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, 438 insertions, 0 deletions

diff --git a/drivers/watchdog/cadence_wdt.c b/drivers/watchdog/cadence_wdt.c
new file mode 100644
index 000000000..bc99e9164
--- /dev/null
+++ b/drivers/watchdog/cadence_wdt.c
@@ -0,0 +1,438 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Cadence WDT driver - Used by Xilinx Zynq
+ *
+ * Copyright (C) 2010 - 2014 Xilinx, Inc.
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/watchdog.h>
+
+#define CDNS_WDT_DEFAULT_TIMEOUT	10
+/* Supports 1 - 516 sec */
+#define CDNS_WDT_MIN_TIMEOUT	1
+#define CDNS_WDT_MAX_TIMEOUT	516
+
+/* Restart key */
+#define CDNS_WDT_RESTART_KEY 0x00001999
+
+/* Counter register access key */
+#define CDNS_WDT_REGISTER_ACCESS_KEY 0x00920000
+
+/* Counter value divisor */
+#define CDNS_WDT_COUNTER_VALUE_DIVISOR 0x1000
+
+/* Clock prescaler value and selection */
+#define CDNS_WDT_PRESCALE_64	64
+#define CDNS_WDT_PRESCALE_512	512
+#define CDNS_WDT_PRESCALE_4096	4096
+#define CDNS_WDT_PRESCALE_SELECT_64	1
+#define CDNS_WDT_PRESCALE_SELECT_512	2
+#define CDNS_WDT_PRESCALE_SELECT_4096	3
+
+/* Input clock frequency */
+#define CDNS_WDT_CLK_10MHZ	10000000
+#define CDNS_WDT_CLK_75MHZ	75000000
+
+/* Counter maximum value */
+#define CDNS_WDT_COUNTER_MAX 0xFFF
+
+static int wdt_timeout;
+static int nowayout = WATCHDOG_NOWAYOUT;
+
+module_param(wdt_timeout, int, 0644);
+MODULE_PARM_DESC(wdt_timeout,
+		 "Watchdog time in seconds. (default="
+		 __MODULE_STRING(CDNS_WDT_DEFAULT_TIMEOUT) ")");
+
+module_param(nowayout, int, 0644);
+MODULE_PARM_DESC(nowayout,
+		 "Watchdog cannot be stopped once started (default="
+		 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+/**
+ * struct cdns_wdt - Watchdog device structure
+ * @regs: baseaddress of device
+ * @rst: reset flag
+ * @clk: struct clk * of a clock source
+ * @prescaler: for saving prescaler value
+ * @ctrl_clksel: counter clock prescaler selection
+ * @io_lock: spinlock for IO register access
+ * @cdns_wdt_device: watchdog device structure
+ *
+ * Structure containing parameters specific to cadence watchdog.
+ */
+struct cdns_wdt {
+	void __iomem		*regs;
+	bool			rst;
+	struct clk		*clk;
+	u32			prescaler;
+	u32			ctrl_clksel;
+	spinlock_t		io_lock;
+	struct watchdog_device	cdns_wdt_device;
+};
+
+/* Write access to Registers */
+static inline void cdns_wdt_writereg(struct cdns_wdt *wdt, u32 offset, u32 val)
+{
+	writel_relaxed(val, wdt->regs + offset);
+}
+
+/*************************Register Map**************************************/
+
+/* Register Offsets for the WDT */
+#define CDNS_WDT_ZMR_OFFSET	0x0	/* Zero Mode Register */
+#define CDNS_WDT_CCR_OFFSET	0x4	/* Counter Control Register */
+#define CDNS_WDT_RESTART_OFFSET	0x8	/* Restart Register */
+#define CDNS_WDT_SR_OFFSET	0xC	/* Status Register */
+
+/*
+ * Zero Mode Register - This register controls how the time out is indicated
+ * and also contains the access code to allow writes to the register (0xABC).
+ */
+#define CDNS_WDT_ZMR_WDEN_MASK	0x00000001 /* Enable the WDT */
+#define CDNS_WDT_ZMR_RSTEN_MASK	0x00000002 /* Enable the reset output */
+#define CDNS_WDT_ZMR_IRQEN_MASK	0x00000004 /* Enable IRQ output */
+#define CDNS_WDT_ZMR_RSTLEN_16	0x00000030 /* Reset pulse of 16 pclk cycles */
+#define CDNS_WDT_ZMR_ZKEY_VAL	0x00ABC000 /* Access key, 0xABC << 12 */
+/*
+ * Counter Control register - This register controls how fast the timer runs
+ * and the reset value and also contains the access code to allow writes to
+ * the register.
