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, 554 insertions, 0 deletions

diff --git a/drivers/regulator/vctrl-regulator.c b/drivers/regulator/vctrl-regulator.c
new file mode 100644
index 000000000..aac7be3b3
--- /dev/null
+++ b/drivers/regulator/vctrl-regulator.c
@@ -0,0 +1,554 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for voltage controller regulators
+ *
+ * Copyright (C) 2017 Google, Inc.
+ */
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/regulator/coupler.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/sort.h>
+
+#include "internal.h"
+
+struct vctrl_voltage_range {
+	int min_uV;
+	int max_uV;
+};
+
+struct vctrl_voltage_ranges {
+	struct vctrl_voltage_range ctrl;
+	struct vctrl_voltage_range out;
+};
+
+struct vctrl_voltage_table {
+	int ctrl;
+	int out;
+	int ovp_min_sel;
+};
+
+struct vctrl_data {
+	struct regulator_dev *rdev;
+	struct regulator_desc desc;
+	bool enabled;
+	unsigned int min_slew_down_rate;
+	unsigned int ovp_threshold;
+	struct vctrl_voltage_ranges vrange;
+	struct vctrl_voltage_table *vtable;
+	unsigned int sel;
+};
+
+static int vctrl_calc_ctrl_voltage(struct vctrl_data *vctrl, int out_uV)
+{
+	struct vctrl_voltage_range *ctrl = &vctrl->vrange.ctrl;
+	struct vctrl_voltage_range *out = &vctrl->vrange.out;
+
+	return ctrl->min_uV +
+		DIV_ROUND_CLOSEST_ULL((s64)(out_uV - out->min_uV) *
+				      (ctrl->max_uV - ctrl->min_uV),
+				      out->max_uV - out->min_uV);
+}
+
+static int vctrl_calc_output_voltage(struct vctrl_data *vctrl, int ctrl_uV)
+{
+	struct vctrl_voltage_range *ctrl = &vctrl->vrange.ctrl;
+	struct vctrl_voltage_range *out = &vctrl->vrange.out;
+
+	if (ctrl_uV < 0) {
+		pr_err("vctrl: failed to get control voltage\n");
+		return ctrl_uV;
+	}
+
+	if (ctrl_uV < ctrl->min_uV)
+		return out->min_uV;
+
+	if (ctrl_uV > ctrl->max_uV)
+		return out->max_uV;
+
+	return out->min_uV +
+		DIV_ROUND_CLOSEST_ULL((s64)(ctrl_uV - ctrl->min_uV) *
+				      (out->max_uV - out->min_uV),
+				      ctrl->max_uV - ctrl->min_uV);
+}
+
+static int vctrl_get_voltage(struct regulator_dev *rdev)
+{
+	struct vctrl_data *vctrl = rdev_get_drvdata(rdev);
+	int ctrl_uV;
+
+	if (!rdev->supply)
+		return -EPROBE_DEFER;
+
+	ctrl_uV = regulator_get_voltage_rdev(rdev->supply->rdev);
+
+	return vctrl_calc_output_voltage(vctrl, ctrl_uV);
+}
+
+static int vctrl_set_voltage(struct regulator_dev *rdev,
+			     int req_min_uV, int req_max_uV,
+			     unsigned int *selector)
+{
+	struct vctrl_data *vctrl = rdev_get_drvdata(rdev);
+	int orig_ctrl_uV;
+	int uV;
+	int ret;
+
+	if (!rdev->supply)
+		return -EPROBE_DEFER;
+
+	orig_ctrl_uV = regulator_get_voltage_rdev(rdev->supply->rdev);
+	uV = vctrl_calc_output_voltage(vctrl, orig_ctrl_uV);
+
+	if (req_min_uV >= uV || !vctrl->ovp_threshold)
+		/* voltage rising or no OVP */
