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, 504 insertions, 0 deletions

diff --git a/drivers/media/platform/cadence/cdns-csi2rx.c b/drivers/media/platform/cadence/cdns-csi2rx.c
new file mode 100644
index 000000000..cc3ebb0d9
--- /dev/null
+++ b/drivers/media/platform/cadence/cdns-csi2rx.c
@@ -0,0 +1,504 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Driver for Cadence MIPI-CSI2 RX Controller v1.3
+ *
+ * Copyright (C) 2017 Cadence Design Systems Inc.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_graph.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-subdev.h>
+
+#define CSI2RX_DEVICE_CFG_REG			0x000
+
+#define CSI2RX_SOFT_RESET_REG			0x004
+#define CSI2RX_SOFT_RESET_PROTOCOL			BIT(1)
+#define CSI2RX_SOFT_RESET_FRONT				BIT(0)
+
+#define CSI2RX_STATIC_CFG_REG			0x008
+#define CSI2RX_STATIC_CFG_DLANE_MAP(llane, plane)	((plane) << (16 + (llane) * 4))
+#define CSI2RX_STATIC_CFG_LANES_MASK			GENMASK(11, 8)
+
+#define CSI2RX_STREAM_BASE(n)		(((n) + 1) * 0x100)
+
+#define CSI2RX_STREAM_CTRL_REG(n)		(CSI2RX_STREAM_BASE(n) + 0x000)
+#define CSI2RX_STREAM_CTRL_START			BIT(0)
+
+#define CSI2RX_STREAM_DATA_CFG_REG(n)		(CSI2RX_STREAM_BASE(n) + 0x008)
+#define CSI2RX_STREAM_DATA_CFG_EN_VC_SELECT		BIT(31)
+#define CSI2RX_STREAM_DATA_CFG_VC_SELECT(n)		BIT((n) + 16)
+
+#define CSI2RX_STREAM_CFG_REG(n)		(CSI2RX_STREAM_BASE(n) + 0x00c)
+#define CSI2RX_STREAM_CFG_FIFO_MODE_LARGE_BUF		(1 << 8)
+
+#define CSI2RX_LANES_MAX	4
+#define CSI2RX_STREAMS_MAX	4
+
+enum csi2rx_pads {
+	CSI2RX_PAD_SINK,
+	CSI2RX_PAD_SOURCE_STREAM0,
+	CSI2RX_PAD_SOURCE_STREAM1,
+	CSI2RX_PAD_SOURCE_STREAM2,
+	CSI2RX_PAD_SOURCE_STREAM3,
+	CSI2RX_PAD_MAX,
+};
+
+struct csi2rx_priv {
+	struct device			*dev;
+	unsigned int			count;
+
+	/*
+	 * Used to prevent race conditions between multiple,
+	 * concurrent calls to start and stop.
+	 */
+	struct mutex			lock;
+
+	void __iomem			*base;
+	struct clk			*sys_clk;
+	struct clk			*p_clk;
+	struct clk			*pixel_clk[CSI2RX_STREAMS_MAX];
+	struct phy			*dphy;
+
+	u8				lanes[CSI2RX_LANES_MAX];
+	u8				num_lanes;
+	u8				max_lanes;
+	u8				max_streams;
+	bool				has_internal_dphy;
+
+	struct v4l2_subdev		subdev;
+	struct v4l2_async_notifier	notifier;
+	struct media_pad		pads[CSI2RX_PAD_MAX];
+
+	/* Remote source */
+	struct v4l2_subdev		*source_subdev;
+	int				source_pad;
+};
+
+static inline
+struct csi2rx_priv *v4l2_subdev_to_csi2rx(struct v4l2_subdev *subdev)
+{
+	return container_of(subdev, struct csi2rx_priv, subdev);
+}
+
+static void csi2rx_reset(struct csi2rx_priv *csi2rx)
+{
+	writel(CSI2RX_SOFT_RESET_PROTOCOL | CSI2RX_SOFT_RESET_FRONT,
+	       csi2rx->base + CSI2RX_SOFT_RESET_REG);
+
+	udelay(10);
+
+	writel(0, csi2rx->base + CSI2RX_SOFT_RESET_REG);
+}
+
+static int csi2rx_start(struct csi2rx_priv *csi2rx)
+{
+	unsigned int i;
+	unsigned long lanes_used = 0;
+	u32 reg;
+	int ret;
+
+	ret = clk_prepare_enable(csi2rx->p_clk);
+	if (ret)
+		return ret;
+
+	csi2rx_reset(csi2rx);
+
+	reg = csi2rx->num_lanes << 8;
+	for (i = 0; i < csi2rx->num_lanes; i++) {
+		reg |= CSI2RX_STATIC_CFG_DLANE_MAP(i, csi2rx->lanes[i]);
+		set_bit(csi2rx->lanes[i], &lanes_used);
+	}
+
+	/*
+	 * Even the unused lanes need to be mapped. In order to avoid
+	 * to map twice to the same physical lane, keep the lanes used
+	 * in the previous loop, and only map unused physical lanes to
+	 * the rest of our logical lanes.
