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, 960 insertions, 0 deletions

diff --git a/drivers/platform/mellanox/mlxreg-lc.c b/drivers/platform/mellanox/mlxreg-lc.c
new file mode 100644
index 000000000..8d833836a
--- /dev/null
+++ b/drivers/platform/mellanox/mlxreg-lc.c
@@ -0,0 +1,960 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Nvidia line card driver
+ *
+ * Copyright (C) 2020 Nvidia Technologies Ltd.
+ */
+
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/platform_data/mlxcpld.h>
+#include <linux/platform_data/mlxreg.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+/* I2C bus IO offsets */
+#define MLXREG_LC_REG_CPLD1_VER_OFFSET		0x2500
+#define MLXREG_LC_REG_FPGA1_VER_OFFSET		0x2501
+#define MLXREG_LC_REG_CPLD1_PN_OFFSET		0x2504
+#define MLXREG_LC_REG_FPGA1_PN_OFFSET		0x2506
+#define MLXREG_LC_REG_RESET_CAUSE_OFFSET	0x251d
+#define MLXREG_LC_REG_LED1_OFFSET		0x2520
+#define MLXREG_LC_REG_GP0_OFFSET		0x252e
+#define MLXREG_LC_REG_FIELD_UPGRADE		0x2534
+#define MLXREG_LC_CHANNEL_I2C_REG		0x25dc
+#define MLXREG_LC_REG_CPLD1_MVER_OFFSET		0x25de
+#define MLXREG_LC_REG_FPGA1_MVER_OFFSET		0x25df
+#define MLXREG_LC_REG_MAX_POWER_OFFSET		0x25f1
+#define MLXREG_LC_REG_CONFIG_OFFSET		0x25fb
+#define MLXREG_LC_REG_MAX			0x3fff
+
+/**
+ * enum mlxreg_lc_type - line cards types
+ *
+ * @MLXREG_LC_SN4800_C16: 100GbE line card with 16 QSFP28 ports;
+ */
+enum mlxreg_lc_type {
+	MLXREG_LC_SN4800_C16 = 0x0000,
+};
+
+/**
+ * enum mlxreg_lc_state - line cards state
+ *
+ * @MLXREG_LC_INITIALIZED: line card is initialized;
+ * @MLXREG_LC_POWERED: line card is powered;
+ * @MLXREG_LC_SYNCED: line card is synchronized between hardware and firmware;
+ */
+enum mlxreg_lc_state {
+	MLXREG_LC_INITIALIZED = BIT(0),
+	MLXREG_LC_POWERED = BIT(1),
+	MLXREG_LC_SYNCED = BIT(2),
+};
+
+#define MLXREG_LC_CONFIGURED	(MLXREG_LC_INITIALIZED | MLXREG_LC_POWERED | MLXREG_LC_SYNCED)
+
+/* mlxreg_lc - device private data
+ * @dev: platform device;
+ * @lock: line card lock;
+ * @par_regmap: parent device regmap handle;
+ * @data: pltaform core data;
+ * @io_data: register access platform data;
+ * @led_data: LED platform data ;
+ * @mux_data: MUX platform data;
+ * @led: LED device;
+ * @io_regs: register access device;
+ * @mux_brdinfo: mux configuration;
+ * @mux: mux devices;
+ * @aux_devs: I2C devices feeding by auxiliary power;
+ * @aux_devs_num: number of I2C devices feeding by auxiliary power;
+ * @main_devs: I2C devices feeding by main power;
+ * @main_devs_num: number of I2C devices feeding by main power;
+ * @state: line card state;
+ */
+struct mlxreg_lc {
+	struct device *dev;
+	struct mutex lock; /* line card access lock */
+	void *par_regmap;
+	struct mlxreg_core_data *data;
+	struct mlxreg_core_platform_data *io_data;
+	struct mlxreg_core_platform_data *led_data;
+	struct mlxcpld_mux_plat_data *mux_data;
+	struct platform_device *led;
+	struct platform_device *io_regs;
+	struct i2c_board_info *mux_brdinfo;
+	struct platform_device *mux;
+	struct mlxreg_hotplug_device *aux_devs;
+	int aux_devs_num;
+	struct mlxreg_hotplug_device *main_devs;
+	int main_devs_num;
+	enum mlxreg_lc_state state;
+};
+
+static bool mlxreg_lc_writeable_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case MLXREG_LC_REG_LED1_OFFSET:
+	case MLXREG_LC_REG_GP0_OFFSET:
+	case MLXREG_LC_REG_FIELD_UPGRADE:
+	case MLXREG_LC_CHANNEL_I2C_REG:
+		return true;
+	}
+	return false;
+}
+
+static bool mlxreg_lc_readable_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case MLXREG_LC_REG_CPLD1_VER_OFFSET:
+	case MLXREG_LC_REG_FPGA1_VER_OFFSET:
+	case MLXREG_LC_REG_CPLD1_PN_OFFSET:
+	case MLXREG_LC_REG_FPGA1_PN_OFFSET:
+	case MLXREG_LC_REG_RESET_CAUSE_OFFSET:
+	case MLXREG_LC_REG_LED1_OFFSET:
+	case MLXREG_LC_REG_GP0_OFFSET:
+	case MLXREG_LC_REG_FIELD_UPGRADE:
+	case MLXREG_LC_CHANNEL_I2C_REG:
+	case MLXREG_LC_REG_CPLD1_MVER_OFFSET:
+	case MLXREG_LC_REG_FPGA1_MVER_OFFSET:
+	case MLXREG_LC_REG_MAX_POWER_OFFSET:
+	case MLXREG_LC_REG_CONFIG_OFFSET:
+		return true;
+	}
+	return false;
+}
+
+static bool mlxreg_lc_volatile_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case MLXREG_LC_REG_CPLD1_VER_OFFSET:
+	case MLXREG_LC_REG_FPGA1_VER_OFFSET:
+	case MLXREG_LC_REG_CPLD1_PN_OFFSET:
+	case MLXREG_LC_REG_FPGA1_PN_OFFSET:
+	case MLXREG_LC_REG_RESET_CAUSE_OFFSET:
+	case MLXREG_LC_REG_LED1_OFFSET:
+	case MLXREG_LC_REG_GP0_OFFSET:
+	case MLXREG_LC_REG_FIELD_UPGRADE:
+	case MLXREG_LC_CHANNEL_I2C_REG:
+	case MLXREG_LC_REG_CPLD1_MVER_OFFSET:
+	case MLXREG_LC_REG_FPGA1_MVER_OFFSET:
+	case MLXREG_LC_REG_MAX_POWER_OFFSET:
+	case MLXREG_LC_REG_CONFIG_OFFSET:
+		return true;
+	}
+	return false;
+}
+
+static const struct reg_default mlxreg_lc_regmap_default[] = {
+	{ MLXREG_LC_CHANNEL_I2C_REG, 0x00 },
+};
+
+/* Configuration for the register map of a device with 2 bytes address space. */
+static const struct regmap_config mlxreg_lc_regmap_conf = {
+	.reg_bits = 16,
+	.val_bits = 8,
+	.max_register = MLXREG_LC_REG_MAX,
+	.cache_type = REGCACHE_FLAT,
+	.writeable_reg = mlxreg_lc_writeable_reg,
+	.readable_reg = mlxreg_lc_readable_reg,
+	.volatile_reg = mlxreg_lc_volatile_reg,
+	.reg_defaults = mlxreg_lc_regmap_default,
+	.num_reg_defaults = ARRAY_SIZE(mlxreg_lc_regmap_default),
+};
+
+/* Default channels vector.
+ * It contains only the channels, which physically connected to the devices,
+ * empty channels are skipped.
+ */
+static int mlxreg_lc_chan[] = {
+	0x04, 0x05, 0x06, 0x07, 0x08, 0x10, 0x20, 0x21, 0x22, 0x23, 0x40, 0x41,
+	0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d,
+	0x4e, 0x4f
+};
+
+/* Defaul mux configuration. */
+static struct mlxcpld_mux_plat_data mlxreg_lc_mux_data[] = {
+	{
+		.chan_ids = mlxreg_lc_chan,
+		.num_adaps = ARRAY_SIZE(mlxreg_lc_chan),
+		.sel_reg_addr = MLXREG_LC_CHANNEL_I2C_REG,
+		.reg_size = 2,
+	},
+};
+
+/* Defaul mux board info. */
+static struct i2c_board_info mlxreg_lc_mux_brdinfo = {
+	I2C_BOARD_INFO("i2c-mux-mlxcpld", 0x32),
+};
+
+/* Line card default auxiliary power static devices. */
+static struct i2c_board_info mlxreg_lc_aux_pwr_devices[] = {
+	{
+		I2C_BOARD_INFO("24c32", 0x51),
+	},
+	{
+		I2C_BOARD_INFO("24c32", 0x51),
+	},
+};
+
+/* Line card default auxiliary power board info. */
+static struct mlxreg_hotplug_device mlxreg_lc_aux_pwr_brdinfo[] = {
+	{
+		.brdinfo = &mlxreg_lc_aux_pwr_devices[0],
+		.nr = 3,
+	},
+	{
+		.brdinfo = &mlxreg_lc_aux_pwr_devices[1],
+		.nr = 4,
+	},
+};
+
+/* Line card default main power static devices. */