+ */
+#define CDNS_WDT_CCR_CRV_MASK	0x00003FFC /* Counter reset value */
+
+/**
+ * cdns_wdt_stop - Stop the watchdog.
+ *
+ * @wdd: watchdog device
+ *
+ * Read the contents of the ZMR register, clear the WDEN bit
+ * in the register and set the access key for successful write.
+ *
+ * Return: always 0
+ */
+static int cdns_wdt_stop(struct watchdog_device *wdd)
+{
+	struct cdns_wdt *wdt = watchdog_get_drvdata(wdd);
+
+	spin_lock(&wdt->io_lock);
+	cdns_wdt_writereg(wdt, CDNS_WDT_ZMR_OFFSET,
+			  CDNS_WDT_ZMR_ZKEY_VAL & (~CDNS_WDT_ZMR_WDEN_MASK));
+	spin_unlock(&wdt->io_lock);
+
+	return 0;
+}
+
+/**
+ * cdns_wdt_reload - Reload the watchdog timer (i.e. pat the watchdog).
+ *
+ * @wdd: watchdog device
+ *
+ * Write the restart key value (0x00001999) to the restart register.
+ *
+ * Return: always 0
+ */
+static int cdns_wdt_reload(struct watchdog_device *wdd)
+{
+	struct cdns_wdt *wdt = watchdog_get_drvdata(wdd);
+
+	spin_lock(&wdt->io_lock);
+	cdns_wdt_writereg(wdt, CDNS_WDT_RESTART_OFFSET,
+			  CDNS_WDT_RESTART_KEY);
+	spin_unlock(&wdt->io_lock);
+
+	return 0;
+}
+
+/**
+ * cdns_wdt_start - Enable and start the watchdog.
+ *
+ * @wdd: watchdog device
+ *
+ * The counter value is calculated according to the formula:
+ *		calculated count = (timeout * clock) / prescaler + 1.
+ * The calculated count is divided by 0x1000 to obtain the field value
+ * to write to counter control register.
+ * Clears the contents of prescaler and counter reset value. Sets the
+ * prescaler to 4096 and the calculated count and access key
+ * to write to CCR Register.
+ * Sets the WDT (WDEN bit) and either the Reset signal(RSTEN bit)
+ * or Interrupt signal(IRQEN) with a specified cycles and the access
+ * key to write to ZMR Register.
+ *
+ * Return: always 0
+ */
+static int cdns_wdt_start(struct watchdog_device *wdd)
+{
+	struct cdns_wdt *wdt = watchdog_get_drvdata(wdd);
+	unsigned int data = 0;
+	unsigned short count;
+	unsigned long clock_f = clk_get_rate(wdt->clk);
+
+	/*
+	 * Counter value divisor to obtain the value of
+	 * counter reset to be written to control register.
+	 */
+	count = (wdd->timeout * (clock_f / wdt->prescaler)) /
+		 CDNS_WDT_COUNTER_VALUE_DIVISOR + 1;
+
+	if (count > CDNS_WDT_COUNTER_MAX)
+		count = CDNS_WDT_COUNTER_MAX;
+
+	spin_lock(&wdt->io_lock);
+	cdns_wdt_writereg(wdt, CDNS_WDT_ZMR_OFFSET,
+			  CDNS_WDT_ZMR_ZKEY_VAL);
+
+	count = (count << 2) & CDNS_WDT_CCR_CRV_MASK;
+
+	/* Write counter access key first to be able write to register */
+	data = count | CDNS_WDT_REGISTER_ACCESS_KEY | wdt->ctrl_clksel;
+	cdns_wdt_writereg(wdt, CDNS_WDT_CCR_OFFSET, data);
+	data = CDNS_WDT_ZMR_WDEN_MASK | CDNS_WDT_ZMR_RSTLEN_16 |
+	       CDNS_WDT_ZMR_ZKEY_VAL;
+
+	/* Reset on timeout if specified in device tree. */
+	if (wdt->rst) {
+		data |= CDNS_WDT_ZMR_RSTEN_MASK;
+		data &= ~CDNS_WDT_ZMR_IRQEN_MASK;
+	} else {
+		data &= ~CDNS_WDT_ZMR_RSTEN_MASK;
+		data |= CDNS_WDT_ZMR_IRQEN_MASK;
+	}
+	cdns_wdt_writereg(wdt, CDNS_WDT_ZMR_OFFSET, data);
+	cdns_wdt_writereg(wdt, CDNS_WDT_RESTART_OFFSET,
+			  CDNS_WDT_RESTART_KEY);
+	spin_unlock(&wdt->io_lock);
+
+	return 0;
+}
+
+/**
+ * cdns_wdt_settimeout - Set a new timeout value for the watchdog device.