+	 */
+	for (i = csi2rx->num_lanes; i < csi2rx->max_lanes; i++) {
+		unsigned int idx = find_first_zero_bit(&lanes_used,
+						       csi2rx->max_lanes);
+		set_bit(idx, &lanes_used);
+		reg |= CSI2RX_STATIC_CFG_DLANE_MAP(i, i + 1);
+	}
+
+	writel(reg, csi2rx->base + CSI2RX_STATIC_CFG_REG);
+
+	ret = v4l2_subdev_call(csi2rx->source_subdev, video, s_stream, true);
+	if (ret)
+		goto err_disable_pclk;
+
+	/*
+	 * Create a static mapping between the CSI virtual channels
+	 * and the output stream.
+	 *
+	 * This should be enhanced, but v4l2 lacks the support for
+	 * changing that mapping dynamically.
+	 *
+	 * We also cannot enable and disable independent streams here,
+	 * hence the reference counting.
+	 */
+	for (i = 0; i < csi2rx->max_streams; i++) {
+		ret = clk_prepare_enable(csi2rx->pixel_clk[i]);
+		if (ret)
+			goto err_disable_pixclk;
+
+		writel(CSI2RX_STREAM_CFG_FIFO_MODE_LARGE_BUF,
+		       csi2rx->base + CSI2RX_STREAM_CFG_REG(i));
+
+		writel(CSI2RX_STREAM_DATA_CFG_EN_VC_SELECT |
+		       CSI2RX_STREAM_DATA_CFG_VC_SELECT(i),
+		       csi2rx->base + CSI2RX_STREAM_DATA_CFG_REG(i));
+
+		writel(CSI2RX_STREAM_CTRL_START,
+		       csi2rx->base + CSI2RX_STREAM_CTRL_REG(i));
+	}
+
+	ret = clk_prepare_enable(csi2rx->sys_clk);
+	if (ret)
+		goto err_disable_pixclk;
+
+	clk_disable_unprepare(csi2rx->p_clk);
+
+	return 0;
+
+err_disable_pixclk:
+	for (; i > 0; i--)
+		clk_disable_unprepare(csi2rx->pixel_clk[i - 1]);
+
+err_disable_pclk:
+	clk_disable_unprepare(csi2rx->p_clk);
+
+	return ret;
+}
+
+static void csi2rx_stop(struct csi2rx_priv *csi2rx)
+{
+	unsigned int i;
+
+	clk_prepare_enable(csi2rx->p_clk);
+	clk_disable_unprepare(csi2rx->sys_clk);
+
+	for (i = 0; i < csi2rx->max_streams; i++) {
+		writel(0, csi2rx->base + CSI2RX_STREAM_CTRL_REG(i));
+
+		clk_disable_unprepare(csi2rx->pixel_clk[i]);
+	}
+
+	clk_disable_unprepare(csi2rx->p_clk);
+
+	if (v4l2_subdev_call(csi2rx->source_subdev, video, s_stream, false))
+		dev_warn(csi2rx->dev, "Couldn't disable our subdev\n");
+}
+
+static int csi2rx_s_stream(struct v4l2_subdev *subdev, int enable)
+{
+	struct csi2rx_priv *csi2rx = v4l2_subdev_to_csi2rx(subdev);
+	int ret = 0;
+
+	mutex_lock(&csi2rx->lock);
+
+	if (enable) {
+		/*
+		 * If we're not the first users, there's no need to
+		 * enable the whole controller.
