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, 627 insertions, 0 deletions

diff --git a/drivers/staging/greybus/gpio.c b/drivers/staging/greybus/gpio.c
new file mode 100644
index 000000000..8a7cf1d0e
--- /dev/null
+++ b/drivers/staging/greybus/gpio.c
@@ -0,0 +1,627 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * GPIO Greybus driver.
+ *
+ * Copyright 2014 Google Inc.
+ * Copyright 2014 Linaro Ltd.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/gpio/driver.h>
+#include <linux/mutex.h>
+#include <linux/greybus.h>
+
+#include "gbphy.h"
+
+struct gb_gpio_line {
+	/* The following has to be an array of line_max entries */
+	/* --> make them just a flags field */
+	u8			active:    1,
+				direction: 1,	/* 0 = output, 1 = input */
+				value:     1;	/* 0 = low, 1 = high */
+	u16			debounce_usec;
+
+	u8			irq_type;
+	bool			irq_type_pending;
+	bool			masked;
+	bool			masked_pending;
+};
+
+struct gb_gpio_controller {
+	struct gbphy_device	*gbphy_dev;
+	struct gb_connection	*connection;
+	u8			line_max;	/* max line number */
+	struct gb_gpio_line	*lines;
+
+	struct gpio_chip	chip;
+	struct irq_chip		irqc;
+	struct mutex		irq_lock;
+};
+#define gpio_chip_to_gb_gpio_controller(chip) \
+	container_of(chip, struct gb_gpio_controller, chip)
+#define irq_data_to_gpio_chip(d) (d->domain->host_data)
+
+static int gb_gpio_line_count_operation(struct gb_gpio_controller *ggc)
+{
+	struct gb_gpio_line_count_response response;
+	int ret;
+
+	ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_LINE_COUNT,
+				NULL, 0, &response, sizeof(response));
+	if (!ret)
+		ggc->line_max = response.count;
+	return ret;
+}
+
+static int gb_gpio_activate_operation(struct gb_gpio_controller *ggc, u8 which)
+{
+	struct gb_gpio_activate_request request;
+	struct gbphy_device *gbphy_dev = ggc->gbphy_dev;
+	int ret;
+
+	ret = gbphy_runtime_get_sync(gbphy_dev);
+	if (ret)
+		return ret;
+
+	request.which = which;
+	ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_ACTIVATE,
+				&request, sizeof(request), NULL, 0);
+	if (ret) {
+		gbphy_runtime_put_autosuspend(gbphy_dev);
+		return ret;
+	}
+
+	ggc->lines[which].active = true;
+
+	return 0;
+}
+
+static void gb_gpio_deactivate_operation(struct gb_gpio_controller *ggc,
+					 u8 which)
+{
+	struct gbphy_device *gbphy_dev = ggc->gbphy_dev;
+	struct device *dev = &gbphy_dev->dev;
+	struct gb_gpio_deactivate_request request;
+	int ret;
+
+	request.which = which;
+	ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_DEACTIVATE,
+				&request, sizeof(request), NULL, 0);
+	if (ret) {
+		dev_err(dev, "failed to deactivate gpio %u\n", which);
+		goto out_pm_put;
+	}
+
+	ggc->lines[which].active = false;
+
+out_pm_put:
+	gbphy_runtime_put_autosuspend(gbphy_dev);
+}
+
+static int gb_gpio_get_direction_operation(struct gb_gpio_controller *ggc,
+					   u8 which)
+{
+	struct device *dev = &ggc->gbphy_dev->dev;
+	struct gb_gpio_get_direction_request request;
+	struct gb_gpio_get_direction_response response;
+	int ret;
+	u8 direction;
+
+	request.which = which;
+	ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_GET_DIRECTION,
+				&request, sizeof(request),
+				&response, sizeof(response));
+	if (ret)
+		return ret;
+
+	direction = response.direction;
+	if (direction && direction != 1) {
