Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 738 insertions, 0 deletions

diff --git a/drivers/mfd/max77759.c b/drivers/mfd/max77759.c
new file mode 100644
index 000000000..72b608a1a
--- /dev/null
+++ b/drivers/mfd/max77759.c
@@ -0,0 +1,738 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2020 Google Inc
+ * Copyright 2025 Linaro Ltd.
+ *
+ * Core driver for Maxim MAX77759 companion PMIC for USB Type-C
+ */
+
+#include <linux/array_size.h>
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/cleanup.h>
+#include <linux/completion.h>
+#include <linux/dev_printk.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/jiffies.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/max77759.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/overflow.h>
+#include <linux/regmap.h>
+
+/* Chip ID as per MAX77759_PMIC_REG_PMIC_ID */
+enum {
+	MAX77759_CHIP_ID = 59,
+};
+
+enum max77759_i2c_subdev_id {
+	/*
+	 * These are arbitrary and simply used to match struct
+	 * max77759_i2c_subdev entries to the regmap pointers in struct
+	 * max77759 during probe().
+	 */
+	MAX77759_I2C_SUBDEV_ID_MAXQ,
+	MAX77759_I2C_SUBDEV_ID_CHARGER,
+};
+
+struct max77759_i2c_subdev {
+	enum max77759_i2c_subdev_id id;
+	const struct regmap_config *cfg;
+	u16 i2c_address;
+};
+
+static const struct regmap_range max77759_top_registers[] = {
+	regmap_reg_range(0x00, 0x02), /* PMIC_ID / PMIC_REVISION / OTP_REVISION */
+	regmap_reg_range(0x22, 0x24), /* INTSRC / INTSRCMASK / TOPSYS_INT */
+	regmap_reg_range(0x26, 0x26), /* TOPSYS_INT_MASK */
+	regmap_reg_range(0x40, 0x40), /* I2C_CNFG */
+	regmap_reg_range(0x50, 0x51), /* SWRESET / CONTROL_FG */
+};
+
+static const struct regmap_range max77759_top_ro_registers[] = {
+	regmap_reg_range(0x00, 0x02),
+	regmap_reg_range(0x22, 0x22),
+};
+
+static const struct regmap_range max77759_top_volatile_registers[] = {
+	regmap_reg_range(0x22, 0x22),
+	regmap_reg_range(0x24, 0x24),
+};
+
+static const struct regmap_access_table max77759_top_wr_table = {
+	.yes_ranges = max77759_top_registers,
+	.n_yes_ranges = ARRAY_SIZE(max77759_top_registers),
+	.no_ranges = max77759_top_ro_registers,
+	.n_no_ranges = ARRAY_SIZE(max77759_top_ro_registers),
+};
+
+static const struct regmap_access_table max77759_top_rd_table = {
+	.yes_ranges = max77759_top_registers,
+	.n_yes_ranges = ARRAY_SIZE(max77759_top_registers),
+};
+
+static const struct regmap_access_table max77759_top_volatile_table = {
+	.yes_ranges = max77759_top_volatile_registers,
+	.n_yes_ranges = ARRAY_SIZE(max77759_top_volatile_registers),
+};
+
+static const struct regmap_config max77759_regmap_config_top = {
+	.name = "top",
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = MAX77759_PMIC_REG_CONTROL_FG,
+	.wr_table = &max77759_top_wr_table,
