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, 662 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-ti-k3.c b/drivers/rtc/rtc-ti-k3.c
new file mode 100644
index 000000000..ba23163cc
--- /dev/null
+++ b/drivers/rtc/rtc-ti-k3.c
@@ -0,0 +1,662 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Texas Instruments K3 RTC driver
+ *
+ * Copyright (C) 2021-2022 Texas Instruments Incorporated - https://www.ti.com/
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/sys_soc.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/rtc.h>
+
+/* Registers */
+#define REG_K3RTC_S_CNT_LSW		0x08
+#define REG_K3RTC_S_CNT_MSW		0x0c
+#define REG_K3RTC_COMP			0x10
+#define REG_K3RTC_ON_OFF_S_CNT_LSW	0x20
+#define REG_K3RTC_ON_OFF_S_CNT_MSW	0x24
+#define REG_K3RTC_SCRATCH0		0x30
+#define REG_K3RTC_SCRATCH7		0x4c
+#define REG_K3RTC_GENERAL_CTL		0x50
+#define REG_K3RTC_IRQSTATUS_RAW_SYS	0x54
+#define REG_K3RTC_IRQSTATUS_SYS		0x58
+#define REG_K3RTC_IRQENABLE_SET_SYS	0x5c
+#define REG_K3RTC_IRQENABLE_CLR_SYS	0x60
+#define REG_K3RTC_SYNCPEND		0x68
+#define REG_K3RTC_KICK0			0x70
+#define REG_K3RTC_KICK1			0x74
+
+/* Freeze when lsw is read and unfreeze when msw is read */
+#define K3RTC_CNT_FMODE_S_CNT_VALUE	(0x2 << 24)
+
+/* Magic values for lock/unlock */
+#define K3RTC_KICK0_UNLOCK_VALUE	0x83e70b13
+#define K3RTC_KICK1_UNLOCK_VALUE	0x95a4f1e0
+
+/* Multiplier for ppb conversions */
+#define K3RTC_PPB_MULT			(1000000000LL)
+/* Min and max values supported with 'offset' interface (swapped sign) */
+#define K3RTC_MIN_OFFSET		(-277761)
+#define K3RTC_MAX_OFFSET		(277778)
+
+static const struct regmap_config ti_k3_rtc_regmap_config = {
+	.name = "peripheral-registers",
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+	.max_register = REG_K3RTC_KICK1,
+};
+
+enum ti_k3_rtc_fields {
+	K3RTC_KICK0,
+	K3RTC_KICK1,
+	K3RTC_S_CNT_LSW,
+	K3RTC_S_CNT_MSW,
+	K3RTC_O32K_OSC_DEP_EN,
+	K3RTC_UNLOCK,
+	K3RTC_CNT_FMODE,
+	K3RTC_PEND,
+	K3RTC_RELOAD_FROM_BBD,
+	K3RTC_COMP,
+
+	K3RTC_ALM_S_CNT_LSW,
+	K3RTC_ALM_S_CNT_MSW,
+	K3RTC_IRQ_STATUS_RAW,
+	K3RTC_IRQ_STATUS,
+	K3RTC_IRQ_ENABLE_SET,
+	K3RTC_IRQ_ENABLE_CLR,
+
+	K3RTC_IRQ_STATUS_ALT,
+	K3RTC_IRQ_ENABLE_CLR_ALT,
+
+	K3_RTC_MAX_FIELDS
+};
+
+static const struct reg_field ti_rtc_reg_fields[] = {
+	[K3RTC_KICK0] = REG_FIELD(REG_K3RTC_KICK0, 0, 31),
+	[K3RTC_KICK1] = REG_FIELD(REG_K3RTC_KICK1, 0, 31),