+		dev_warn(dev, "gpio %u direction was %u (should be 0 or 1)\n",
+			 which, direction);
+	}
+	ggc->lines[which].direction = direction ? 1 : 0;
+	return 0;
+}
+
+static int gb_gpio_direction_in_operation(struct gb_gpio_controller *ggc,
+					  u8 which)
+{
+	struct gb_gpio_direction_in_request request;
+	int ret;
+
+	request.which = which;
+	ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_DIRECTION_IN,
+				&request, sizeof(request), NULL, 0);
+	if (!ret)
+		ggc->lines[which].direction = 1;
+	return ret;
+}
+
+static int gb_gpio_direction_out_operation(struct gb_gpio_controller *ggc,
+					   u8 which, bool value_high)
+{
+	struct gb_gpio_direction_out_request request;
+	int ret;
+
+	request.which = which;
+	request.value = value_high ? 1 : 0;
+	ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_DIRECTION_OUT,
+				&request, sizeof(request), NULL, 0);
+	if (!ret)
+		ggc->lines[which].direction = 0;
+	return ret;
+}
+
+static int gb_gpio_get_value_operation(struct gb_gpio_controller *ggc,
+				       u8 which)
+{
+	struct device *dev = &ggc->gbphy_dev->dev;
+	struct gb_gpio_get_value_request request;
+	struct gb_gpio_get_value_response response;
+	int ret;
+	u8 value;
+
+	request.which = which;
+	ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_GET_VALUE,
+				&request, sizeof(request),
+				&response, sizeof(response));
+	if (ret) {
+		dev_err(dev, "failed to get value of gpio %u\n", which);
+		return ret;
+	}
+
+	value = response.value;
+	if (value && value != 1) {
+		dev_warn(dev, "gpio %u value was %u (should be 0 or 1)\n",
+			 which, value);
+	}
+	ggc->lines[which].value = value ? 1 : 0;
+	return 0;
+}
+
+static void gb_gpio_set_value_operation(struct gb_gpio_controller *ggc,
+					u8 which, bool value_high)
+{
+	struct device *dev = &ggc->gbphy_dev->dev;
+	struct gb_gpio_set_value_request request;
+	int ret;
+
+	if (ggc->lines[which].direction == 1) {
+		dev_warn(dev, "refusing to set value of input gpio %u\n",
+			 which);
+		return;
+	}
+
+	request.which = which;
+	request.value = value_high ? 1 : 0;
+	ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_SET_VALUE,
+				&request, sizeof(request), NULL, 0);
+	if (ret) {
+		dev_err(dev, "failed to set value of gpio %u\n", which);
+		return;
+	}
+
+	ggc->lines[which].value = request.value;
+}
+
+static int gb_gpio_set_debounce_operation(struct gb_gpio_controller *ggc,
+					  u8 which, u16 debounce_usec)
+{
+	struct gb_gpio_set_debounce_request request;
+	int ret;
+
+	request.which = which;
+	request.usec = cpu_to_le16(debounce_usec);
+	ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_SET_DEBOUNCE,
+				&request, sizeof(request), NULL, 0);
+	if (!ret)
+		ggc->lines[which].debounce_usec = debounce_usec;
+	return ret;
+}
+
+static void _gb_gpio_irq_mask(struct gb_gpio_controller *ggc, u8 hwirq)
+{
+	struct device *dev = &ggc->gbphy_dev->dev;
+	struct gb_gpio_irq_mask_request request;
+	int ret;
+
+	request.which = hwirq;
+	ret = gb_operation_sync(ggc->connection,
+				GB_GPIO_TYPE_IRQ_MASK,
+				&request, sizeof(request), NULL, 0);
+	if (ret)
+		dev_err(dev, "failed to mask irq: %d\n", ret);
+}
+
+static void _gb_gpio_irq_unmask(struct gb_gpio_controller *ggc, u8 hwirq)
+{
+	struct device *dev = &ggc->gbphy_dev->dev;
+	struct gb_gpio_irq_unmask_request request;