+	.rd_table = &max77759_top_rd_table,
+	.volatile_table = &max77759_top_volatile_table,
+	.num_reg_defaults_raw = MAX77759_PMIC_REG_CONTROL_FG + 1,
+	.cache_type = REGCACHE_FLAT,
+};
+
+static const struct regmap_range max77759_maxq_registers[] = {
+	regmap_reg_range(0x60, 0x73), /* Device ID, Rev, INTx, STATUSx, MASKx */
+	regmap_reg_range(0x81, 0xa1), /* AP_DATAOUTx */
+	regmap_reg_range(0xb1, 0xd1), /* AP_DATAINx */
+	regmap_reg_range(0xe0, 0xe0), /* UIC_SWRST */
+};
+
+static const struct regmap_range max77759_maxq_ro_registers[] = {
+	regmap_reg_range(0x60, 0x63), /* Device ID, Rev */
+	regmap_reg_range(0x68, 0x6f), /* STATUSx */
+	regmap_reg_range(0xb1, 0xd1),
+};
+
+static const struct regmap_range max77759_maxq_volatile_registers[] = {
+	regmap_reg_range(0x64, 0x6f), /* INTx, STATUSx */
+	regmap_reg_range(0xb1, 0xd1),
+	regmap_reg_range(0xe0, 0xe0),
+};
+
+static const struct regmap_access_table max77759_maxq_wr_table = {
+	.yes_ranges = max77759_maxq_registers,
+	.n_yes_ranges = ARRAY_SIZE(max77759_maxq_registers),
+	.no_ranges = max77759_maxq_ro_registers,
+	.n_no_ranges = ARRAY_SIZE(max77759_maxq_ro_registers),
+};
+
+static const struct regmap_access_table max77759_maxq_rd_table = {
+	.yes_ranges = max77759_maxq_registers,
+	.n_yes_ranges = ARRAY_SIZE(max77759_maxq_registers),
+};
+
+static const struct regmap_access_table max77759_maxq_volatile_table = {
+	.yes_ranges = max77759_maxq_volatile_registers,
+	.n_yes_ranges = ARRAY_SIZE(max77759_maxq_volatile_registers),
+};
+
+static const struct regmap_config max77759_regmap_config_maxq = {
+	.name = "maxq",
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = MAX77759_MAXQ_REG_UIC_SWRST,
+	.wr_table = &max77759_maxq_wr_table,
+	.rd_table = &max77759_maxq_rd_table,
+	.volatile_table = &max77759_maxq_volatile_table,
+	.num_reg_defaults_raw = MAX77759_MAXQ_REG_UIC_SWRST + 1,
+	.cache_type = REGCACHE_FLAT,
+};
+
+static const struct regmap_range max77759_charger_registers[] = {
+	regmap_reg_range(0xb0, 0xcc),
+};
+
+static const struct regmap_range max77759_charger_ro_registers[] = {
+	regmap_reg_range(0xb4, 0xb8), /* INT_OK, DETAILS_0x */
+};
+
+static const struct regmap_range max77759_charger_volatile_registers[] = {
+	regmap_reg_range(0xb0, 0xb1), /* INTx */
+	regmap_reg_range(0xb4, 0xb8),
+};
+
+static const struct regmap_access_table max77759_charger_wr_table = {
+	.yes_ranges = max77759_charger_registers,
+	.n_yes_ranges = ARRAY_SIZE(max77759_charger_registers),
+	.no_ranges = max77759_charger_ro_registers,
+	.n_no_ranges = ARRAY_SIZE(max77759_charger_ro_registers),
+};
+
+static const struct regmap_access_table max77759_charger_rd_table = {
+	.yes_ranges = max77759_charger_registers,
+	.n_yes_ranges = ARRAY_SIZE(max77759_charger_registers),
+};
+