+	[K3RTC_S_CNT_LSW] = REG_FIELD(REG_K3RTC_S_CNT_LSW, 0, 31),
+	[K3RTC_S_CNT_MSW] = REG_FIELD(REG_K3RTC_S_CNT_MSW, 0, 15),
+	[K3RTC_O32K_OSC_DEP_EN] = REG_FIELD(REG_K3RTC_GENERAL_CTL, 21, 21),
+	[K3RTC_UNLOCK] = REG_FIELD(REG_K3RTC_GENERAL_CTL, 23, 23),
+	[K3RTC_CNT_FMODE] = REG_FIELD(REG_K3RTC_GENERAL_CTL, 24, 25),
+	[K3RTC_PEND] = REG_FIELD(REG_K3RTC_SYNCPEND, 0, 1),
+	[K3RTC_RELOAD_FROM_BBD] = REG_FIELD(REG_K3RTC_SYNCPEND, 31, 31),
+	[K3RTC_COMP] = REG_FIELD(REG_K3RTC_COMP, 0, 31),
+
+	/* We use on to off as alarm trigger */
+	[K3RTC_ALM_S_CNT_LSW] = REG_FIELD(REG_K3RTC_ON_OFF_S_CNT_LSW, 0, 31),
+	[K3RTC_ALM_S_CNT_MSW] = REG_FIELD(REG_K3RTC_ON_OFF_S_CNT_MSW, 0, 15),
+	[K3RTC_IRQ_STATUS_RAW] = REG_FIELD(REG_K3RTC_IRQSTATUS_RAW_SYS, 0, 0),
+	[K3RTC_IRQ_STATUS] = REG_FIELD(REG_K3RTC_IRQSTATUS_SYS, 0, 0),
+	[K3RTC_IRQ_ENABLE_SET] = REG_FIELD(REG_K3RTC_IRQENABLE_SET_SYS, 0, 0),
+	[K3RTC_IRQ_ENABLE_CLR] = REG_FIELD(REG_K3RTC_IRQENABLE_CLR_SYS, 0, 0),
+	/* Off to on is alternate */
+	[K3RTC_IRQ_STATUS_ALT] = REG_FIELD(REG_K3RTC_IRQSTATUS_SYS, 1, 1),
+	[K3RTC_IRQ_ENABLE_CLR_ALT] = REG_FIELD(REG_K3RTC_IRQENABLE_CLR_SYS, 1, 1),
+};
+
+/**
+ * struct ti_k3_rtc - Private data for ti-k3-rtc
+ * @irq:		IRQ
+ * @sync_timeout_us:	data sync timeout period in uSec
+ * @rate_32k:		32k clock rate in Hz
+ * @rtc_dev:		rtc device
+ * @regmap:		rtc mmio regmap
+ * @r_fields:		rtc register fields
+ */
+struct ti_k3_rtc {
+	unsigned int irq;
+	u32 sync_timeout_us;
+	unsigned long rate_32k;
+	struct rtc_device *rtc_dev;
+	struct regmap *regmap;
+	struct regmap_field *r_fields[K3_RTC_MAX_FIELDS];
+};
+
+static int k3rtc_field_read(struct ti_k3_rtc *priv, enum ti_k3_rtc_fields f)
+{
+	int ret;
+	int val;
+
+	ret = regmap_field_read(priv->r_fields[f], &val);
+	/*
+	 * We shouldn't be seeing regmap fail on us for mmio reads
+	 * This is possible if clock context fails, but that isn't the case for us
+	 */
+	if (WARN_ON_ONCE(ret))
+		return ret;
+	return val;
+}
+
+static void k3rtc_field_write(struct ti_k3_rtc *priv, enum ti_k3_rtc_fields f, u32 val)
+{
+	regmap_field_write(priv->r_fields[f], val);
+}
+
+/**
+ * k3rtc_fence  - Ensure a register sync took place between the two domains
+ * @priv:      pointer to priv data
+ *
+ * Return: 0 if the sync took place, else returns -ETIMEDOUT
+ */
+static int k3rtc_fence(struct ti_k3_rtc *priv)
+{
+	int ret;
+
