Merge tag 'gpio-updates-for-v6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux

Pull gpio updates from Bartosz Golaszewski:
 "We have a lot of code refactoring using common helpers and ended up
  removing more lines then we're adding this release cycle.

  Nothing really stands out, just small updates all over the place.

  Core GPIOLIB updates:
   - wake-up poll() in user-space on device unbind
   - improve fwnode usage
   - interrupt domain handling improvements
   - correctly handle the ngpios property in gpio-mmio

  Driver cleanups:
   - remove unneeded calls to platform_set_drvdata() all around the
     place
   - remove unneeded of_match_ptr() expansions whenever a driver depends
     on CONFIG_OF
   - remove redundant calls to dev_err_probe() from gpio-omap and
     gpio-davinci

  Driver improvements:
   - use autopointers and guards from cleanup.h in gpio-sim
   - shrink code in gpio-sim using some common helpers
   - convert the idio family of drivers to using gpio-regmap
   - convert gpio-ws16c48 to using gpio-regmap
   - use devres to simplify code in gpio-pisosr and gpio-mxc
   - update gpio-sifive: support IRQ wake, improve interrupt handling,
     allow building as module
   - make gpio-ge and gpio-bcm-kona OF-independent (plus some minor
     tweaks)
   - add support for new models in gpio-pca953x and gpio-ds4520
   - add runtime PM support to gpio-mxc
   - fix a build warning in gpio-mxs
   - add support for adding pin ranges to gpio-mlxbf3
   - add counter/timer support to gpio-104-dio-48e
   - switch to dynamic GPIO base allocation in gpio-vf610
   - minor oneliners here and there

  Device-tree bindings updates:
   - enable the gpio-line-names property in snps,dw-apb and STMPE GPIO
   - document new models in fsl-imx-gpio, ds4520 and pca95xx
   - convert the bindings for brcm,kona-gpio to YAML"

* tag 'gpio-updates-for-v6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux: (94 commits)
  gpio: pca953x: add support for TCA9538
  dt-bindings: gpio: pca95xx: document new tca9538 chip
  gpio: pca953x: Use i2c_get_match_data()
  gpio: mlxbf3: use capital "OR" for multiple licenses in SPDX
  gpio: pcf857x: Extend match data support for OF tables
  gpio: vf610: switch to dynamic allocat GPIO base
  gpiolib: provide and use gpiod_line_state_notify()
  gpio: cdev: wake up lineevent poll() on device unbind
  gpio: cdev: wake up linereq poll() on device unbind
  gpio: cdev: wake up chardev poll() on device unbind
  gpiolib: add a second blocking notifier to struct gpio_device
  gpio: cdev: open-code to_gpio_chardev_data()
  gpiolib: rename the gpio_device notifier
  gpio: mlxbf3: Support add_pin_ranges()
  gpio: mxc: Use helper function devm_clk_get_optional_enabled()
  gpio: pca9570: fix kerneldoc
  gpio: sim: simplify code with cleanup helpers
  gpio: sim: replace memmove() + strstrip() with skip_spaces() + strim()
  gpio: sim: simplify gpio_sim_device_config_live_store()
  gpio: mxc: release the parent IRQ in runtime suspend
  ...

1 files changed, 185 insertions, 367 deletions

diff --git a/drivers/gpio/gpio-ws16c48.c b/drivers/gpio/gpio-ws16c48.c
index afb42a8e916f..6289b0510cf2 100644
--- a/drivers/gpio/gpio-ws16c48.c
+++ b/drivers/gpio/gpio-ws16c48.c
@@ -3,19 +3,18 @@
  * GPIO driver for the WinSystems WS16C48
  * Copyright (C) 2016 William Breathitt Gray
  */
-#include <linux/bitmap.h>
+#include <linux/bitfield.h>
+#include <linux/bits.h>
 #include <linux/device.h>
-#include <linux/errno.h>
-#include <linux/gpio/driver.h>
-#include <linux/io.h>
-#include <linux/ioport.h>
-#include <linux/interrupt.h>
-#include <linux/irqdesc.h>
+#include <linux/err.h>
+#include <linux/gpio/regmap.h>
+#include <linux/irq.h>
 #include <linux/isa.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/spinlock.h>
+#include <linux/regmap.h>
 #include <linux/types.h>
 
 #define WS16C48_EXTENT 11
@@ -31,371 +30,178 @@ static unsigned int num_irq;
 module_param_hw_array(irq, uint, irq, &num_irq, 0);
 MODULE_PARM_DESC(irq, "WinSystems WS16C48 interrupt line numbers");
 
