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, 518 insertions, 0 deletions

diff --git a/drivers/usb/typec/mux.c b/drivers/usb/typec/mux.c
new file mode 100644
index 000000000..c7177ddd4
--- /dev/null
+++ b/drivers/usb/typec/mux.c
@@ -0,0 +1,518 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * USB Type-C Multiplexer/DeMultiplexer Switch support
+ *
+ * Copyright (C) 2018 Intel Corporation
+ * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+ *         Hans de Goede <hdegoede@redhat.com>
+ */
+
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/property.h>
+#include <linux/slab.h>
+
+#include "class.h"
+#include "mux.h"
+
+#define TYPEC_MUX_MAX_DEVS	3
+
+struct typec_switch {
+	struct typec_switch_dev *sw_devs[TYPEC_MUX_MAX_DEVS];
+	unsigned int num_sw_devs;
+};
+
+static int switch_fwnode_match(struct device *dev, const void *fwnode)
+{
+	if (!is_typec_switch_dev(dev))
+		return 0;
+
+	return device_match_fwnode(dev, fwnode);
+}
+
+static void *typec_switch_match(const struct fwnode_handle *fwnode,
+				const char *id, void *data)
+{
+	struct device *dev;
+
+	/*
+	 * Device graph (OF graph) does not give any means to identify the
+	 * device type or the device class of the remote port parent that @fwnode
+	 * represents, so in order to identify the type or the class of @fwnode
+	 * an additional device property is needed. With typec switches the
+	 * property is named "orientation-switch" (@id). The value of the device
+	 * property is ignored.
+	 */
+	if (id && !fwnode_property_present(fwnode, id))
+		return NULL;
+
+	/*
+	 * At this point we are sure that @fwnode is a typec switch in all
+	 * cases. If the switch hasn't yet been registered for some reason, the
+	 * function "defers probe" for now.
+	 */
+	dev = class_find_device(&typec_mux_class, NULL, fwnode,
+				switch_fwnode_match);
+
+	return dev ? to_typec_switch_dev(dev) : ERR_PTR(-EPROBE_DEFER);
+}
+
+/**
+ * fwnode_typec_switch_get - Find USB Type-C orientation switch
+ * @fwnode: The caller device node
+ *
+ * Finds a switch linked with @dev. Returns a reference to the switch on
+ * success, NULL if no matching connection was found, or
+ * ERR_PTR(-EPROBE_DEFER) when a connection was found but the switch
+ * has not been enumerated yet.
+ */
+struct typec_switch *fwnode_typec_switch_get(struct fwnode_handle *fwnode)
+{
+	struct typec_switch_dev *sw_devs[TYPEC_MUX_MAX_DEVS];
+	struct typec_switch *sw;
+	int count;
+	int err;
+	int i;
+
+	sw = kzalloc(sizeof(*sw), GFP_KERNEL);
+	if (!sw)
+		return ERR_PTR(-ENOMEM);
+
+	count = fwnode_connection_find_matches(fwnode, "orientation-switch", NULL,
+					       typec_switch_match,
+					       (void **)sw_devs,
+					       ARRAY_SIZE(sw_devs));
+	if (count <= 0) {
+		kfree(sw);
+		return NULL;
+	}
+
+	for (i = 0; i < count; i++) {
+		if (IS_ERR(sw_devs[i])) {
+			err = PTR_ERR(sw_devs[i]);
+			goto put_sw_devs;
+		}
+	}
+
+	for (i = 0; i < count; i++) {
+		WARN_ON(!try_module_get(sw_devs[i]->dev.parent->driver->owner));
+		sw->sw_devs[i] = sw_devs[i];
+	}
+
+	sw->num_sw_devs = count;
+
+	return sw;
+
+put_sw_devs:
+	for (i = 0; i < count; i++) {
+		if (!IS_ERR(sw_devs[i]))
+			put_device(&sw_devs[i]->dev);
+	}
+
+	kfree(sw);
+
+	return ERR_PTR(err);
+}
+EXPORT_SYMBOL_GPL(fwnode_typec_switch_get);
+
+/**
+ * typec_switch_put - Release USB Type-C orientation switch
+ * @sw: USB Type-C orientation switch
+ *
+ * Decrement reference count for @sw.
