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, 570 insertions, 0 deletions

diff --git a/drivers/staging/greybus/spilib.c b/drivers/staging/greybus/spilib.c
new file mode 100644
index 000000000..ad0700a0b
--- /dev/null
+++ b/drivers/staging/greybus/spilib.c
@@ -0,0 +1,570 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Greybus SPI library
+ *
+ * Copyright 2014-2016 Google Inc.
+ * Copyright 2014-2016 Linaro Ltd.
+ */
+
+#include <linux/bitops.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/greybus.h>
+#include <linux/spi/spi.h>
+
+#include "spilib.h"
+
+struct gb_spilib {
+	struct gb_connection	*connection;
+	struct device		*parent;
+	struct spi_transfer	*first_xfer;
+	struct spi_transfer	*last_xfer;
+	struct spilib_ops	*ops;
+	u32			rx_xfer_offset;
+	u32			tx_xfer_offset;
+	u32			last_xfer_size;
+	unsigned int		op_timeout;
+	u16			mode;
+	u16			flags;
+	u32			bits_per_word_mask;
+	u8			num_chipselect;
+	u32			min_speed_hz;
+	u32			max_speed_hz;
+};
+
+#define GB_SPI_STATE_MSG_DONE		((void *)0)
+#define GB_SPI_STATE_MSG_IDLE		((void *)1)
+#define GB_SPI_STATE_MSG_RUNNING	((void *)2)
+#define GB_SPI_STATE_OP_READY		((void *)3)
+#define GB_SPI_STATE_OP_DONE		((void *)4)
+#define GB_SPI_STATE_MSG_ERROR		((void *)-1)
+
+#define XFER_TIMEOUT_TOLERANCE		200
+
+static struct spi_master *get_master_from_spi(struct gb_spilib *spi)
+{
+	return gb_connection_get_data(spi->connection);
+}
+
+static int tx_header_fit_operation(u32 tx_size, u32 count, size_t data_max)
+{
+	size_t headers_size;
+
+	data_max -= sizeof(struct gb_spi_transfer_request);
+	headers_size = (count + 1) * sizeof(struct gb_spi_transfer);
+
+	return tx_size + headers_size > data_max ? 0 : 1;
+}
+
+static size_t calc_rx_xfer_size(u32 rx_size, u32 *tx_xfer_size, u32 len,
+				size_t data_max)
+{
+	size_t rx_xfer_size;
+
+	data_max -= sizeof(struct gb_spi_transfer_response);
+
+	if (rx_size + len > data_max)
+		rx_xfer_size = data_max - rx_size;
+	else
+		rx_xfer_size = len;
+
+	/* if this is a write_read, for symmetry read the same as write */
+	if (*tx_xfer_size && rx_xfer_size > *tx_xfer_size)
+		rx_xfer_size = *tx_xfer_size;
+	if (*tx_xfer_size && rx_xfer_size < *tx_xfer_size)
+		*tx_xfer_size = rx_xfer_size;
+
+	return rx_xfer_size;
+}
+
+static size_t calc_tx_xfer_size(u32 tx_size, u32 count, size_t len,
+				size_t data_max)
+{
+	size_t headers_size;
+
+	data_max -= sizeof(struct gb_spi_transfer_request);
+	headers_size = (count + 1) * sizeof(struct gb_spi_transfer);
+
+	if (tx_size + headers_size + len > data_max)
+		return data_max - (tx_size + sizeof(struct gb_spi_transfer));
+
+	return len;
+}
+
+static void clean_xfer_state(struct gb_spilib *spi)
+{
+	spi->first_xfer = NULL;
+	spi->last_xfer = NULL;
+	spi->rx_xfer_offset = 0;
+	spi->tx_xfer_offset = 0;
+	spi->last_xfer_size = 0;
+	spi->op_timeout = 0;
+}
+
+static bool is_last_xfer_done(struct gb_spilib *spi)
+{
+	struct spi_transfer *last_xfer = spi->last_xfer;
+
+	if ((spi->tx_xfer_offset + spi->last_xfer_size == last_xfer->len) ||
+	    (spi->rx_xfer_offset + spi->last_xfer_size == last_xfer->len))