+		 */
+		if (!csi2rx->count) {
+			ret = csi2rx_start(csi2rx);
+			if (ret)
+				goto out;
+		}
+
+		csi2rx->count++;
+	} else {
+		csi2rx->count--;
+
+		/*
+		 * Let the last user turn off the lights.
+		 */
+		if (!csi2rx->count)
+			csi2rx_stop(csi2rx);
+	}
+
+out:
+	mutex_unlock(&csi2rx->lock);
+	return ret;
+}
+
+static const struct v4l2_subdev_video_ops csi2rx_video_ops = {
+	.s_stream	= csi2rx_s_stream,
+};
+
+static const struct v4l2_subdev_ops csi2rx_subdev_ops = {
+	.video		= &csi2rx_video_ops,
+};
+
+static int csi2rx_async_bound(struct v4l2_async_notifier *notifier,
+			      struct v4l2_subdev *s_subdev,
+			      struct v4l2_async_subdev *asd)
+{
+	struct v4l2_subdev *subdev = notifier->sd;
+	struct csi2rx_priv *csi2rx = v4l2_subdev_to_csi2rx(subdev);
+
+	csi2rx->source_pad = media_entity_get_fwnode_pad(&s_subdev->entity,
+							 s_subdev->fwnode,
+							 MEDIA_PAD_FL_SOURCE);
+	if (csi2rx->source_pad < 0) {
+		dev_err(csi2rx->dev, "Couldn't find output pad for subdev %s\n",
+			s_subdev->name);
+		return csi2rx->source_pad;
+	}
+
+	csi2rx->source_subdev = s_subdev;
+
+	dev_dbg(csi2rx->dev, "Bound %s pad: %d\n", s_subdev->name,
+		csi2rx->source_pad);
+
+	return media_create_pad_link(&csi2rx->source_subdev->entity,
+				     csi2rx->source_pad,
+				     &csi2rx->subdev.entity, 0,
+				     MEDIA_LNK_FL_ENABLED |
+				     MEDIA_LNK_FL_IMMUTABLE);
+}
+
+static const struct v4l2_async_notifier_operations csi2rx_notifier_ops = {
+	.bound		= csi2rx_async_bound,
+};
+
+static int csi2rx_get_resources(struct csi2rx_priv *csi2rx,
+				struct platform_device *pdev)
+{
+	unsigned char i;
+	u32 dev_cfg;
+	int ret;
+
+	csi2rx->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(csi2rx->base))
+		return PTR_ERR(csi2rx->base);
+
+	csi2rx->sys_clk = devm_clk_get(&pdev->dev, "sys_clk");
+	if (IS_ERR(csi2rx->sys_clk)) {
+		dev_err(&pdev->dev, "Couldn't get sys clock\n");
+		return PTR_ERR(csi2rx->sys_clk);
+	}
+
+	csi2rx->p_clk = devm_clk_get(&pdev->dev, "p_clk");
+	if (IS_ERR(csi2rx->p_clk)) {
+		dev_err(&pdev->dev, "Couldn't get P clock\n");
+		return PTR_ERR(csi2rx->p_clk);
+	}
+
+	csi2rx->dphy = devm_phy_optional_get(&pdev->dev, "dphy");
+	if (IS_ERR(csi2rx->dphy)) {
+		dev_err(&pdev->dev, "Couldn't get external D-PHY\n");
+		return PTR_ERR(csi2rx->dphy);
+	}
+
+	/*
+	 * FIXME: Once we'll have external D-PHY support, the check
+	 * will need to be removed.