+		return regulator_set_voltage_rdev(rdev->supply->rdev,
+			vctrl_calc_ctrl_voltage(vctrl, req_min_uV),
+			vctrl_calc_ctrl_voltage(vctrl, req_max_uV),
+			PM_SUSPEND_ON);
+
+	while (uV > req_min_uV) {
+		int max_drop_uV = (uV * vctrl->ovp_threshold) / 100;
+		int next_uV;
+		int next_ctrl_uV;
+		int delay;
+
+		/* Make sure no infinite loop even in crazy cases */
+		if (max_drop_uV == 0)
+			max_drop_uV = 1;
+
+		next_uV = max_t(int, req_min_uV, uV - max_drop_uV);
+		next_ctrl_uV = vctrl_calc_ctrl_voltage(vctrl, next_uV);
+
+		ret = regulator_set_voltage_rdev(rdev->supply->rdev,
+					    next_ctrl_uV,
+					    next_ctrl_uV,
+					    PM_SUSPEND_ON);
+		if (ret)
+			goto err;
+
+		delay = DIV_ROUND_UP(uV - next_uV, vctrl->min_slew_down_rate);
+		usleep_range(delay, delay + DIV_ROUND_UP(delay, 10));
+
+		uV = next_uV;
+	}
+
+	return 0;
+
+err:
+	/* Try to go back to original voltage */
+	regulator_set_voltage_rdev(rdev->supply->rdev, orig_ctrl_uV, orig_ctrl_uV,
+				   PM_SUSPEND_ON);
+
+	return ret;
+}
+
+static int vctrl_get_voltage_sel(struct regulator_dev *rdev)
+{
+	struct vctrl_data *vctrl = rdev_get_drvdata(rdev);
+
+	return vctrl->sel;
+}
+
+static int vctrl_set_voltage_sel(struct regulator_dev *rdev,
+				 unsigned int selector)
+{
+	struct vctrl_data *vctrl = rdev_get_drvdata(rdev);
+	unsigned int orig_sel = vctrl->sel;
+	int ret;
+
+	if (!rdev->supply)
+		return -EPROBE_DEFER;
+
+	if (selector >= rdev->desc->n_voltages)
+		return -EINVAL;
+
+	if (selector >= vctrl->sel || !vctrl->ovp_threshold) {
+		/* voltage rising or no OVP */
+		ret = regulator_set_voltage_rdev(rdev->supply->rdev,
+					    vctrl->vtable[selector].ctrl,
+					    vctrl->vtable[selector].ctrl,
+					    PM_SUSPEND_ON);
+		if (!ret)
+			vctrl->sel = selector;
+
+		return ret;
+	}
+
+	while (vctrl->sel != selector) {
+		unsigned int next_sel;
+		int delay;
+
+		next_sel = max_t(unsigned int, selector, vctrl->vtable[vctrl->sel].ovp_min_sel);
+
+		ret = regulator_set_voltage_rdev(rdev->supply->rdev,
+					    vctrl->vtable[next_sel].ctrl,
+					    vctrl->vtable[next_sel].ctrl,
+					    PM_SUSPEND_ON);
+		if (ret) {
+			dev_err(&rdev->dev,
+				"failed to set control voltage to %duV\n",
+				vctrl->vtable[next_sel].ctrl);
+			goto err;
+		}
+		vctrl->sel = next_sel;
+
+		delay = DIV_ROUND_UP(vctrl->vtable[vctrl->sel].out -
+				     vctrl->vtable[next_sel].out,
+				     vctrl->min_slew_down_rate);
+		usleep_range(delay, delay + DIV_ROUND_UP(delay, 10));
+	}
+
+	return 0;
+
+err:
+	if (vctrl->sel != orig_sel) {
+		/* Try to go back to original voltage */
+		if (!regulator_set_voltage_rdev(rdev->supply->rdev,
+					   vctrl->vtable[orig_sel].ctrl,
+					   vctrl->vtable[orig_sel].ctrl,
+					   PM_SUSPEND_ON))
+			vctrl->sel = orig_sel;
+		else
+			dev_warn(&rdev->dev,
+				 "failed to restore original voltage\n");
