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, 592 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-rx8025.c b/drivers/rtc/rtc-rx8025.c
new file mode 100644
index 000000000..331c20d4d
--- /dev/null
+++ b/drivers/rtc/rtc-rx8025.c
@@ -0,0 +1,592 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for Epson's RTC module RX-8025 SA/NB
+ *
+ * Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.com>
+ *
+ * Copyright (C) 2005 by Digi International Inc.
+ * All rights reserved.
+ *
+ * Modified by fengjh at rising.com.cn
+ * <lm-sensors@lm-sensors.org>
+ * 2006.11
+ *
+ * Code cleanup by Sergei Poselenov, <sposelenov@emcraft.com>
+ * Converted to new style by Wolfgang Grandegger <wg@grandegger.com>
+ * Alarm and periodic interrupt added by Dmitry Rakhchev <rda@emcraft.com>
+ */
+#include <linux/bcd.h>
+#include <linux/bitops.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/kstrtox.h>
+#include <linux/module.h>
+#include <linux/rtc.h>
+
+/* Register definitions */
+#define RX8025_REG_SEC		0x00
+#define RX8025_REG_MIN		0x01
+#define RX8025_REG_HOUR		0x02
+#define RX8025_REG_WDAY		0x03
+#define RX8025_REG_MDAY		0x04
+#define RX8025_REG_MONTH	0x05
+#define RX8025_REG_YEAR		0x06
+#define RX8025_REG_DIGOFF	0x07
+#define RX8025_REG_ALWMIN	0x08
+#define RX8025_REG_ALWHOUR	0x09
+#define RX8025_REG_ALWWDAY	0x0a
+#define RX8025_REG_ALDMIN	0x0b
+#define RX8025_REG_ALDHOUR	0x0c
+/* 0x0d is reserved */
+#define RX8025_REG_CTRL1	0x0e
+#define RX8025_REG_CTRL2	0x0f
+
+#define RX8025_BIT_CTRL1_CT	(7 << 0)
+/* 1 Hz periodic level irq */
+#define RX8025_BIT_CTRL1_CT_1HZ	4
+#define RX8025_BIT_CTRL1_TEST	BIT(3)
+#define RX8025_BIT_CTRL1_1224	BIT(5)
+#define RX8025_BIT_CTRL1_DALE	BIT(6)
+#define RX8025_BIT_CTRL1_WALE	BIT(7)
+
+#define RX8025_BIT_CTRL2_DAFG	BIT(0)
+#define RX8025_BIT_CTRL2_WAFG	BIT(1)
+#define RX8025_BIT_CTRL2_CTFG	BIT(2)
+#define RX8025_BIT_CTRL2_PON	BIT(4)
+#define RX8025_BIT_CTRL2_XST	BIT(5)
+#define RX8025_BIT_CTRL2_VDET	BIT(6)
+
+#define RX8035_BIT_HOUR_1224	BIT(7)
+
+/* Clock precision adjustment */
+#define RX8025_ADJ_RESOLUTION	3050 /* in ppb */
+#define RX8025_ADJ_DATA_MAX	62
+#define RX8025_ADJ_DATA_MIN	-62
+
+enum rx_model {
+	model_rx_unknown,
+	model_rx_8025,
+	model_rx_8035,
+	model_last
+};
+
+static const struct i2c_device_id rx8025_id[] = {
+	{ "rx8025", model_rx_8025 },
+	{ "rx8035", model_rx_8035 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, rx8025_id);
+
+struct rx8025_data {
+	struct rtc_device *rtc;
+	enum rx_model model;
+	u8 ctrl1;
+	int is_24;
+};
+
+static s32 rx8025_read_reg(const struct i2c_client *client, u8 number)
+{
+	return i2c_smbus_read_byte_data(client, number << 4);
+}
+
+static int rx8025_read_regs(const struct i2c_client *client,
+			    u8 number, u8 length, u8 *values)
+{
+	int ret = i2c_smbus_read_i2c_block_data(client, number << 4, length,
+						values);
+	if (ret != length)
+		return ret < 0 ? ret : -EIO;
+
+	return 0;
+}
+
+static s32 rx8025_write_reg(const struct i2c_client *client, u8 number,
+			    u8 value)
+{
+	return i2c_smbus_write_byte_data(client, number << 4, value);
+}
+
+static s32 rx8025_write_regs(const struct i2c_client *client,
+			     u8 number, u8 length, const u8 *values)
+{
+	return i2c_smbus_write_i2c_block_data(client, number << 4,
+					      length, values);
+}
+
+static int rx8025_is_osc_stopped(enum rx_model model, int ctrl2)
+{
+	int xstp = ctrl2 & RX8025_BIT_CTRL2_XST;
+	/* XSTP bit has different polarity on RX-8025 vs RX-8035.