+static struct i2c_board_info mlxreg_lc_main_pwr_devices[] = {
+	{
+		I2C_BOARD_INFO("mp2975", 0x62),
+	},
+	{
+		I2C_BOARD_INFO("mp2975", 0x64),
+	},
+	{
+		I2C_BOARD_INFO("max11603", 0x6d),
+	},
+	{
+		I2C_BOARD_INFO("lm25066", 0x15),
+	},
+};
+
+/* Line card default main power board info. */
+static struct mlxreg_hotplug_device mlxreg_lc_main_pwr_brdinfo[] = {
+	{
+		.brdinfo = &mlxreg_lc_main_pwr_devices[0],
+		.nr = 0,
+	},
+	{
+		.brdinfo = &mlxreg_lc_main_pwr_devices[1],
+		.nr = 0,
+	},
+	{
+		.brdinfo = &mlxreg_lc_main_pwr_devices[2],
+		.nr = 1,
+	},
+	{
+		.brdinfo = &mlxreg_lc_main_pwr_devices[3],
+		.nr = 2,
+	},
+};
+
+/* LED default data. */
+static struct mlxreg_core_data mlxreg_lc_led_data[] = {
+	{
+		.label = "status:green",
+		.reg = MLXREG_LC_REG_LED1_OFFSET,
+		.mask = GENMASK(7, 4),
+	},
+	{
+		.label = "status:orange",
+		.reg = MLXREG_LC_REG_LED1_OFFSET,
+		.mask = GENMASK(7, 4),
+	},
+};
+
+static struct mlxreg_core_platform_data mlxreg_lc_led = {
+	.identity = "pci",
+	.data = mlxreg_lc_led_data,
+	.counter = ARRAY_SIZE(mlxreg_lc_led_data),
+};
+
+/* Default register access data. */
+static struct mlxreg_core_data mlxreg_lc_io_data[] = {
+	{
+		.label = "cpld1_version",
+		.reg = MLXREG_LC_REG_CPLD1_VER_OFFSET,
+		.bit = GENMASK(7, 0),
+		.mode = 0444,
+	},
+	{
+		.label = "fpga1_version",
+		.reg = MLXREG_LC_REG_FPGA1_VER_OFFSET,
+		.bit = GENMASK(7, 0),
+		.mode = 0444,
+	},
+	{
+		.label = "cpld1_pn",
+		.reg = MLXREG_LC_REG_CPLD1_PN_OFFSET,
+		.bit = GENMASK(15, 0),
+		.mode = 0444,
+		.regnum = 2,
+	},
+	{
+		.label = "fpga1_pn",
+		.reg = MLXREG_LC_REG_FPGA1_PN_OFFSET,
+		.bit = GENMASK(15, 0),
+		.mode = 0444,
+		.regnum = 2,
+	},
+	{
+		.label = "cpld1_version_min",
+		.reg = MLXREG_LC_REG_CPLD1_MVER_OFFSET,
+		.bit = GENMASK(7, 0),
+		.mode = 0444,
+	},
+	{
+		.label = "fpga1_version_min",
+		.reg = MLXREG_LC_REG_FPGA1_MVER_OFFSET,
+		.bit = GENMASK(7, 0),
+		.mode = 0444,
+	},
+	{
+		.label = "reset_fpga_not_done",
+		.reg = MLXREG_LC_REG_RESET_CAUSE_OFFSET,
+		.mask = GENMASK(7, 0) & ~BIT(1),
+		.mode = 0444,
+	},
+	{
+		.label = "reset_aux_pwr_or_ref",
+		.reg = MLXREG_LC_REG_RESET_CAUSE_OFFSET,
+		.mask = GENMASK(7, 0) & ~BIT(2),
+		.mode = 0444,
+	},
+	{
+		.label = "reset_dc_dc_pwr_fail",
+		.reg = MLXREG_LC_REG_RESET_CAUSE_OFFSET,
+		.mask = GENMASK(7, 0) & ~BIT(3),
+		.mode = 0444,
+	},
+	{
+		.label = "reset_from_chassis",
+		.reg = MLXREG_LC_REG_RESET_CAUSE_OFFSET,
+		.mask = GENMASK(7, 0) & ~BIT(4),
+		.mode = 0444,
+	},
+	{
+		.label = "reset_pwr_off_from_chassis",
+		.reg = MLXREG_LC_REG_RESET_CAUSE_OFFSET,
+		.mask = GENMASK(7, 0) & ~BIT(5),
+		.mode = 0444,
+	},
+	{
+		.label = "reset_line_card",
+		.reg = MLXREG_LC_REG_RESET_CAUSE_OFFSET,
+		.mask = GENMASK(7, 0) & ~BIT(6),
+		.mode = 0444,
+	},
+	{
+		.label = "reset_line_card_pwr_en",
+		.reg = MLXREG_LC_REG_RESET_CAUSE_OFFSET,
+		.mask = GENMASK(7, 0) & ~BIT(7),
+		.mode = 0444,
+	},
+	{
+		.label = "cpld_upgrade_en",
+		.reg = MLXREG_LC_REG_FIELD_UPGRADE,
+		.mask = GENMASK(7, 0) & ~BIT(0),
+		.mode = 0644,
+		.secured = 1,
+	},
+	{
+		.label = "fpga_upgrade_en",
+		.reg = MLXREG_LC_REG_FIELD_UPGRADE,
+		.mask = GENMASK(7, 0) & ~BIT(1),
+		.mode = 0644,