+static const struct regmap_access_table max77759_charger_volatile_table = {
+	.yes_ranges = max77759_charger_volatile_registers,
+	.n_yes_ranges = ARRAY_SIZE(max77759_charger_volatile_registers),
+};
+
+static const struct regmap_config max77759_regmap_config_charger = {
+	.name = "charger",
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = MAX77759_CHGR_REG_CHG_CNFG_19,
+	.wr_table = &max77759_charger_wr_table,
+	.rd_table = &max77759_charger_rd_table,
+	.volatile_table = &max77759_charger_volatile_table,
+	.num_reg_defaults_raw = MAX77759_CHGR_REG_CHG_CNFG_19 + 1,
+	.cache_type = REGCACHE_FLAT,
+};
+
+/*
+ * Interrupts - with the following interrupt hierarchy:
+ *   pmic IRQs (INTSRC)
+ *     - MAXQ_INT: MaxQ IRQs
+ *       - UIC_INT1
+ *         - APCmdResI
+ *         - SysMsgI
+ *         - GPIOxI
+ *     - TOPSYS_INT: topsys
+ *       - TOPSYS_INT
+ *         - TSHDN_INT
+ *         - SYSOVLO_INT
+ *         - SYSUVLO_INT
+ *         - FSHIP_NOT_RD
+ *     - CHGR_INT: charger
+ *       - INT1
+ *         - AICL
+ *         - CHGIN
+ *         - WCIN
+ *         - CHG
+ *         - BAT
+ *         - INLIM
+ *         - THM2
+ *         - BYP
+ *       - INT2
+ *         - INSEL
+ *         - SYS_UVLO1
+ *         - SYS_UVLO2
+ *         - BAT_OILO
+ *         - CHG_STA_CC
+ *         - CHG_STA_CV
+ *         - CHG_STA_TO
+ *         - CHG_STA_DONE
+ */
+enum {
+	MAX77759_INT_MAXQ,
+	MAX77759_INT_TOPSYS,
+	MAX77759_INT_CHGR,
+};
+
+enum {
+	MAX77759_TOPSYS_INT_TSHDN,
+	MAX77759_TOPSYS_INT_SYSOVLO,
+	MAX77759_TOPSYS_INT_SYSUVLO,
+	MAX77759_TOPSYS_INT_FSHIP_NOT_RD,
+};
+
+enum {
+	MAX77759_MAXQ_INT_APCMDRESI,
+	MAX77759_MAXQ_INT_SYSMSGI,
+	MAX77759_MAXQ_INT_GPIO,
+	MAX77759_MAXQ_INT_UIC1,
+	MAX77759_MAXQ_INT_UIC2,
+	MAX77759_MAXQ_INT_UIC3,
+	MAX77759_MAXQ_INT_UIC4,
+};
+
+enum {
+	MAX77759_CHGR_INT1_AICL,
+	MAX77759_CHGR_INT1_CHGIN,
+	MAX77759_CHGR_INT1_WCIN,
+	MAX77759_CHGR_INT1_CHG,
+	MAX77759_CHGR_INT1_BAT,
+	MAX77759_CHGR_INT1_INLIM,
+	MAX77759_CHGR_INT1_THM2,
+	MAX77759_CHGR_INT1_BYP,
+	MAX77759_CHGR_INT2_INSEL,
+	MAX77759_CHGR_INT2_SYS_UVLO1,
+	MAX77759_CHGR_INT2_SYS_UVLO2,
+	MAX77759_CHGR_INT2_BAT_OILO,
+	MAX77759_CHGR_INT2_CHG_STA_CC,
+	MAX77759_CHGR_INT2_CHG_STA_CV,
+	MAX77759_CHGR_INT2_CHG_STA_TO,
+	MAX77759_CHGR_INT2_CHG_STA_DONE,
+};
+
+static const struct regmap_irq max77759_pmic_irqs[] = {
+	REGMAP_IRQ_REG(MAX77759_INT_MAXQ, 0, MAX77759_PMIC_REG_INTSRC_MAXQ),
+	REGMAP_IRQ_REG(MAX77759_INT_TOPSYS, 0, MAX77759_PMIC_REG_INTSRC_TOPSYS),
+	REGMAP_IRQ_REG(MAX77759_INT_CHGR, 0, MAX77759_PMIC_REG_INTSRC_CHGR),
+};
+
+static const struct regmap_irq max77759_maxq_irqs[] = {
+	REGMAP_IRQ_REG(MAX77759_MAXQ_INT_APCMDRESI, 0, MAX77759_MAXQ_REG_UIC_INT1_APCMDRESI),
