[PATCH net-next v4 0/6] net: enetc: S32N79 pseudo-MAC (PPM) networking support

[PATCH net-next v4 0/6] net: enetc: S32N79 pseudo-MAC (PPM) networking support

[Claudiu Manoil]

This series adds networking support for the ENETCv4.4 pseudo-MAC (PPM)
ports found on the NXP S32N79 SoC. On S32N79, the ENETCv4 ports are
not wired to any external PHY/MII; instead they are internal "pseudo-MAC"
links into the on-chip NETC switch. These links are proprietary, expose
no standard IEEE interface, and run at a speed fixed at boot time by the
Port PCR[PSPEED] register.

A key use case is a port that has no "ethernet" DT node at all: NETC is
reached over PCI from a host that probes the ENETC, while the internal
NETC switch it connects to is not owned by Linux. Such a port must have
its fixed link synthesized at probe time.

The driver synthesizes the fixed link directly in C using an of_changeset:
of_changeset_create_node() adds a "fixed-link" subnode onto the PCI
function's dynamic OF node (CONFIG_PCI_DYNAMIC_OF_NODES), with the "speed"
property read from PCR[PSPEED] at probe time and "full-duplex" set.
phylink then picks up the fixed-link node through dev_fwnode().

The series touches three subsystems:
  - net/enetc:  pseudo-MAC fixed-link support, probing of 4.4 devices
                and a fix for more than 6 ring interrupt vectors
  - arm64 dts:  NETC IEP18 ECAM node on S32N79 and its RDB board enable
  - PCI:        a quirk creating the OF node for the ENETC PMAC functions

Because this is primarily a networking feature and the pieces are
interdependent at runtime, it would be most convenient to merge the
whole series through the netdev tree.

Patch 1 has a runtime (not Kconfig) dependency on
CONFIG_PCI_DYNAMIC_OF_NODES; absent that, the pseudo-MAC probe path
fails gracefully with -ENODEV.

v4:
 - Patch 1: made NXP_ENETC4 depend on OF, as OF_DYNAMIC is only
   available with OF; improved the commit message.
 - Patch 2: new, allocates the int_vector array dynamically to prevent
   an out-of-bounds access on S32N79.
 - Patch 3: clarified the commit message.
 - Patches 4-6: no changes.
v3:
 - Patch 1: fixed the CONFIG_OF_DYNAMIC dependency, refactored
   enetc4_add_ppm_fixed_link() as per Wei's feedback, and improved the
   commit message.
 - Patch 3: added sysclk_freq info for the v4.4 ENETC devices.
 - Patches 4-6: no changes.
v2:
 - Switched the fixed-link patch from a DT overlay blob
   (of_overlay_fdt_apply() + a .dtso compiled to .dtbo) to
   of_changeset_create_node(), per review feedback. This drops the
   embedded overlay externs, the Makefile .dtbo wrapping, and the
   OF_OVERLAY Kconfig dependency. The operating speed is now baked
   directly into the changeset-created fixed-link node (read once from
   PCR[PSPEED] at probe time); the phylink get_fixed_state callback is
   no longer needed and was removed.
 - Described why there are two ENETC PF IDs in the commit message, as
   per review.
 - Replaced the 'msi-parent' stub property with 'msi-map', as per H/W
   spec.
 - Reworded the PCI patch commit message to match the fixed-link
   approach (no functional change); added Bjorn's Acked-by.
v1: initial submission.

Link: https://lore.kernel.org/netdev/cover.1793712309.git.claudiu.manoil@nxp.com/

Claudiu Manoil (6):
  net: enetc: Add pseudo-MAC support for ENETCv4 Ports via a fixed-link
    node
  net: enetc: Allocate int_vector array dynamically
  net: enetc: Enable probing of version 4.4 devices
  arm64: dts: s32n79: add NETC IEP18 ECAM node for ENETC PPM ports
  arm64: dts: s32n79-rdb: enable NETC IEP18
  PCI: Create OF node for NXP ENETC pseudo-MAC functions