+ */
+void typec_switch_put(struct typec_switch *sw)
+{
+	struct typec_switch_dev *sw_dev;
+	unsigned int i;
+
+	if (IS_ERR_OR_NULL(sw))
+		return;
+
+	for (i = 0; i < sw->num_sw_devs; i++) {
+		sw_dev = sw->sw_devs[i];
+
+		module_put(sw_dev->dev.parent->driver->owner);
+		put_device(&sw_dev->dev);
+	}
+	kfree(sw);
+}
+EXPORT_SYMBOL_GPL(typec_switch_put);
+
+static void typec_switch_release(struct device *dev)
+{
+	kfree(to_typec_switch_dev(dev));
+}
+
+const struct device_type typec_switch_dev_type = {
+	.name = "orientation_switch",
+	.release = typec_switch_release,
+};
+
+/**
+ * typec_switch_register - Register USB Type-C orientation switch
+ * @parent: Parent device
+ * @desc: Orientation switch description
+ *
+ * This function registers a switch that can be used for routing the correct
+ * data pairs depending on the cable plug orientation from the USB Type-C
+ * connector to the USB controllers. USB Type-C plugs can be inserted
+ * right-side-up or upside-down.
+ */
+struct typec_switch_dev *
+typec_switch_register(struct device *parent,
+		      const struct typec_switch_desc *desc)
+{
+	struct typec_switch_dev *sw_dev;
+	int ret;
+
+	if (!desc || !desc->set)
+		return ERR_PTR(-EINVAL);
+
+	sw_dev = kzalloc(sizeof(*sw_dev), GFP_KERNEL);
+	if (!sw_dev)
+		return ERR_PTR(-ENOMEM);
+
+	sw_dev->set = desc->set;
+
+	device_initialize(&sw_dev->dev);
+	sw_dev->dev.parent = parent;
+	sw_dev->dev.fwnode = desc->fwnode;
+	sw_dev->dev.class = &typec_mux_class;
+	sw_dev->dev.type = &typec_switch_dev_type;
+	sw_dev->dev.driver_data = desc->drvdata;
+	ret = dev_set_name(&sw_dev->dev, "%s-switch", desc->name ? desc->name : dev_name(parent));
+	if (ret) {
+		put_device(&sw_dev->dev);
+		return ERR_PTR(ret);
+	}
+
+	ret = device_add(&sw_dev->dev);
+	if (ret) {
+		dev_err(parent, "failed to register switch (%d)\n", ret);
+		put_device(&sw_dev->dev);
+		return ERR_PTR(ret);
+	}
+
+	return sw_dev;
+}
+EXPORT_SYMBOL_GPL(typec_switch_register);
+
+int typec_switch_set(struct typec_switch *sw,
+		     enum typec_orientation orientation)
+{
+	struct typec_switch_dev *sw_dev;
+	unsigned int i;
+	int ret;
+
+	if (IS_ERR_OR_NULL(sw))
+		return 0;
+
+	for (i = 0; i < sw->num_sw_devs; i++) {
+		sw_dev = sw->sw_devs[i];
+
+		ret = sw_dev->set(sw_dev, orientation);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(typec_switch_set);
+
+/**
+ * typec_switch_unregister - Unregister USB Type-C orientation switch
+ * @sw_dev: USB Type-C orientation switch
+ *
+ * Unregister switch that was registered with typec_switch_register().
+ */
+void typec_switch_unregister(struct typec_switch_dev *sw_dev)
+{
+	if (!IS_ERR_OR_NULL(sw_dev))
+		device_unregister(&sw_dev->dev);
+}
+EXPORT_SYMBOL_GPL(typec_switch_unregister);
+
+void typec_switch_set_drvdata(struct typec_switch_dev *sw_dev, void *data)
+{
+	dev_set_drvdata(&sw_dev->dev, data);
+}
+EXPORT_SYMBOL_GPL(typec_switch_set_drvdata);
+
+void *typec_switch_get_drvdata(struct typec_switch_dev *sw_dev)
+{
+	return dev_get_drvdata(&sw_dev->dev);
+}
+EXPORT_SYMBOL_GPL(typec_switch_get_drvdata);
+
+/* ------------------------------------------------------------------------- */
+
+struct typec_mux {
+	struct typec_mux_dev *mux_devs[TYPEC_MUX_MAX_DEVS];
+	unsigned int num_mux_devs;
+};
+
+static int mux_fwnode_match(struct device *dev, const void *fwnode)
+{
+	if (!is_typec_mux_dev(dev))
+		return 0;
+
+	return device_match_fwnode(dev, fwnode);
+}
+
+static void *typec_mux_match(const struct fwnode_handle *fwnode,
+			     const char *id, void *data)
+{
+	const struct typec_altmode_desc *desc = data;
+	struct device *dev;
+	bool match;
+	int nval;
+	u16 *val;
+	int ret;
+	int i;
+
+	/*
+	 * Check has the identifier already been "consumed". If it
+	 * has, no need to do any extra connection identification.