+ *
+ * @wdd: watchdog device
+ * @new_time: new timeout value that needs to be set
+ * Return: 0 on success
+ *
+ * Update the watchdog_device timeout with new value which is used when
+ * cdns_wdt_start is called.
+ */
+static int cdns_wdt_settimeout(struct watchdog_device *wdd,
+			       unsigned int new_time)
+{
+	wdd->timeout = new_time;
+
+	return cdns_wdt_start(wdd);
+}
+
+/**
+ * cdns_wdt_irq_handler - Notifies of watchdog timeout.
+ *
+ * @irq: interrupt number
+ * @dev_id: pointer to a platform device structure
+ * Return: IRQ_HANDLED
+ *
+ * The handler is invoked when the watchdog times out and a
+ * reset on timeout has not been enabled.
+ */
+static irqreturn_t cdns_wdt_irq_handler(int irq, void *dev_id)
+{
+	struct platform_device *pdev = dev_id;
+
+	dev_info(&pdev->dev,
+		 "Watchdog timed out. Internal reset not enabled\n");
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * Info structure used to indicate the features supported by the device
+ * to the upper layers. This is defined in watchdog.h header file.
+ */
+static const struct watchdog_info cdns_wdt_info = {
+	.identity	= "cdns_wdt watchdog",
+	.options	= WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
+			  WDIOF_MAGICCLOSE,
+};
+
+/* Watchdog Core Ops */
+static const struct watchdog_ops cdns_wdt_ops = {
+	.owner = THIS_MODULE,
+	.start = cdns_wdt_start,
+	.stop = cdns_wdt_stop,
+	.ping = cdns_wdt_reload,
+	.set_timeout = cdns_wdt_settimeout,
+};
+
+static void cdns_clk_disable_unprepare(void *data)
+{
+	clk_disable_unprepare(data);
+}
+
+/************************Platform Operations*****************************/
+/**
+ * cdns_wdt_probe - Probe call for the device.
+ *
+ * @pdev: handle to the platform device structure.
+ * Return: 0 on success, negative error otherwise.
+ *
+ * It does all the memory allocation and registration for the device.
+ */
+static int cdns_wdt_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	int ret, irq;
+	unsigned long clock_f;
+	struct cdns_wdt *wdt;
+	struct watchdog_device *cdns_wdt_device;
+
+	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
+	if (!wdt)
+		return -ENOMEM;
+
+	cdns_wdt_device = &wdt->cdns_wdt_device;
+	cdns_wdt_device->info = &cdns_wdt_info;
+	cdns_wdt_device->ops = &cdns_wdt_ops;
+	cdns_wdt_device->timeout = CDNS_WDT_DEFAULT_TIMEOUT;
+	cdns_wdt_device->min_timeout = CDNS_WDT_MIN_TIMEOUT;
+	cdns_wdt_device->max_timeout = CDNS_WDT_MAX_TIMEOUT;
+
+	wdt->regs = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(wdt->regs))
+		return PTR_ERR(wdt->regs);
+
+	/* Register the interrupt */
+	wdt->rst = of_property_read_bool(dev->of_node, "reset-on-timeout");
+	irq = platform_get_irq(pdev, 0);
+	if (!wdt->rst && irq >= 0) {
+		ret = devm_request_irq(dev, irq, cdns_wdt_irq_handler, 0,
+				       pdev->name, pdev);
+		if (ret) {
+			dev_err(dev,
+				"cannot register interrupt handler err=%d\n",
+				ret);