 arch/arm64/boot/dts/freescale/s32n79-rdb.dts  |   4 +
 arch/arm64/boot/dts/freescale/s32n79.dtsi     |  24 ++++
 drivers/net/ethernet/freescale/enetc/Kconfig  |   2 +
 drivers/net/ethernet/freescale/enetc/enetc.c  |  34 ++++++
 drivers/net/ethernet/freescale/enetc/enetc.h  |   3 +-
 .../net/ethernet/freescale/enetc/enetc4_pf.c  | 109 +++++++++++++++++-
 .../net/ethernet/freescale/enetc/enetc_hw.h   |   4 +-
 .../net/ethernet/freescale/enetc/enetc_pf.h   |   2 +
 .../freescale/enetc/enetc_pf_common.c         |  41 ++++++-
 .../freescale/enetc/enetc_pf_common.h         |   1 +
 drivers/pci/quirks.c                          |   2 +
 11 files changed, 214 insertions(+), 12 deletions(-)

-- 
2.34.1

[PATCH net-next v4 1/6] net: enetc: Add pseudo-MAC support for ENETCv4 Ports via a fixed-link node

[Claudiu Manoil]

ENETCv4 has special internal links when connected to the on-chip NETC
switch via internal switch ports, called pseudo-MAC links. These
pseudo-MACs are proprietary, they don't implement any standard IEEE
interface (like MII), and can be modeled as fixed links with the link
speed determined at boot time by the Port PCR[PSPEED] register
configuration.

We also need to be able to probe the ENETCv4 Ports featuring pseudo-MACs
as pure PCI devices, i.e. without any "ethernet" DT node representation.
The typical use case for this consists in a board with NETC connected
via PCI to another host which probes the ENETC. Note that in this
scenario, the pseudo-MAC ENETCs are connected internally to a NETC
switch that is not owned by Linux.

Since such a port has no "ethernet" DT node, its fixed link has to be
synthesized at probe time. Build the fixed-link subnode directly in C
with an of_changeset: of_changeset_create_node() adds a "fixed-link"
node onto the port's own OF node, and of_changeset_add_prop_*() populate
its "speed" and "full-duplex" properties. The changeset is applied with
of_changeset_apply(), so the fixed-link node is spliced onto the ENETC
netdev's fwnode exactly as if it had come from static DT, and phylink
picks it up through dev_fwnode().

The operating speed written into the node is read from PCR[PSPEED] at
probe time and mapped to a phylink-supported value, so the fixed link
reflects the actual boot-time configuration, as long as it's a phylink
supported value. Otherwise, PCR[PSPEED] will be updated to the closest
rounded down supported value.

The pseudo-MAC path is selected when the port has no OF node, or when it
only has the empty PCI-synthesized node (OF_DYNAMIC), which carries no
fixed-link description. Ports described by static DT take the regular
of_get_phy_mode() path instead.

Building the fixed-link node requires the of_changeset API, which is only
available with CONFIG_OF_DYNAMIC, so select it. As OF_DYNAMIC itself
depends on OF, make NXP_ENETC4 depend on OF as well, rather than force
OF_DYNAMIC on without the core OF code being built.

The changeset is reverted and destroyed on teardown and on the probe
error unwind. The node-less pseudo-MAC path has a runtime dependency on
CONFIG_PCI_DYNAMIC_OF_NODES: that is what makes the PCI core synthesize
the per-function OF node (of_pci_make_dev_node()) that the fixed-link
node is attached onto. This is intentionally not a hard Kconfig
dependency, since the ENETC4 driver also serves regular ports described
by static DT; when PCI_DYNAMIC_OF_NODES is absent the PCI function has no
of_node and the pseudo-MAC probe path fails gracefully with a clear
-ENODEV error.

