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, 459 insertions, 0 deletions

diff --git a/drivers/regulator/lp3971.c b/drivers/regulator/lp3971.c
new file mode 100644
index 000000000..8be252f81
--- /dev/null
+++ b/drivers/regulator/lp3971.c
@@ -0,0 +1,459 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Regulator driver for National Semiconductors LP3971 PMIC chip
+ *
+ *  Copyright (C) 2009 Samsung Electronics
+ *  Author: Marek Szyprowski <m.szyprowski@samsung.com>
+ *
+ * Based on wm8350.c
+ */
+
+#include <linux/bug.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/lp3971.h>
+#include <linux/slab.h>
+
+struct lp3971 {
+	struct device *dev;
+	struct mutex io_lock;
+	struct i2c_client *i2c;
+};
+
+static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg);
+static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val);
+
+#define LP3971_SYS_CONTROL1_REG 0x07
+
+/* System control register 1 initial value,
+   bits 4 and 5 are EPROM programmable */
+#define SYS_CONTROL1_INIT_VAL 0x40
+#define SYS_CONTROL1_INIT_MASK 0xCF
+
+#define LP3971_BUCK_VOL_ENABLE_REG 0x10
+#define LP3971_BUCK_VOL_CHANGE_REG 0x20
+
+/*	Voltage control registers shift:
+	LP3971_BUCK1 -> 0
+	LP3971_BUCK2 -> 4
+	LP3971_BUCK3 -> 6
+*/
+#define BUCK_VOL_CHANGE_SHIFT(x) (((!!x) << 2) | (x & ~0x01))
+#define BUCK_VOL_CHANGE_FLAG_GO 0x01
+#define BUCK_VOL_CHANGE_FLAG_TARGET 0x02
+#define BUCK_VOL_CHANGE_FLAG_MASK 0x03
+
+#define LP3971_BUCK1_BASE 0x23
+#define LP3971_BUCK2_BASE 0x29
+#define LP3971_BUCK3_BASE 0x32
+
+static const int buck_base_addr[] = {
+	LP3971_BUCK1_BASE,
+	LP3971_BUCK2_BASE,
+	LP3971_BUCK3_BASE,
+};
+
+#define LP3971_BUCK_TARGET_VOL1_REG(x) (buck_base_addr[x])
+#define LP3971_BUCK_TARGET_VOL2_REG(x) (buck_base_addr[x]+1)
+
+static const unsigned int buck_voltage_map[] = {
+	      0,  800000,  850000,  900000,  950000, 1000000, 1050000, 1100000,
+	1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000,
+	1550000, 1600000, 1650000, 1700000, 1800000, 1900000, 2500000, 2800000,
+	3000000, 3300000,
+};
+
+#define BUCK_TARGET_VOL_MASK 0x3f
+
+#define LP3971_BUCK_RAMP_REG(x)	(buck_base_addr[x]+2)
+
+#define LP3971_LDO_ENABLE_REG 0x12
+#define LP3971_LDO_VOL_CONTR_BASE 0x39
+
+/*	Voltage control registers:
+	LP3971_LDO1 -> LP3971_LDO_VOL_CONTR_BASE + 0
+	LP3971_LDO2 -> LP3971_LDO_VOL_CONTR_BASE + 0
+	LP3971_LDO3 -> LP3971_LDO_VOL_CONTR_BASE + 1
+	LP3971_LDO4 -> LP3971_LDO_VOL_CONTR_BASE + 1
+	LP3971_LDO5 -> LP3971_LDO_VOL_CONTR_BASE + 2
+*/
+#define LP3971_LDO_VOL_CONTR_REG(x)	(LP3971_LDO_VOL_CONTR_BASE + (x >> 1))
+
+/*	Voltage control registers shift:
+	LP3971_LDO1 -> 0, LP3971_LDO2 -> 4
+	LP3971_LDO3 -> 0, LP3971_LDO4 -> 4
+	LP3971_LDO5 -> 0
+*/
+#define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2)
+#define LDO_VOL_CONTR_MASK 0x0f
+
+static const unsigned int ldo45_voltage_map[] = {
+	1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 1350000,
+	1400000, 1500000, 1800000, 1900000, 2500000, 2800000, 3000000, 3300000,
+};
+
+static const unsigned int ldo123_voltage_map[] = {
+	1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,
+	2600000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000,
+};
+
+#define LDO_VOL_MIN_IDX 0x00
+#define LDO_VOL_MAX_IDX 0x0f
+
+static int lp3971_ldo_is_enabled(struct regulator_dev *dev)
+{
+	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
+	int ldo = rdev_get_id(dev) - LP3971_LDO1;
+	u16 mask = 1 << (1 + ldo);
+	u16 val;
+
+	val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG);
+	return (val & mask) != 0;
+}
+
+static int lp3971_ldo_enable(struct regulator_dev *dev)
+{
+	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
+	int ldo = rdev_get_id(dev) - LP3971_LDO1;
+	u16 mask = 1 << (1 + ldo);
+
+	return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask);
+}
+
+static int lp3971_ldo_disable(struct regulator_dev *dev)
+{
+	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
+	int ldo = rdev_get_id(dev) - LP3971_LDO1;
+	u16 mask = 1 << (1 + ldo);
+
+	return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0);