+			return ret;
+		}
+	}
+
+	/* Initialize the members of cdns_wdt structure */
+	cdns_wdt_device->parent = dev;
+
+	watchdog_init_timeout(cdns_wdt_device, wdt_timeout, dev);
+	watchdog_set_nowayout(cdns_wdt_device, nowayout);
+	watchdog_stop_on_reboot(cdns_wdt_device);
+	watchdog_set_drvdata(cdns_wdt_device, wdt);
+
+	wdt->clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(wdt->clk))
+		return dev_err_probe(dev, PTR_ERR(wdt->clk),
+				     "input clock not found\n");
+
+	ret = clk_prepare_enable(wdt->clk);
+	if (ret) {
+		dev_err(dev, "unable to enable clock\n");
+		return ret;
+	}
+	ret = devm_add_action_or_reset(dev, cdns_clk_disable_unprepare,
+				       wdt->clk);
+	if (ret)
+		return ret;
+
+	clock_f = clk_get_rate(wdt->clk);
+	if (clock_f <= CDNS_WDT_CLK_75MHZ) {
+		wdt->prescaler = CDNS_WDT_PRESCALE_512;
+		wdt->ctrl_clksel = CDNS_WDT_PRESCALE_SELECT_512;
+	} else {
+		wdt->prescaler = CDNS_WDT_PRESCALE_4096;
+		wdt->ctrl_clksel = CDNS_WDT_PRESCALE_SELECT_4096;
+	}
+
+	spin_lock_init(&wdt->io_lock);
+
+	watchdog_stop_on_reboot(cdns_wdt_device);
+	watchdog_stop_on_unregister(cdns_wdt_device);
+	ret = devm_watchdog_register_device(dev, cdns_wdt_device);
+	if (ret)
+		return ret;
+	platform_set_drvdata(pdev, wdt);
+
+	dev_info(dev, "Xilinx Watchdog Timer with timeout %ds%s\n",
+		 cdns_wdt_device->timeout, nowayout ? ", nowayout" : "");
+
+	return 0;
+}
+
+/**
+ * cdns_wdt_suspend - Stop the device.
+ *
+ * @dev: handle to the device structure.
+ * Return: 0 always.
+ */
+static int __maybe_unused cdns_wdt_suspend(struct device *dev)
+{
+	struct cdns_wdt *wdt = dev_get_drvdata(dev);
+
+	if (watchdog_active(&wdt->cdns_wdt_device)) {
+		cdns_wdt_stop(&wdt->cdns_wdt_device);
+		clk_disable_unprepare(wdt->clk);
+	}
+
+	return 0;
+}
+
+/**
+ * cdns_wdt_resume - Resume the device.
+ *
+ * @dev: handle to the device structure.
+ * Return: 0 on success, errno otherwise.
+ */
+static int __maybe_unused cdns_wdt_resume(struct device *dev)
+{
+	int ret;
+	struct cdns_wdt *wdt = dev_get_drvdata(dev);
+
+	if (watchdog_active(&wdt->cdns_wdt_device)) {
+		ret = clk_prepare_enable(wdt->clk);
+		if (ret) {
+			dev_err(dev, "unable to enable clock\n");
+			return ret;
+		}
+		cdns_wdt_start(&wdt->cdns_wdt_device);
+	}
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(cdns_wdt_pm_ops, cdns_wdt_suspend, cdns_wdt_resume);
+
+static const struct of_device_id cdns_wdt_of_match[] = {
+	{ .compatible = "cdns,wdt-r1p2", },
+	{ /* end of table */ }
+};
+MODULE_DEVICE_TABLE(of, cdns_wdt_of_match);
+
+/* Driver Structure */
+static struct platform_driver cdns_wdt_driver = {
+	.probe		= cdns_wdt_probe,
+	.driver		= {
+		.name	= "cdns-wdt",
+		.of_match_table = cdns_wdt_of_match,
+		.pm	= &cdns_wdt_pm_ops,
+	},
+};
+
+module_platform_driver(cdns_wdt_driver);
+
+MODULE_AUTHOR("Xilinx, Inc.");
+MODULE_DESCRIPTION("Watchdog driver for Cadence WDT");
+MODULE_LICENSE("GPL");