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, 506 insertions, 0 deletions

diff --git a/drivers/net/phy/spi_ks8995.c b/drivers/net/phy/spi_ks8995.c
new file mode 100644
index 000000000..d4202d40d
--- /dev/null
+++ b/drivers/net/phy/spi_ks8995.c
@@ -0,0 +1,506 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * SPI driver for Micrel/Kendin KS8995M and KSZ8864RMN ethernet switches
+ *
+ * Copyright (C) 2008 Gabor Juhos <juhosg at openwrt.org>
+ *
+ * This file was based on: drivers/spi/at25.c
+ *     Copyright (C) 2006 David Brownell
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/of.h>
+
+#include <linux/spi/spi.h>
+
+#define DRV_VERSION		"0.1.1"
+#define DRV_DESC		"Micrel KS8995 Ethernet switch SPI driver"
+
+/* ------------------------------------------------------------------------ */
+
+#define KS8995_REG_ID0		0x00    /* Chip ID0 */
+#define KS8995_REG_ID1		0x01    /* Chip ID1 */
+
+#define KS8995_REG_GC0		0x02    /* Global Control 0 */
+#define KS8995_REG_GC1		0x03    /* Global Control 1 */
+#define KS8995_REG_GC2		0x04    /* Global Control 2 */
+#define KS8995_REG_GC3		0x05    /* Global Control 3 */
+#define KS8995_REG_GC4		0x06    /* Global Control 4 */
+#define KS8995_REG_GC5		0x07    /* Global Control 5 */
+#define KS8995_REG_GC6		0x08    /* Global Control 6 */
+#define KS8995_REG_GC7		0x09    /* Global Control 7 */
+#define KS8995_REG_GC8		0x0a    /* Global Control 8 */
+#define KS8995_REG_GC9		0x0b    /* Global Control 9 */
+
+#define KS8995_REG_PC(p, r)	((0x10 * p) + r)	 /* Port Control */
+#define KS8995_REG_PS(p, r)	((0x10 * p) + r + 0xe)  /* Port Status */
+
+#define KS8995_REG_TPC0		0x60    /* TOS Priority Control 0 */
+#define KS8995_REG_TPC1		0x61    /* TOS Priority Control 1 */
+#define KS8995_REG_TPC2		0x62    /* TOS Priority Control 2 */
+#define KS8995_REG_TPC3		0x63    /* TOS Priority Control 3 */
+#define KS8995_REG_TPC4		0x64    /* TOS Priority Control 4 */
+#define KS8995_REG_TPC5		0x65    /* TOS Priority Control 5 */
+#define KS8995_REG_TPC6		0x66    /* TOS Priority Control 6 */
+#define KS8995_REG_TPC7		0x67    /* TOS Priority Control 7 */
+
+#define KS8995_REG_MAC0		0x68    /* MAC address 0 */
+#define KS8995_REG_MAC1		0x69    /* MAC address 1 */
+#define KS8995_REG_MAC2		0x6a    /* MAC address 2 */
+#define KS8995_REG_MAC3		0x6b    /* MAC address 3 */
+#define KS8995_REG_MAC4		0x6c    /* MAC address 4 */
+#define KS8995_REG_MAC5		0x6d    /* MAC address 5 */
+
+#define KS8995_REG_IAC0		0x6e    /* Indirect Access Control 0 */
+#define KS8995_REG_IAC1		0x6f    /* Indirect Access Control 0 */
+#define KS8995_REG_IAD7		0x70    /* Indirect Access Data 7 */
+#define KS8995_REG_IAD6		0x71    /* Indirect Access Data 6 */
+#define KS8995_REG_IAD5		0x72    /* Indirect Access Data 5 */
+#define KS8995_REG_IAD4		0x73    /* Indirect Access Data 4 */
