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, 566 insertions, 0 deletions

diff --git a/drivers/misc/gehc-achc.c b/drivers/misc/gehc-achc.c
new file mode 100644
index 000000000..4c9c5394d
--- /dev/null
+++ b/drivers/misc/gehc-achc.c
@@ -0,0 +1,566 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * datasheet: https://www.nxp.com/docs/en/data-sheet/K20P144M120SF3.pdf
+ *
+ * Copyright (C) 2018-2021 Collabora
+ * Copyright (C) 2018-2021 GE Healthcare
+ */
+
+#include <linux/delay.h>
+#include <linux/firmware.h>
+#include <linux/gpio/consumer.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/spi/spi.h>
+
+#define ACHC_MAX_FREQ_HZ 300000
+#define ACHC_FAST_READ_FREQ_HZ 1000000
+
+struct achc_data {
+	struct spi_device *main;
+	struct spi_device *ezport;
+	struct gpio_desc *reset;
+
+	struct mutex device_lock; /* avoid concurrent device access */
+};
+
+#define EZPORT_RESET_DELAY_MS	100
+#define EZPORT_STARTUP_DELAY_MS	200
+#define EZPORT_WRITE_WAIT_MS	10
+#define EZPORT_TRANSFER_SIZE	2048
+
+#define EZPORT_CMD_SP		0x02 /* flash section program */
+#define EZPORT_CMD_RDSR		0x05 /* read status register */
+#define EZPORT_CMD_WREN		0x06 /* write enable */
+#define EZPORT_CMD_FAST_READ	0x0b /* flash read data at high speed */
+#define EZPORT_CMD_RESET	0xb9 /* reset chip */
+#define EZPORT_CMD_BE		0xc7 /* bulk erase */
+#define EZPORT_CMD_SE		0xd8 /* sector erase */
+
+#define EZPORT_SECTOR_SIZE	4096
+#define EZPORT_SECTOR_MASK	(EZPORT_SECTOR_SIZE - 1)
+
+#define EZPORT_STATUS_WIP	BIT(0) /* write in progress */
+#define EZPORT_STATUS_WEN	BIT(1) /* write enable */
+#define EZPORT_STATUS_BEDIS	BIT(2) /* bulk erase disable */
+#define EZPORT_STATUS_FLEXRAM	BIT(3) /* FlexRAM mode */
+#define EZPORT_STATUS_WEF	BIT(6) /* write error flag */
+#define EZPORT_STATUS_FS	BIT(7) /* flash security */
+
+static void ezport_reset(struct gpio_desc *reset)
+{
+	gpiod_set_value(reset, 1);
+	msleep(EZPORT_RESET_DELAY_MS);
+	gpiod_set_value(reset, 0);
+	msleep(EZPORT_STARTUP_DELAY_MS);
+}
+
+static int ezport_start_programming(struct spi_device *spi, struct gpio_desc *reset)
+{
+	struct spi_message msg;
+	struct spi_transfer assert_cs = {
+		.cs_change   = 1,
+	};
+	struct spi_transfer release_cs = { };
+	int ret;
+
+	spi_bus_lock(spi->master);
+
+	/* assert chip select */
+	spi_message_init(&msg);
+	spi_message_add_tail(&assert_cs, &msg);
+	ret = spi_sync_locked(spi, &msg);
+	if (ret)
+		goto fail;
+
+	msleep(EZPORT_STARTUP_DELAY_MS);
+
+	/* reset with asserted chip select to switch into programming mode */
+	ezport_reset(reset);
+
+	/* release chip select */
+	spi_message_init(&msg);
+	spi_message_add_tail(&release_cs, &msg);
+	ret = spi_sync_locked(spi, &msg);
+
+fail:
+	spi_bus_unlock(spi->master);
+	return ret;
+}
+
+static void ezport_stop_programming(struct spi_device *spi, struct gpio_desc *reset)
+{
+	/* reset without asserted chip select to return into normal mode */
+	spi_bus_lock(spi->master);
+	ezport_reset(reset);
+	spi_bus_unlock(spi->master);
+}
+
+static int ezport_get_status_register(struct spi_device *spi)
+{
+	int ret;
+
+	ret = spi_w8r8(spi, EZPORT_CMD_RDSR);
+	if (ret < 0)
+		return ret;
+	if (ret == 0xff) {
+		dev_err(&spi->dev, "Invalid EzPort status, EzPort is not functional!\n");
+		return -EINVAL;
+	}
+
+	return ret;
+}
+
+static int ezport_soft_reset(struct spi_device *spi)
+{
+	u8 cmd = EZPORT_CMD_RESET;
+	int ret;
+
+	ret = spi_write(spi, &cmd, 1);