+		.secured = 1,
+	},
+	{
+		.label = "qsfp_pwr_en",
+		.reg = MLXREG_LC_REG_GP0_OFFSET,
+		.mask = GENMASK(7, 0) & ~BIT(0),
+		.mode = 0644,
+	},
+	{
+		.label = "vpd_wp",
+		.reg = MLXREG_LC_REG_GP0_OFFSET,
+		.mask = GENMASK(7, 0) & ~BIT(3),
+		.mode = 0644,
+		.secured = 1,
+	},
+	{
+		.label = "agb_spi_burn_en",
+		.reg = MLXREG_LC_REG_GP0_OFFSET,
+		.mask = GENMASK(7, 0) & ~BIT(5),
+		.mode = 0644,
+		.secured = 1,
+	},
+	{
+		.label = "fpga_spi_burn_en",
+		.reg = MLXREG_LC_REG_GP0_OFFSET,
+		.mask = GENMASK(7, 0) & ~BIT(6),
+		.mode = 0644,
+		.secured = 1,
+	},
+	{
+		.label = "max_power",
+		.reg = MLXREG_LC_REG_MAX_POWER_OFFSET,
+		.bit = GENMASK(15, 0),
+		.mode = 0444,
+		.regnum = 2,
+	},
+	{
+		.label = "config",
+		.reg = MLXREG_LC_REG_CONFIG_OFFSET,
+		.bit = GENMASK(15, 0),
+		.mode = 0444,
+		.regnum = 2,
+	},
+};
+
+static struct mlxreg_core_platform_data mlxreg_lc_regs_io = {
+	.data = mlxreg_lc_io_data,
+	.counter = ARRAY_SIZE(mlxreg_lc_io_data),
+};
+
+static int
+mlxreg_lc_create_static_devices(struct mlxreg_lc *mlxreg_lc, struct mlxreg_hotplug_device *devs,
+				int size)
+{
+	struct mlxreg_hotplug_device *dev = devs;
+	int i, ret;
+
+	/* Create static I2C device feeding by auxiliary or main power. */
+	for (i = 0; i < size; i++, dev++) {
+		dev->client = i2c_new_client_device(dev->adapter, dev->brdinfo);
+		if (IS_ERR(dev->client)) {
+			dev_err(mlxreg_lc->dev, "Failed to create client %s at bus %d at addr 0x%02x\n",
+				dev->brdinfo->type, dev->nr, dev->brdinfo->addr);
+
+			dev->adapter = NULL;
+			ret = PTR_ERR(dev->client);
+			goto fail_create_static_devices;
+		}
+	}
+
+	return 0;
+
+fail_create_static_devices:
+	while (--i >= 0) {
+		dev = devs + i;
+		i2c_unregister_device(dev->client);
+		dev->client = NULL;
+	}
+	return ret;
+}
+
+static void
+mlxreg_lc_destroy_static_devices(struct mlxreg_lc *mlxreg_lc, struct mlxreg_hotplug_device *devs,
+				 int size)
+{
+	struct mlxreg_hotplug_device *dev = devs;
+	int i;
+
+	/* Destroy static I2C device feeding by auxiliary or main power. */
+	for (i = 0; i < size; i++, dev++) {
+		if (dev->client) {
+			i2c_unregister_device(dev->client);
+			dev->client = NULL;
+		}
+	}
+}
+
+static int mlxreg_lc_power_on_off(struct mlxreg_lc *mlxreg_lc, u8 action)
+{
+	u32 regval;
+	int err;
+
+	err = regmap_read(mlxreg_lc->par_regmap, mlxreg_lc->data->reg_pwr, &regval);
+	if (err)
+		goto regmap_read_fail;
+
+	if (action)
+		regval |= BIT(mlxreg_lc->data->slot - 1);
+	else
+		regval &= ~BIT(mlxreg_lc->data->slot - 1);
+
+	err = regmap_write(mlxreg_lc->par_regmap, mlxreg_lc->data->reg_pwr, regval);
+
+regmap_read_fail:
+	return err;
+}
+
+static int mlxreg_lc_enable_disable(struct mlxreg_lc *mlxreg_lc, bool action)
+{
+	u32 regval;
+	int err;
+
+	/*
+	 * Hardware holds the line card after powering on in the disabled state. Holding line card
+	 * in disabled state protects access to the line components, like FPGA and gearboxes.
+	 * Line card should be enabled in order to get it in operational state. Line card could be
+	 * disabled for moving it to non-operational state. Enabling line card does not affect the
+	 * line card which is already has been enabled. Disabling does not affect the disabled line
+	 * card.