+	int ret;
+
+	request.which = hwirq;
+	ret = gb_operation_sync(ggc->connection,
+				GB_GPIO_TYPE_IRQ_UNMASK,
+				&request, sizeof(request), NULL, 0);
+	if (ret)
+		dev_err(dev, "failed to unmask irq: %d\n", ret);
+}
+
+static void _gb_gpio_irq_set_type(struct gb_gpio_controller *ggc,
+				  u8 hwirq, u8 type)
+{
+	struct device *dev = &ggc->gbphy_dev->dev;
+	struct gb_gpio_irq_type_request request;
+	int ret;
+
+	request.which = hwirq;
+	request.type = type;
+
+	ret = gb_operation_sync(ggc->connection,
+				GB_GPIO_TYPE_IRQ_TYPE,
+				&request, sizeof(request), NULL, 0);
+	if (ret)
+		dev_err(dev, "failed to set irq type: %d\n", ret);
+}
+
+static void gb_gpio_irq_mask(struct irq_data *d)
+{
+	struct gpio_chip *chip = irq_data_to_gpio_chip(d);
+	struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip);
+	struct gb_gpio_line *line = &ggc->lines[d->hwirq];
+
+	line->masked = true;
+	line->masked_pending = true;
+}
+
+static void gb_gpio_irq_unmask(struct irq_data *d)
+{
+	struct gpio_chip *chip = irq_data_to_gpio_chip(d);
+	struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip);
+	struct gb_gpio_line *line = &ggc->lines[d->hwirq];
+
+	line->masked = false;
+	line->masked_pending = true;
+}
+
+static int gb_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct gpio_chip *chip = irq_data_to_gpio_chip(d);
+	struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip);
+	struct gb_gpio_line *line = &ggc->lines[d->hwirq];
+	struct device *dev = &ggc->gbphy_dev->dev;
+	u8 irq_type;
+
+	switch (type) {
+	case IRQ_TYPE_NONE:
+		irq_type = GB_GPIO_IRQ_TYPE_NONE;
+		break;
+	case IRQ_TYPE_EDGE_RISING:
+		irq_type = GB_GPIO_IRQ_TYPE_EDGE_RISING;
+		break;
+	case IRQ_TYPE_EDGE_FALLING:
+		irq_type = GB_GPIO_IRQ_TYPE_EDGE_FALLING;
+		break;
+	case IRQ_TYPE_EDGE_BOTH:
+		irq_type = GB_GPIO_IRQ_TYPE_EDGE_BOTH;
+		break;
+	case IRQ_TYPE_LEVEL_LOW:
+		irq_type = GB_GPIO_IRQ_TYPE_LEVEL_LOW;
+		break;
+	case IRQ_TYPE_LEVEL_HIGH:
+		irq_type = GB_GPIO_IRQ_TYPE_LEVEL_HIGH;
+		break;
+	default:
+		dev_err(dev, "unsupported irq type: %u\n", type);
+		return -EINVAL;
+	}
+
+	line->irq_type = irq_type;
+	line->irq_type_pending = true;
+
+	return 0;
+}
+
+static void gb_gpio_irq_bus_lock(struct irq_data *d)
+{
+	struct gpio_chip *chip = irq_data_to_gpio_chip(d);
+	struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip);
+
+	mutex_lock(&ggc->irq_lock);
+}
+
+static void gb_gpio_irq_bus_sync_unlock(struct irq_data *d)
+{
+	struct gpio_chip *chip = irq_data_to_gpio_chip(d);
+	struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip);
+	struct gb_gpio_line *line = &ggc->lines[d->hwirq];
+
+	if (line->irq_type_pending) {
+		_gb_gpio_irq_set_type(ggc, d->hwirq, line->irq_type);
+		line->irq_type_pending = false;
+	}
+
+	if (line->masked_pending) {
+		if (line->masked)
+			_gb_gpio_irq_mask(ggc, d->hwirq);
+		else
+			_gb_gpio_irq_unmask(ggc, d->hwirq);
+		line->masked_pending = false;
+	}
+
+	mutex_unlock(&ggc->irq_lock);
+}
+
+static int gb_gpio_request_handler(struct gb_operation *op)
+{
+	struct gb_connection *connection = op->connection;
+	struct gb_gpio_controller *ggc = gb_connection_get_data(connection);
+	struct device *dev = &ggc->gbphy_dev->dev;
+	struct gb_message *request;
+	struct gb_gpio_irq_event_request *event;
+	u8 type = op->type;