+	if (ret < 0)
+		return ret;
+
+	msleep(EZPORT_STARTUP_DELAY_MS);
+
+	return 0;
+}
+
+static int ezport_send_simple(struct spi_device *spi, u8 cmd)
+{
+	int ret;
+
+	ret = spi_write(spi, &cmd, 1);
+	if (ret < 0)
+		return ret;
+
+	return ezport_get_status_register(spi);
+}
+
+static int ezport_wait_write(struct spi_device *spi, u32 retries)
+{
+	int ret;
+	u32 i;
+
+	for (i = 0; i < retries; i++) {
+		ret = ezport_get_status_register(spi);
+		if (ret >= 0 && !(ret & EZPORT_STATUS_WIP))
+			break;
+		msleep(EZPORT_WRITE_WAIT_MS);
+	}
+
+	return ret;
+}
+
+static int ezport_write_enable(struct spi_device *spi)
+{
+	int ret = 0, retries = 3;
+
+	for (retries = 0; retries < 3; retries++) {
+		ret = ezport_send_simple(spi, EZPORT_CMD_WREN);
+		if (ret > 0 && ret & EZPORT_STATUS_WEN)
+			break;
+	}
+
+	if (!(ret & EZPORT_STATUS_WEN)) {
+		dev_err(&spi->dev, "EzPort write enable timed out\n");
+		return -ETIMEDOUT;
+	}
+	return 0;
+}
+
+static int ezport_bulk_erase(struct spi_device *spi)
+{
+	int ret;
+	static const u8 cmd = EZPORT_CMD_BE;
+
+	dev_dbg(&spi->dev, "EzPort bulk erase...\n");
+
+	ret = ezport_write_enable(spi);
+	if (ret < 0)
+		return ret;
+
+	ret = spi_write(spi, &cmd, 1);
+	if (ret < 0)
+		return ret;
+
+	ret = ezport_wait_write(spi, 1000);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int ezport_section_erase(struct spi_device *spi, u32 address)
+{
+	u8 query[] = {EZPORT_CMD_SE, (address >> 16) & 0xff, (address >> 8) & 0xff, address & 0xff};
+	int ret;
+
+	dev_dbg(&spi->dev, "Ezport section erase @ 0x%06x...\n", address);
+
+	if (address & EZPORT_SECTOR_MASK)
+		return -EINVAL;
+
+	ret = ezport_write_enable(spi);
+	if (ret < 0)
+		return ret;
+
+	ret = spi_write(spi, query, sizeof(query));
+	if (ret < 0)
+		return ret;
+
+	return ezport_wait_write(spi, 200);
+}
+
+static int ezport_flash_transfer(struct spi_device *spi, u32 address,
+				 const u8 *payload, size_t payload_size)
+{
+	struct spi_transfer xfers[2] = {};
+	u8 *command;
+	int ret;
+
+	dev_dbg(&spi->dev, "EzPort write %zu bytes @ 0x%06x...\n", payload_size, address);
+
+	ret = ezport_write_enable(spi);
+	if (ret < 0)
+		return ret;
+
+	command = kmalloc(4, GFP_KERNEL | GFP_DMA);
+	if (!command)
+		return -ENOMEM;
+
+	command[0] = EZPORT_CMD_SP;
+	command[1] = address >> 16;
+	command[2] = address >> 8;
+	command[3] = address >> 0;
+
+	xfers[0].tx_buf = command;
+	xfers[0].len = 4;
+
+	xfers[1].tx_buf = payload;
+	xfers[1].len = payload_size;
+
+	ret = spi_sync_transfer(spi, xfers, 2);
+	kfree(command);
+	if (ret < 0)
+		return ret;
+
+	return ezport_wait_write(spi, 40);
+}
+
+static int ezport_flash_compare(struct spi_device *spi, u32 address,
+				const u8 *payload, size_t payload_size)
+{
+	struct spi_transfer xfers[2] = {};
+	u8 *buffer;
+	int ret;
+
+	buffer = kmalloc(payload_size + 5, GFP_KERNEL | GFP_DMA);
+	if (!buffer)
+		return -ENOMEM;
+
+	buffer[0] = EZPORT_CMD_FAST_READ;
+	buffer[1] = address >> 16;
+	buffer[2] = address >> 8;
+	buffer[3] = address >> 0;
+
+	xfers[0].tx_buf = buffer;
+	xfers[0].len = 4;
+	xfers[0].speed_hz = ACHC_FAST_READ_FREQ_HZ;
+
+	xfers[1].rx_buf = buffer + 4;
+	xfers[1].len = payload_size + 1;
+	xfers[1].speed_hz = ACHC_FAST_READ_FREQ_HZ;
+
+	ret = spi_sync_transfer(spi, xfers, 2);
+	if (ret)
+		goto err;
+
+	/* FAST_READ receives one dummy byte before the real data */
+	ret = memcmp(payload, buffer + 4 + 1, payload_size);
+	if (ret) {