+	 * RX-8025: 0 == oscillator stopped
+	 * RX-8035: 1 == oscillator stopped
+	 */
+
+	if (model == model_rx_8025)
+		xstp = !xstp;
+
+	return xstp;
+}
+
+static int rx8025_check_validity(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct rx8025_data *drvdata = dev_get_drvdata(dev);
+	int ctrl2;
+	int xstp;
+
+	ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2);
+	if (ctrl2 < 0)
+		return ctrl2;
+
+	if (ctrl2 & RX8025_BIT_CTRL2_VDET)
+		dev_warn(dev, "power voltage drop detected\n");
+
+	if (ctrl2 & RX8025_BIT_CTRL2_PON) {
+		dev_warn(dev, "power-on reset detected, date is invalid\n");
+		return -EINVAL;
+	}
+
+	xstp = rx8025_is_osc_stopped(drvdata->model, ctrl2);
+	if (xstp) {
+		dev_warn(dev, "crystal stopped, date is invalid\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int rx8025_reset_validity(struct i2c_client *client)
+{
+	struct rx8025_data *drvdata = i2c_get_clientdata(client);
+	int ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2);
+
+	if (ctrl2 < 0)
+		return ctrl2;
+
+	ctrl2 &= ~(RX8025_BIT_CTRL2_PON | RX8025_BIT_CTRL2_VDET);
+
+	if (drvdata->model == model_rx_8025)
+		ctrl2 |= RX8025_BIT_CTRL2_XST;
+	else
+		ctrl2 &= ~(RX8025_BIT_CTRL2_XST);
+
+	return rx8025_write_reg(client, RX8025_REG_CTRL2,
+				ctrl2);
+}
+
+static irqreturn_t rx8025_handle_irq(int irq, void *dev_id)
+{
+	struct i2c_client *client = dev_id;
+	struct rx8025_data *rx8025 = i2c_get_clientdata(client);
+	int status, xstp;
+
+	rtc_lock(rx8025->rtc);
+	status = rx8025_read_reg(client, RX8025_REG_CTRL2);
+	if (status < 0)
+		goto out;
+
+	xstp = rx8025_is_osc_stopped(rx8025->model, status);
+	if (xstp)
+		dev_warn(&client->dev, "Oscillation stop was detected,"
+			 "you may have to readjust the clock\n");
+
+	if (status & RX8025_BIT_CTRL2_CTFG) {
+		/* periodic */
+		status &= ~RX8025_BIT_CTRL2_CTFG;
+		rtc_update_irq(rx8025->rtc, 1, RTC_PF | RTC_IRQF);
+	}
+
+	if (status & RX8025_BIT_CTRL2_DAFG) {
+		/* alarm */
+		status &= RX8025_BIT_CTRL2_DAFG;
+		if (rx8025_write_reg(client, RX8025_REG_CTRL1,
+				     rx8025->ctrl1 & ~RX8025_BIT_CTRL1_DALE))
+			goto out;
+		rtc_update_irq(rx8025->rtc, 1, RTC_AF | RTC_IRQF);
+	}
+
+out:
+	rtc_unlock(rx8025->rtc);
+
+	return IRQ_HANDLED;
+}
+
+static int rx8025_get_time(struct device *dev, struct rtc_time *dt)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct rx8025_data *rx8025 = dev_get_drvdata(dev);
+	u8 date[7];
+	int err;
+
+	err = rx8025_check_validity(dev);
+	if (err)
+		return err;
+
+	err = rx8025_read_regs(client, RX8025_REG_SEC, 7, date);
+	if (err)
+		return err;
+
+	dev_dbg(dev, "%s: read %7ph\n", __func__, date);
+
+	dt->tm_sec = bcd2bin(date[RX8025_REG_SEC] & 0x7f);
+	dt->tm_min = bcd2bin(date[RX8025_REG_MIN] & 0x7f);
+	if (rx8025->is_24)
+		dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x3f);
+	else
+		dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x1f) % 12
+			+ (date[RX8025_REG_HOUR] & 0x20 ? 12 : 0);
+
+	dt->tm_mday = bcd2bin(date[RX8025_REG_MDAY] & 0x3f);
+	dt->tm_mon = bcd2bin(date[RX8025_REG_MONTH] & 0x1f) - 1;
+	dt->tm_year = bcd2bin(date[RX8025_REG_YEAR]) + 100;
+
+	dev_dbg(dev, "%s: date %ptRr\n", __func__, dt);
+
+	return 0;
+}
+
+static int rx8025_set_time(struct device *dev, struct rtc_time *dt)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct rx8025_data *rx8025 = dev_get_drvdata(dev);
+	u8 date[7];
+	int ret;
+
+	/*
+	 * Here the read-only bits are written as "0".  I'm not sure if that
+	 * is sound.