Signed-off-by: Claudiu Manoil <claudiu.manoil@nxp.com>
---
v4:
 - Made NXP_ENETC4 depend on OF, since OF_DYNAMIC (selected for the
   of_changeset API) is only available with OF; added to the commit
   message. Reported by the kernel test robot on v2 and in review.

v3:
 - Fixed the CONFIG_OF_DYNAMIC dependency.
 - Refactored enetc4_add_ppm_fixed_link(), as per Wei's feedback.
 - Improved the commit message.

v2:
 - Switched from a DT overlay blob (of_overlay_fdt_apply() + a .dtso
   compiled to .dtbo) to of_changeset_create_node(), per review
   feedback. Drops the embedded overlay externs, the Makefile .dtbo
   wrapping, and the OF_OVERLAY Kconfig dependency.
 - Baked the operating speed directly into the changeset-created
   fixed-link node (read once from PCR[PSPEED] at probe time); the
   phylink get_fixed_state callback is no longer needed and was removed.

 drivers/net/ethernet/freescale/enetc/Kconfig  |   2 +
 .../net/ethernet/freescale/enetc/enetc4_pf.c  | 109 +++++++++++++++++-
 .../net/ethernet/freescale/enetc/enetc_pf.h   |   2 +
 .../freescale/enetc/enetc_pf_common.c         |  41 ++++++-
 .../freescale/enetc/enetc_pf_common.h         |   1 +
 5 files changed, 146 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/freescale/enetc/Kconfig b/drivers/net/ethernet/freescale/enetc/Kconfig
index f425f82a6213..465c913683c8 100644
--- a/drivers/net/ethernet/freescale/enetc/Kconfig
+++ b/drivers/net/ethernet/freescale/enetc/Kconfig
@@ -49,12 +49,14 @@ config NXP_ENETC4
 	tristate "ENETC4 PF driver"
 	depends on PTP_1588_CLOCK_OPTIONAL
 	depends on PCI_MSI
+	depends on OF
 	select FSL_ENETC_CORE
 	select FSL_ENETC_MDIO
 	select NXP_ENETC_PF_COMMON
 	select NXP_NTMP
 	select PHYLINK
 	select DIMLIB
+	select OF_DYNAMIC
 	help
 	  This driver supports NXP ENETC devices with major revision 4. ENETC is
 	  as the NIC functionality in NETC, it supports virtualization/isolation
diff --git a/drivers/net/ethernet/freescale/enetc/enetc4_pf.c b/drivers/net/ethernet/freescale/enetc/enetc4_pf.c
index 71c971618388..b7e7201e6a71 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc4_pf.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc4_pf.c
@@ -1,8 +1,9 @@
 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
-/* Copyright 2024 NXP */
+/* Copyright 2024, 2026 NXP */
 
 #include <linux/clk.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/of_net.h>
 #include <linux/of_platform.h>
 #include <linux/unaligned.h>
@@ -932,6 +933,14 @@ static void enetc4_pl_mac_link_down(struct phylink_config *config,
 	enetc4_mac_tx_graceful_stop(pf);
 }
 
+static void enetc4_get_pcr_speed(struct enetc_hw *hw, int *speed)
+{
+	u32 val = enetc_port_rd(hw, ENETC4_PCR);
+	int pspeed = FIELD_GET(PCR_PSPEED, val);
+
+	*speed = (pspeed + 1) * 10;
+}
+
 static const struct phylink_mac_ops enetc_pl_mac_ops = {
 	.mac_select_pcs = enetc4_pl_mac_select_pcs,
 	.mac_config = enetc4_pl_mac_config,
@@ -946,23 +955,108 @@ static void enetc4_pci_remove(void *data)
 	enetc_pci_remove(pdev);
 }
 