+	int irq, ret;
+
+	if (type != GB_GPIO_TYPE_IRQ_EVENT) {
+		dev_err(dev, "unsupported unsolicited request: %u\n", type);
+		return -EINVAL;
+	}
+
+	request = op->request;
+
+	if (request->payload_size < sizeof(*event)) {
+		dev_err(dev, "short event received (%zu < %zu)\n",
+			request->payload_size, sizeof(*event));
+		return -EINVAL;
+	}
+
+	event = request->payload;
+	if (event->which > ggc->line_max) {
+		dev_err(dev, "invalid hw irq: %d\n", event->which);
+		return -EINVAL;
+	}
+
+	irq = irq_find_mapping(ggc->chip.irq.domain, event->which);
+	if (!irq) {
+		dev_err(dev, "failed to find IRQ\n");
+		return -EINVAL;
+	}
+
+	ret = generic_handle_irq_safe(irq);
+	if (ret)
+		dev_err(dev, "failed to invoke irq handler\n");
+
+	return ret;
+}
+
+static int gb_gpio_request(struct gpio_chip *chip, unsigned int offset)
+{
+	struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip);
+
+	return gb_gpio_activate_operation(ggc, (u8)offset);
+}
+
+static void gb_gpio_free(struct gpio_chip *chip, unsigned int offset)
+{
+	struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip);
+
+	gb_gpio_deactivate_operation(ggc, (u8)offset);
+}
+
+static int gb_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
+{
+	struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip);
+	u8 which;
+	int ret;
+
+	which = (u8)offset;
+	ret = gb_gpio_get_direction_operation(ggc, which);
+	if (ret)
+		return ret;
+
+	return ggc->lines[which].direction ? 1 : 0;
+}
+
+static int gb_gpio_direction_input(struct gpio_chip *chip, unsigned int offset)
+{
+	struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip);
+
+	return gb_gpio_direction_in_operation(ggc, (u8)offset);
+}
+
+static int gb_gpio_direction_output(struct gpio_chip *chip, unsigned int offset,
+				    int value)
+{
+	struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip);
+
+	return gb_gpio_direction_out_operation(ggc, (u8)offset, !!value);
+}
+
+static int gb_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+	struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip);
+	u8 which;
+	int ret;
+
+	which = (u8)offset;
+	ret = gb_gpio_get_value_operation(ggc, which);
+	if (ret)
+		return ret;
+
+	return ggc->lines[which].value;
+}
+
+static void gb_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
+{
+	struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip);
+
+	gb_gpio_set_value_operation(ggc, (u8)offset, !!value);
+}
+
+static int gb_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
+			      unsigned long config)
+{
+	struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip);
+	u32 debounce;
+
+	if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
+		return -ENOTSUPP;
+
+	debounce = pinconf_to_config_argument(config);
+	if (debounce > U16_MAX)
+		return -EINVAL;
+
+	return gb_gpio_set_debounce_operation(ggc, (u8)offset, (u16)debounce);
+}
+
+static int gb_gpio_controller_setup(struct gb_gpio_controller *ggc)
+{
+	int ret;
+
+	/* Now find out how many lines there are */
+	ret = gb_gpio_line_count_operation(ggc);
+	if (ret)
+		return ret;
+
+	ggc->lines = kcalloc(ggc->line_max + 1, sizeof(*ggc->lines),
+			     GFP_KERNEL);
+	if (!ggc->lines)
+		return -ENOMEM;
+
+	return ret;
+}
+
+static int gb_gpio_probe(struct gbphy_device *gbphy_dev,