+	 */
+	if (csi2rx->dphy) {
+		dev_err(&pdev->dev, "External D-PHY not supported yet\n");
+		return -EINVAL;
+	}
+
+	ret = clk_prepare_enable(csi2rx->p_clk);
+	if (ret) {
+		dev_err(&pdev->dev, "Couldn't prepare and enable P clock\n");
+		return ret;
+	}
+
+	dev_cfg = readl(csi2rx->base + CSI2RX_DEVICE_CFG_REG);
+	clk_disable_unprepare(csi2rx->p_clk);
+
+	csi2rx->max_lanes = dev_cfg & 7;
+	if (csi2rx->max_lanes > CSI2RX_LANES_MAX) {
+		dev_err(&pdev->dev, "Invalid number of lanes: %u\n",
+			csi2rx->max_lanes);
+		return -EINVAL;
+	}
+
+	csi2rx->max_streams = (dev_cfg >> 4) & 7;
+	if (csi2rx->max_streams > CSI2RX_STREAMS_MAX) {
+		dev_err(&pdev->dev, "Invalid number of streams: %u\n",
+			csi2rx->max_streams);
+		return -EINVAL;
+	}
+
+	csi2rx->has_internal_dphy = dev_cfg & BIT(3) ? true : false;
+
+	/*
+	 * FIXME: Once we'll have internal D-PHY support, the check
+	 * will need to be removed.
+	 */
+	if (csi2rx->has_internal_dphy) {
+		dev_err(&pdev->dev, "Internal D-PHY not supported yet\n");
+		return -EINVAL;
+	}
+
+	for (i = 0; i < csi2rx->max_streams; i++) {
+		char clk_name[16];
+
+		snprintf(clk_name, sizeof(clk_name), "pixel_if%u_clk", i);
+		csi2rx->pixel_clk[i] = devm_clk_get(&pdev->dev, clk_name);
+		if (IS_ERR(csi2rx->pixel_clk[i])) {
+			dev_err(&pdev->dev, "Couldn't get clock %s\n", clk_name);
+			return PTR_ERR(csi2rx->pixel_clk[i]);
+		}
+	}
+
+	return 0;
+}
+
+static int csi2rx_parse_dt(struct csi2rx_priv *csi2rx)
+{
+	struct v4l2_fwnode_endpoint v4l2_ep = { .bus_type = 0 };
+	struct v4l2_async_subdev *asd;
+	struct fwnode_handle *fwh;
+	struct device_node *ep;
+	int ret;
+
+	ep = of_graph_get_endpoint_by_regs(csi2rx->dev->of_node, 0, 0);
+	if (!ep)
+		return -EINVAL;
+
+	fwh = of_fwnode_handle(ep);
+	ret = v4l2_fwnode_endpoint_parse(fwh, &v4l2_ep);
+	if (ret) {
+		dev_err(csi2rx->dev, "Could not parse v4l2 endpoint\n");
+		of_node_put(ep);
+		return ret;
+	}
+
+	if (v4l2_ep.bus_type != V4L2_MBUS_CSI2_DPHY) {
+		dev_err(csi2rx->dev, "Unsupported media bus type: 0x%x\n",
+			v4l2_ep.bus_type);
+		of_node_put(ep);
+		return -EINVAL;
+	}
+
+	memcpy(csi2rx->lanes, v4l2_ep.bus.mipi_csi2.data_lanes,
+	       sizeof(csi2rx->lanes));
+	csi2rx->num_lanes = v4l2_ep.bus.mipi_csi2.num_data_lanes;
+	if (csi2rx->num_lanes > csi2rx->max_lanes) {
+		dev_err(csi2rx->dev, "Unsupported number of data-lanes: %d\n",
+			csi2rx->num_lanes);
+		of_node_put(ep);
+		return -EINVAL;
+	}
+
+	v4l2_async_nf_init(&csi2rx->notifier);
+
+	asd = v4l2_async_nf_add_fwnode_remote(&csi2rx->notifier, fwh,
+					      struct v4l2_async_subdev);