+	 */
+	err = regmap_read(mlxreg_lc->par_regmap, mlxreg_lc->data->reg_ena, &regval);
+	if (err)
+		goto regmap_read_fail;
+
+	if (action)
+		regval |= BIT(mlxreg_lc->data->slot - 1);
+	else
+		regval &= ~BIT(mlxreg_lc->data->slot - 1);
+
+	err = regmap_write(mlxreg_lc->par_regmap, mlxreg_lc->data->reg_ena, regval);
+
+regmap_read_fail:
+	return err;
+}
+
+static int
+mlxreg_lc_sn4800_c16_config_init(struct mlxreg_lc *mlxreg_lc, void *regmap,
+				 struct mlxreg_core_data *data)
+{
+	struct device *dev = &data->hpdev.client->dev;
+
+	/* Set line card configuration according to the type. */
+	mlxreg_lc->mux_data = mlxreg_lc_mux_data;
+	mlxreg_lc->io_data = &mlxreg_lc_regs_io;
+	mlxreg_lc->led_data = &mlxreg_lc_led;
+	mlxreg_lc->mux_brdinfo = &mlxreg_lc_mux_brdinfo;
+
+	mlxreg_lc->aux_devs = devm_kmemdup(dev, mlxreg_lc_aux_pwr_brdinfo,
+					   sizeof(mlxreg_lc_aux_pwr_brdinfo), GFP_KERNEL);
+	if (!mlxreg_lc->aux_devs)
+		return -ENOMEM;
+	mlxreg_lc->aux_devs_num = ARRAY_SIZE(mlxreg_lc_aux_pwr_brdinfo);
+	mlxreg_lc->main_devs = devm_kmemdup(dev, mlxreg_lc_main_pwr_brdinfo,
+					    sizeof(mlxreg_lc_main_pwr_brdinfo), GFP_KERNEL);
+	if (!mlxreg_lc->main_devs)
+		return -ENOMEM;
+	mlxreg_lc->main_devs_num = ARRAY_SIZE(mlxreg_lc_main_pwr_brdinfo);
+
+	return 0;
+}
+
+static void
+mlxreg_lc_state_update(struct mlxreg_lc *mlxreg_lc, enum mlxreg_lc_state state, u8 action)
+{
+	if (action)
+		mlxreg_lc->state |= state;
+	else
+		mlxreg_lc->state &= ~state;
+}
+
+static void
+mlxreg_lc_state_update_locked(struct mlxreg_lc *mlxreg_lc, enum mlxreg_lc_state state, u8 action)
+{
+	mutex_lock(&mlxreg_lc->lock);
+
+	if (action)
+		mlxreg_lc->state |= state;
+	else
+		mlxreg_lc->state &= ~state;
+
+	mutex_unlock(&mlxreg_lc->lock);
+}
+
+/*
+ * Callback is to be called from mlxreg-hotplug driver to notify about line card about received
+ * event.
+ */
+static int mlxreg_lc_event_handler(void *handle, enum mlxreg_hotplug_kind kind, u8 action)
+{
+	struct mlxreg_lc *mlxreg_lc = handle;
+	int err = 0;
+
+	dev_info(mlxreg_lc->dev, "linecard#%d state %d event kind %d action %d\n",
+		 mlxreg_lc->data->slot, mlxreg_lc->state, kind, action);
+
+	mutex_lock(&mlxreg_lc->lock);
+	if (!(mlxreg_lc->state & MLXREG_LC_INITIALIZED))
+		goto mlxreg_lc_non_initialzed_exit;
+
+	switch (kind) {
+	case MLXREG_HOTPLUG_LC_SYNCED:
+		/*
+		 * Synchronization event - hardware and firmware are synchronized. Power on/off
+		 * line card - to allow/disallow main power source.
+		 */
+		mlxreg_lc_state_update(mlxreg_lc, MLXREG_LC_SYNCED, action);
+		/* Power line card if it is not powered yet. */
+		if (!(mlxreg_lc->state & MLXREG_LC_POWERED) && action) {
+			err = mlxreg_lc_power_on_off(mlxreg_lc, 1);
+			if (err)
+				goto mlxreg_lc_power_on_off_fail;
+		}
+		/* In case line card is configured - enable it. */
+		if (mlxreg_lc->state & MLXREG_LC_CONFIGURED && action)
+			err = mlxreg_lc_enable_disable(mlxreg_lc, 1);
+		break;
+	case MLXREG_HOTPLUG_LC_POWERED:
+		/* Power event - attach or de-attach line card device feeding by the main power. */
+		if (action) {
+			/* Do not create devices, if line card is already powered. */
+			if (mlxreg_lc->state & MLXREG_LC_POWERED) {
+				/* In case line card is configured - enable it. */
+				if (mlxreg_lc->state & MLXREG_LC_CONFIGURED)
+					err = mlxreg_lc_enable_disable(mlxreg_lc, 1);
+
+				goto mlxreg_lc_enable_disable_exit;
+			}
+			err = mlxreg_lc_create_static_devices(mlxreg_lc, mlxreg_lc->main_devs,
+							      mlxreg_lc->main_devs_num);
+			if (err)
+				goto mlxreg_lc_create_static_devices_fail;
+
+			/* In case line card is already in ready state - enable it. */
+			if (mlxreg_lc->state & MLXREG_LC_CONFIGURED)
+				err = mlxreg_lc_enable_disable(mlxreg_lc, 1);
+		} else {
+			mlxreg_lc_destroy_static_devices(mlxreg_lc, mlxreg_lc->main_devs,
+							 mlxreg_lc->main_devs_num);
+		}
+		mlxreg_lc_state_update(mlxreg_lc, MLXREG_LC_POWERED, action);
+		break;
+	case MLXREG_HOTPLUG_LC_READY:
+		/*
+		 * Ready event – enable line card by releasing it from reset or disable it by put
+		 * to reset state.