+}
+
+static int lp3971_ldo_get_voltage_sel(struct regulator_dev *dev)
+{
+	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
+	int ldo = rdev_get_id(dev) - LP3971_LDO1;
+	u16 val, reg;
+
+	reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo));
+	val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK;
+
+	return val;
+}
+
+static int lp3971_ldo_set_voltage_sel(struct regulator_dev *dev,
+				      unsigned int selector)
+{
+	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
+	int ldo = rdev_get_id(dev) - LP3971_LDO1;
+
+	return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
+			LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),
+			selector << LDO_VOL_CONTR_SHIFT(ldo));
+}
+
+static const struct regulator_ops lp3971_ldo_ops = {
+	.list_voltage = regulator_list_voltage_table,
+	.map_voltage = regulator_map_voltage_ascend,
+	.is_enabled = lp3971_ldo_is_enabled,
+	.enable = lp3971_ldo_enable,
+	.disable = lp3971_ldo_disable,
+	.get_voltage_sel = lp3971_ldo_get_voltage_sel,
+	.set_voltage_sel = lp3971_ldo_set_voltage_sel,
+};
+
+static int lp3971_dcdc_is_enabled(struct regulator_dev *dev)
+{
+	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
+	int buck = rdev_get_id(dev) - LP3971_DCDC1;
+	u16 mask = 1 << (buck * 2);
+	u16 val;
+
+	val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG);
+	return (val & mask) != 0;
+}
+
+static int lp3971_dcdc_enable(struct regulator_dev *dev)
+{
+	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
+	int buck = rdev_get_id(dev) - LP3971_DCDC1;
+	u16 mask = 1 << (buck * 2);
+
+	return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask);
+}
+
+static int lp3971_dcdc_disable(struct regulator_dev *dev)
+{
+	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
+	int buck = rdev_get_id(dev) - LP3971_DCDC1;
+	u16 mask = 1 << (buck * 2);
+
+	return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0);
+}
+
+static int lp3971_dcdc_get_voltage_sel(struct regulator_dev *dev)
+{
+	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
+	int buck = rdev_get_id(dev) - LP3971_DCDC1;
+	u16 reg;
+
+	reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck));
+	reg &= BUCK_TARGET_VOL_MASK;
+
+	return reg;
+}
+
+static int lp3971_dcdc_set_voltage_sel(struct regulator_dev *dev,
+				       unsigned int selector)
+{
+	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
+	int buck = rdev_get_id(dev) - LP3971_DCDC1;
+	int ret;
+
+	ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),
+	       BUCK_TARGET_VOL_MASK, selector);
+	if (ret)
+		return ret;
+
+	ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
+	       BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
+	       BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck));
+	if (ret)
+		return ret;
+
+	return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
+	       BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
+	       0 << BUCK_VOL_CHANGE_SHIFT(buck));
+}
+
+static const struct regulator_ops lp3971_dcdc_ops = {
+	.list_voltage = regulator_list_voltage_table,
+	.map_voltage = regulator_map_voltage_ascend,
+	.is_enabled = lp3971_dcdc_is_enabled,
+	.enable = lp3971_dcdc_enable,
+	.disable = lp3971_dcdc_disable,
+	.get_voltage_sel = lp3971_dcdc_get_voltage_sel,
+	.set_voltage_sel = lp3971_dcdc_set_voltage_sel,
+};
+
+static const struct regulator_desc regulators[] = {
+	{
+		.name = "LDO1",
+		.id = LP3971_LDO1,
+		.ops = &lp3971_ldo_ops,
+		.n_voltages = ARRAY_SIZE(ldo123_voltage_map),
+		.volt_table = ldo123_voltage_map,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "LDO2",
+		.id = LP3971_LDO2,
+		.ops = &lp3971_ldo_ops,
+		.n_voltages = ARRAY_SIZE(ldo123_voltage_map),
+		.volt_table = ldo123_voltage_map,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "LDO3",
+		.id = LP3971_LDO3,
+		.ops = &lp3971_ldo_ops,
+		.n_voltages = ARRAY_SIZE(ldo123_voltage_map),
+		.volt_table = ldo123_voltage_map,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "LDO4",
+		.id = LP3971_LDO4,
+		.ops = &lp3971_ldo_ops,