+		return true;
+
+	return false;
+}
+
+static int setup_next_xfer(struct gb_spilib *spi, struct spi_message *msg)
+{
+	struct spi_transfer *last_xfer = spi->last_xfer;
+
+	if (msg->state != GB_SPI_STATE_OP_DONE)
+		return 0;
+
+	/*
+	 * if we transferred all content of the last transfer, reset values and
+	 * check if this was the last transfer in the message
+	 */
+	if (is_last_xfer_done(spi)) {
+		spi->tx_xfer_offset = 0;
+		spi->rx_xfer_offset = 0;
+		spi->op_timeout = 0;
+		if (last_xfer == list_last_entry(&msg->transfers,
+						 struct spi_transfer,
+						 transfer_list))
+			msg->state = GB_SPI_STATE_MSG_DONE;
+		else
+			spi->first_xfer = list_next_entry(last_xfer,
+							  transfer_list);
+		return 0;
+	}
+
+	spi->first_xfer = last_xfer;
+	if (last_xfer->tx_buf)
+		spi->tx_xfer_offset += spi->last_xfer_size;
+
+	if (last_xfer->rx_buf)
+		spi->rx_xfer_offset += spi->last_xfer_size;
+
+	return 0;
+}
+
+static struct spi_transfer *get_next_xfer(struct spi_transfer *xfer,
+					  struct spi_message *msg)
+{
+	if (xfer == list_last_entry(&msg->transfers, struct spi_transfer,
+				    transfer_list))
+		return NULL;
+
+	return list_next_entry(xfer, transfer_list);
+}
+
+/* Routines to transfer data */
+static struct gb_operation *gb_spi_operation_create(struct gb_spilib *spi,
+		struct gb_connection *connection, struct spi_message *msg)
+{
+	struct gb_spi_transfer_request *request;
+	struct spi_device *dev = msg->spi;
+	struct spi_transfer *xfer;
+	struct gb_spi_transfer *gb_xfer;
+	struct gb_operation *operation;
+	u32 tx_size = 0, rx_size = 0, count = 0, xfer_len = 0, request_size;
+	u32 tx_xfer_size = 0, rx_xfer_size = 0, len;
+	u32 total_len = 0;
+	unsigned int xfer_timeout;
+	size_t data_max;
+	void *tx_data;
+
+	data_max = gb_operation_get_payload_size_max(connection);
+	xfer = spi->first_xfer;
+
+	/* Find number of transfers queued and tx/rx length in the message */
+
+	while (msg->state != GB_SPI_STATE_OP_READY) {
+		msg->state = GB_SPI_STATE_MSG_RUNNING;
+		spi->last_xfer = xfer;
+
+		if (!xfer->tx_buf && !xfer->rx_buf) {
+			dev_err(spi->parent,
+				"bufferless transfer, length %u\n", xfer->len);
+			msg->state = GB_SPI_STATE_MSG_ERROR;
+			return NULL;
+		}
+
+		tx_xfer_size = 0;
+		rx_xfer_size = 0;
+
+		if (xfer->tx_buf) {
+			len = xfer->len - spi->tx_xfer_offset;
+			if (!tx_header_fit_operation(tx_size, count, data_max))
+				break;
+			tx_xfer_size = calc_tx_xfer_size(tx_size, count,
+							 len, data_max);
+			spi->last_xfer_size = tx_xfer_size;
+		}
+
+		if (xfer->rx_buf) {
+			len = xfer->len - spi->rx_xfer_offset;
+			rx_xfer_size = calc_rx_xfer_size(rx_size, &tx_xfer_size,
+							 len, data_max);
+			spi->last_xfer_size = rx_xfer_size;
+		}
+
+		tx_size += tx_xfer_size;
+		rx_size += rx_xfer_size;
+
+		total_len += spi->last_xfer_size;
+		count++;
+
+		xfer = get_next_xfer(xfer, msg);
+		if (!xfer || total_len >= data_max)
+			msg->state = GB_SPI_STATE_OP_READY;
+	}
+
+	/*
+	 * In addition to space for all message descriptors we need
+	 * to have enough to hold all tx data.