+		 */
+		err = mlxreg_lc_enable_disable(mlxreg_lc, !!action);
+		break;
+	case MLXREG_HOTPLUG_LC_THERMAL:
+		/* Thermal shutdown event – power off line card. */
+		if (action)
+			err = mlxreg_lc_power_on_off(mlxreg_lc, 0);
+		break;
+	default:
+		break;
+	}
+
+mlxreg_lc_enable_disable_exit:
+mlxreg_lc_power_on_off_fail:
+mlxreg_lc_create_static_devices_fail:
+mlxreg_lc_non_initialzed_exit:
+	mutex_unlock(&mlxreg_lc->lock);
+
+	return err;
+}
+
+/*
+ * Callback is to be called from i2c-mux-mlxcpld driver to indicate that all adapter devices has
+ * been created.
+ */
+static int mlxreg_lc_completion_notify(void *handle, struct i2c_adapter *parent,
+				       struct i2c_adapter *adapters[])
+{
+	struct mlxreg_hotplug_device *main_dev, *aux_dev;
+	struct mlxreg_lc *mlxreg_lc = handle;
+	u32 regval;
+	int i, err;
+
+	/* Update I2C devices feeding by auxiliary power. */
+	aux_dev = mlxreg_lc->aux_devs;
+	for (i = 0; i < mlxreg_lc->aux_devs_num; i++, aux_dev++) {
+		aux_dev->adapter = adapters[aux_dev->nr];
+		aux_dev->nr = adapters[aux_dev->nr]->nr;
+	}
+
+	err = mlxreg_lc_create_static_devices(mlxreg_lc, mlxreg_lc->aux_devs,
+					      mlxreg_lc->aux_devs_num);
+	if (err)
+		return err;
+
+	/* Update I2C devices feeding by main power. */
+	main_dev = mlxreg_lc->main_devs;
+	for (i = 0; i < mlxreg_lc->main_devs_num; i++, main_dev++) {
+		main_dev->adapter = adapters[main_dev->nr];
+		main_dev->nr = adapters[main_dev->nr]->nr;
+	}
+
+	/* Verify if line card is powered. */
+	err = regmap_read(mlxreg_lc->par_regmap, mlxreg_lc->data->reg_pwr, &regval);
+	if (err)
+		goto mlxreg_lc_regmap_read_power_fail;
+
+	if (regval & mlxreg_lc->data->mask) {
+		err = mlxreg_lc_create_static_devices(mlxreg_lc, mlxreg_lc->main_devs,
+						      mlxreg_lc->main_devs_num);
+		if (err)
+			goto mlxreg_lc_create_static_devices_failed;
+
+		mlxreg_lc_state_update_locked(mlxreg_lc, MLXREG_LC_POWERED, 1);
+	}
+
+	/* Verify if line card is synchronized. */
+	err = regmap_read(mlxreg_lc->par_regmap, mlxreg_lc->data->reg_sync, &regval);
+	if (err)
+		goto mlxreg_lc_regmap_read_sync_fail;
+
+	/* Power on line card if necessary. */
+	if (regval & mlxreg_lc->data->mask) {
+		mlxreg_lc->state |= MLXREG_LC_SYNCED;
+		mlxreg_lc_state_update_locked(mlxreg_lc, MLXREG_LC_SYNCED, 1);
+		if (mlxreg_lc->state & ~MLXREG_LC_POWERED) {
+			err = mlxreg_lc_power_on_off(mlxreg_lc, 1);
+			if (err)
+				goto mlxreg_lc_regmap_power_on_off_fail;
+		}
+	}
+
+	mlxreg_lc_state_update_locked(mlxreg_lc, MLXREG_LC_INITIALIZED, 1);
+
+	return 0;
+
+mlxreg_lc_regmap_power_on_off_fail:
+mlxreg_lc_regmap_read_sync_fail:
+	if (mlxreg_lc->state & MLXREG_LC_POWERED)
+		mlxreg_lc_destroy_static_devices(mlxreg_lc, mlxreg_lc->main_devs,
+						 mlxreg_lc->main_devs_num);
+mlxreg_lc_create_static_devices_failed:
+	mlxreg_lc_destroy_static_devices(mlxreg_lc, mlxreg_lc->aux_devs, mlxreg_lc->aux_devs_num);
+mlxreg_lc_regmap_read_power_fail:
+	return err;
+}
+
+static int
+mlxreg_lc_config_init(struct mlxreg_lc *mlxreg_lc, void *regmap,
+		      struct mlxreg_core_data *data)
+{
+	struct device *dev = &data->hpdev.client->dev;
+	int lsb, err;
+	u32 regval;
+
+	/* Validate line card type. */
+	err = regmap_read(regmap, MLXREG_LC_REG_CONFIG_OFFSET, &lsb);
+	err = (!err) ? regmap_read(regmap, MLXREG_LC_REG_CONFIG_OFFSET, &regval) : err;
+	if (err)
+		return err;
+	regval = (regval & GENMASK(7, 0)) << 8 | (lsb & GENMASK(7, 0));
+	switch (regval) {
+	case MLXREG_LC_SN4800_C16:
+		err = mlxreg_lc_sn4800_c16_config_init(mlxreg_lc, regmap, data);
+		if (err) {
+			dev_err(dev, "Failed to config client %s at bus %d at addr 0x%02x\n",
+				data->hpdev.brdinfo->type, data->hpdev.nr,