+	ret = regmap_field_read_poll_timeout(priv->r_fields[K3RTC_PEND], ret,
+					     !ret, 2, priv->sync_timeout_us);
+
+	return ret;
+}
+
+static inline int k3rtc_check_unlocked(struct ti_k3_rtc *priv)
+{
+	int ret;
+
+	ret = k3rtc_field_read(priv, K3RTC_UNLOCK);
+	if (ret < 0)
+		return ret;
+
+	return (ret) ? 0 : 1;
+}
+
+static int k3rtc_unlock_rtc(struct ti_k3_rtc *priv)
+{
+	int ret;
+
+	ret = k3rtc_check_unlocked(priv);
+	if (!ret)
+		return ret;
+
+	k3rtc_field_write(priv, K3RTC_KICK0, K3RTC_KICK0_UNLOCK_VALUE);
+	k3rtc_field_write(priv, K3RTC_KICK1, K3RTC_KICK1_UNLOCK_VALUE);
+
+	/* Skip fence since we are going to check the unlock bit as fence */
+	ret = regmap_field_read_poll_timeout(priv->r_fields[K3RTC_UNLOCK], ret,
+					     ret, 2, priv->sync_timeout_us);
+
+	return ret;
+}
+
+/*
+ * This is the list of SoCs affected by TI's i2327 errata causing the RTC
+ * state-machine to break if not unlocked fast enough during boot. These
+ * SoCs must have the bootloader unlock this device very early in the
+ * boot-flow before we (Linux) can use this device.
+ */
+static const struct soc_device_attribute has_erratum_i2327[] = {
+	{ .family = "AM62X", .revision = "SR1.0" },
+	{ /* sentinel */ }
+};
+
+static int k3rtc_configure(struct device *dev)
+{
+	int ret;
+	struct ti_k3_rtc *priv = dev_get_drvdata(dev);
+
+	/*
+	 * HWBUG: The compare state machine is broken if the RTC module
+	 * is NOT unlocked in under one second of boot - which is pretty long
+	 * time from the perspective of Linux driver (module load, u-boot
+	 * shell all can take much longer than this.
+	 *
+	 * In such occurrence, it is assumed that the RTC module is unusable
+	 */
+	if (soc_device_match(has_erratum_i2327)) {
+		ret = k3rtc_check_unlocked(priv);
+		/* If there is an error OR if we are locked, return error */
+		if (ret) {
+			dev_err(dev,
+				HW_ERR "Erratum i2327 unlock QUIRK! Cannot operate!!\n");
+			return -EFAULT;
+		}
+	} else {
+		/* May need to explicitly unlock first time */
+		ret = k3rtc_unlock_rtc(priv);
+		if (ret) {
+			dev_err(dev, "Failed to unlock(%d)!\n", ret);
+			return ret;
+		}
+	}
+
+	/* Enable Shadow register sync on 32k clock boundary */
+	k3rtc_field_write(priv, K3RTC_O32K_OSC_DEP_EN, 0x1);
+
+	/*
+	 * Wait at least clock sync time before proceeding further programming.
+	 * This ensures that the 32k based sync is active.