+	 */
+	date[RX8025_REG_SEC] = bin2bcd(dt->tm_sec);
+	date[RX8025_REG_MIN] = bin2bcd(dt->tm_min);
+	if (rx8025->is_24)
+		date[RX8025_REG_HOUR] = bin2bcd(dt->tm_hour);
+	else
+		date[RX8025_REG_HOUR] = (dt->tm_hour >= 12 ? 0x20 : 0)
+			| bin2bcd((dt->tm_hour + 11) % 12 + 1);
+
+	date[RX8025_REG_WDAY] = bin2bcd(dt->tm_wday);
+	date[RX8025_REG_MDAY] = bin2bcd(dt->tm_mday);
+	date[RX8025_REG_MONTH] = bin2bcd(dt->tm_mon + 1);
+	date[RX8025_REG_YEAR] = bin2bcd(dt->tm_year - 100);
+
+	dev_dbg(dev, "%s: write %7ph\n", __func__, date);
+
+	ret = rx8025_write_regs(client, RX8025_REG_SEC, 7, date);
+	if (ret < 0)
+		return ret;
+
+	return rx8025_reset_validity(client);
+}
+
+static int rx8025_init_client(struct i2c_client *client)
+{
+	struct rx8025_data *rx8025 = i2c_get_clientdata(client);
+	u8 ctrl[2], ctrl2;
+	int need_clear = 0;
+	int hour_reg;
+	int err;
+
+	err = rx8025_read_regs(client, RX8025_REG_CTRL1, 2, ctrl);
+	if (err)
+		goto out;
+
+	/* Keep test bit zero ! */
+	rx8025->ctrl1 = ctrl[0] & ~RX8025_BIT_CTRL1_TEST;
+
+	if (ctrl[1] & (RX8025_BIT_CTRL2_DAFG | RX8025_BIT_CTRL2_WAFG)) {
+		dev_warn(&client->dev, "Alarm was detected\n");
+		need_clear = 1;
+	}
+
+	if (ctrl[1] & RX8025_BIT_CTRL2_CTFG)
+		need_clear = 1;
+
+	if (need_clear) {
+		ctrl2 = ctrl[1];
+		ctrl2 &= ~(RX8025_BIT_CTRL2_CTFG | RX8025_BIT_CTRL2_WAFG |
+			   RX8025_BIT_CTRL2_DAFG);
+
+		err = rx8025_write_reg(client, RX8025_REG_CTRL2, ctrl2);
+	}
+
+	if (rx8025->model == model_rx_8035) {
+		/* In RX-8035, 12/24 flag is in the hour register */
+		hour_reg = rx8025_read_reg(client, RX8025_REG_HOUR);
+		if (hour_reg < 0)
+			return hour_reg;
+		rx8025->is_24 = (hour_reg & RX8035_BIT_HOUR_1224);
+	} else {
+		rx8025->is_24 = (ctrl[1] & RX8025_BIT_CTRL1_1224);
+	}
+out:
+	return err;
+}
+
+/* Alarm support */
+static int rx8025_read_alarm(struct device *dev, struct rtc_wkalrm *t)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct rx8025_data *rx8025 = dev_get_drvdata(dev);
+	u8 ald[2];
+	int ctrl2, err;
+
+	err = rx8025_read_regs(client, RX8025_REG_ALDMIN, 2, ald);
+	if (err)
+		return err;
+
+	ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2);
+	if (ctrl2 < 0)
+		return ctrl2;
+
+	dev_dbg(dev, "%s: read alarm 0x%02x 0x%02x ctrl2 %02x\n",
+		__func__, ald[0], ald[1], ctrl2);
+
+	/* Hardware alarms precision is 1 minute! */
+	t->time.tm_sec = 0;
+	t->time.tm_min = bcd2bin(ald[0] & 0x7f);
+	if (rx8025->is_24)
+		t->time.tm_hour = bcd2bin(ald[1] & 0x3f);
+	else
+		t->time.tm_hour = bcd2bin(ald[1] & 0x1f) % 12
+			+ (ald[1] & 0x20 ? 12 : 0);
+
+	dev_dbg(dev, "%s: date: %ptRr\n", __func__, &t->time);
+	t->enabled = !!(rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE);
+	t->pending = (ctrl2 & RX8025_BIT_CTRL2_DAFG) && t->enabled;
+
+	return err;
+}
+
+static int rx8025_set_alarm(struct device *dev, struct rtc_wkalrm *t)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct rx8025_data *rx8025 = dev_get_drvdata(dev);