+		.n_voltages = ARRAY_SIZE(ldo45_voltage_map),
+		.volt_table = ldo45_voltage_map,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "LDO5",
+		.id = LP3971_LDO5,
+		.ops = &lp3971_ldo_ops,
+		.n_voltages = ARRAY_SIZE(ldo45_voltage_map),
+		.volt_table = ldo45_voltage_map,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "DCDC1",
+		.id = LP3971_DCDC1,
+		.ops = &lp3971_dcdc_ops,
+		.n_voltages = ARRAY_SIZE(buck_voltage_map),
+		.volt_table = buck_voltage_map,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "DCDC2",
+		.id = LP3971_DCDC2,
+		.ops = &lp3971_dcdc_ops,
+		.n_voltages = ARRAY_SIZE(buck_voltage_map),
+		.volt_table = buck_voltage_map,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+	},
+	{
+		.name = "DCDC3",
+		.id = LP3971_DCDC3,
+		.ops = &lp3971_dcdc_ops,
+		.n_voltages = ARRAY_SIZE(buck_voltage_map),
+		.volt_table = buck_voltage_map,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+	},
+};
+
+static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count,
+	u16 *dest)
+{
+	int ret;
+
+	if (count != 1)
+		return -EIO;
+	ret = i2c_smbus_read_byte_data(i2c, reg);
+	if (ret < 0)
+		return ret;
+
+	*dest = ret;
+	return 0;
+}
+
+static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count,
+	const u16 *src)
+{
+	if (count != 1)
+		return -EIO;
+	return i2c_smbus_write_byte_data(i2c, reg, *src);
+}
+
+static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg)
+{
+	u16 val = 0;
+
+	mutex_lock(&lp3971->io_lock);
+
+	lp3971_i2c_read(lp3971->i2c, reg, 1, &val);
+
+	dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
+		(unsigned)val&0xff);
+
+	mutex_unlock(&lp3971->io_lock);
+
+	return val & 0xff;
+}
+
+static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val)
+{
+	u16 tmp;
+	int ret;
+
+	mutex_lock(&lp3971->io_lock);
+
+	ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp);
+	if (ret == 0) {
+		tmp = (tmp & ~mask) | val;
+		ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp);
+		dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
+			(unsigned)val&0xff);
+	}
+	mutex_unlock(&lp3971->io_lock);
+
+	return ret;
+}
+
+static int setup_regulators(struct lp3971 *lp3971,
+				      struct lp3971_platform_data *pdata)
+{
+	int i, err;
+
+	/* Instantiate the regulators */
+	for (i = 0; i < pdata->num_regulators; i++) {
+		struct regulator_config config = { };
+		struct lp3971_regulator_subdev *reg = &pdata->regulators[i];
+		struct regulator_dev *rdev;
+
+		config.dev = lp3971->dev;
+		config.init_data = reg->initdata;
+		config.driver_data = lp3971;
+
+		rdev = devm_regulator_register(lp3971->dev,
+					       &regulators[reg->id], &config);
+		if (IS_ERR(rdev)) {
+			err = PTR_ERR(rdev);
+			dev_err(lp3971->dev, "regulator init failed: %d\n",
+				err);
+			return err;
+		}
+	}
+
+	return 0;
+}
+
+static int lp3971_i2c_probe(struct i2c_client *i2c)
+{
+	struct lp3971 *lp3971;
+	struct lp3971_platform_data *pdata = dev_get_platdata(&i2c->dev);
+	int ret;
+	u16 val;
+
+	if (!pdata) {
+		dev_dbg(&i2c->dev, "No platform init data supplied\n");
+		return -ENODEV;
+	}
+
+	lp3971 = devm_kzalloc(&i2c->dev, sizeof(struct lp3971), GFP_KERNEL);
+	if (lp3971 == NULL)
+		return -ENOMEM;
+
+	lp3971->i2c = i2c;
+	lp3971->dev = &i2c->dev;
+
+	mutex_init(&lp3971->io_lock);
+
+	/* Detect LP3971 */
+	ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val);
+	if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL)
+		ret = -ENODEV;
+	if (ret < 0) {
+		dev_err(&i2c->dev, "failed to detect device\n");
+		return ret;
+	}
+
+	ret = setup_regulators(lp3971, pdata);
+	if (ret < 0)
+		return ret;
+
+	i2c_set_clientdata(i2c, lp3971);
+	return 0;
+}
+
+static const struct i2c_device_id lp3971_i2c_id[] = {
+	{ "lp3971", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id);
+
+static struct i2c_driver lp3971_i2c_driver = {
+	.driver = {
+		.name = "LP3971",
+	},
+	.probe_new = lp3971_i2c_probe,
+	.id_table = lp3971_i2c_id,
+};
+
+module_i2c_driver(lp3971_i2c_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");
+MODULE_DESCRIPTION("LP3971 PMIC driver");