+	REGMAP_IRQ_REG(MAX77759_MAXQ_INT_SYSMSGI, 0, MAX77759_MAXQ_REG_UIC_INT1_SYSMSGI),
+	REGMAP_IRQ_REG(MAX77759_MAXQ_INT_GPIO, 0, GENMASK(1, 0)),
+	REGMAP_IRQ_REG(MAX77759_MAXQ_INT_UIC1, 0, GENMASK(5, 2)),
+	REGMAP_IRQ_REG(MAX77759_MAXQ_INT_UIC2, 1, GENMASK(7, 0)),
+	REGMAP_IRQ_REG(MAX77759_MAXQ_INT_UIC3, 2, GENMASK(7, 0)),
+	REGMAP_IRQ_REG(MAX77759_MAXQ_INT_UIC4, 3, GENMASK(7, 0)),
+};
+
+static const struct regmap_irq max77759_topsys_irqs[] = {
+	REGMAP_IRQ_REG(MAX77759_TOPSYS_INT_TSHDN, 0, MAX77759_PMIC_REG_TOPSYS_INT_TSHDN),
+	REGMAP_IRQ_REG(MAX77759_TOPSYS_INT_SYSOVLO, 0, MAX77759_PMIC_REG_TOPSYS_INT_SYSOVLO),
+	REGMAP_IRQ_REG(MAX77759_TOPSYS_INT_SYSUVLO, 0, MAX77759_PMIC_REG_TOPSYS_INT_SYSUVLO),
+	REGMAP_IRQ_REG(MAX77759_TOPSYS_INT_FSHIP_NOT_RD, 0, MAX77759_PMIC_REG_TOPSYS_INT_FSHIP),
+};
+
+static const struct regmap_irq max77759_chgr_irqs[] = {
+	REGMAP_IRQ_REG(MAX77759_CHGR_INT1_AICL, 0, MAX77759_CHGR_REG_CHG_INT_AICL),
+	REGMAP_IRQ_REG(MAX77759_CHGR_INT1_CHGIN, 0, MAX77759_CHGR_REG_CHG_INT_CHGIN),
+	REGMAP_IRQ_REG(MAX77759_CHGR_INT1_WCIN, 0, MAX77759_CHGR_REG_CHG_INT_WCIN),
+	REGMAP_IRQ_REG(MAX77759_CHGR_INT1_CHG, 0, MAX77759_CHGR_REG_CHG_INT_CHG),
+	REGMAP_IRQ_REG(MAX77759_CHGR_INT1_BAT, 0, MAX77759_CHGR_REG_CHG_INT_BAT),
+	REGMAP_IRQ_REG(MAX77759_CHGR_INT1_INLIM, 0, MAX77759_CHGR_REG_CHG_INT_INLIM),
+	REGMAP_IRQ_REG(MAX77759_CHGR_INT1_THM2, 0, MAX77759_CHGR_REG_CHG_INT_THM2),
+	REGMAP_IRQ_REG(MAX77759_CHGR_INT1_BYP, 0, MAX77759_CHGR_REG_CHG_INT_BYP),
+	REGMAP_IRQ_REG(MAX77759_CHGR_INT2_INSEL, 1, MAX77759_CHGR_REG_CHG_INT2_INSEL),
+	REGMAP_IRQ_REG(MAX77759_CHGR_INT2_SYS_UVLO1, 1, MAX77759_CHGR_REG_CHG_INT2_SYS_UVLO1),
+	REGMAP_IRQ_REG(MAX77759_CHGR_INT2_SYS_UVLO2, 1, MAX77759_CHGR_REG_CHG_INT2_SYS_UVLO2),
+	REGMAP_IRQ_REG(MAX77759_CHGR_INT2_BAT_OILO, 1, MAX77759_CHGR_REG_CHG_INT2_BAT_OILO),
+	REGMAP_IRQ_REG(MAX77759_CHGR_INT2_CHG_STA_CC, 1, MAX77759_CHGR_REG_CHG_INT2_CHG_STA_CC),
+	REGMAP_IRQ_REG(MAX77759_CHGR_INT2_CHG_STA_CV, 1, MAX77759_CHGR_REG_CHG_INT2_CHG_STA_CV),
+	REGMAP_IRQ_REG(MAX77759_CHGR_INT2_CHG_STA_TO, 1, MAX77759_CHGR_REG_CHG_INT2_CHG_STA_TO),
+	REGMAP_IRQ_REG(MAX77759_CHGR_INT2_CHG_STA_DONE, 1, MAX77759_CHGR_REG_CHG_INT2_CHG_STA_DONE),
+};
+
+static const struct regmap_irq_chip max77759_pmic_irq_chip = {
+	.name = "max77759-pmic",
+	/* INTSRC is read-only and doesn't require clearing */
+	.status_base = MAX77759_PMIC_REG_INTSRC,
+	.mask_base = MAX77759_PMIC_REG_INTSRCMASK,
+	.num_regs = 1,
+	.irqs = max77759_pmic_irqs,
+	.num_irqs = ARRAY_SIZE(max77759_pmic_irqs),
+};
+
+/*
+ * We can let regmap-irq auto-ack the topsys interrupt bits as required, but
+ * for all others the individual drivers need to know which interrupt bit
+ * exactly is set inside their interrupt handlers, and therefore we can not set
+ * .ack_base for those.