+static void enetc4_put_ppm_fixed_link(struct enetc_pf *pf)
+{
+	if (!pf->ppm_ocs)
+		return;
+
+	of_changeset_revert(pf->ppm_ocs);
+	of_changeset_destroy(pf->ppm_ocs);
+	kfree(pf->ppm_ocs);
+	pf->ppm_ocs = NULL;
+}
+
+/* Pseudo-MAC ports have no real PHY; the link is fixed, with the operating
+ * speed set at probe time from PCR[PSPEED]. Describe this with a fixed-link
+ * subnode synthesized at runtime onto the port's own OF node, so phylink
+ * picks it up through dev_fwnode() exactly as if it came from static DT.
+ */
+static int enetc4_add_ppm_fixed_link(struct enetc_pf *pf,
+				     struct device_node *np)
+{
+	struct device_node *fixed_link;
+	struct of_changeset *ocs;
+	int speed, err;
+
+	enetc4_get_pcr_speed(&pf->si->hw, &speed);
+	speed = enetc_phylink_match_pseudo_mac_speed(speed);
+
+	ocs = kzalloc_obj(*ocs);
+	if (!ocs)
+		return -ENOMEM;
+
+	of_changeset_init(ocs);
+
+	fixed_link = of_changeset_create_node(ocs, np, "fixed-link");
+	if (!fixed_link) {
+		err = -ENOMEM;
+		goto err_destroy;
+	}
+
+	err = of_changeset_add_prop_u32(ocs, fixed_link, "speed", speed);
+	if (err)
+		goto err_put_node;
+
+	err = of_changeset_add_prop_bool(ocs, fixed_link, "full-duplex");
+	if (err)
+		goto err_put_node;
+
+	err = of_changeset_apply(ocs);
+	if (err)
+		goto err_put_node;
+
+	of_node_put(fixed_link);
+	pf->ppm_ocs = ocs;
+
+	return 0;
+
+err_put_node:
+	of_node_put(fixed_link);
+err_destroy:
+	of_changeset_destroy(ocs);
+	kfree(ocs);
+
+	return err;
+}
+
 static int enetc4_link_init(struct enetc_ndev_priv *priv,
 			    struct device_node *node)
 {
+	bool dynamic = node && of_node_check_flag(node, OF_DYNAMIC);
 	struct enetc_pf *pf = enetc_si_priv(priv->si);
 	struct device *dev = priv->dev;
 	int err;
 
-	err = of_get_phy_mode(node, &pf->if_mode);
-	if (err) {
-		dev_err(dev, "Failed to get PHY mode\n");
-		return err;
+	/* Pseudo-MAC ENETCs are described by a runtime-synthesized fixed-link
+	 * node rather than static DT. This covers both a missing OF node and a
+	 * PCI-synthesized (OF_DYNAMIC) node, which is an empty node created
+	 * by the PCI core and thus carries no fixed-link description.
+	 */
+	if (enetc_is_pseudo_mac(priv->si) && (!node || dynamic)) {
+		pf->if_mode = PHY_INTERFACE_MODE_INTERNAL;
+
+		if (!node) {
+			dev_err(dev, "Missing of_node for Pseudo-MAC port\n");
+			return -ENODEV;
+		}
+
+		err = enetc4_add_ppm_fixed_link(pf, node);
+		if (err) {
+			dev_err(dev, "Failed to add fixed-link node\n");
+			return err;
+		}
+	} else {
+		err = of_get_phy_mode(node, &pf->if_mode);
+		if (err) {
+			dev_err(dev, "Failed to get PHY mode\n");
+			return err;
+		}
 	}
 
 	err = enetc_mdiobus_create(pf, node);
 	if (err) {
 		dev_err(dev, "Failed to create MDIO bus\n");
-		return err;
+		goto err_mdiobus_create;
 	}
 
 	err = enetc_phylink_create(priv, node, &enetc_pl_mac_ops);
@@ -975,6 +1069,8 @@ static int enetc4_link_init(struct enetc_ndev_priv *priv,
 
 err_phylink_create:
 	enetc_mdiobus_destroy(pf);
+err_mdiobus_create:
+	enetc4_put_ppm_fixed_link(pf);
 
 	return err;
 }
@@ -985,6 +1081,7 @@ static void enetc4_link_deinit(struct enetc_ndev_priv *priv)
 
 	enetc_phylink_destroy(priv);
 	enetc_mdiobus_destroy(pf);
+	enetc4_put_ppm_fixed_link(pf);
 }
 
 static void enetc4_pf_link_status_task(struct work_struct *work)
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_pf.h b/drivers/net/ethernet/freescale/enetc/enetc_pf.h
index 1f92d16d8ca8..ab11e40cfdbb 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_pf.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc_pf.h
@@ -67,6 +67,8 @@ struct enetc_pf {
 	bool sriov_enabled;
 	bool link_up;
 	u16 link_status_ms_mask;
+
+	struct of_changeset *ppm_ocs; /* pseudo-MAC fixed-link changeset */
 };
 