+	of_node_put(ep);
+	if (IS_ERR(asd))
+		return PTR_ERR(asd);
+
+	csi2rx->notifier.ops = &csi2rx_notifier_ops;
+
+	ret = v4l2_async_subdev_nf_register(&csi2rx->subdev, &csi2rx->notifier);
+	if (ret)
+		v4l2_async_nf_cleanup(&csi2rx->notifier);
+
+	return ret;
+}
+
+static int csi2rx_probe(struct platform_device *pdev)
+{
+	struct csi2rx_priv *csi2rx;
+	unsigned int i;
+	int ret;
+
+	csi2rx = kzalloc(sizeof(*csi2rx), GFP_KERNEL);
+	if (!csi2rx)
+		return -ENOMEM;
+	platform_set_drvdata(pdev, csi2rx);
+	csi2rx->dev = &pdev->dev;
+	mutex_init(&csi2rx->lock);
+
+	ret = csi2rx_get_resources(csi2rx, pdev);
+	if (ret)
+		goto err_free_priv;
+
+	ret = csi2rx_parse_dt(csi2rx);
+	if (ret)
+		goto err_free_priv;
+
+	csi2rx->subdev.owner = THIS_MODULE;
+	csi2rx->subdev.dev = &pdev->dev;
+	v4l2_subdev_init(&csi2rx->subdev, &csi2rx_subdev_ops);
+	v4l2_set_subdevdata(&csi2rx->subdev, &pdev->dev);
+	snprintf(csi2rx->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s.%s",
+		 KBUILD_MODNAME, dev_name(&pdev->dev));
+
+	/* Create our media pads */
+	csi2rx->subdev.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
+	csi2rx->pads[CSI2RX_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
+	for (i = CSI2RX_PAD_SOURCE_STREAM0; i < CSI2RX_PAD_MAX; i++)
+		csi2rx->pads[i].flags = MEDIA_PAD_FL_SOURCE;
+
+	ret = media_entity_pads_init(&csi2rx->subdev.entity, CSI2RX_PAD_MAX,
+				     csi2rx->pads);
+	if (ret)
+		goto err_cleanup;
+
+	ret = v4l2_async_register_subdev(&csi2rx->subdev);
+	if (ret < 0)
+		goto err_cleanup;
+
+	dev_info(&pdev->dev,
+		 "Probed CSI2RX with %u/%u lanes, %u streams, %s D-PHY\n",
+		 csi2rx->num_lanes, csi2rx->max_lanes, csi2rx->max_streams,
+		 csi2rx->has_internal_dphy ? "internal" : "no");
+
+	return 0;
+
+err_cleanup:
+	v4l2_async_nf_cleanup(&csi2rx->notifier);
+err_free_priv:
+	kfree(csi2rx);
+	return ret;
+}
+
+static int csi2rx_remove(struct platform_device *pdev)
+{
+	struct csi2rx_priv *csi2rx = platform_get_drvdata(pdev);
+
+	v4l2_async_unregister_subdev(&csi2rx->subdev);
+	kfree(csi2rx);
+
+	return 0;
+}
+
+static const struct of_device_id csi2rx_of_table[] = {
+	{ .compatible = "cdns,csi2rx" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, csi2rx_of_table);
+
+static struct platform_driver csi2rx_driver = {
+	.probe	= csi2rx_probe,
+	.remove	= csi2rx_remove,
+
+	.driver	= {
+		.name		= "cdns-csi2rx",
+		.of_match_table	= csi2rx_of_table,
+	},
+};
+module_platform_driver(csi2rx_driver);
+MODULE_AUTHOR("Maxime Ripard <maxime.ripard@bootlin.com>");
+MODULE_DESCRIPTION("Cadence CSI2-RX controller");
+MODULE_LICENSE("GPL");