+	 */
+	match = !id;
+	if (match)
+		goto find_mux;
+
+	if (!desc) {
+		/*
+		 * Accessory Mode muxes & muxes which explicitly specify
+		 * the required identifier can avoid SVID matching.
+		 */
+		match = fwnode_property_present(fwnode, "accessory") ||
+			fwnode_property_present(fwnode, id);
+		if (match)
+			goto find_mux;
+		return NULL;
+	}
+
+	/* Alternate Mode muxes */
+	nval = fwnode_property_count_u16(fwnode, "svid");
+	if (nval <= 0)
+		return NULL;
+
+	val = kcalloc(nval, sizeof(*val), GFP_KERNEL);
+	if (!val)
+		return ERR_PTR(-ENOMEM);
+
+	ret = fwnode_property_read_u16_array(fwnode, "svid", val, nval);
+	if (ret < 0) {
+		kfree(val);
+		return ERR_PTR(ret);
+	}
+
+	for (i = 0; i < nval; i++) {
+		match = val[i] == desc->svid;
+		if (match) {
+			kfree(val);
+			goto find_mux;
+		}
+	}
+	kfree(val);
+	return NULL;
+
+find_mux:
+	dev = class_find_device(&typec_mux_class, NULL, fwnode,
+				mux_fwnode_match);
+
+	return dev ? to_typec_mux_dev(dev) : ERR_PTR(-EPROBE_DEFER);
+}
+
+/**
+ * fwnode_typec_mux_get - Find USB Type-C Multiplexer
+ * @fwnode: The caller device node
+ * @desc: Alt Mode description
+ *
+ * Finds a mux linked to the caller. This function is primarily meant for the
+ * Type-C drivers. Returns a reference to the mux on success, NULL if no
+ * matching connection was found, or ERR_PTR(-EPROBE_DEFER) when a connection
+ * was found but the mux has not been enumerated yet.
+ */
+struct typec_mux *fwnode_typec_mux_get(struct fwnode_handle *fwnode,
+				       const struct typec_altmode_desc *desc)
+{
+	struct typec_mux_dev *mux_devs[TYPEC_MUX_MAX_DEVS];
+	struct typec_mux *mux;
+	int count;
+	int err;
+	int i;
+
+	mux = kzalloc(sizeof(*mux), GFP_KERNEL);
+	if (!mux)
+		return ERR_PTR(-ENOMEM);
+
+	count = fwnode_connection_find_matches(fwnode, "mode-switch",
+					       (void *)desc, typec_mux_match,
+					       (void **)mux_devs,
+					       ARRAY_SIZE(mux_devs));
+	if (count <= 0) {
+		kfree(mux);
+		return NULL;
+	}
+
+	for (i = 0; i < count; i++) {
+		if (IS_ERR(mux_devs[i])) {
+			err = PTR_ERR(mux_devs[i]);
+			goto put_mux_devs;
+		}
+	}
+
+	for (i = 0; i < count; i++) {
+		WARN_ON(!try_module_get(mux_devs[i]->dev.parent->driver->owner));
+		mux->mux_devs[i] = mux_devs[i];
+	}
+
+	mux->num_mux_devs = count;
+
+	return mux;
+
+put_mux_devs:
+	for (i = 0; i < count; i++) {
+		if (!IS_ERR(mux_devs[i]))
+			put_device(&mux_devs[i]->dev);
+	}
+
+	kfree(mux);
+
+	return ERR_PTR(err);
+}
+EXPORT_SYMBOL_GPL(fwnode_typec_mux_get);
+
+/**
+ * typec_mux_put - Release handle to a Multiplexer
+ * @mux: USB Type-C Connector Multiplexer/DeMultiplexer
+ *
+ * Decrements reference count for @mux.