 #define phylink_to_enetc_pf(config) \
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c b/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c
index 8facc8bf8693..b032b586f07b 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c
@@ -436,6 +436,43 @@ void enetc_mdiobus_destroy(struct enetc_pf *pf)
 }
 EXPORT_SYMBOL_GPL(enetc_mdiobus_destroy);
 
+static struct {
+	unsigned long mac_cap;
+	int speed; /* descending order sorted  */
+} enetc_phylink_pseudo_mac_caps[] = {
+	{ MAC_25000FD,  SPEED_25000 },
+	{ MAC_20000FD,  SPEED_20000 },
+	{ MAC_10000FD,  SPEED_10000 },
+	{ MAC_5000FD,   SPEED_5000  },
+	{ MAC_2500FD,   SPEED_2500  },
+	{ MAC_1000FD,   SPEED_1000  },
+	{ MAC_100FD,    SPEED_100   },
+	{ MAC_10FD,     SPEED_10    },
+};
+
+static unsigned long enetc_phylink_get_pseudo_mac_caps(void)
+{
+	unsigned long mac_caps = 0;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(enetc_phylink_pseudo_mac_caps); i++)
+		mac_caps |= enetc_phylink_pseudo_mac_caps[i].mac_cap;
+
+	return mac_caps;
+}
+
+int enetc_phylink_match_pseudo_mac_speed(int speed)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(enetc_phylink_pseudo_mac_caps); i++)
+		if (enetc_phylink_pseudo_mac_caps[i].speed <= speed)
+			return enetc_phylink_pseudo_mac_caps[i].speed;
+
+	return SPEED_UNKNOWN;
+}
+EXPORT_SYMBOL_GPL(enetc_phylink_match_pseudo_mac_speed);
+
 int enetc_phylink_create(struct enetc_ndev_priv *priv, struct device_node *node,
 			 const struct phylink_mac_ops *ops)
 {
@@ -471,9 +508,7 @@ int enetc_phylink_create(struct enetc_ndev_priv *priv, struct device_node *node,
 
 		phy_interface_set_rgmii(pf->phylink_config.supported_interfaces);
 	} else {
-		mac_caps |= MAC_10FD | MAC_100FD | MAC_1000FD | MAC_2500FD |
-			    MAC_5000FD | MAC_10000FD | MAC_20000FD |
-			    MAC_25000FD;
+		mac_caps |= enetc_phylink_get_pseudo_mac_caps();
 	}
 
 	pf->phylink_config.mac_capabilities = mac_caps;
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_pf_common.h b/drivers/net/ethernet/freescale/enetc/enetc_pf_common.h
index c9eed879d5a3..aede1aad6362 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_pf_common.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc_pf_common.h
@@ -13,6 +13,7 @@ void enetc_mdiobus_destroy(struct enetc_pf *pf);
 int enetc_phylink_create(struct enetc_ndev_priv *priv, struct device_node *node,
 			 const struct phylink_mac_ops *ops);
 void enetc_phylink_destroy(struct enetc_ndev_priv *priv);
+int enetc_phylink_match_pseudo_mac_speed(int speed);
 void enetc_set_default_rss_key(struct enetc_pf *pf);
 int enetc_vlan_rx_add_vid(struct net_device *ndev, __be16 prot, u16 vid);
 int enetc_vlan_rx_del_vid(struct net_device *ndev, __be16 prot, u16 vid);
-- 
2.34.1

[PATCH net-next v4 2/6] net: enetc: Allocate int_vector array dynamically

[Claudiu Manoil]

The number of Rx/Tx ring interrupt vectors, priv->bdr_int_num, is set
in enetc_init_si_rings_params() to the lesser of the number of online
CPUs and the number of Rx rings of the station interface. The
int_vector[] array in struct enetc_ndev_priv, however, has a fixed
size of ENETC_MAX_BDR_INT (6), a limit that dates back to the maximum
CPU count of the SoCs integrating ENETC at the time.

That assumption does not hold for S32N79, which has 8 CPUs and gives
the ENETC PF up to 8 Rx rings. There, bdr_int_num can reach 8, and
enetc_alloc_msix() writes priv->int_vector[i] past the end of the
array, corrupting the adjacent fields of the netdev private area.
No SoC currently supported upstream exceeds 6 vectors, so this is not
reachable today; it must be fixed before S32N79 devices can be enabled
by a following patch.