+ */
+static const struct regmap_irq_chip max77759_maxq_irq_chip = {
+	.name = "max77759-maxq",
+	.domain_suffix = "MAXQ",
+	.status_base = MAX77759_MAXQ_REG_UIC_INT1,
+	.mask_base = MAX77759_MAXQ_REG_UIC_INT1_M,
+	.num_regs = 4,
+	.irqs = max77759_maxq_irqs,
+	.num_irqs = ARRAY_SIZE(max77759_maxq_irqs),
+};
+
+static const struct regmap_irq_chip max77759_topsys_irq_chip = {
+	.name = "max77759-topsys",
+	.domain_suffix = "TOPSYS",
+	.status_base = MAX77759_PMIC_REG_TOPSYS_INT,
+	.mask_base = MAX77759_PMIC_REG_TOPSYS_INT_MASK,
+	.ack_base = MAX77759_PMIC_REG_TOPSYS_INT,
+	.num_regs = 1,
+	.irqs = max77759_topsys_irqs,
+	.num_irqs = ARRAY_SIZE(max77759_topsys_irqs),
+};
+
+static const struct regmap_irq_chip max77759_chgr_irq_chip = {
+	.name = "max77759-chgr",
+	.domain_suffix = "CHGR",
+	.status_base = MAX77759_CHGR_REG_CHG_INT,
+	.mask_base = MAX77759_CHGR_REG_CHG_INT_MASK,
+	.ack_base = MAX77759_CHGR_REG_CHG_INT,
+	.num_regs = 2,
+	.irqs = max77759_chgr_irqs,
+	.num_irqs = ARRAY_SIZE(max77759_chgr_irqs),
+};
+
+static const struct max77759_i2c_subdev max77759_i2c_subdevs[] = {
+	{
+		.id = MAX77759_I2C_SUBDEV_ID_MAXQ,
+		.cfg = &max77759_regmap_config_maxq,
+		/* I2C address is same as for sub-block 'top' */
+	},
+	{
+		.id = MAX77759_I2C_SUBDEV_ID_CHARGER,
+		.cfg = &max77759_regmap_config_charger,
+		.i2c_address = 0x69,
+	},
+};
+
+static const struct resource max77759_gpio_resources[] = {
+	DEFINE_RES_IRQ_NAMED(MAX77759_MAXQ_INT_GPIO, "GPI"),
+};
+
+static const struct resource max77759_charger_resources[] = {
+	DEFINE_RES_IRQ_NAMED(MAX77759_CHGR_INT1_AICL,         "AICL"),
+	DEFINE_RES_IRQ_NAMED(MAX77759_CHGR_INT1_CHGIN,        "CHGIN"),
+	DEFINE_RES_IRQ_NAMED(MAX77759_CHGR_INT1_WCIN,         "WCIN"),
+	DEFINE_RES_IRQ_NAMED(MAX77759_CHGR_INT1_CHG,          "CHG"),
+	DEFINE_RES_IRQ_NAMED(MAX77759_CHGR_INT1_BAT,          "BAT"),
+	DEFINE_RES_IRQ_NAMED(MAX77759_CHGR_INT1_INLIM,        "INLIM"),
+	DEFINE_RES_IRQ_NAMED(MAX77759_CHGR_INT1_THM2,         "THM2"),
+	DEFINE_RES_IRQ_NAMED(MAX77759_CHGR_INT1_BYP,          "BYP"),
+	DEFINE_RES_IRQ_NAMED(MAX77759_CHGR_INT2_INSEL,        "INSEL"),
+	DEFINE_RES_IRQ_NAMED(MAX77759_CHGR_INT2_SYS_UVLO1,    "SYS_UVLO1"),
+	DEFINE_RES_IRQ_NAMED(MAX77759_CHGR_INT2_SYS_UVLO2,    "SYS_UVLO2"),
+	DEFINE_RES_IRQ_NAMED(MAX77759_CHGR_INT2_BAT_OILO,     "BAT_OILO"),
+	DEFINE_RES_IRQ_NAMED(MAX77759_CHGR_INT2_CHG_STA_CC,   "CHG_STA_CC"),
+	DEFINE_RES_IRQ_NAMED(MAX77759_CHGR_INT2_CHG_STA_CV,   "CHG_STA_CV"),
+	DEFINE_RES_IRQ_NAMED(MAX77759_CHGR_INT2_CHG_STA_TO,   "CHG_STA_TO"),
+	DEFINE_RES_IRQ_NAMED(MAX77759_CHGR_INT2_CHG_STA_DONE, "CHG_STA_DONE"),
+};
+
+static const struct mfd_cell max77759_cells[] = {
+	MFD_CELL_OF("max77759-nvmem", NULL, NULL, 0, 0,
+		    "maxim,max77759-nvmem"),
+};
+
+static const struct mfd_cell max77759_maxq_cells[] = {
+	MFD_CELL_OF("max77759-gpio", max77759_gpio_resources, NULL, 0, 0,
