXCSUM |
@@ -133,6 +133,9 @@ void enetc_pf_netdev_setup(struct enetc_si *si, struct net_device *ndev,
 		ndev->features |= NETIF_F_RXHASH;
 	}
 
+	if (!enetc_is_pseudo_mac(si))
+		ndev->hw_features |= NETIF_F_LOOPBACK;
+
 	/* TODO: currently, i.MX95 ENETC driver does not support advanced features */
 	if (!is_enetc_rev1(si))
 		goto end;
-- 
2.34.1

RE: [PATCH v3 net-next 5/6] net: enetc: add basic support for the ENETC with pseudo MAC for i.MX94

[Claudiu Manoil]

> -----Original Message-----
> From: Wei Fang <wei.fang@nxp.com>
> Sent: Monday, October 27, 2025 3:45 AM
[...]
> Subject: [PATCH v3 net-next 5/6] net: enetc: add basic support for the ENETC
> with pseudo MAC for i.MX94
> 
> The ENETC with pseudo MAC is an internal port which connects to the CPU
> port of the switch. The switch CPU/host ENETC is fully integrated with
> the switch and does not require a back-to-back MAC, instead a light
> weight "pseudo MAC" provides the delineation between switch and ENETC.
> This translates to lower power (less logic and memory) and lower delay
> (as there is no serialization delay across this link).
> 
> Different from the standalone ENETC which is used as the external port,
> the internal ENETC has a different PCIe device ID, and it does not have
> Ethernet MAC port registers, instead, it has a small number of pseudo
> MAC port registers, so some features are not supported by pseudo MAC,
> such as loopback, half duplex, one-step timestamping and so on.
> 
> Therefore, the configuration of this internal ENETC is also somewhat
> different from that of the standalone ENETC. So add the basic support
> for ENETC with pseudo MAC. More supports will be added in the future.
> 
> Signed-off-by: Wei Fang <wei.fang@nxp.com>

Reviewed-by: Claudiu Manoil <claudiu.manoil@nxp.com>

[PATCH v3 net-next 6/6] net: enetc: add standalone ENETC support for i.MX94

[Wei Fang]

The revision of i.MX94 ENETC is changed to v4.3, so add this revision to
enetc_info to support i.MX94 ENETC. And add PTP suspport for i.MX94.

Signed-off-by: Wei Fang <wei.fang@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
---
 drivers/net/ethernet/freescale/enetc/enetc.c         | 4 ++++
 drivers/net/ethernet/freescale/enetc/enetc_ethtool.c | 3 +++
 2 files changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
index 88eeb0f51d41..15783f56dd39 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc.c
@@ -3732,6 +3732,10 @@ static const struct enetc_platform_info enetc_info[] = {
 	  .dev_id = NXP_ENETC_PPM_DEV_ID,
 	  .data = &enetc4_ppm_data,
 	},
+	{ .revision = ENETC_REV_4_3,
+	  .dev_id = NXP_ENETC_PF_DEV_ID,
+	  .data = &enetc4_pf_data,
+	},
 };
 
 int enetc_get_driver_data(struct enetc_si *si)
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c b/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c
index 5ef2c5f3ff8f..3e222321b937 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_ethtool.c
@@ -936,6 +936,9 @@ static int enetc_get_phc_index_by_pdev(struct enetc_si *si)
 	case ENETC_REV_4_1:
 		devfn = PCI_DEVFN(24, 0);
 		break;
+	case ENETC_REV_4_3:
+		devfn = PCI_DEVFN(0, 1);
+		break;
 	default:
 		return -1;
 	}
-- 
2.34.1

Re: [PATCH v3 net-next 0/6] net: enetc: Add i.MX94 ENETC support

[Jakub Kicinski]

On Mon, 27 Oct 2025 09:44:57 +0800 Wei Fang wrote:
> i.MX94 NETC has two kinds of ENETCs, one is the same as i.MX95, which
> can be used as a standalone network port. The other one is an internal
> ENETC, it connects to the CPU port of NETC switch through the pseudo
> MAC. Also, i.MX94 have multiple PTP Timers, which is different from
> i.MX95. Any PTP Timer can be bound to a specified standalone ENETC by
> the IERB ETBCR registers. Currently, this patch only add ENETC support
> and Timer support for i.MX94. The switch will be added by a separate
> patch set.