Allocate int_vector[] with devm_kcalloc() in enetc_alloc_msix(), once
bdr_int_num is known. The memory is released together with the PCI
device, so no explicit free is needed on the error or teardown paths.
This is common code, so the PF and VF drivers benefit alike. Drop the
ENETC_MAX_BDR_INT define, which only existed to size this array.

Signed-off-by: Claudiu Manoil <claudiu.manoil@nxp.com>
---
v4:
 - New patch. Prevents an out-of-bounds access to priv->int_vector[]
   when bdr_int_num exceeds 6, as is the case on S32N79, as requested
   in review.

 drivers/net/ethernet/freescale/enetc/enetc.c | 8 ++++++++
 drivers/net/ethernet/freescale/enetc/enetc.h | 3 +--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
index c6571b5cc842..855b2d3b8718 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc.c
@@ -3641,6 +3641,13 @@ int enetc_alloc_msix(struct enetc_ndev_priv *priv)
 	if (n != nvec)
 		return -EPERM;
 
+	priv->int_vector = devm_kcalloc(&pdev->dev, priv->bdr_int_num,
+					sizeof(*priv->int_vector), GFP_KERNEL);
+	if (!priv->int_vector) {
+		err = -ENOMEM;
+		goto fail_int_vector;
+	}
+
 	/* # of tx rings per int vector */
 	v_tx_rings = priv->num_tx_rings / priv->bdr_int_num;
 	v_remainder = priv->num_tx_rings % priv->bdr_int_num;
@@ -3676,6 +3683,7 @@ int enetc_alloc_msix(struct enetc_ndev_priv *priv)
 	while (i--)
 		enetc_int_vector_destroy(priv, i);
 
+fail_int_vector:
 	pci_free_irq_vectors(pdev);
 
 	return err;
diff --git a/drivers/net/ethernet/freescale/enetc/enetc.h b/drivers/net/ethernet/freescale/enetc/enetc.h
index d9e91832a9c1..689ad82b2949 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc.h
@@ -407,7 +407,6 @@ struct enetc_cls_rule {
 	int used;
 };
 
-#define ENETC_MAX_BDR_INT	6 /* fixed to max # of available cpus */
 struct psfp_cap {
 	u32 max_streamid;
 	u32 max_psfp_filter;
@@ -456,7 +455,7 @@ struct enetc_ndev_priv {
 	struct enetc_si *si;
 
 	int bdr_int_num; /* number of Rx/Tx ring interrupts */
-	struct enetc_int_vector *int_vector[ENETC_MAX_BDR_INT];
+	struct enetc_int_vector **int_vector;
 	u16 num_rx_rings, num_tx_rings;
 	u16 rx_bd_count, tx_bd_count;
 
-- 
2.34.1

[PATCH net-next v4 3/6] net: enetc: Enable probing of version 4.4 devices

[Claudiu Manoil]

This commit adds driver data and platform info entries for ENETC v4.4 PF
and VF devices on S32N79 SoCs with a 500 MHz system clock frequency.

The ENETC v4.4 devices are present on S32N79 SoCs and feature only
Pseudo-MAC ENETC ports, whose PFs use either the 0xe101 or the 0xe110
PCI device ID, and the VFs answer to the usual device ID of 0xef00.

While the ENETC PF instances are usually designated by the 0xe101 ID,
in newer IP versions the 0xe110 ID was introduced to indicate the
power-on reset default NETC switch management interface. These IDs
do not indicate any functional difference between the designated
ENETC instances, and can be interchanged and re-assigned at boot time
(i.e. from firmware).