+			 const struct gbphy_device_id *id)
+{
+	struct gb_connection *connection;
+	struct gb_gpio_controller *ggc;
+	struct gpio_chip *gpio;
+	struct gpio_irq_chip *girq;
+	struct irq_chip *irqc;
+	int ret;
+
+	ggc = kzalloc(sizeof(*ggc), GFP_KERNEL);
+	if (!ggc)
+		return -ENOMEM;
+
+	connection =
+		gb_connection_create(gbphy_dev->bundle,
+				     le16_to_cpu(gbphy_dev->cport_desc->id),
+				     gb_gpio_request_handler);
+	if (IS_ERR(connection)) {
+		ret = PTR_ERR(connection);
+		goto exit_ggc_free;
+	}
+
+	ggc->connection = connection;
+	gb_connection_set_data(connection, ggc);
+	ggc->gbphy_dev = gbphy_dev;
+	gb_gbphy_set_data(gbphy_dev, ggc);
+
+	ret = gb_connection_enable_tx(connection);
+	if (ret)
+		goto exit_connection_destroy;
+
+	ret = gb_gpio_controller_setup(ggc);
+	if (ret)
+		goto exit_connection_disable;
+
+	irqc = &ggc->irqc;
+	irqc->irq_mask = gb_gpio_irq_mask;
+	irqc->irq_unmask = gb_gpio_irq_unmask;
+	irqc->irq_set_type = gb_gpio_irq_set_type;
+	irqc->irq_bus_lock = gb_gpio_irq_bus_lock;
+	irqc->irq_bus_sync_unlock = gb_gpio_irq_bus_sync_unlock;
+	irqc->name = "greybus_gpio";
+
+	mutex_init(&ggc->irq_lock);
+
+	gpio = &ggc->chip;
+
+	gpio->label = "greybus_gpio";
+	gpio->parent = &gbphy_dev->dev;
+	gpio->owner = THIS_MODULE;
+
+	gpio->request = gb_gpio_request;
+	gpio->free = gb_gpio_free;
+	gpio->get_direction = gb_gpio_get_direction;
+	gpio->direction_input = gb_gpio_direction_input;
+	gpio->direction_output = gb_gpio_direction_output;
+	gpio->get = gb_gpio_get;
+	gpio->set = gb_gpio_set;
+	gpio->set_config = gb_gpio_set_config;
+	gpio->base = -1;		/* Allocate base dynamically */
+	gpio->ngpio = ggc->line_max + 1;
+	gpio->can_sleep = true;
+
+	girq = &gpio->irq;
+	girq->chip = irqc;
+	/* The event comes from the outside so no parent handler */
+	girq->parent_handler = NULL;
+	girq->num_parents = 0;
+	girq->parents = NULL;
+	girq->default_type = IRQ_TYPE_NONE;
+	girq->handler = handle_level_irq;
+
+	ret = gb_connection_enable(connection);
+	if (ret)
+		goto exit_line_free;
+
+	ret = gpiochip_add(gpio);
+	if (ret) {
+		dev_err(&gbphy_dev->dev, "failed to add gpio chip: %d\n", ret);
+		goto exit_line_free;
+	}
+
+	gbphy_runtime_put_autosuspend(gbphy_dev);
+	return 0;
+
+exit_line_free:
+	kfree(ggc->lines);
+exit_connection_disable:
+	gb_connection_disable(connection);
+exit_connection_destroy:
+	gb_connection_destroy(connection);
+exit_ggc_free:
+	kfree(ggc);
+	return ret;
+}
+
+static void gb_gpio_remove(struct gbphy_device *gbphy_dev)
+{
+	struct gb_gpio_controller *ggc = gb_gbphy_get_data(gbphy_dev);
+	struct gb_connection *connection = ggc->connection;
+	int ret;
+
+	ret = gbphy_runtime_get_sync(gbphy_dev);
+	if (ret)
+		gbphy_runtime_get_noresume(gbphy_dev);
+
+	gb_connection_disable_rx(connection);
+	gpiochip_remove(&ggc->chip);
+	gb_connection_disable(connection);
+	gb_connection_destroy(connection);
+	kfree(ggc->lines);
+	kfree(ggc);
+}
+
+static const struct gbphy_device_id gb_gpio_id_table[] = {
+	{ GBPHY_PROTOCOL(GREYBUS_PROTOCOL_GPIO) },
+	{ },
+};
+MODULE_DEVICE_TABLE(gbphy, gb_gpio_id_table);
+
+static struct gbphy_driver gpio_driver = {
+	.name		= "gpio",
+	.probe		= gb_gpio_probe,
+	.remove		= gb_gpio_remove,
+	.id_table	= gb_gpio_id_table,
+};
+
+module_gbphy_driver(gpio_driver);
+MODULE_LICENSE("GPL v2");