+	 */
+	usleep_range(priv->sync_timeout_us, priv->sync_timeout_us + 5);
+
+	/* We need to ensure fence here to make sure sync here */
+	ret = k3rtc_fence(priv);
+	if (ret) {
+		dev_err(dev,
+			"Failed fence osc_dep enable(%d) - is 32k clk working?!\n", ret);
+		return ret;
+	}
+
+	/*
+	 * FMODE setting: Reading lower seconds will freeze value on higher
+	 * seconds. This also implies that we must *ALWAYS* read lower seconds
+	 * prior to reading higher seconds
+	 */
+	k3rtc_field_write(priv, K3RTC_CNT_FMODE, K3RTC_CNT_FMODE_S_CNT_VALUE);
+
+	/* Clear any spurious IRQ sources if any */
+	k3rtc_field_write(priv, K3RTC_IRQ_STATUS_ALT, 0x1);
+	k3rtc_field_write(priv, K3RTC_IRQ_STATUS, 0x1);
+	/* Disable all IRQs */
+	k3rtc_field_write(priv, K3RTC_IRQ_ENABLE_CLR_ALT, 0x1);
+	k3rtc_field_write(priv, K3RTC_IRQ_ENABLE_CLR, 0x1);
+
+	/* And.. Let us Sync the writes in */
+	return k3rtc_fence(priv);
+}
+
+static int ti_k3_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+	struct ti_k3_rtc *priv = dev_get_drvdata(dev);
+	u32 seconds_lo, seconds_hi;
+
+	seconds_lo = k3rtc_field_read(priv, K3RTC_S_CNT_LSW);
+	seconds_hi = k3rtc_field_read(priv, K3RTC_S_CNT_MSW);
+
+	rtc_time64_to_tm((((time64_t)seconds_hi) << 32) | (time64_t)seconds_lo, tm);
+
+	return 0;
+}
+
+static int ti_k3_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+	struct ti_k3_rtc *priv = dev_get_drvdata(dev);
+	time64_t seconds;
+
+	seconds = rtc_tm_to_time64(tm);
+
+	/*
+	 * Read operation on LSW will freeze the RTC, so to update
+	 * the time, we cannot use field operations. Just write since the
+	 * reserved bits are ignored.
+	 */
+	regmap_write(priv->regmap, REG_K3RTC_S_CNT_LSW, seconds);
+	regmap_write(priv->regmap, REG_K3RTC_S_CNT_MSW, seconds >> 32);
+
+	return k3rtc_fence(priv);
+}
+
+static int ti_k3_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
+{
+	struct ti_k3_rtc *priv = dev_get_drvdata(dev);
+	u32 reg;
+	u32 offset = enabled ? K3RTC_IRQ_ENABLE_SET : K3RTC_IRQ_ENABLE_CLR;
+
+	reg = k3rtc_field_read(priv, K3RTC_IRQ_ENABLE_SET);
+	if ((enabled && reg) || (!enabled && !reg))
+		return 0;
+
+	k3rtc_field_write(priv, offset, 0x1);
+
+	/*
+	 * Ensure the write sync is through - NOTE: it should be OK to have
+	 * ISR to fire as we are checking sync (which should be done in a 32k
+	 * cycle or so).
+	 */
+	return k3rtc_fence(priv);
+}
+
+static int ti_k3_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
+{
+	struct ti_k3_rtc *priv = dev_get_drvdata(dev);
+	u32 seconds_lo, seconds_hi;
+
+	seconds_lo = k3rtc_field_read(priv, K3RTC_ALM_S_CNT_LSW);
+	seconds_hi = k3rtc_field_read(priv, K3RTC_ALM_S_CNT_MSW);
+
+	rtc_time64_to_tm((((time64_t)seconds_hi) << 32) | (time64_t)seconds_lo, &alarm->time);
+
+	alarm->enabled = k3rtc_field_read(priv, K3RTC_IRQ_ENABLE_SET);
+
+	return 0;
+}
+
+static int ti_k3_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
+{
+	struct ti_k3_rtc *priv = dev_get_drvdata(dev);
+	time64_t seconds;
+	int ret;
+
+	seconds = rtc_tm_to_time64(&alarm->time);
+
+	k3rtc_field_write(priv, K3RTC_ALM_S_CNT_LSW, seconds);