+	}
+
+	return ret;
+}
+
+static int vctrl_list_voltage(struct regulator_dev *rdev,
+			      unsigned int selector)
+{
+	struct vctrl_data *vctrl = rdev_get_drvdata(rdev);
+
+	if (selector >= rdev->desc->n_voltages)
+		return -EINVAL;
+
+	return vctrl->vtable[selector].out;
+}
+
+static int vctrl_parse_dt(struct platform_device *pdev,
+			  struct vctrl_data *vctrl)
+{
+	int ret;
+	struct device_node *np = pdev->dev.of_node;
+	u32 pval;
+	u32 vrange_ctrl[2];
+
+	ret = of_property_read_u32(np, "ovp-threshold-percent", &pval);
+	if (!ret) {
+		vctrl->ovp_threshold = pval;
+		if (vctrl->ovp_threshold > 100) {
+			dev_err(&pdev->dev,
+				"ovp-threshold-percent (%u) > 100\n",
+				vctrl->ovp_threshold);
+			return -EINVAL;
+		}
+	}
+
+	ret = of_property_read_u32(np, "min-slew-down-rate", &pval);
+	if (!ret) {
+		vctrl->min_slew_down_rate = pval;
+
+		/* We use the value as int and as divider; sanity check */
+		if (vctrl->min_slew_down_rate == 0) {
+			dev_err(&pdev->dev,
+				"min-slew-down-rate must not be 0\n");
+			return -EINVAL;
+		} else if (vctrl->min_slew_down_rate > INT_MAX) {
+			dev_err(&pdev->dev, "min-slew-down-rate (%u) too big\n",
+				vctrl->min_slew_down_rate);
+			return -EINVAL;
+		}
+	}
+
+	if (vctrl->ovp_threshold && !vctrl->min_slew_down_rate) {
+		dev_err(&pdev->dev,
+			"ovp-threshold-percent requires min-slew-down-rate\n");
+		return -EINVAL;
+	}
+
+	ret = of_property_read_u32(np, "regulator-min-microvolt", &pval);
+	if (ret) {
+		dev_err(&pdev->dev,
+			"failed to read regulator-min-microvolt: %d\n", ret);
+		return ret;
+	}
+	vctrl->vrange.out.min_uV = pval;
+
+	ret = of_property_read_u32(np, "regulator-max-microvolt", &pval);
+	if (ret) {
+		dev_err(&pdev->dev,
+			"failed to read regulator-max-microvolt: %d\n", ret);
+		return ret;
+	}
+	vctrl->vrange.out.max_uV = pval;
+
+	ret = of_property_read_u32_array(np, "ctrl-voltage-range", vrange_ctrl,
+					 2);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to read ctrl-voltage-range: %d\n",
+			ret);
+		return ret;
+	}
+
+	if (vrange_ctrl[0] >= vrange_ctrl[1]) {
+		dev_err(&pdev->dev, "ctrl-voltage-range is invalid: %d-%d\n",
+			vrange_ctrl[0], vrange_ctrl[1]);
+		return -EINVAL;
+	}
+
+	vctrl->vrange.ctrl.min_uV = vrange_ctrl[0];
+	vctrl->vrange.ctrl.max_uV = vrange_ctrl[1];
+
+	return 0;
+}
+
+static int vctrl_cmp_ctrl_uV(const void *a, const void *b)
+{
+	const struct vctrl_voltage_table *at = a;
+	const struct vctrl_voltage_table *bt = b;
+
+	return at->ctrl - bt->ctrl;
+}
+
+static int vctrl_init_vtable(struct platform_device *pdev,
+			     struct regulator *ctrl_reg)
+{
+	struct vctrl_data *vctrl = platform_get_drvdata(pdev);
+	struct regulator_desc *rdesc = &vctrl->desc;
+	struct vctrl_voltage_range *vrange_ctrl = &vctrl->vrange.ctrl;
+	int n_voltages;
+	int ctrl_uV;
+	int i, idx_vt;
+