+#define KS8995_REG_IAD3		0x74    /* Indirect Access Data 3 */
+#define KS8995_REG_IAD2		0x75    /* Indirect Access Data 2 */
+#define KS8995_REG_IAD1		0x76    /* Indirect Access Data 1 */
+#define KS8995_REG_IAD0		0x77    /* Indirect Access Data 0 */
+
+#define KSZ8864_REG_ID1		0xfe	/* Chip ID in bit 7 */
+
+#define KS8995_REGS_SIZE	0x80
+#define KSZ8864_REGS_SIZE	0x100
+#define KSZ8795_REGS_SIZE	0x100
+
+#define ID1_CHIPID_M		0xf
+#define ID1_CHIPID_S		4
+#define ID1_REVISION_M		0x7
+#define ID1_REVISION_S		1
+#define ID1_START_SW		1	/* start the switch */
+
+#define FAMILY_KS8995		0x95
+#define FAMILY_KSZ8795		0x87
+#define CHIPID_M		0
+#define KS8995_CHIP_ID		0x00
+#define KSZ8864_CHIP_ID		0x01
+#define KSZ8795_CHIP_ID		0x09
+
+#define KS8995_CMD_WRITE	0x02U
+#define KS8995_CMD_READ		0x03U
+
+#define KS8995_RESET_DELAY	10 /* usec */
+
+enum ks8995_chip_variant {
+	ks8995,
+	ksz8864,
+	ksz8795,
+	max_variant
+};
+
+struct ks8995_chip_params {
+	char *name;
+	int family_id;
+	int chip_id;
+	int regs_size;
+	int addr_width;
+	int addr_shift;
+};
+
+static const struct ks8995_chip_params ks8995_chip[] = {
+	[ks8995] = {
+		.name = "KS8995MA",
+		.family_id = FAMILY_KS8995,
+		.chip_id = KS8995_CHIP_ID,
+		.regs_size = KS8995_REGS_SIZE,
+		.addr_width = 8,
+		.addr_shift = 0,
+	},
+	[ksz8864] = {
+		.name = "KSZ8864RMN",
+		.family_id = FAMILY_KS8995,
+		.chip_id = KSZ8864_CHIP_ID,
+		.regs_size = KSZ8864_REGS_SIZE,
+		.addr_width = 8,
+		.addr_shift = 0,
+	},
+	[ksz8795] = {
+		.name = "KSZ8795CLX",
+		.family_id = FAMILY_KSZ8795,
+		.chip_id = KSZ8795_CHIP_ID,
+		.regs_size = KSZ8795_REGS_SIZE,
+		.addr_width = 12,
+		.addr_shift = 1,
+	},
+};
+
+struct ks8995_switch {
+	struct spi_device	*spi;
+	struct mutex		lock;
+	struct gpio_desc	*reset_gpio;
+	struct bin_attribute	regs_attr;
+	const struct ks8995_chip_params	*chip;
+	int			revision_id;
+};
+
+static const struct spi_device_id ks8995_id[] = {
+	{"ks8995", ks8995},
+	{"ksz8864", ksz8864},
+	{"ksz8795", ksz8795},
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, ks8995_id);
+
+static const struct of_device_id ks8895_spi_of_match[] = {
+	{ .compatible = "micrel,ks8995" },
+	{ .compatible = "micrel,ksz8864" },
+	{ .compatible = "micrel,ksz8795" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, ks8895_spi_of_match);
+
+static inline u8 get_chip_id(u8 val)
+{
+	return (val >> ID1_CHIPID_S) & ID1_CHIPID_M;
+}
+
+static inline u8 get_chip_rev(u8 val)
+{
+	return (val >> ID1_REVISION_S) & ID1_REVISION_M;
+}
+
+/* create_spi_cmd - create a chip specific SPI command header
+ * @ks: pointer to switch instance
+ * @cmd: SPI command for switch
+ * @address: register address for command
+ *
+ * Different chip families use different bit pattern to address the switches
+ * registers:
+ *
+ * KS8995: 8bit command + 8bit address
+ * KSZ8795: 3bit command + 12bit address + 1bit TR (?)