+ */
+void typec_mux_put(struct typec_mux *mux)
+{
+	struct typec_mux_dev *mux_dev;
+	unsigned int i;
+
+	if (IS_ERR_OR_NULL(mux))
+		return;
+
+	for (i = 0; i < mux->num_mux_devs; i++) {
+		mux_dev = mux->mux_devs[i];
+		module_put(mux_dev->dev.parent->driver->owner);
+		put_device(&mux_dev->dev);
+	}
+	kfree(mux);
+}
+EXPORT_SYMBOL_GPL(typec_mux_put);
+
+int typec_mux_set(struct typec_mux *mux, struct typec_mux_state *state)
+{
+	struct typec_mux_dev *mux_dev;
+	unsigned int i;
+	int ret;
+
+	if (IS_ERR_OR_NULL(mux))
+		return 0;
+
+	for (i = 0; i < mux->num_mux_devs; i++) {
+		mux_dev = mux->mux_devs[i];
+
+		ret = mux_dev->set(mux_dev, state);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(typec_mux_set);
+
+static void typec_mux_release(struct device *dev)
+{
+	kfree(to_typec_mux_dev(dev));
+}
+
+const struct device_type typec_mux_dev_type = {
+	.name = "mode_switch",
+	.release = typec_mux_release,
+};
+
+/**
+ * typec_mux_register - Register Multiplexer routing USB Type-C pins
+ * @parent: Parent device
+ * @desc: Multiplexer description
+ *
+ * USB Type-C connectors can be used for alternate modes of operation besides
+ * USB when Accessory/Alternate Modes are supported. With some of those modes,
+ * the pins on the connector need to be reconfigured. This function registers
+ * multiplexer switches routing the pins on the connector.
+ */
+struct typec_mux_dev *
+typec_mux_register(struct device *parent, const struct typec_mux_desc *desc)
+{
+	struct typec_mux_dev *mux_dev;
+	int ret;
+
+	if (!desc || !desc->set)
+		return ERR_PTR(-EINVAL);
+
+	mux_dev = kzalloc(sizeof(*mux_dev), GFP_KERNEL);
+	if (!mux_dev)
+		return ERR_PTR(-ENOMEM);
+
+	mux_dev->set = desc->set;
+
+	device_initialize(&mux_dev->dev);
+	mux_dev->dev.parent = parent;
+	mux_dev->dev.fwnode = desc->fwnode;
+	mux_dev->dev.class = &typec_mux_class;
+	mux_dev->dev.type = &typec_mux_dev_type;
+	mux_dev->dev.driver_data = desc->drvdata;
+	ret = dev_set_name(&mux_dev->dev, "%s-mux", desc->name ? desc->name : dev_name(parent));
+	if (ret) {
+		put_device(&mux_dev->dev);
+		return ERR_PTR(ret);
+	}
+
+	ret = device_add(&mux_dev->dev);
+	if (ret) {
+		dev_err(parent, "failed to register mux (%d)\n", ret);
+		put_device(&mux_dev->dev);
+		return ERR_PTR(ret);
+	}
+
+	return mux_dev;
+}
+EXPORT_SYMBOL_GPL(typec_mux_register);
+
+/**
+ * typec_mux_unregister - Unregister Multiplexer Switch
+ * @mux_dev: USB Type-C Connector Multiplexer/DeMultiplexer
+ *
+ * Unregister mux that was registered with typec_mux_register().
+ */
+void typec_mux_unregister(struct typec_mux_dev *mux_dev)
+{
+	if (!IS_ERR_OR_NULL(mux_dev))
+		device_unregister(&mux_dev->dev);
+}
+EXPORT_SYMBOL_GPL(typec_mux_unregister);
+
+void typec_mux_set_drvdata(struct typec_mux_dev *mux_dev, void *data)
+{
+	dev_set_drvdata(&mux_dev->dev, data);
+}
+EXPORT_SYMBOL_GPL(typec_mux_set_drvdata);
+
+void *typec_mux_get_drvdata(struct typec_mux_dev *mux_dev)
+{
+	return dev_get_drvdata(&mux_dev->dev);
+}
+EXPORT_SYMBOL_GPL(typec_mux_get_drvdata);
+
+struct class typec_mux_class = {
+	.name = "typec_mux",
+	.owner = THIS_MODULE,
+};