Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 488 insertions, 0 deletions

diff --git a/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c b/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c
new file mode 100644
index 000000000..d0fec82f0
--- /dev/null
+++ b/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c
@@ -0,0 +1,488 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/*
+ * Copyright 2020 NXP
+ */
+
+#include <linux/firmware/imx/svc/misc.h>
+#include <linux/media-bus-format.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+
+#include <drm/drm_atomic_state_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_of.h>
+#include <drm/drm_print.h>
+
+#include <dt-bindings/firmware/imx/rsrc.h>
+
+#define PXL2DPI_CTRL	0x40
+#define  CFG1_16BIT	0x0
+#define  CFG2_16BIT	0x1
+#define  CFG3_16BIT	0x2
+#define  CFG1_18BIT	0x3
+#define  CFG2_18BIT	0x4
+#define  CFG_24BIT	0x5
+
+#define DRIVER_NAME	"imx8qxp-pxl2dpi"
+
+struct imx8qxp_pxl2dpi {
+	struct regmap *regmap;
+	struct drm_bridge bridge;
+	struct drm_bridge *next_bridge;
+	struct drm_bridge *companion;
+	struct device *dev;
+	struct imx_sc_ipc *ipc_handle;
+	u32 sc_resource;
+	u32 in_bus_format;
+	u32 out_bus_format;
+	u32 pl_sel;
+};
+
+#define bridge_to_p2d(b)	container_of(b, struct imx8qxp_pxl2dpi, bridge)
+
+static int imx8qxp_pxl2dpi_bridge_attach(struct drm_bridge *bridge,
+					 enum drm_bridge_attach_flags flags)
+{
+	struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
+
+	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
+		DRM_DEV_ERROR(p2d->dev,
+			      "do not support creating a drm_connector\n");
+		return -EINVAL;
+	}
+
+	if (!bridge->encoder) {
+		DRM_DEV_ERROR(p2d->dev, "missing encoder\n");
+		return -ENODEV;
+	}
+
+	return drm_bridge_attach(bridge->encoder,
+				 p2d->next_bridge, bridge,
+				 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
+}
+
+static int
+imx8qxp_pxl2dpi_bridge_atomic_check(struct drm_bridge *bridge,
+				    struct drm_bridge_state *bridge_state,
+				    struct drm_crtc_state *crtc_state,
+				    struct drm_connector_state *conn_state)
+{
+	struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
+
+	p2d->in_bus_format = bridge_state->input_bus_cfg.format;
+	p2d->out_bus_format = bridge_state->output_bus_cfg.format;
+
+	return 0;
+}
+
+static void
+imx8qxp_pxl2dpi_bridge_mode_set(struct drm_bridge *bridge,
+				const struct drm_display_mode *mode,
+				const struct drm_display_mode *adjusted_mode)
+{
+	struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
+	struct imx8qxp_pxl2dpi *companion_p2d;
+	int ret;
+
+	ret = pm_runtime_get_sync(p2d->dev);
+	if (ret < 0)
+		DRM_DEV_ERROR(p2d->dev,
+			      "failed to get runtime PM sync: %d\n", ret);
+
+	ret = imx_sc_misc_set_control(p2d->ipc_handle, p2d->sc_resource,
+				      IMX_SC_C_PXL_LINK_SEL, p2d->pl_sel);
+	if (ret)
+		DRM_DEV_ERROR(p2d->dev,
+			      "failed to set pixel link selection(%u): %d\n",
+							p2d->pl_sel, ret);
+
+	switch (p2d->out_bus_format) {
+	case MEDIA_BUS_FMT_RGB888_1X24:
+		regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG_24BIT);
+		break;
+	case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
+		regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG2_18BIT);
+		break;
+	default:
+		DRM_DEV_ERROR(p2d->dev,
+			      "unsupported output bus format 0x%08x\n",
+							p2d->out_bus_format);
+	}
+
+	if (p2d->companion) {