+ */
+static inline __be16 create_spi_cmd(struct ks8995_switch *ks, int cmd,
+				    unsigned address)
+{
+	u16 result = cmd;
+
+	/* make room for address (incl. address shift) */
+	result <<= ks->chip->addr_width + ks->chip->addr_shift;
+	/* add address */
+	result |= address << ks->chip->addr_shift;
+	/* SPI protocol needs big endian */
+	return cpu_to_be16(result);
+}
+/* ------------------------------------------------------------------------ */
+static int ks8995_read(struct ks8995_switch *ks, char *buf,
+		 unsigned offset, size_t count)
+{
+	__be16 cmd;
+	struct spi_transfer t[2];
+	struct spi_message m;
+	int err;
+
+	cmd = create_spi_cmd(ks, KS8995_CMD_READ, offset);
+	spi_message_init(&m);
+
+	memset(&t, 0, sizeof(t));
+
+	t[0].tx_buf = &cmd;
+	t[0].len = sizeof(cmd);
+	spi_message_add_tail(&t[0], &m);
+
+	t[1].rx_buf = buf;
+	t[1].len = count;
+	spi_message_add_tail(&t[1], &m);
+
+	mutex_lock(&ks->lock);
+	err = spi_sync(ks->spi, &m);
+	mutex_unlock(&ks->lock);
+
+	return err ? err : count;
+}
+
+static int ks8995_write(struct ks8995_switch *ks, char *buf,
+		 unsigned offset, size_t count)
+{
+	__be16 cmd;
+	struct spi_transfer t[2];
+	struct spi_message m;
+	int err;
+
+	cmd = create_spi_cmd(ks, KS8995_CMD_WRITE, offset);
+	spi_message_init(&m);
+
+	memset(&t, 0, sizeof(t));
+
+	t[0].tx_buf = &cmd;
+	t[0].len = sizeof(cmd);
+	spi_message_add_tail(&t[0], &m);
+
+	t[1].tx_buf = buf;
+	t[1].len = count;
+	spi_message_add_tail(&t[1], &m);
+
+	mutex_lock(&ks->lock);
+	err = spi_sync(ks->spi, &m);
+	mutex_unlock(&ks->lock);
+
+	return err ? err : count;
+}
+
+static inline int ks8995_read_reg(struct ks8995_switch *ks, u8 addr, u8 *buf)
+{
+	return ks8995_read(ks, buf, addr, 1) != 1;
+}
+
+static inline int ks8995_write_reg(struct ks8995_switch *ks, u8 addr, u8 val)
+{
+	char buf = val;
+
+	return ks8995_write(ks, &buf, addr, 1) != 1;
+}
+
+/* ------------------------------------------------------------------------ */
+
+static int ks8995_stop(struct ks8995_switch *ks)
+{
+	return ks8995_write_reg(ks, KS8995_REG_ID1, 0);
+}
+
+static int ks8995_start(struct ks8995_switch *ks)
+{
+	return ks8995_write_reg(ks, KS8995_REG_ID1, 1);
+}
+
+static int ks8995_reset(struct ks8995_switch *ks)
+{
+	int err;
+
+	err = ks8995_stop(ks);
+	if (err)
+		return err;
+
+	udelay(KS8995_RESET_DELAY);
+
+	return ks8995_start(ks);
+}
+
+static ssize_t ks8995_registers_read(struct file *filp, struct kobject *kobj,
+	struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count)
+{
+	struct device *dev;
+	struct ks8995_switch *ks8995;
+
+	dev = kobj_to_dev(kobj);
+	ks8995 = dev_get_drvdata(dev);
+
+	return ks8995_read(ks8995, buf, off, count);
+}
+
+static ssize_t ks8995_registers_write(struct file *filp, struct kobject *kobj,
+	struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count)
+{
+	struct device *dev;
+	struct ks8995_switch *ks8995;
+
+	dev = kobj_to_dev(kobj);
+	ks8995 = dev_get_drvdata(dev);
+
+	return ks8995_write(ks8995, buf, off, count);
+}
+
+/* ks8995_get_revision - get chip revision
+ * @ks: pointer to switch instance
+ *
+ * Verify chip family and id and get chip revision.
+ */
+static int ks8995_get_revision(struct ks8995_switch *ks)
+{
+	int err;
+	u8 id0, id1, ksz8864_id;
+
+	/* read family id */
+	err = ks8995_read_reg(ks, KS8995_REG_ID0, &id0);
+	if (err) {
+		err = -EIO;
+		goto err_out;
+	}
+
+	/* verify family id */
+	if (id0 != ks->chip->family_id) {
+		dev_err(&ks->spi->dev, "chip family id mismatch: expected 0x%02x but 0x%02x read\n",
+			ks->chip->family_id, id0);
+		err = -ENODEV;
+		goto err_out;
+	}
+
+	switch (ks->chip->family_id) {
+	case FAMILY_KS8995:
+		/* try reading chip id at CHIP ID1 */
+		err = ks8995_read_reg(ks, KS8995_REG_ID1, &id1);
+		if (err) {
+			err = -EIO;
+			goto err_out;
+		}
+
+		/* verify chip id */