+				data->hpdev.brdinfo->addr);
+			return err;
+		}
+		break;
+	default:
+		return -ENODEV;
+	}
+
+	/* Create mux infrastructure. */
+	mlxreg_lc->mux_data->handle = mlxreg_lc;
+	mlxreg_lc->mux_data->completion_notify = mlxreg_lc_completion_notify;
+	mlxreg_lc->mux_brdinfo->platform_data = mlxreg_lc->mux_data;
+	mlxreg_lc->mux = platform_device_register_resndata(dev, "i2c-mux-mlxcpld", data->hpdev.nr,
+							   NULL, 0, mlxreg_lc->mux_data,
+							   sizeof(*mlxreg_lc->mux_data));
+	if (IS_ERR(mlxreg_lc->mux)) {
+		dev_err(dev, "Failed to create mux infra for client %s at bus %d at addr 0x%02x\n",
+			data->hpdev.brdinfo->type, data->hpdev.nr, data->hpdev.brdinfo->addr);
+		return PTR_ERR(mlxreg_lc->mux);
+	}
+
+	/* Register IO access driver. */
+	if (mlxreg_lc->io_data) {
+		mlxreg_lc->io_data->regmap = regmap;
+		mlxreg_lc->io_regs =
+		platform_device_register_resndata(dev, "mlxreg-io", data->hpdev.nr, NULL, 0,
+						  mlxreg_lc->io_data, sizeof(*mlxreg_lc->io_data));
+		if (IS_ERR(mlxreg_lc->io_regs)) {
+			dev_err(dev, "Failed to create regio for client %s at bus %d at addr 0x%02x\n",
+				data->hpdev.brdinfo->type, data->hpdev.nr,
+				data->hpdev.brdinfo->addr);
+			err = PTR_ERR(mlxreg_lc->io_regs);
+			goto fail_register_io;
+		}
+	}
+
+	/* Register LED driver. */
+	if (mlxreg_lc->led_data) {
+		mlxreg_lc->led_data->regmap = regmap;
+		mlxreg_lc->led =
+		platform_device_register_resndata(dev, "leds-mlxreg", data->hpdev.nr, NULL, 0,
+						  mlxreg_lc->led_data,
+						  sizeof(*mlxreg_lc->led_data));
+		if (IS_ERR(mlxreg_lc->led)) {
+			dev_err(dev, "Failed to create LED objects for client %s at bus %d at addr 0x%02x\n",
+				data->hpdev.brdinfo->type, data->hpdev.nr,
+				data->hpdev.brdinfo->addr);
+			err = PTR_ERR(mlxreg_lc->led);
+			goto fail_register_led;
+		}
+	}
+
+	return 0;
+
+fail_register_led:
+	if (mlxreg_lc->io_regs)
+		platform_device_unregister(mlxreg_lc->io_regs);
+fail_register_io:
+	if (mlxreg_lc->mux)
+		platform_device_unregister(mlxreg_lc->mux);
+
+	return err;
+}
+
+static void mlxreg_lc_config_exit(struct mlxreg_lc *mlxreg_lc)
+{
+	/* Unregister LED driver. */
+	if (mlxreg_lc->led)
+		platform_device_unregister(mlxreg_lc->led);
+	/* Unregister IO access driver. */
+	if (mlxreg_lc->io_regs)
+		platform_device_unregister(mlxreg_lc->io_regs);
+	/* Remove mux infrastructure. */
+	if (mlxreg_lc->mux)
+		platform_device_unregister(mlxreg_lc->mux);
+}
+
+static int mlxreg_lc_probe(struct platform_device *pdev)
+{
+	struct mlxreg_core_hotplug_platform_data *par_pdata;
+	struct mlxreg_core_data *data;
+	struct mlxreg_lc *mlxreg_lc;
+	void *regmap;
+	int i, err;
+
+	data = dev_get_platdata(&pdev->dev);
+	if (!data)
+		return -EINVAL;
+
+	mlxreg_lc = devm_kzalloc(&pdev->dev, sizeof(*mlxreg_lc), GFP_KERNEL);
+	if (!mlxreg_lc)
+		return -ENOMEM;
+
+	mutex_init(&mlxreg_lc->lock);
+	/* Set event notification callback. */
+	data->notifier->user_handler = mlxreg_lc_event_handler;
+	data->notifier->handle = mlxreg_lc;
+
+	data->hpdev.adapter = i2c_get_adapter(data->hpdev.nr);
+	if (!data->hpdev.adapter) {
+		dev_err(&pdev->dev, "Failed to get adapter for bus %d\n",
+			data->hpdev.nr);
+		err = -EFAULT;
+		goto i2c_get_adapter_fail;
+	}
+
+	/* Create device at the top of line card I2C tree.*/
+	data->hpdev.client = i2c_new_client_device(data->hpdev.adapter,
+						   data->hpdev.brdinfo);
+	if (IS_ERR(data->hpdev.client)) {
+		dev_err(&pdev->dev, "Failed to create client %s at bus %d at addr 0x%02x\n",
+			data->hpdev.brdinfo->type, data->hpdev.nr, data->hpdev.brdinfo->addr);
+		err = PTR_ERR(data->hpdev.client);
+		goto i2c_new_device_fail;
+	}
+