+		    "maxim,max77759-gpio"),
+};
+
+static const struct mfd_cell max77759_charger_cells[] = {
+	MFD_CELL_RES("max77759-charger", max77759_charger_resources),
+};
+
+int max77759_maxq_command(struct max77759 *max77759,
+			  const struct max77759_maxq_command *cmd,
+			  struct max77759_maxq_response *rsp)
+{
+	DEFINE_FLEX(struct max77759_maxq_response, _rsp, rsp, length, 1);
+	struct device *dev = regmap_get_device(max77759->regmap_maxq);
+	static const unsigned int timeout_ms = 200;
+	int ret;
+
+	if (cmd->length > MAX77759_MAXQ_OPCODE_MAXLENGTH)
+		return -EINVAL;
+
+	/*
+	 * As a convenience for API users when issuing simple commands, rsp is
+	 * allowed to be NULL. In that case we need a temporary here to write
+	 * the response to, as we need to verify that the command was indeed
+	 * completed correctly.
+	 */
+	if (!rsp)
+		rsp = _rsp;
+
+	if (!rsp->length || rsp->length > MAX77759_MAXQ_OPCODE_MAXLENGTH)
+		return -EINVAL;
+
+	guard(mutex)(&max77759->maxq_lock);
+
+	reinit_completion(&max77759->cmd_done);
+
+	/*
+	 * MaxQ latches the message when the DATAOUT32 register is written. If
+	 * cmd->length is shorter we still need to write 0 to it.
+	 */
+	ret = regmap_bulk_write(max77759->regmap_maxq,
+				MAX77759_MAXQ_REG_AP_DATAOUT0, cmd->cmd,
+				cmd->length);
+	if (!ret && cmd->length < MAX77759_MAXQ_OPCODE_MAXLENGTH)
+		ret = regmap_write(max77759->regmap_maxq,
+				   MAX77759_MAXQ_REG_AP_DATAOUT32, 0);
+	if (ret) {
+		dev_err(dev, "writing command failed: %d\n", ret);
+		return ret;
+	}
+
+	/* Wait for response from MaxQ */
+	if (!wait_for_completion_timeout(&max77759->cmd_done,
+					 msecs_to_jiffies(timeout_ms))) {
+		dev_err(dev, "timed out waiting for response\n");
+		return -ETIMEDOUT;
+	}
+
+	ret = regmap_bulk_read(max77759->regmap_maxq,
+			       MAX77759_MAXQ_REG_AP_DATAIN0,
+			       rsp->rsp, rsp->length);
+	if (ret) {
+		dev_err(dev, "reading response failed: %d\n", ret);
+		return ret;
+	}
+
+	/*
+	 * As per the protocol, the first byte of the reply will match the
+	 * request.
+	 */
+	if (cmd->cmd[0] != rsp->rsp[0]) {
+		dev_err(dev, "unexpected opcode response for %#.2x: %*ph\n",
+			cmd->cmd[0], (int)rsp->length, rsp->rsp);
+		return -EIO;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(max77759_maxq_command);
+
+static irqreturn_t apcmdres_irq_handler(int irq, void *irq_data)
+{
+	struct max77759 *max77759 = irq_data;
+
+	regmap_write(max77759->regmap_maxq, MAX77759_MAXQ_REG_UIC_INT1,
+		     MAX77759_MAXQ_REG_UIC_INT1_APCMDRESI);
+
+	complete(&max77759->cmd_done);
+
+	return IRQ_HANDLED;
+}
+
+static int max77759_create_i2c_subdev(struct i2c_client *client,
+				      struct max77759 *max77759,
+				      const struct max77759_i2c_subdev *sd)
+{
+	struct i2c_client *sub;
+	struct regmap *regmap;
+	int ret;
+
+	/*
+	 * If 'sd' has an I2C address, 'sub' will be assigned a new 'dummy'
+	 * device, otherwise use it as-is.