+		ret = -EBADMSG;
+		dev_dbg(&spi->dev, "Verification failure @ %06x", address);
+		print_hex_dump_bytes("fw:  ", DUMP_PREFIX_OFFSET, payload, payload_size);
+		print_hex_dump_bytes("dev: ", DUMP_PREFIX_OFFSET, buffer + 4, payload_size);
+	}
+
+err:
+	kfree(buffer);
+	return ret;
+}
+
+static int ezport_firmware_compare_data(struct spi_device *spi,
+					const u8 *data, size_t size)
+{
+	int ret;
+	size_t address = 0;
+	size_t transfer_size;
+
+	dev_dbg(&spi->dev, "EzPort compare data with %zu bytes...\n", size);
+
+	ret = ezport_get_status_register(spi);
+	if (ret < 0)
+		return ret;
+
+	if (ret & EZPORT_STATUS_FS) {
+		dev_info(&spi->dev, "Device is in secure mode (status=0x%02x)!\n", ret);
+		dev_info(&spi->dev, "FW verification is not possible\n");
+		return -EACCES;
+	}
+
+	while (size - address > 0) {
+		transfer_size = min((size_t) EZPORT_TRANSFER_SIZE, size - address);
+
+		ret = ezport_flash_compare(spi, address, data+address, transfer_size);
+		if (ret)
+			return ret;
+
+		address += transfer_size;
+	}
+
+	return 0;
+}
+
+static int ezport_firmware_flash_data(struct spi_device *spi,
+				      const u8 *data, size_t size)
+{
+	int ret;
+	size_t address = 0;
+	size_t transfer_size;
+
+	dev_dbg(&spi->dev, "EzPort flash data with %zu bytes...\n", size);
+
+	ret = ezport_get_status_register(spi);
+	if (ret < 0)
+		return ret;
+
+	if (ret & EZPORT_STATUS_FS) {
+		ret = ezport_bulk_erase(spi);
+		if (ret < 0)
+			return ret;
+		if (ret & EZPORT_STATUS_FS)
+			return -EINVAL;
+	}
+
+	while (size - address > 0) {
+		if (!(address & EZPORT_SECTOR_MASK)) {
+			ret = ezport_section_erase(spi, address);
+			if (ret < 0)
+				return ret;
+			if (ret & EZPORT_STATUS_WIP || ret & EZPORT_STATUS_WEF)
+				return -EIO;
+		}
+
+		transfer_size = min((size_t) EZPORT_TRANSFER_SIZE, size - address);
+
+		ret = ezport_flash_transfer(spi, address,
+					    data+address, transfer_size);
+		if (ret < 0)
+			return ret;
+		else if (ret & EZPORT_STATUS_WIP)
+			return -ETIMEDOUT;
+		else if (ret & EZPORT_STATUS_WEF)
+			return -EIO;
+
+		address += transfer_size;
+	}
+
+	dev_dbg(&spi->dev, "EzPort verify flashed data...\n");
+	ret = ezport_firmware_compare_data(spi, data, size);
+
+	/* allow missing FW verfication in secure mode */
+	if (ret == -EACCES)
+		ret = 0;
+
+	if (ret < 0)
+		dev_err(&spi->dev, "Failed to verify flashed data: %d\n", ret);
+
+	ret = ezport_soft_reset(spi);
+	if (ret < 0)
+		dev_warn(&spi->dev, "EzPort reset failed!\n");
+
+	return ret;
+}
+
+static int ezport_firmware_load(struct spi_device *spi, const char *fwname)
+{
+	const struct firmware *fw;
+	int ret;
+
+	ret = request_firmware(&fw, fwname, &spi->dev);
+	if (ret) {
+		dev_err(&spi->dev, "Could not get firmware: %d\n", ret);
+		return ret;
+	}
+
+	ret = ezport_firmware_flash_data(spi, fw->data, fw->size);
+
+	release_firmware(fw);
+
+	return ret;
+}
+
+/**
+ * ezport_flash - flash device firmware
+ * @spi: SPI device for NXP EzPort interface
+ * @reset: the gpio connected to the device reset pin
+ * @fwname: filename of the firmware that should be flashed
+ *
+ * Context: can sleep
+ *
+ * Return: 0 on success; negative errno on failure
+ */
+static int ezport_flash(struct spi_device *spi, struct gpio_desc *reset, const char *fwname)
+{
+	int ret;
+
+	ret = ezport_start_programming(spi, reset);
+	if (ret)
+		return ret;
+
+	ret = ezport_firmware_load(spi, fwname);
+