+	u8 ald[2];
+	int err;
+
+	ald[0] = bin2bcd(t->time.tm_min);
+	if (rx8025->is_24)
+		ald[1] = bin2bcd(t->time.tm_hour);
+	else
+		ald[1] = (t->time.tm_hour >= 12 ? 0x20 : 0)
+			| bin2bcd((t->time.tm_hour + 11) % 12 + 1);
+
+	dev_dbg(dev, "%s: write 0x%02x 0x%02x\n", __func__, ald[0], ald[1]);
+
+	if (rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE) {
+		rx8025->ctrl1 &= ~RX8025_BIT_CTRL1_DALE;
+		err = rx8025_write_reg(client, RX8025_REG_CTRL1,
+				       rx8025->ctrl1);
+		if (err)
+			return err;
+	}
+	err = rx8025_write_regs(client, RX8025_REG_ALDMIN, 2, ald);
+	if (err)
+		return err;
+
+	if (t->enabled) {
+		rx8025->ctrl1 |= RX8025_BIT_CTRL1_DALE;
+		err = rx8025_write_reg(client, RX8025_REG_CTRL1,
+				       rx8025->ctrl1);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
+static int rx8025_alarm_irq_enable(struct device *dev, unsigned int enabled)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct rx8025_data *rx8025 = dev_get_drvdata(dev);
+	u8 ctrl1;
+	int err;
+
+	ctrl1 = rx8025->ctrl1;
+	if (enabled)
+		ctrl1 |= RX8025_BIT_CTRL1_DALE;
+	else
+		ctrl1 &= ~RX8025_BIT_CTRL1_DALE;
+
+	if (ctrl1 != rx8025->ctrl1) {
+		rx8025->ctrl1 = ctrl1;
+		err = rx8025_write_reg(client, RX8025_REG_CTRL1,
+				       rx8025->ctrl1);
+		if (err)
+			return err;
+	}
+	return 0;
+}
+
+/*
+ * According to the RX8025 SA/NB application manual the frequency and
+ * temperature characteristics can be approximated using the following
+ * equation:
+ *
+ *   df = a * (ut - t)**2
+ *
+ *   df: Frequency deviation in any temperature
+ *   a : Coefficient = (-35 +-5) * 10**-9
+ *   ut: Ultimate temperature in degree = +25 +-5 degree
+ *   t : Any temperature in degree
+ */
+static int rx8025_read_offset(struct device *dev, long *offset)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	int digoff;
+
+	digoff = rx8025_read_reg(client, RX8025_REG_DIGOFF);
+	if (digoff < 0)
+		return digoff;
+
+	*offset = digoff >= 64 ? digoff - 128 : digoff;
+	if (*offset > 0)
+		(*offset)--;
+	*offset *= RX8025_ADJ_RESOLUTION;
+
+	return 0;
+}
+
+static int rx8025_set_offset(struct device *dev, long offset)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	u8 digoff;
+
+	offset /= RX8025_ADJ_RESOLUTION;
+	if (offset > RX8025_ADJ_DATA_MAX)
+		offset = RX8025_ADJ_DATA_MAX;
+	else if (offset < RX8025_ADJ_DATA_MIN)
+		offset = RX8025_ADJ_DATA_MIN;
+	else if (offset > 0)
+		offset++;
+	else if (offset < 0)
+		offset += 128;
+	digoff = offset;
+
+	return rx8025_write_reg(client, RX8025_REG_DIGOFF, digoff);
+}
+
+static const struct rtc_class_ops rx8025_rtc_ops = {
+	.read_time = rx8025_get_time,
+	.set_time = rx8025_set_time,
+	.read_alarm = rx8025_read_alarm,
+	.set_alarm = rx8025_set_alarm,
+	.alarm_irq_enable = rx8025_alarm_irq_enable,
+	.read_offset = rx8025_read_offset,
+	.set_offset = rx8025_set_offset,
+};
+