+	 */
+	request_size = sizeof(*request);
+	request_size += count * sizeof(*gb_xfer);
+	request_size += tx_size;
+
+	/* Response consists only of incoming data */
+	operation = gb_operation_create(connection, GB_SPI_TYPE_TRANSFER,
+					request_size, rx_size, GFP_KERNEL);
+	if (!operation)
+		return NULL;
+
+	request = operation->request->payload;
+	request->count = cpu_to_le16(count);
+	request->mode = dev->mode;
+	request->chip_select = dev->chip_select;
+
+	gb_xfer = &request->transfers[0];
+	tx_data = gb_xfer + count;	/* place tx data after last gb_xfer */
+
+	/* Fill in the transfers array */
+	xfer = spi->first_xfer;
+	while (msg->state != GB_SPI_STATE_OP_DONE) {
+		int xfer_delay;
+
+		if (xfer == spi->last_xfer)
+			xfer_len = spi->last_xfer_size;
+		else
+			xfer_len = xfer->len;
+
+		/* make sure we do not timeout in a slow transfer */
+		xfer_timeout = xfer_len * 8 * MSEC_PER_SEC / xfer->speed_hz;
+		xfer_timeout += GB_OPERATION_TIMEOUT_DEFAULT;
+
+		if (xfer_timeout > spi->op_timeout)
+			spi->op_timeout = xfer_timeout;
+
+		gb_xfer->speed_hz = cpu_to_le32(xfer->speed_hz);
+		gb_xfer->len = cpu_to_le32(xfer_len);
+		xfer_delay = spi_delay_to_ns(&xfer->delay, xfer) / 1000;
+		xfer_delay = clamp_t(u16, xfer_delay, 0, U16_MAX);
+		gb_xfer->delay_usecs = cpu_to_le16(xfer_delay);
+		gb_xfer->cs_change = xfer->cs_change;
+		gb_xfer->bits_per_word = xfer->bits_per_word;
+
+		/* Copy tx data */
+		if (xfer->tx_buf) {
+			gb_xfer->xfer_flags |= GB_SPI_XFER_WRITE;
+			memcpy(tx_data, xfer->tx_buf + spi->tx_xfer_offset,
+			       xfer_len);
+			tx_data += xfer_len;
+		}
+
+		if (xfer->rx_buf)
+			gb_xfer->xfer_flags |= GB_SPI_XFER_READ;
+
+		if (xfer == spi->last_xfer) {
+			if (!is_last_xfer_done(spi))
+				gb_xfer->xfer_flags |= GB_SPI_XFER_INPROGRESS;
+			msg->state = GB_SPI_STATE_OP_DONE;
+			continue;
+		}
+
+		gb_xfer++;
+		xfer = get_next_xfer(xfer, msg);
+	}
+
+	msg->actual_length += total_len;
+
+	return operation;
+}
+
+static void gb_spi_decode_response(struct gb_spilib *spi,
+				   struct spi_message *msg,
+				   struct gb_spi_transfer_response *response)
+{
+	struct spi_transfer *xfer = spi->first_xfer;
+	void *rx_data = response->data;
+	u32 xfer_len;
+
+	while (xfer) {
+		/* Copy rx data */
+		if (xfer->rx_buf) {
+			if (xfer == spi->first_xfer)
+				xfer_len = xfer->len - spi->rx_xfer_offset;
+			else if (xfer == spi->last_xfer)
+				xfer_len = spi->last_xfer_size;
+			else
+				xfer_len = xfer->len;
+
+			memcpy(xfer->rx_buf + spi->rx_xfer_offset, rx_data,
+			       xfer_len);
+			rx_data += xfer_len;
+		}
+
+		if (xfer == spi->last_xfer)
+			break;
+
+		xfer = list_next_entry(xfer, transfer_list);
+	}
+}
+
+static int gb_spi_transfer_one_message(struct spi_master *master,
+				       struct spi_message *msg)
+{
+	struct gb_spilib *spi = spi_master_get_devdata(master);
+	struct gb_connection *connection = spi->connection;
+	struct gb_spi_transfer_response *response;
+	struct gb_operation *operation;