+	 */
+	sub = client;
+	if (sd->i2c_address) {
+		sub = devm_i2c_new_dummy_device(&client->dev,
+						client->adapter,
+						sd->i2c_address);
+
+		if (IS_ERR(sub))
+			return dev_err_probe(&client->dev, PTR_ERR(sub),
+					"failed to claim I2C device %s\n",
+					sd->cfg->name);
+	}
+
+	regmap = devm_regmap_init_i2c(sub, sd->cfg);
+	if (IS_ERR(regmap))
+		return dev_err_probe(&sub->dev, PTR_ERR(regmap),
+				     "regmap init for '%s' failed\n",
+				     sd->cfg->name);
+
+	ret = regmap_attach_dev(&client->dev, regmap, sd->cfg);
+	if (ret)
+		return dev_err_probe(&client->dev, ret,
+				     "regmap attach of '%s' failed\n",
+				     sd->cfg->name);
+
+	if (sd->id == MAX77759_I2C_SUBDEV_ID_MAXQ)
+		max77759->regmap_maxq = regmap;
+	else if (sd->id == MAX77759_I2C_SUBDEV_ID_CHARGER)
+		max77759->regmap_charger = regmap;
+
+	return 0;
+}
+
+static int max77759_add_chained_irq_chip(struct device *dev,
+					 struct regmap *regmap,
+					 int pirq,
+					 struct regmap_irq_chip_data *parent,
+					 const struct regmap_irq_chip *chip,
+					 struct regmap_irq_chip_data **data)
+{
+	int irq, ret;
+
+	irq = regmap_irq_get_virq(parent, pirq);
+	if (irq < 0)
+		return dev_err_probe(dev, irq,
+				     "failed to get parent vIRQ(%d) for chip %s\n",
+				     pirq, chip->name);
+
+	ret = devm_regmap_add_irq_chip(dev, regmap, irq,
+				       IRQF_ONESHOT | IRQF_SHARED, 0, chip,
+				       data);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to add %s IRQ chip\n",
+				     chip->name);
+
+	return 0;
+}
+
+static int max77759_add_chained_maxq(struct i2c_client *client,
+				     struct max77759 *max77759,
+				     struct regmap_irq_chip_data *parent)
+{
+	struct regmap_irq_chip_data *irq_chip_data;
+	int apcmdres_irq;
+	int ret;
+
+	ret = max77759_add_chained_irq_chip(&client->dev,
+					    max77759->regmap_maxq,
+					    MAX77759_INT_MAXQ,
+					    parent,
+					    &max77759_maxq_irq_chip,
+					    &irq_chip_data);
+	if (ret)
+		return ret;
+
+	init_completion(&max77759->cmd_done);
+	apcmdres_irq = regmap_irq_get_virq(irq_chip_data,
+					   MAX77759_MAXQ_INT_APCMDRESI);
+
+	ret = devm_request_threaded_irq(&client->dev, apcmdres_irq,
+					NULL, apcmdres_irq_handler,
+					IRQF_ONESHOT | IRQF_SHARED,
+					dev_name(&client->dev), max77759);
+	if (ret)
+		return dev_err_probe(&client->dev, ret,
+				     "MAX77759_MAXQ_INT_APCMDRESI failed\n");
+
+	ret = devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_AUTO,
+				   max77759_maxq_cells,
+				   ARRAY_SIZE(max77759_maxq_cells),
+				   NULL, 0,
+				   regmap_irq_get_domain(irq_chip_data));
+	if (ret)
+		return dev_err_probe(&client->dev, ret,
+				     "failed to add child devices (MaxQ)\n");
+
+	return 0;
+}
+
+static int max77759_add_chained_topsys(struct i2c_client *client,
+				       struct max77759 *max77759,
+				       struct regmap_irq_chip_data *parent)
+{
+	struct regmap_irq_chip_data *irq_chip_data;
+	int ret;
+
+	ret = max77759_add_chained_irq_chip(&client->dev,
+					    max77759->regmap_top,
+					    MAX77759_INT_TOPSYS,
+					    parent,
+					    &max77759_topsys_irq_chip,
+					    &irq_chip_data);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int max77759_add_chained_charger(struct i2c_client *client,
+					struct max77759 *max77759,
+					struct regmap_irq_chip_data *parent)
+{
+	struct regmap_irq_chip_data *irq_chip_data;