+	k3rtc_field_write(priv, K3RTC_ALM_S_CNT_MSW, (seconds >> 32));
+
+	/* Make sure the alarm time is synced in */
+	ret = k3rtc_fence(priv);
+	if (ret) {
+		dev_err(dev, "Failed to fence(%d)! Potential config issue?\n", ret);
+		return ret;
+	}
+
+	/* Alarm IRQ enable will do a sync */
+	return ti_k3_rtc_alarm_irq_enable(dev, alarm->enabled);
+}
+
+static int ti_k3_rtc_read_offset(struct device *dev, long *offset)
+{
+	struct ti_k3_rtc *priv = dev_get_drvdata(dev);
+	u32 ticks_per_hr = priv->rate_32k * 3600;
+	int comp;
+	s64 tmp;
+
+	comp = k3rtc_field_read(priv, K3RTC_COMP);
+
+	/* Convert from RTC calibration register format to ppb format */
+	tmp = comp * (s64)K3RTC_PPB_MULT;
+	if (tmp < 0)
+		tmp -= ticks_per_hr / 2LL;
+	else
+		tmp += ticks_per_hr / 2LL;
+	tmp = div_s64(tmp, ticks_per_hr);
+
+	/* Offset value operates in negative way, so swap sign */
+	*offset = (long)-tmp;
+
+	return 0;
+}
+
+static int ti_k3_rtc_set_offset(struct device *dev, long offset)
+{
+	struct ti_k3_rtc *priv = dev_get_drvdata(dev);
+	u32 ticks_per_hr = priv->rate_32k * 3600;
+	int comp;
+	s64 tmp;
+
+	/* Make sure offset value is within supported range */
+	if (offset < K3RTC_MIN_OFFSET || offset > K3RTC_MAX_OFFSET)
+		return -ERANGE;
+
+	/* Convert from ppb format to RTC calibration register format */
+	tmp = offset * (s64)ticks_per_hr;
+	if (tmp < 0)
+		tmp -= K3RTC_PPB_MULT / 2LL;
+	else
+		tmp += K3RTC_PPB_MULT / 2LL;
+	tmp = div_s64(tmp, K3RTC_PPB_MULT);
+
+	/* Offset value operates in negative way, so swap sign */
+	comp = (int)-tmp;
+
+	k3rtc_field_write(priv, K3RTC_COMP, comp);
+
+	return k3rtc_fence(priv);
+}
+
+static irqreturn_t ti_k3_rtc_interrupt(s32 irq, void *dev_id)
+{
+	struct device *dev = dev_id;
+	struct ti_k3_rtc *priv = dev_get_drvdata(dev);
+	u32 reg;
+	int ret;
+
+	/*
+	 * IRQ assertion can be very fast, however, the IRQ Status clear
+	 * de-assert depends on 32k clock edge in the 32k domain
+	 * If we clear the status prior to the first 32k clock edge,
+	 * the status bit is cleared, but the IRQ stays re-asserted.
+	 *
+	 * To prevent this condition, we need to wait for clock sync time.
+	 * We can either do that by polling the 32k observability signal for
+	 * a toggle OR we could just sleep and let the processor do other
+	 * stuff.
+	 */
+	usleep_range(priv->sync_timeout_us, priv->sync_timeout_us + 2);
+
+	/* Lets make sure that this is a valid interrupt */
+	reg = k3rtc_field_read(priv, K3RTC_IRQ_STATUS);
+
+	if (!reg) {
+		u32 raw = k3rtc_field_read(priv, K3RTC_IRQ_STATUS_RAW);
+
+		dev_err(dev,
+			HW_ERR
+			"Erratum i2327/IRQ trig: status: 0x%08x / 0x%08x\n", reg, raw);
+		return IRQ_NONE;
+	}
+
+	/*
+	 * Write 1 to clear status reg
+	 * We cannot use a field operation here due to a potential race between
+	 * 32k domain and vbus domain.
+	 */
+	regmap_write(priv->regmap, REG_K3RTC_IRQSTATUS_SYS, 0x1);
+
+	/* Sync the write in */
+	ret = k3rtc_fence(priv);
+	if (ret) {
+		dev_err(dev, "Failed to fence irq status clr(%d)!\n", ret);
+		return IRQ_NONE;
+	}
+
+	/*
+	 * Force the 32k status to be reloaded back in to ensure status is
+	 * reflected back correctly.