Signed-off-by: Claudiu Manoil <claudiu.manoil@nxp.com>
---
v4:
 - Added a leading sentence to the commit message, stating that the
   patch adds driver data and platform info entries for ENETC v4.4
   devices with a 500 MHz system clock frequency.

v3:
 - Added sysclk_freq info for the v4.4 ENETC devices.

v2:
 - Described why there are two ENETC PF IDs in the commit message, as per
   review.

 drivers/net/ethernet/freescale/enetc/enetc.c  | 26 +++++++++++++++++++
 .../net/ethernet/freescale/enetc/enetc_hw.h   |  4 ++-
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
index 855b2d3b8718..e3aa117d323d 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc.c
@@ -3840,6 +3840,20 @@ static const struct enetc_drvdata enetc4_vf_data = {
 	.eth_ops = &enetc_vf_ethtool_ops,
 };
 
+static const struct enetc_drvdata enetc4_s32n79_ppm_data = {
+	.sysclk_freq = ENETC_CLK_500M,
+	.tx_csum = true,
+	.max_frags = ENETC4_MAX_SKB_FRAGS,
+	.eth_ops = &enetc4_ppm_ethtool_ops,
+};
+
+static const struct enetc_drvdata enetc4_s32n79_vf_data = {
+	.sysclk_freq = ENETC_CLK_500M,
+	.tx_csum = true,
+	.max_frags = ENETC4_MAX_SKB_FRAGS,
+	.eth_ops = &enetc_vf_ethtool_ops,
+};
+
 static const struct enetc_platform_info enetc_info[] = {
 	{ .revision = ENETC_REV_1_0,
 	  .dev_id = ENETC_DEV_ID_PF,
@@ -3870,6 +3884,18 @@ static const struct enetc_platform_info enetc_info[] = {
 	  .dev_id = NXP_ENETC_VF_DEV_ID,
 	  .data = &enetc4_vf_data,
 	},
+	{ .revision = ENETC_REV_4_4,
+	  .dev_id = NXP_ENETC_PPM_DEV_ID,
+	  .data = &enetc4_s32n79_ppm_data,
+	},
+	{ .revision = ENETC_REV_4_4,
+	  .dev_id = NXP_ENETC_PF_DEV_ID,
+	  .data = &enetc4_s32n79_ppm_data,
+	},
+	{ .revision = ENETC_REV_4_4,
+	  .dev_id = NXP_ENETC_VF_DEV_ID,
+	  .data = &enetc4_s32n79_vf_data,
+	},
 };
 
 int enetc_get_driver_data(struct enetc_si *si)
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_hw.h b/drivers/net/ethernet/freescale/enetc/enetc_hw.h
index 2c9d9042eb0b..8e6a9d366d40 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_hw.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc_hw.h
@@ -414,6 +414,7 @@ enum enetc_bdr_type {TX, RX};
 #define ENETC_REV_1_0		0x0100
 #define ENETC_REV_4_1		0X0401
 #define ENETC_REV_4_3		0x0403
+#define ENETC_REV_4_4		0x0404
 
 #define ENETC_G_EIPBRR1		0x0bfc
 #define ENETC_G_EPFBLPR(n)	(0xd00 + 4 * (n))
@@ -1048,8 +1049,9 @@ struct enetc_cbd {
 	u8 status_flags;
 };
 
-#define ENETC_CLK_400M		400000000ULL
 #define ENETC_CLK_333M		333000000ULL
+#define ENETC_CLK_400M		400000000ULL
+#define ENETC_CLK_500M		500000000ULL
 
 static inline u32 enetc_cycles_to_usecs(u32 cycles, u64 clk_freq)
 {
-- 
2.34.1

[PATCH net-next v4 4/6] arm64: dts: s32n79: add NETC IEP18 ECAM node for ENETC PPM ports

[Claudiu Manoil]

Add the netc_iep18 PCIe ECAM host node describing the NETC integrated
endpoint bus allocated to the first Linux cohort on S32N79. The bus is
enumerated via the generic pci-host-ecam-generic driver and hosts the
ENETC v4 Pseudo-MAC (PPM) PF and its VFs, which connect internally to
the on-chip NETC switch (not owned by Linux).

The node is kept disabled at the SoC level; boards that wire up NETC
enable it. MSIs are routed through the GIC-v3 ITS (msi-map) and DMA is
translated by the SMMUv3 (iommu-map).