+static ssize_t rx8025_sysfs_show_clock_adjust(struct device *dev,
+					      struct device_attribute *attr,
+					      char *buf)
+{
+	long adj;
+	int err;
+
+	dev_warn_once(dev, "clock_adjust_ppb is deprecated, use offset\n");
+	err = rx8025_read_offset(dev, &adj);
+	if (err)
+		return err;
+
+	return sprintf(buf, "%ld\n", -adj);
+}
+
+static ssize_t rx8025_sysfs_store_clock_adjust(struct device *dev,
+					       struct device_attribute *attr,
+					       const char *buf, size_t count)
+{
+	long adj;
+	int err;
+
+	dev_warn_once(dev, "clock_adjust_ppb is deprecated, use offset\n");
+	if (kstrtol(buf, 10, &adj) != 0)
+		return -EINVAL;
+
+	err = rx8025_set_offset(dev, -adj);
+
+	return err ? err : count;
+}
+
+static DEVICE_ATTR(clock_adjust_ppb, S_IRUGO | S_IWUSR,
+		   rx8025_sysfs_show_clock_adjust,
+		   rx8025_sysfs_store_clock_adjust);
+
+static struct attribute *rx8025_attrs[] = {
+	&dev_attr_clock_adjust_ppb.attr,
+	NULL
+};
+
+static const struct attribute_group rx8025_attr_group = {
+	.attrs	= rx8025_attrs,
+};
+
+static int rx8025_probe(struct i2c_client *client)
+{
+	const struct i2c_device_id *id = i2c_match_id(rx8025_id, client);
+	struct i2c_adapter *adapter = client->adapter;
+	struct rx8025_data *rx8025;
+	int err = 0;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
+				     | I2C_FUNC_SMBUS_I2C_BLOCK)) {
+		dev_err(&adapter->dev,
+			"doesn't support required functionality\n");
+		return -EIO;
+	}
+
+	rx8025 = devm_kzalloc(&client->dev, sizeof(*rx8025), GFP_KERNEL);
+	if (!rx8025)
+		return -ENOMEM;
+
+	i2c_set_clientdata(client, rx8025);
+
+	if (id)
+		rx8025->model = id->driver_data;
+
+	err = rx8025_init_client(client);
+	if (err)
+		return err;
+
+	rx8025->rtc = devm_rtc_allocate_device(&client->dev);
+	if (IS_ERR(rx8025->rtc))
+		return PTR_ERR(rx8025->rtc);
+
+	rx8025->rtc->ops = &rx8025_rtc_ops;
+	rx8025->rtc->range_min = RTC_TIMESTAMP_BEGIN_1900;
+	rx8025->rtc->range_max = RTC_TIMESTAMP_END_2099;
+
+	if (client->irq > 0) {
+		dev_info(&client->dev, "IRQ %d supplied\n", client->irq);
+		err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
+						rx8025_handle_irq,
+						IRQF_ONESHOT,
+						"rx8025", client);
+		if (err)
+			clear_bit(RTC_FEATURE_ALARM, rx8025->rtc->features);
+	}
+
+	rx8025->rtc->max_user_freq = 1;
+
+	set_bit(RTC_FEATURE_ALARM_RES_MINUTE, rx8025->rtc->features);
+	clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, rx8025->rtc->features);
+
+	err = rtc_add_group(rx8025->rtc, &rx8025_attr_group);
+	if (err)
+		return err;
+
+	return devm_rtc_register_device(rx8025->rtc);
+}
+
+static struct i2c_driver rx8025_driver = {
+	.driver = {
+		.name = "rtc-rx8025",
+	},
+	.probe_new	= rx8025_probe,
+	.id_table	= rx8025_id,
+};
+
+module_i2c_driver(rx8025_driver);
+
+MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
+MODULE_DESCRIPTION("RX-8025 SA/NB RTC driver");
+MODULE_LICENSE("GPL");