+		companion_p2d = bridge_to_p2d(p2d->companion);
+
+		companion_p2d->in_bus_format = p2d->in_bus_format;
+		companion_p2d->out_bus_format = p2d->out_bus_format;
+
+		p2d->companion->funcs->mode_set(p2d->companion, mode,
+							adjusted_mode);
+	}
+}
+
+static void
+imx8qxp_pxl2dpi_bridge_atomic_disable(struct drm_bridge *bridge,
+				      struct drm_bridge_state *old_bridge_state)
+{
+	struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
+	int ret;
+
+	ret = pm_runtime_put(p2d->dev);
+	if (ret < 0)
+		DRM_DEV_ERROR(p2d->dev, "failed to put runtime PM: %d\n", ret);
+
+	if (p2d->companion)
+		p2d->companion->funcs->atomic_disable(p2d->companion,
+							old_bridge_state);
+}
+
+static const u32 imx8qxp_pxl2dpi_bus_output_fmts[] = {
+	MEDIA_BUS_FMT_RGB888_1X24,
+	MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
+};
+
+static bool imx8qxp_pxl2dpi_bus_output_fmt_supported(u32 fmt)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts); i++) {
+		if (imx8qxp_pxl2dpi_bus_output_fmts[i] == fmt)
+			return true;
+	}
+
+	return false;
+}
+
+static u32 *
+imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
+						 struct drm_bridge_state *bridge_state,
+						 struct drm_crtc_state *crtc_state,
+						 struct drm_connector_state *conn_state,
+						 u32 output_fmt,
+						 unsigned int *num_input_fmts)
+{
+	u32 *input_fmts;
+
+	if (!imx8qxp_pxl2dpi_bus_output_fmt_supported(output_fmt))
+		return NULL;
+
+	*num_input_fmts = 1;
+
+	input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
+	if (!input_fmts)
+		return NULL;
+
+	switch (output_fmt) {
+	case MEDIA_BUS_FMT_RGB888_1X24:
+		input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X36_CPADLO;
+		break;
+	case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
+		input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X36_CPADLO;
+		break;
+	default:
+		kfree(input_fmts);
+		input_fmts = NULL;
+		break;
+	}
+
+	return input_fmts;
+}
+
+static u32 *
+imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
+						  struct drm_bridge_state *bridge_state,
+						  struct drm_crtc_state *crtc_state,
+						  struct drm_connector_state *conn_state,
+						  unsigned int *num_output_fmts)
+{
+	*num_output_fmts = ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts);
+	return kmemdup(imx8qxp_pxl2dpi_bus_output_fmts,
+			sizeof(imx8qxp_pxl2dpi_bus_output_fmts), GFP_KERNEL);
+}
+
+static const struct drm_bridge_funcs imx8qxp_pxl2dpi_bridge_funcs = {
+	.atomic_duplicate_state	= drm_atomic_helper_bridge_duplicate_state,
+	.atomic_destroy_state	= drm_atomic_helper_bridge_destroy_state,
+	.atomic_reset		= drm_atomic_helper_bridge_reset,
+	.attach			= imx8qxp_pxl2dpi_bridge_attach,
+	.atomic_check		= imx8qxp_pxl2dpi_bridge_atomic_check,
+	.mode_set		= imx8qxp_pxl2dpi_bridge_mode_set,
+	.atomic_disable		= imx8qxp_pxl2dpi_bridge_atomic_disable,
+	.atomic_get_input_bus_fmts =
+			imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts,
+	.atomic_get_output_bus_fmts =
+			imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts,
+};
+
+static struct device_node *
+imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi *p2d,
+					   u32 port_id)
+{
+	struct device_node *port, *ep;
+	int ep_cnt;
+
+	port = of_graph_get_port_by_id(p2d->dev->of_node, port_id);
+	if (!port) {
+		DRM_DEV_ERROR(p2d->dev, "failed to get port@%u\n", port_id);
+		return ERR_PTR(-ENODEV);
+	}
+
+	ep_cnt = of_get_available_child_count(port);
+	if (ep_cnt == 0) {