+	regmap = devm_regmap_init_i2c(data->hpdev.client,
+				      &mlxreg_lc_regmap_conf);
+	if (IS_ERR(regmap)) {
+		dev_err(&pdev->dev, "Failed to create regmap for client %s at bus %d at addr 0x%02x\n",
+			data->hpdev.brdinfo->type, data->hpdev.nr, data->hpdev.brdinfo->addr);
+		err = PTR_ERR(regmap);
+		goto devm_regmap_init_i2c_fail;
+	}
+
+	/* Set default registers. */
+	for (i = 0; i < mlxreg_lc_regmap_conf.num_reg_defaults; i++) {
+		err = regmap_write(regmap, mlxreg_lc_regmap_default[i].reg,
+				   mlxreg_lc_regmap_default[i].def);
+		if (err) {
+			dev_err(&pdev->dev, "Failed to set default regmap %d for client %s at bus %d at addr 0x%02x\n",
+				i, data->hpdev.brdinfo->type, data->hpdev.nr,
+				data->hpdev.brdinfo->addr);
+			goto regmap_write_fail;
+		}
+	}
+
+	/* Sync registers with hardware. */
+	regcache_mark_dirty(regmap);
+	err = regcache_sync(regmap);
+	if (err) {
+		dev_err(&pdev->dev, "Failed to sync regmap for client %s at bus %d at addr 0x%02x\n",
+			data->hpdev.brdinfo->type, data->hpdev.nr, data->hpdev.brdinfo->addr);
+		goto regcache_sync_fail;
+	}
+
+	par_pdata = data->hpdev.brdinfo->platform_data;
+	mlxreg_lc->par_regmap = par_pdata->regmap;
+	mlxreg_lc->data = data;
+	mlxreg_lc->dev = &pdev->dev;
+	platform_set_drvdata(pdev, mlxreg_lc);
+
+	/* Configure line card. */
+	err = mlxreg_lc_config_init(mlxreg_lc, regmap, data);
+	if (err)
+		goto mlxreg_lc_config_init_fail;
+
+	return 0;
+
+mlxreg_lc_config_init_fail:
+regcache_sync_fail:
+regmap_write_fail:
+devm_regmap_init_i2c_fail:
+	i2c_unregister_device(data->hpdev.client);
+	data->hpdev.client = NULL;
+i2c_new_device_fail:
+	i2c_put_adapter(data->hpdev.adapter);
+	data->hpdev.adapter = NULL;
+i2c_get_adapter_fail:
+	/* Clear event notification callback and handle. */
+	if (data->notifier) {
+		data->notifier->user_handler = NULL;
+		data->notifier->handle = NULL;
+	}
+	return err;
+}
+
+static int mlxreg_lc_remove(struct platform_device *pdev)
+{
+	struct mlxreg_core_data *data = dev_get_platdata(&pdev->dev);
+	struct mlxreg_lc *mlxreg_lc = platform_get_drvdata(pdev);
+
+	mlxreg_lc_state_update_locked(mlxreg_lc, MLXREG_LC_INITIALIZED, 0);
+
+	/*
+	 * Probing and removing are invoked by hotplug events raised upon line card insertion and
+	 * removing. If probing procedure fails all data is cleared. However, hotplug event still
+	 * will be raised on line card removing and activate removing procedure. In this case there
+	 * is nothing to remove.
+	 */
+	if (!data->notifier || !data->notifier->handle)
+		return 0;
+
+	/* Clear event notification callback and handle. */
+	data->notifier->user_handler = NULL;
+	data->notifier->handle = NULL;
+
+	/* Destroy static I2C device feeding by main power. */
+	mlxreg_lc_destroy_static_devices(mlxreg_lc, mlxreg_lc->main_devs,
+					 mlxreg_lc->main_devs_num);
+	/* Destroy static I2C device feeding by auxiliary power. */
+	mlxreg_lc_destroy_static_devices(mlxreg_lc, mlxreg_lc->aux_devs, mlxreg_lc->aux_devs_num);
+	/* Unregister underlying drivers. */
+	mlxreg_lc_config_exit(mlxreg_lc);
+	if (data->hpdev.client) {
+		i2c_unregister_device(data->hpdev.client);
+		data->hpdev.client = NULL;
+		i2c_put_adapter(data->hpdev.adapter);
+		data->hpdev.adapter = NULL;
+	}
+
+	return 0;
+}
+
+static struct platform_driver mlxreg_lc_driver = {
+	.probe = mlxreg_lc_probe,
+	.remove = mlxreg_lc_remove,
+	.driver = {
+		.name = "mlxreg-lc",
+	},
+};
+
+module_platform_driver(mlxreg_lc_driver);
+
+MODULE_AUTHOR("Vadim Pasternak <vadimp@nvidia.com>");
+MODULE_DESCRIPTION("Nvidia line card platform driver");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_ALIAS("platform:mlxreg-lc");