+		if ((get_chip_id(id1) == CHIPID_M) &&
+		    (get_chip_id(id1) == ks->chip->chip_id)) {
+			/* KS8995MA */
+			ks->revision_id = get_chip_rev(id1);
+		} else if (get_chip_id(id1) != CHIPID_M) {
+			/* KSZ8864RMN */
+			err = ks8995_read_reg(ks, KS8995_REG_ID1, &ksz8864_id);
+			if (err) {
+				err = -EIO;
+				goto err_out;
+			}
+
+			if ((ksz8864_id & 0x80) &&
+			    (ks->chip->chip_id == KSZ8864_CHIP_ID)) {
+				ks->revision_id = get_chip_rev(id1);
+			}
+
+		} else {
+			dev_err(&ks->spi->dev, "unsupported chip id for KS8995 family: 0x%02x\n",
+				id1);
+			err = -ENODEV;
+		}
+		break;
+	case FAMILY_KSZ8795:
+		/* try reading chip id at CHIP ID1 */
+		err = ks8995_read_reg(ks, KS8995_REG_ID1, &id1);
+		if (err) {
+			err = -EIO;
+			goto err_out;
+		}
+
+		if (get_chip_id(id1) == ks->chip->chip_id) {
+			ks->revision_id = get_chip_rev(id1);
+		} else {
+			dev_err(&ks->spi->dev, "unsupported chip id for KSZ8795 family: 0x%02x\n",
+				id1);
+			err = -ENODEV;
+		}
+		break;
+	default:
+		dev_err(&ks->spi->dev, "unsupported family id: 0x%02x\n", id0);
+		err = -ENODEV;
+		break;
+	}
+err_out:
+	return err;
+}
+
+static const struct bin_attribute ks8995_registers_attr = {
+	.attr = {
+		.name   = "registers",
+		.mode   = 0600,
+	},
+	.size   = KS8995_REGS_SIZE,
+	.read   = ks8995_registers_read,
+	.write  = ks8995_registers_write,
+};
+
+/* ------------------------------------------------------------------------ */
+static int ks8995_probe(struct spi_device *spi)
+{
+	struct ks8995_switch *ks;
+	int err;
+	int variant = spi_get_device_id(spi)->driver_data;
+
+	if (variant >= max_variant) {
+		dev_err(&spi->dev, "bad chip variant %d\n", variant);
+		return -ENODEV;
+	}
+
+	ks = devm_kzalloc(&spi->dev, sizeof(*ks), GFP_KERNEL);
+	if (!ks)
+		return -ENOMEM;
+
+	mutex_init(&ks->lock);
+	ks->spi = spi;
+	ks->chip = &ks8995_chip[variant];
+
+	ks->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset",
+						 GPIOD_OUT_HIGH);
+	err = PTR_ERR_OR_ZERO(ks->reset_gpio);
+	if (err) {
+		dev_err(&spi->dev,
+			"failed to get reset gpio: %d\n", err);
+		return err;
+	}
+
+	err = gpiod_set_consumer_name(ks->reset_gpio, "switch-reset");
+	if (err)
+		return err;
+
+	/* de-assert switch reset */
+	/* FIXME: this likely requires a delay */
+	gpiod_set_value_cansleep(ks->reset_gpio, 0);
+
+	spi_set_drvdata(spi, ks);
+
+	spi->mode = SPI_MODE_0;
+	spi->bits_per_word = 8;
+	err = spi_setup(spi);
+	if (err) {
+		dev_err(&spi->dev, "spi_setup failed, err=%d\n", err);
+		return err;
+	}
+
+	err = ks8995_get_revision(ks);
+	if (err)
+		return err;
+
+	memcpy(&ks->regs_attr, &ks8995_registers_attr, sizeof(ks->regs_attr));
+	ks->regs_attr.size = ks->chip->regs_size;
+
+	err = ks8995_reset(ks);
+	if (err)
+		return err;
+
+	sysfs_attr_init(&ks->regs_attr.attr);
+	err = sysfs_create_bin_file(&spi->dev.kobj, &ks->regs_attr);
+	if (err) {
+		dev_err(&spi->dev, "unable to create sysfs file, err=%d\n",
+				    err);
+		return err;
+	}
+
+	dev_info(&spi->dev, "%s device found, Chip ID:%x, Revision:%x\n",
+		 ks->chip->name, ks->chip->chip_id, ks->revision_id);
+
+	return 0;
+}
+
+static void ks8995_remove(struct spi_device *spi)
+{
+	struct ks8995_switch *ks = spi_get_drvdata(spi);
+
+	sysfs_remove_bin_file(&spi->dev.kobj, &ks->regs_attr);
+
+	/* assert reset */
+	gpiod_set_value_cansleep(ks->reset_gpio, 1);
+}
+
+/* ------------------------------------------------------------------------ */
+static struct spi_driver ks8995_driver = {
+	.driver = {
+		.name	    = "spi-ks8995",
+		.of_match_table = of_match_ptr(ks8895_spi_of_match),
+	},
+	.probe	  = ks8995_probe,
+	.remove	  = ks8995_remove,
+	.id_table = ks8995_id,
+};
+
+module_spi_driver(ks8995_driver);
+
+MODULE_DESCRIPTION(DRV_DESC);
+MODULE_VERSION(DRV_VERSION);
+MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
+MODULE_LICENSE("GPL v2");