+	ezport_stop_programming(spi, reset);
+
+	if (ret)
+		dev_err(&spi->dev, "Failed to flash firmware: %d\n", ret);
+	else
+		dev_dbg(&spi->dev, "Finished FW flashing!\n");
+
+	return ret;
+}
+
+static ssize_t update_firmware_store(struct device *dev, struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	struct achc_data *achc = dev_get_drvdata(dev);
+	unsigned long value;
+	int ret;
+
+	ret = kstrtoul(buf, 0, &value);
+	if (ret < 0 || value != 1)
+		return -EINVAL;
+
+	mutex_lock(&achc->device_lock);
+	ret = ezport_flash(achc->ezport, achc->reset, "achc.bin");
+	mutex_unlock(&achc->device_lock);
+
+	if (ret < 0)
+		return ret;
+
+	return count;
+}
+static DEVICE_ATTR_WO(update_firmware);
+
+static ssize_t reset_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct achc_data *achc = dev_get_drvdata(dev);
+	int ret;
+
+	mutex_lock(&achc->device_lock);
+	ret = gpiod_get_value(achc->reset);
+	mutex_unlock(&achc->device_lock);
+
+	if (ret < 0)
+		return ret;
+
+	return sysfs_emit(buf, "%d\n", ret);
+}
+
+static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
+			   const char *buf, size_t count)
+{
+	struct achc_data *achc = dev_get_drvdata(dev);
+	unsigned long value;
+	int ret;
+
+	ret = kstrtoul(buf, 0, &value);
+	if (ret < 0 || value > 1)
+		return -EINVAL;
+
+	mutex_lock(&achc->device_lock);
+	gpiod_set_value(achc->reset, value);
+	mutex_unlock(&achc->device_lock);
+
+	return count;
+}
+static DEVICE_ATTR_RW(reset);
+
+static struct attribute *gehc_achc_attrs[] = {
+	&dev_attr_update_firmware.attr,
+	&dev_attr_reset.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(gehc_achc);
+
+static void unregister_ezport(void *data)
+{
+	struct spi_device *ezport = data;
+
+	spi_unregister_device(ezport);
+}
+
+static int gehc_achc_probe(struct spi_device *spi)
+{
+	struct achc_data *achc;
+	int ezport_reg, ret;
+
+	spi->max_speed_hz = ACHC_MAX_FREQ_HZ;
+	spi->bits_per_word = 8;
+	spi->mode = SPI_MODE_0;
+
+	achc = devm_kzalloc(&spi->dev, sizeof(*achc), GFP_KERNEL);
+	if (!achc)
+		return -ENOMEM;
+	spi_set_drvdata(spi, achc);
+	achc->main = spi;
+
+	mutex_init(&achc->device_lock);
+
+	ret = of_property_read_u32_index(spi->dev.of_node, "reg", 1, &ezport_reg);
+	if (ret)
+		return dev_err_probe(&spi->dev, ret, "missing second reg entry!\n");
+
+	achc->ezport = spi_new_ancillary_device(spi, ezport_reg);
+	if (IS_ERR(achc->ezport))
+		return PTR_ERR(achc->ezport);
+
+	ret = devm_add_action_or_reset(&spi->dev, unregister_ezport, achc->ezport);
+	if (ret)
+		return ret;
+
+	achc->reset = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(achc->reset))
+		return dev_err_probe(&spi->dev, PTR_ERR(achc->reset), "Could not get reset gpio\n");
+
+	return 0;
+}
+
+static const struct spi_device_id gehc_achc_id[] = {
+	{ "ge,achc", 0 },
+	{ "achc", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, gehc_achc_id);
+
+static const struct of_device_id gehc_achc_of_match[] = {
+	{ .compatible = "ge,achc" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, gehc_achc_of_match);
+
+static struct spi_driver gehc_achc_spi_driver = {
+	.driver = {
+		.name	= "gehc-achc",
+		.of_match_table = gehc_achc_of_match,
+		.dev_groups = gehc_achc_groups,
+	},
+	.probe		= gehc_achc_probe,
+	.id_table	= gehc_achc_id,
+};
+module_spi_driver(gehc_achc_spi_driver);
+
+MODULE_DESCRIPTION("GEHC ACHC driver");
+MODULE_AUTHOR("Sebastian Reichel <sebastian.reichel@collabora.com>");
+MODULE_LICENSE("GPL");