+	 */
+	k3rtc_field_write(priv, K3RTC_RELOAD_FROM_BBD, 0x1);
+
+	/* Ensure the write sync is through */
+	ret = k3rtc_fence(priv);
+	if (ret) {
+		dev_err(dev, "Failed to fence reload from bbd(%d)!\n", ret);
+		return IRQ_NONE;
+	}
+
+	/* Now we ensure that the status bit is cleared */
+	ret = regmap_field_read_poll_timeout(priv->r_fields[K3RTC_IRQ_STATUS],
+					     ret, !ret, 2, priv->sync_timeout_us);
+	if (ret) {
+		dev_err(dev, "Time out waiting for status clear\n");
+		return IRQ_NONE;
+	}
+
+	/* Notify RTC core on event */
+	rtc_update_irq(priv->rtc_dev, 1, RTC_IRQF | RTC_AF);
+
+	return IRQ_HANDLED;
+}
+
+static const struct rtc_class_ops ti_k3_rtc_ops = {
+	.read_time = ti_k3_rtc_read_time,
+	.set_time = ti_k3_rtc_set_time,
+	.read_alarm = ti_k3_rtc_read_alarm,
+	.set_alarm = ti_k3_rtc_set_alarm,
+	.read_offset = ti_k3_rtc_read_offset,
+	.set_offset = ti_k3_rtc_set_offset,
+	.alarm_irq_enable = ti_k3_rtc_alarm_irq_enable,
+};
+
+static int ti_k3_rtc_scratch_read(void *priv_data, unsigned int offset,
+				  void *val, size_t bytes)
+{
+	struct ti_k3_rtc *priv = (struct ti_k3_rtc *)priv_data;
+
+	return regmap_bulk_read(priv->regmap, REG_K3RTC_SCRATCH0 + offset, val, bytes / 4);
+}
+
+static int ti_k3_rtc_scratch_write(void *priv_data, unsigned int offset,
+				   void *val, size_t bytes)
+{
+	struct ti_k3_rtc *priv = (struct ti_k3_rtc *)priv_data;
+	int ret;
+
+	ret = regmap_bulk_write(priv->regmap, REG_K3RTC_SCRATCH0 + offset, val, bytes / 4);
+	if (ret)
+		return ret;
+
+	return k3rtc_fence(priv);
+}
+
+static struct nvmem_config ti_k3_rtc_nvmem_config = {
+	.name = "ti_k3_rtc_scratch",
+	.word_size = 4,
+	.stride = 4,
+	.size = REG_K3RTC_SCRATCH7 - REG_K3RTC_SCRATCH0 + 4,
+	.reg_read = ti_k3_rtc_scratch_read,
+	.reg_write = ti_k3_rtc_scratch_write,
+};
+
+static int k3rtc_get_32kclk(struct device *dev, struct ti_k3_rtc *priv)
+{
+	struct clk *clk;
+
+	clk = devm_clk_get_enabled(dev, "osc32k");
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	priv->rate_32k = clk_get_rate(clk);
+
+	/* Make sure we are exact 32k clock. Else, try to compensate delay */
+	if (priv->rate_32k != 32768)
+		dev_warn(dev, "Clock rate %ld is not 32768! Could misbehave!\n",
+			 priv->rate_32k);
+
+	/*
+	 * Sync timeout should be two 32k clk sync cycles = ~61uS. We double
+	 * it to comprehend intermediate bus segment and cpu frequency
+	 * deltas
+	 */
+	priv->sync_timeout_us = (u32)(DIV_ROUND_UP_ULL(1000000, priv->rate_32k) * 4);
+
+	return 0;
+}
+
+static int k3rtc_get_vbusclk(struct device *dev, struct ti_k3_rtc *priv)
+{
+	struct clk *clk;
+
+	/* Note: VBUS isn't a context clock, it is needed for hardware operation */
+	clk = devm_clk_get_enabled(dev, "vbus");
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	return 0;
+}
+