+	int ret = 0;
+
+	spi->first_xfer = list_first_entry_or_null(&msg->transfers,
+						   struct spi_transfer,
+						   transfer_list);
+	if (!spi->first_xfer) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	msg->state = GB_SPI_STATE_MSG_IDLE;
+
+	while (msg->state != GB_SPI_STATE_MSG_DONE &&
+	       msg->state != GB_SPI_STATE_MSG_ERROR) {
+		operation = gb_spi_operation_create(spi, connection, msg);
+		if (!operation) {
+			msg->state = GB_SPI_STATE_MSG_ERROR;
+			ret = -EINVAL;
+			continue;
+		}
+
+		ret = gb_operation_request_send_sync_timeout(operation,
+							     spi->op_timeout);
+		if (!ret) {
+			response = operation->response->payload;
+			if (response)
+				gb_spi_decode_response(spi, msg, response);
+		} else {
+			dev_err(spi->parent,
+				"transfer operation failed: %d\n", ret);
+			msg->state = GB_SPI_STATE_MSG_ERROR;
+		}
+
+		gb_operation_put(operation);
+		setup_next_xfer(spi, msg);
+	}
+
+out:
+	msg->status = ret;
+	clean_xfer_state(spi);
+	spi_finalize_current_message(master);
+
+	return ret;
+}
+
+static int gb_spi_prepare_transfer_hardware(struct spi_master *master)
+{
+	struct gb_spilib *spi = spi_master_get_devdata(master);
+
+	return spi->ops->prepare_transfer_hardware(spi->parent);
+}
+
+static int gb_spi_unprepare_transfer_hardware(struct spi_master *master)
+{
+	struct gb_spilib *spi = spi_master_get_devdata(master);
+
+	spi->ops->unprepare_transfer_hardware(spi->parent);
+
+	return 0;
+}
+
+static int gb_spi_setup(struct spi_device *spi)
+{
+	/* Nothing to do for now */
+	return 0;
+}
+
+static void gb_spi_cleanup(struct spi_device *spi)
+{
+	/* Nothing to do for now */
+}
+
+/* Routines to get controller information */
+
+/*
+ * Map Greybus spi mode bits/flags/bpw into Linux ones.
+ * All bits are same for now and so these macro's return same values.
+ */
+#define gb_spi_mode_map(mode) mode
+#define gb_spi_flags_map(flags) flags
+
+static int gb_spi_get_master_config(struct gb_spilib *spi)
+{
+	struct gb_spi_master_config_response response;
+	u16 mode, flags;
+	int ret;
+
+	ret = gb_operation_sync(spi->connection, GB_SPI_TYPE_MASTER_CONFIG,
+				NULL, 0, &response, sizeof(response));
+	if (ret < 0)
+		return ret;
+
+	mode = le16_to_cpu(response.mode);
+	spi->mode = gb_spi_mode_map(mode);
+
+	flags = le16_to_cpu(response.flags);
+	spi->flags = gb_spi_flags_map(flags);
+
+	spi->bits_per_word_mask = le32_to_cpu(response.bits_per_word_mask);
+	spi->num_chipselect = response.num_chipselect;
+
+	spi->min_speed_hz = le32_to_cpu(response.min_speed_hz);
+	spi->max_speed_hz = le32_to_cpu(response.max_speed_hz);
+
+	return 0;
+}
+
+static int gb_spi_setup_device(struct gb_spilib *spi, u8 cs)
+{
+	struct spi_master *master = get_master_from_spi(spi);
+	struct gb_spi_device_config_request request;
+	struct gb_spi_device_config_response response;
+	struct spi_board_info spi_board = { {0} };
+	struct spi_device *spidev;
+	int ret;
+	u8 dev_type;
+
+	request.chip_select = cs;
+