+	int ret;
+
+	ret = max77759_add_chained_irq_chip(&client->dev,
+					    max77759->regmap_charger,
+					    MAX77759_INT_CHGR,
+					    parent,
+					    &max77759_chgr_irq_chip,
+					    &irq_chip_data);
+	if (ret)
+		return ret;
+
+	ret = devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_AUTO,
+				   max77759_charger_cells,
+				   ARRAY_SIZE(max77759_charger_cells),
+				   NULL, 0,
+				   regmap_irq_get_domain(irq_chip_data));
+	if (ret)
+		return dev_err_probe(&client->dev, ret,
+				     "failed to add child devices (charger)\n");
+
+	return 0;
+}
+
+static int max77759_probe(struct i2c_client *client)
+{
+	struct regmap_irq_chip_data *irq_chip_data_pmic;
+	struct max77759 *max77759;
+	unsigned int pmic_id;
+	int ret;
+
+	max77759 = devm_kzalloc(&client->dev, sizeof(*max77759), GFP_KERNEL);
+	if (!max77759)
+		return -ENOMEM;
+
+	i2c_set_clientdata(client, max77759);
+
+	max77759->regmap_top = devm_regmap_init_i2c(client,
+						    &max77759_regmap_config_top);
+	if (IS_ERR(max77759->regmap_top))
+		return dev_err_probe(&client->dev, PTR_ERR(max77759->regmap_top),
+				     "regmap init for '%s' failed\n",
+				     max77759_regmap_config_top.name);
+
+	ret = regmap_read(max77759->regmap_top,
+			  MAX77759_PMIC_REG_PMIC_ID, &pmic_id);
+	if (ret)
+		return dev_err_probe(&client->dev, ret,
+				     "unable to read device ID\n");
+
+	if (pmic_id != MAX77759_CHIP_ID)
+		return dev_err_probe(&client->dev, -ENODEV,
+				     "unsupported device ID %#.2x (%d)\n",
+				     pmic_id, pmic_id);
+
+	ret = devm_mutex_init(&client->dev, &max77759->maxq_lock);
+	if (ret)
+		return ret;
+
+	for (int i = 0; i < ARRAY_SIZE(max77759_i2c_subdevs); i++) {
+		ret = max77759_create_i2c_subdev(client, max77759,
+						 &max77759_i2c_subdevs[i]);
+		if (ret)
+			return ret;
+	}
+
+	ret = devm_regmap_add_irq_chip(&client->dev, max77759->regmap_top,
+				       client->irq, IRQF_ONESHOT | IRQF_SHARED, 0,
+				       &max77759_pmic_irq_chip,
+				       &irq_chip_data_pmic);
+	if (ret)
+		return dev_err_probe(&client->dev, ret,
+				     "failed to add IRQ chip '%s'\n",
+				     max77759_pmic_irq_chip.name);
+
+	ret = max77759_add_chained_maxq(client, max77759, irq_chip_data_pmic);
+	if (ret)
+		return ret;
+
+	ret = max77759_add_chained_topsys(client, max77759, irq_chip_data_pmic);
+	if (ret)
+		return ret;
+
+	ret = max77759_add_chained_charger(client, max77759, irq_chip_data_pmic);
+	if (ret)
+		return ret;
+
+	return devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_AUTO,
+				    max77759_cells, ARRAY_SIZE(max77759_cells),
+				    NULL, 0,
+				    regmap_irq_get_domain(irq_chip_data_pmic));
+}
+
+static const struct i2c_device_id max77759_i2c_id[] = {
+	{ "max77759" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, max77759_i2c_id);
+
+static const struct of_device_id max77759_of_id[] = {
+	{ .compatible = "maxim,max77759", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, max77759_of_id);
+
+static struct i2c_driver max77759_i2c_driver = {
+	.driver = {
+		.name = "max77759",
+		.of_match_table = max77759_of_id,
+	},
+	.probe = max77759_probe,
+	.id_table = max77759_i2c_id,
+};
+module_i2c_driver(max77759_i2c_driver);
+
+MODULE_AUTHOR("André Draszik <andre.draszik@linaro.org>");
+MODULE_DESCRIPTION("Maxim MAX77759 core driver");
+MODULE_LICENSE("GPL");