+		DRM_DEV_ERROR(p2d->dev, "no available endpoints of port@%u\n",
+			      port_id);
+		ep = ERR_PTR(-ENODEV);
+		goto out;
+	} else if (ep_cnt > 1) {
+		DRM_DEV_ERROR(p2d->dev,
+			      "invalid available endpoints of port@%u\n",
+			      port_id);
+		ep = ERR_PTR(-EINVAL);
+		goto out;
+	}
+
+	ep = of_get_next_available_child(port, NULL);
+	if (!ep) {
+		DRM_DEV_ERROR(p2d->dev,
+			      "failed to get available endpoint of port@%u\n",
+			      port_id);
+		ep = ERR_PTR(-ENODEV);
+		goto out;
+	}
+out:
+	of_node_put(port);
+	return ep;
+}
+
+static struct drm_bridge *
+imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi *p2d)
+{
+	struct device_node *ep, *remote;
+	struct drm_bridge *next_bridge;
+	int ret;
+
+	ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 1);
+	if (IS_ERR(ep)) {
+		ret = PTR_ERR(ep);
+		return ERR_PTR(ret);
+	}
+
+	remote = of_graph_get_remote_port_parent(ep);
+	if (!remote || !of_device_is_available(remote)) {
+		DRM_DEV_ERROR(p2d->dev, "no available remote\n");
+		next_bridge = ERR_PTR(-ENODEV);
+		goto out;
+	} else if (!of_device_is_available(remote->parent)) {
+		DRM_DEV_ERROR(p2d->dev, "remote parent is not available\n");
+		next_bridge = ERR_PTR(-ENODEV);
+		goto out;
+	}
+
+	next_bridge = of_drm_find_bridge(remote);
+	if (!next_bridge) {
+		next_bridge = ERR_PTR(-EPROBE_DEFER);
+		goto out;
+	}
+out:
+	of_node_put(remote);
+	of_node_put(ep);
+
+	return next_bridge;
+}
+
+static int imx8qxp_pxl2dpi_set_pixel_link_sel(struct imx8qxp_pxl2dpi *p2d)
+{
+	struct device_node *ep;
+	struct of_endpoint endpoint;
+	int ret;
+
+	ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 0);
+	if (IS_ERR(ep))
+		return PTR_ERR(ep);
+
+	ret = of_graph_parse_endpoint(ep, &endpoint);
+	if (ret) {
+		DRM_DEV_ERROR(p2d->dev,
+			      "failed to parse endpoint of port@0: %d\n", ret);
+		goto out;
+	}
+
+	p2d->pl_sel = endpoint.id;
+out:
+	of_node_put(ep);
+
+	return ret;
+}
+
+static int imx8qxp_pxl2dpi_parse_dt_companion(struct imx8qxp_pxl2dpi *p2d)
+{
+	struct imx8qxp_pxl2dpi *companion_p2d;
+	struct device *dev = p2d->dev;
+	struct device_node *companion;
+	struct device_node *port1, *port2;
+	const struct of_device_id *match;
+	int dual_link;
+	int ret = 0;
+
+	/* Locate the companion PXL2DPI for dual-link operation, if any. */
+	companion = of_parse_phandle(dev->of_node, "fsl,companion-pxl2dpi", 0);
+	if (!companion)
+		return 0;
+
+	if (!of_device_is_available(companion)) {
+		DRM_DEV_ERROR(dev, "companion PXL2DPI is not available\n");
+		ret = -ENODEV;
+		goto out;
+	}
+
+	/*
+	 * Sanity check: the companion bridge must have the same compatible
+	 * string.
+	 */
+	match = of_match_device(dev->driver->of_match_table, dev);
+	if (!of_device_is_compatible(companion, match->compatible)) {
+		DRM_DEV_ERROR(dev, "companion PXL2DPI is incompatible\n");
+		ret = -ENXIO;
+		goto out;
+	}
+
+	p2d->companion = of_drm_find_bridge(companion);
+	if (!p2d->companion) {
+		ret = -EPROBE_DEFER;
+		DRM_DEV_DEBUG_DRIVER(p2d->dev,
+				     "failed to find companion bridge: %d\n",
+				     ret);
+		goto out;
+	}
+
+	companion_p2d = bridge_to_p2d(p2d->companion);
+
+	/*
+	 * We need to work out if the sink is expecting us to function in
+	 * dual-link mode.  We do this by looking at the DT port nodes that
+	 * the next bridges are connected to.  If they are marked as expecting
+	 * even pixels and odd pixels than we need to use the companion PXL2DPI.