+	ret = gb_operation_sync(spi->connection, GB_SPI_TYPE_DEVICE_CONFIG,
+				&request, sizeof(request),
+				&response, sizeof(response));
+	if (ret < 0)
+		return ret;
+
+	dev_type = response.device_type;
+
+	if (dev_type == GB_SPI_SPI_DEV)
+		strscpy(spi_board.modalias, "spidev",
+			sizeof(spi_board.modalias));
+	else if (dev_type == GB_SPI_SPI_NOR)
+		strscpy(spi_board.modalias, "spi-nor",
+			sizeof(spi_board.modalias));
+	else if (dev_type == GB_SPI_SPI_MODALIAS)
+		memcpy(spi_board.modalias, response.name,
+		       sizeof(spi_board.modalias));
+	else
+		return -EINVAL;
+
+	spi_board.mode		= le16_to_cpu(response.mode);
+	spi_board.bus_num	= master->bus_num;
+	spi_board.chip_select	= cs;
+	spi_board.max_speed_hz	= le32_to_cpu(response.max_speed_hz);
+
+	spidev = spi_new_device(master, &spi_board);
+	if (!spidev)
+		return -EINVAL;
+
+	return 0;
+}
+
+int gb_spilib_master_init(struct gb_connection *connection, struct device *dev,
+			  struct spilib_ops *ops)
+{
+	struct gb_spilib *spi;
+	struct spi_master *master;
+	int ret;
+	u8 i;
+
+	/* Allocate master with space for data */
+	master = spi_alloc_master(dev, sizeof(*spi));
+	if (!master) {
+		dev_err(dev, "cannot alloc SPI master\n");
+		return -ENOMEM;
+	}
+
+	spi = spi_master_get_devdata(master);
+	spi->connection = connection;
+	gb_connection_set_data(connection, master);
+	spi->parent = dev;
+	spi->ops = ops;
+
+	/* get master configuration */
+	ret = gb_spi_get_master_config(spi);
+	if (ret)
+		goto exit_spi_put;
+
+	master->bus_num = -1; /* Allow spi-core to allocate it dynamically */
+	master->num_chipselect = spi->num_chipselect;
+	master->mode_bits = spi->mode;
+	master->flags = spi->flags;
+	master->bits_per_word_mask = spi->bits_per_word_mask;
+
+	/* Attach methods */
+	master->cleanup = gb_spi_cleanup;
+	master->setup = gb_spi_setup;
+	master->transfer_one_message = gb_spi_transfer_one_message;
+
+	if (ops && ops->prepare_transfer_hardware) {
+		master->prepare_transfer_hardware =
+			gb_spi_prepare_transfer_hardware;
+	}
+
+	if (ops && ops->unprepare_transfer_hardware) {
+		master->unprepare_transfer_hardware =
+			gb_spi_unprepare_transfer_hardware;
+	}
+
+	master->auto_runtime_pm = true;
+
+	ret = spi_register_master(master);
+	if (ret < 0)
+		goto exit_spi_put;
+
+	/* now, fetch the devices configuration */
+	for (i = 0; i < spi->num_chipselect; i++) {
+		ret = gb_spi_setup_device(spi, i);
+		if (ret < 0) {
+			dev_err(dev, "failed to allocate spi device %d: %d\n",
+				i, ret);
+			goto exit_spi_unregister;
+		}
+	}
+
+	return 0;
+
+exit_spi_put:
+	spi_master_put(master);
+
+	return ret;
+
+exit_spi_unregister:
+	spi_unregister_master(master);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(gb_spilib_master_init);
+
+void gb_spilib_master_exit(struct gb_connection *connection)
+{
+	struct spi_master *master = gb_connection_get_data(connection);
+
+	spi_unregister_master(master);
+}
+EXPORT_SYMBOL_GPL(gb_spilib_master_exit);
+
+MODULE_LICENSE("GPL v2");