+static int ti_k3_rtc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct ti_k3_rtc *priv;
+	void __iomem *rtc_base;
+	int ret;
+
+	priv = devm_kzalloc(dev, sizeof(struct ti_k3_rtc), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	rtc_base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(rtc_base))
+		return PTR_ERR(rtc_base);
+
+	priv->regmap = devm_regmap_init_mmio(dev, rtc_base, &ti_k3_rtc_regmap_config);
+	if (IS_ERR(priv->regmap))
+		return PTR_ERR(priv->regmap);
+
+	ret = devm_regmap_field_bulk_alloc(dev, priv->regmap, priv->r_fields,
+					   ti_rtc_reg_fields, K3_RTC_MAX_FIELDS);
+	if (ret)
+		return ret;
+
+	ret = k3rtc_get_32kclk(dev, priv);
+	if (ret)
+		return ret;
+	ret = k3rtc_get_vbusclk(dev, priv);
+	if (ret)
+		return ret;
+
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0)
+		return ret;
+	priv->irq = (unsigned int)ret;
+
+	priv->rtc_dev = devm_rtc_allocate_device(dev);
+	if (IS_ERR(priv->rtc_dev))
+		return PTR_ERR(priv->rtc_dev);
+
+	priv->rtc_dev->ops = &ti_k3_rtc_ops;
+	priv->rtc_dev->range_max = (1ULL << 48) - 1;	/* 48Bit seconds */
+	ti_k3_rtc_nvmem_config.priv = priv;
+
+	ret = devm_request_threaded_irq(dev, priv->irq, NULL,
+					ti_k3_rtc_interrupt,
+					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
+					dev_name(dev), dev);
+	if (ret) {
+		dev_err(dev, "Could not request IRQ: %d\n", ret);
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, priv);
+
+	ret = k3rtc_configure(dev);
+	if (ret)
+		return ret;
+
+	if (device_property_present(dev, "wakeup-source"))
+		device_init_wakeup(dev, true);
+	else
+		device_set_wakeup_capable(dev, true);
+
+	ret = devm_rtc_register_device(priv->rtc_dev);
+	if (ret)
+		return ret;
+
+	return devm_rtc_nvmem_register(priv->rtc_dev, &ti_k3_rtc_nvmem_config);
+}
+
+static const struct of_device_id ti_k3_rtc_of_match_table[] = {
+	{.compatible = "ti,am62-rtc" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, ti_k3_rtc_of_match_table);
+
+static int __maybe_unused ti_k3_rtc_suspend(struct device *dev)
+{
+	struct ti_k3_rtc *priv = dev_get_drvdata(dev);
+
+	if (device_may_wakeup(dev))
+		enable_irq_wake(priv->irq);
+	return 0;
+}
+
+static int __maybe_unused ti_k3_rtc_resume(struct device *dev)
+{
+	struct ti_k3_rtc *priv = dev_get_drvdata(dev);
+
+	if (device_may_wakeup(dev))
+		disable_irq_wake(priv->irq);
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(ti_k3_rtc_pm_ops, ti_k3_rtc_suspend, ti_k3_rtc_resume);
+
+static struct platform_driver ti_k3_rtc_driver = {
+	.probe = ti_k3_rtc_probe,
+	.driver = {
+		   .name = "rtc-ti-k3",
+		   .of_match_table = ti_k3_rtc_of_match_table,
+		   .pm = &ti_k3_rtc_pm_ops,
+	},
+};
+module_platform_driver(ti_k3_rtc_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("TI K3 RTC driver");
+MODULE_AUTHOR("Nishanth Menon");