+	 */
+	port1 = of_graph_get_port_by_id(p2d->next_bridge->of_node, 1);
+	port2 = of_graph_get_port_by_id(companion_p2d->next_bridge->of_node, 1);
+	dual_link = drm_of_lvds_get_dual_link_pixel_order(port1, port2);
+	of_node_put(port1);
+	of_node_put(port2);
+
+	if (dual_link < 0) {
+		ret = dual_link;
+		DRM_DEV_ERROR(dev, "failed to get dual link pixel order: %d\n",
+			      ret);
+		goto out;
+	}
+
+	DRM_DEV_DEBUG_DRIVER(dev,
+			     "dual-link configuration detected (companion bridge %pOF)\n",
+			     companion);
+out:
+	of_node_put(companion);
+	return ret;
+}
+
+static int imx8qxp_pxl2dpi_bridge_probe(struct platform_device *pdev)
+{
+	struct imx8qxp_pxl2dpi *p2d;
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	int ret;
+
+	p2d = devm_kzalloc(dev, sizeof(*p2d), GFP_KERNEL);
+	if (!p2d)
+		return -ENOMEM;
+
+	p2d->regmap = syscon_node_to_regmap(np->parent);
+	if (IS_ERR(p2d->regmap)) {
+		ret = PTR_ERR(p2d->regmap);
+		if (ret != -EPROBE_DEFER)
+			DRM_DEV_ERROR(dev, "failed to get regmap: %d\n", ret);
+		return ret;
+	}
+
+	ret = imx_scu_get_handle(&p2d->ipc_handle);
+	if (ret) {
+		if (ret != -EPROBE_DEFER)
+			DRM_DEV_ERROR(dev, "failed to get SCU ipc handle: %d\n",
+				      ret);
+		return ret;
+	}
+
+	p2d->dev = dev;
+
+	ret = of_property_read_u32(np, "fsl,sc-resource", &p2d->sc_resource);
+	if (ret) {
+		DRM_DEV_ERROR(dev, "failed to get SC resource %d\n", ret);
+		return ret;
+	}
+
+	p2d->next_bridge = imx8qxp_pxl2dpi_find_next_bridge(p2d);
+	if (IS_ERR(p2d->next_bridge)) {
+		ret = PTR_ERR(p2d->next_bridge);
+		if (ret != -EPROBE_DEFER)
+			DRM_DEV_ERROR(dev, "failed to find next bridge: %d\n",
+				      ret);
+		return ret;
+	}
+
+	ret = imx8qxp_pxl2dpi_set_pixel_link_sel(p2d);
+	if (ret)
+		return ret;
+
+	ret = imx8qxp_pxl2dpi_parse_dt_companion(p2d);
+	if (ret)
+		return ret;
+
+	platform_set_drvdata(pdev, p2d);
+	pm_runtime_enable(dev);
+
+	p2d->bridge.driver_private = p2d;
+	p2d->bridge.funcs = &imx8qxp_pxl2dpi_bridge_funcs;
+	p2d->bridge.of_node = np;
+
+	drm_bridge_add(&p2d->bridge);
+
+	return ret;
+}
+
+static int imx8qxp_pxl2dpi_bridge_remove(struct platform_device *pdev)
+{
+	struct imx8qxp_pxl2dpi *p2d = platform_get_drvdata(pdev);
+
+	drm_bridge_remove(&p2d->bridge);
+
+	pm_runtime_disable(&pdev->dev);
+
+	return 0;
+}
+
+static const struct of_device_id imx8qxp_pxl2dpi_dt_ids[] = {
+	{ .compatible = "fsl,imx8qxp-pxl2dpi", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx8qxp_pxl2dpi_dt_ids);
+
+static struct platform_driver imx8qxp_pxl2dpi_bridge_driver = {
+	.probe	= imx8qxp_pxl2dpi_bridge_probe,
+	.remove = imx8qxp_pxl2dpi_bridge_remove,
+	.driver	= {
+		.of_match_table = imx8qxp_pxl2dpi_dt_ids,
+		.name = DRIVER_NAME,
+	},
+};
+module_platform_driver(imx8qxp_pxl2dpi_bridge_driver);
+
+MODULE_DESCRIPTION("i.MX8QXP pixel link to DPI bridge driver");
+MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRIVER_NAME);