Is there a reason to add the imx94 code after imx95?
If in doubt order things alphabetically.

RE: [PATCH v3 net-next 0/6] net: enetc: Add i.MX94 ENETC support

[Wei Fang]

> On Mon, 27 Oct 2025 09:44:57 +0800 Wei Fang wrote:
> > i.MX94 NETC has two kinds of ENETCs, one is the same as i.MX95, which
> > can be used as a standalone network port. The other one is an internal
> > ENETC, it connects to the CPU port of NETC switch through the pseudo
> > MAC. Also, i.MX94 have multiple PTP Timers, which is different from
> > i.MX95. Any PTP Timer can be bound to a specified standalone ENETC by
> > the IERB ETBCR registers. Currently, this patch only add ENETC support
> > and Timer support for i.MX94. The switch will be added by a separate
> > patch set.
> 
> Is there a reason to add the imx94 code after imx95?

Actually, i.MX94 is the latest i.MX SoC, which is tapped out after
i.MX95 (about 1 year).

Re: [PATCH v3 net-next 0/6] net: enetc: Add i.MX94 ENETC support

[Jakub Kicinski]

On Wed, 29 Oct 2025 00:13:14 +0000 Wei Fang wrote:
> > On Mon, 27 Oct 2025 09:44:57 +0800 Wei Fang wrote:  
> > > i.MX94 NETC has two kinds of ENETCs, one is the same as i.MX95, which
> > > can be used as a standalone network port. The other one is an internal
> > > ENETC, it connects to the CPU port of NETC switch through the pseudo
> > > MAC. Also, i.MX94 have multiple PTP Timers, which is different from
> > > i.MX95. Any PTP Timer can be bound to a specified standalone ENETC by
> > > the IERB ETBCR registers. Currently, this patch only add ENETC support
> > > and Timer support for i.MX94. The switch will be added by a separate
> > > patch set.  
> > 
> > Is there a reason to add the imx94 code after imx95?  
> 
> Actually, i.MX94 is the latest i.MX SoC, which is tapped out after
> i.MX95 (about 1 year).

I see, so there is some logic behind it.

I'm not sure this will still be clear 10 years from now to the people
who come after us. 1 year is not a long time. But up to you..

RE: [PATCH v3 net-next 0/6] net: enetc: Add i.MX94 ENETC support

[Wei Fang]

> On Wed, 29 Oct 2025 00:13:14 +0000 Wei Fang wrote:
> > > On Mon, 27 Oct 2025 09:44:57 +0800 Wei Fang wrote:
> > > > i.MX94 NETC has two kinds of ENETCs, one is the same as i.MX95, which
> > > > can be used as a standalone network port. The other one is an internal
> > > > ENETC, it connects to the CPU port of NETC switch through the pseudo
> > > > MAC. Also, i.MX94 have multiple PTP Timers, which is different from
> > > > i.MX95. Any PTP Timer can be bound to a specified standalone ENETC by
> > > > the IERB ETBCR registers. Currently, this patch only add ENETC support
> > > > and Timer support for i.MX94. The switch will be added by a separate
> > > > patch set.
> > >
> > > Is there a reason to add the imx94 code after imx95?
> >
> > Actually, i.MX94 is the latest i.MX SoC, which is tapped out after
> > i.MX95 (about 1 year).
> 
> I see, so there is some logic behind it.
> 
> I'm not sure this will still be clear 10 years from now to the people
> who come after us. 1 year is not a long time. But up to you..

I think I can add this info in the commit message, so it will be more
clear to others.