Signed-off-by: Claudiu Manoil <claudiu.manoil@nxp.com>
---
v4: none
v3: none

v2:
 - Replaced the 'msi-parent' stub property with 'msi-map', as per H/W spec.

 arch/arm64/boot/dts/freescale/s32n79.dtsi | 24 +++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/s32n79.dtsi b/arch/arm64/boot/dts/freescale/s32n79.dtsi
index 94ab58783fdc..65cf65e82832 100644
--- a/arch/arm64/boot/dts/freescale/s32n79.dtsi
+++ b/arch/arm64/boot/dts/freescale/s32n79.dtsi
@@ -122,6 +122,30 @@ irqsteer_coss: interrupt-controller@4ed00000 {
 		};
 	};
 
+	nwss-bus {
+		compatible = "simple-bus";
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges = <0x0 0x48800000 0x0 0x48800000 0x0 0x4b0000>,
+			 <0x2 0x40000000 0x2 0x40000000 0x0 0x20000000>;
+
+		netc_iep18: pcie@241200000 {
+			compatible = "pci-host-ecam-generic";
+			reg = <0x2 0x41200000 0x0 0x100000>;
+			#address-cells = <3>;
+			#size-cells = <2>;
+			device_type = "pci";
+			bus-range = <0x0 0x0>;
+			iommu-map = <0x0 &smmu 0xc0000 0x100>;
+			msi-map = <0x0 &its 0xc0000 0x100>;
+			dma-coherent;
+			status = "disabled";
+
+			/* All NETC PCIe functions */
+			ranges = <0x82000000 0x0 0x48800000 0x0 0x48800000 0x0 0x4b0000>;
+		};
+	};
+
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;
-- 
2.34.1

[PATCH net-next v4 5/6] arm64: dts: s32n79-rdb: enable NETC IEP18

[Claudiu Manoil]

Enable the NETC v4 ECAM bus #18 on the S32N79-RDB board so that the
ENETC v4 Pseudo-MAC port (PPM) PF and VF instances are probed.

Signed-off-by: Claudiu Manoil <claudiu.manoil@nxp.com>
---
v4: none
v3: none
v2: none

 arch/arm64/boot/dts/freescale/s32n79-rdb.dts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/s32n79-rdb.dts b/arch/arm64/boot/dts/freescale/s32n79-rdb.dts
index 1feccd61258e..897ba24ac03a 100644
--- a/arch/arm64/boot/dts/freescale/s32n79-rdb.dts
+++ b/arch/arm64/boot/dts/freescale/s32n79-rdb.dts
@@ -68,3 +68,7 @@ &usdhc0 {
 	no-sdio;
 	status = "okay";
 };
+
+&netc_iep18 {
+	status = "okay";
+};
-- 
2.34.1

[PATCH net-next v4 6/6] PCI: Create OF node for NXP ENETC pseudo-MAC functions

[Claudiu Manoil]

NXP ENETCv4 pseudo-MAC (PPM) ports can be probed as pure PCI endpoints,
without any "ethernet" node in the static device tree. The ENETC4 driver
describes their fixed link by attaching a fixed-link node to the PCI
function's own OF node, which requires that node to exist.

Request the PCI core to synthesize a per-function OF node for these
devices by registering of_pci_make_dev_node() as a final fixup, following
the existing precedent for the Xilinx, Red Hat and EFAR devices. The
helper is a no-op when the function already has a static OF node, so this
has no effect on platforms that describe ENETC via static DT. It only
takes effect when CONFIG_PCI_DYNAMIC_OF_NODES is enabled.

Both ENETC4 PCI device IDs are covered (0xe101 and 0xe110), since either
can be instantiated as a pseudo-MAC port on S32N79.

Signed-off-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
---
v4: none
v3: none
v2: none (reworded the overlay reference to match patch 1's fixed-link
    approach; no functional change)

 drivers/pci/quirks.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 7f1f47ea2ee4..71f272d8a296 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -6563,6 +6563,8 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_XILINX, 0x5021, of_pci_make_dev_node);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_REDHAT, 0x0005, of_pci_make_dev_node);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_EFAR, 0x9660, of_pci_make_dev_node);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_TOSHIBA, 0x0220, of_pci_make_dev_node);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_PHILIPS, 0xe101, of_pci_make_dev_node);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_PHILIPS, 0xe110, of_pci_make_dev_node);
 
 /*
  * Devices known to require a longer delay before first config space access
-- 
2.34.1