+	n_voltages = regulator_count_voltages(ctrl_reg);
+
+	rdesc->n_voltages = n_voltages;
+
+	/* determine number of steps within the range of the vctrl regulator */
+	for (i = 0; i < n_voltages; i++) {
+		ctrl_uV = regulator_list_voltage(ctrl_reg, i);
+
+		if (ctrl_uV < vrange_ctrl->min_uV ||
+		    ctrl_uV > vrange_ctrl->max_uV)
+			rdesc->n_voltages--;
+	}
+
+	if (rdesc->n_voltages == 0) {
+		dev_err(&pdev->dev, "invalid configuration\n");
+		return -EINVAL;
+	}
+
+	vctrl->vtable = devm_kcalloc(&pdev->dev, rdesc->n_voltages,
+				     sizeof(struct vctrl_voltage_table),
+				     GFP_KERNEL);
+	if (!vctrl->vtable)
+		return -ENOMEM;
+
+	/* create mapping control <=> output voltage */
+	for (i = 0, idx_vt = 0; i < n_voltages; i++) {
+		ctrl_uV = regulator_list_voltage(ctrl_reg, i);
+
+		if (ctrl_uV < vrange_ctrl->min_uV ||
+		    ctrl_uV > vrange_ctrl->max_uV)
+			continue;
+
+		vctrl->vtable[idx_vt].ctrl = ctrl_uV;
+		vctrl->vtable[idx_vt].out =
+			vctrl_calc_output_voltage(vctrl, ctrl_uV);
+		idx_vt++;
+	}
+
+	/* we rely on the table to be ordered by ascending voltage */
+	sort(vctrl->vtable, rdesc->n_voltages,
+	     sizeof(struct vctrl_voltage_table), vctrl_cmp_ctrl_uV,
+	     NULL);
+
+	/* pre-calculate OVP-safe downward transitions */
+	for (i = rdesc->n_voltages - 1; i > 0; i--) {
+		int j;
+		int ovp_min_uV = (vctrl->vtable[i].out *
+				  (100 - vctrl->ovp_threshold)) / 100;
+
+		for (j = 0; j < i; j++) {
+			if (vctrl->vtable[j].out >= ovp_min_uV) {
+				vctrl->vtable[i].ovp_min_sel = j;
+				break;
+			}
+		}
+
+		if (j == i) {
+			dev_warn(&pdev->dev, "switching down from %duV may cause OVP shutdown\n",
+				vctrl->vtable[i].out);
+			/* use next lowest voltage */
+			vctrl->vtable[i].ovp_min_sel = i - 1;
+		}
+	}
+
+	return 0;
+}
+
+static int vctrl_enable(struct regulator_dev *rdev)
+{
+	struct vctrl_data *vctrl = rdev_get_drvdata(rdev);
+
+	vctrl->enabled = true;
+
+	return 0;
+}
+
+static int vctrl_disable(struct regulator_dev *rdev)
+{
+	struct vctrl_data *vctrl = rdev_get_drvdata(rdev);
+
+	vctrl->enabled = false;
+
+	return 0;
+}
+
+static int vctrl_is_enabled(struct regulator_dev *rdev)
+{
+	struct vctrl_data *vctrl = rdev_get_drvdata(rdev);
+
+	return vctrl->enabled;
+}
+
+static const struct regulator_ops vctrl_ops_cont = {
+	.enable		  = vctrl_enable,
+	.disable	  = vctrl_disable,
+	.is_enabled	  = vctrl_is_enabled,
+	.get_voltage	  = vctrl_get_voltage,
+	.set_voltage	  = vctrl_set_voltage,
+};
+
+static const struct regulator_ops vctrl_ops_non_cont = {
+	.enable		  = vctrl_enable,
+	.disable	  = vctrl_disable,
+	.is_enabled	  = vctrl_is_enabled,
+	.set_voltage_sel = vctrl_set_voltage_sel,
+	.get_voltage_sel = vctrl_get_voltage_sel,
+	.list_voltage    = vctrl_list_voltage,
+	.map_voltage     = regulator_map_voltage_iterate,
+};
+
+static int vctrl_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct vctrl_data *vctrl;
+	const struct regulator_init_data *init_data;
+	struct regulator_desc *rdesc;
+	struct regulator_config cfg = { };
+	struct vctrl_voltage_range *vrange_ctrl;
+	struct regulator *ctrl_reg;
+	int ctrl_uV;
+	int ret;
+
+	vctrl = devm_kzalloc(&pdev->dev, sizeof(struct vctrl_data),
+			     GFP_KERNEL);
+	if (!vctrl)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, vctrl);
+
+	ret = vctrl_parse_dt(pdev, vctrl);
+	if (ret)
+		return ret;
+
+	ctrl_reg = devm_regulator_get(&pdev->dev, "ctrl");
+	if (IS_ERR(ctrl_reg))
+		return PTR_ERR(ctrl_reg);
+
+	vrange_ctrl = &vctrl->vrange.ctrl;
+
+	rdesc = &vctrl->desc;
+	rdesc->name = "vctrl";
+	rdesc->type = REGULATOR_VOLTAGE;
+	rdesc->owner = THIS_MODULE;
+	rdesc->supply_name = "ctrl";
+
+	if ((regulator_get_linear_step(ctrl_reg) == 1) ||
+	    (regulator_count_voltages(ctrl_reg) == -EINVAL)) {
+		rdesc->continuous_voltage_range = true;
+		rdesc->ops = &vctrl_ops_cont;
+	} else {
+		rdesc->ops = &vctrl_ops_non_cont;
+	}
+
+	init_data = of_get_regulator_init_data(&pdev->dev, np, rdesc);
+	if (!init_data)
+		return -ENOMEM;
+
+	cfg.of_node = np;
+	cfg.dev = &pdev->dev;
+	cfg.driver_data = vctrl;
+	cfg.init_data = init_data;
+
+	if (!rdesc->continuous_voltage_range) {
+		ret = vctrl_init_vtable(pdev, ctrl_reg);
+		if (ret)
+			return ret;
+
+		/* Use locked consumer API when not in regulator framework */
+		ctrl_uV = regulator_get_voltage(ctrl_reg);
+		if (ctrl_uV < 0) {
+			dev_err(&pdev->dev, "failed to get control voltage\n");
+			return ctrl_uV;
+		}
+
+		/* determine current voltage selector from control voltage */
+		if (ctrl_uV < vrange_ctrl->min_uV) {
+			vctrl->sel = 0;
+		} else if (ctrl_uV > vrange_ctrl->max_uV) {
+			vctrl->sel = rdesc->n_voltages - 1;
+		} else {
+			int i;
+
+			for (i = 0; i < rdesc->n_voltages; i++) {
+				if (ctrl_uV == vctrl->vtable[i].ctrl) {
+					vctrl->sel = i;
+					break;
+				}
+			}
+		}
+	}
+
+	/* Drop ctrl-supply here in favor of regulator core managed supply */
+	devm_regulator_put(ctrl_reg);
+
+	vctrl->rdev = devm_regulator_register(&pdev->dev, rdesc, &cfg);
+	if (IS_ERR(vctrl->rdev)) {
+		ret = PTR_ERR(vctrl->rdev);
+		dev_err(&pdev->dev, "failed to register regulator: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct of_device_id vctrl_of_match[] = {
+	{ .compatible = "vctrl-regulator", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, vctrl_of_match);
+
+static struct platform_driver vctrl_driver = {
+	.probe		= vctrl_probe,
+	.driver		= {
+		.name		= "vctrl-regulator",
+		.of_match_table = of_match_ptr(vctrl_of_match),
+	},
+};
+
+module_platform_driver(vctrl_driver);
+
+MODULE_DESCRIPTION("Voltage Controlled Regulator Driver");
+MODULE_AUTHOR("Matthias Kaehlcke <mka@chromium.org>");
+MODULE_LICENSE("GPL v2");