-/**
- * struct ws16c48_reg - device register structure
- * @port:		Port 0 through 5 I/O
- * @int_pending:	Interrupt Pending
- * @page_lock:		Register page (Bits 7-6) and I/O port lock (Bits 5-0)
- * @pol_enab_int_id:	Interrupt polarity, enable, and ID
- */
-struct ws16c48_reg {
-	u8 port[6];
-	u8 int_pending;
-	u8 page_lock;
-	u8 pol_enab_int_id[3];
+#define WS16C48_DAT_BASE 0x0
+#define WS16C48_PAGE_LOCK 0x7
+#define WS16C48_PAGE_BASE 0x8
+#define WS16C48_POL WS16C48_PAGE_BASE
+#define WS16C48_ENAB WS16C48_PAGE_BASE
+#define WS16C48_INT_ID WS16C48_PAGE_BASE
+
+#define PAGE_LOCK_PAGE_FIELD GENMASK(7, 6)
+#define POL_PAGE u8_encode_bits(1, PAGE_LOCK_PAGE_FIELD)
+#define ENAB_PAGE u8_encode_bits(2, PAGE_LOCK_PAGE_FIELD)
+#define INT_ID_PAGE u8_encode_bits(3, PAGE_LOCK_PAGE_FIELD)
+
+static const struct regmap_range ws16c48_wr_ranges[] = {
+	regmap_reg_range(0x0, 0x5), regmap_reg_range(0x7, 0xA),
+};
+static const struct regmap_range ws16c48_rd_ranges[] = {
+	regmap_reg_range(0x0, 0xA),
+};
+static const struct regmap_range ws16c48_volatile_ranges[] = {
+	regmap_reg_range(0x0, 0x6), regmap_reg_range(0x8, 0xA),
+};
+static const struct regmap_access_table ws16c48_wr_table = {
+	.yes_ranges = ws16c48_wr_ranges,
+	.n_yes_ranges = ARRAY_SIZE(ws16c48_wr_ranges),
+};
+static const struct regmap_access_table ws16c48_rd_table = {
+	.yes_ranges = ws16c48_rd_ranges,
+	.n_yes_ranges = ARRAY_SIZE(ws16c48_rd_ranges),
+};
+static const struct regmap_access_table ws16c48_volatile_table = {
+	.yes_ranges = ws16c48_volatile_ranges,
+	.n_yes_ranges = ARRAY_SIZE(ws16c48_volatile_ranges),
+};
+static const struct regmap_config ws16c48_regmap_config = {
+	.reg_bits = 8,
+	.reg_stride = 1,
+	.val_bits = 8,
+	.io_port = true,
+	.wr_table = &ws16c48_wr_table,
+	.rd_table = &ws16c48_rd_table,
+	.volatile_table = &ws16c48_volatile_table,
+	.cache_type = REGCACHE_FLAT,
+	.use_raw_spinlock = true,
+};
+
+#define WS16C48_NGPIO_PER_REG 8
+#define WS16C48_REGMAP_IRQ(_id)							\
+	[_id] = {								\
+		.reg_offset = (_id) / WS16C48_NGPIO_PER_REG,			\
+		.mask = BIT((_id) % WS16C48_NGPIO_PER_REG),			\
+		.type = {							\
+			.type_reg_offset = (_id) / WS16C48_NGPIO_PER_REG,	\
+			.types_supported = IRQ_TYPE_EDGE_BOTH,			\
+		},								\
+	}
+
+/* Only the first 24 lines (Port 0-2) support interrupts */
+#define WS16C48_NUM_IRQS 24
+static const struct regmap_irq ws16c48_regmap_irqs[WS16C48_NUM_IRQS] = {
+	WS16C48_REGMAP_IRQ(0), WS16C48_REGMAP_IRQ(1), WS16C48_REGMAP_IRQ(2), /* 0-2 */
+	WS16C48_REGMAP_IRQ(3), WS16C48_REGMAP_IRQ(4), WS16C48_REGMAP_IRQ(5), /* 3-5 */
+	WS16C48_REGMAP_IRQ(6), WS16C48_REGMAP_IRQ(7), WS16C48_REGMAP_IRQ(8), /* 6-8 */
+	WS16C48_REGMAP_IRQ(9), WS16C48_REGMAP_IRQ(10), WS16C48_REGMAP_IRQ(11), /* 9-11 */
+	WS16C48_REGMAP_IRQ(12), WS16C48_REGMAP_IRQ(13), WS16C48_REGMAP_IRQ(14), /* 12-14 */
+	WS16C48_REGMAP_IRQ(15), WS16C48_REGMAP_IRQ(16), WS16C48_REGMAP_IRQ(17), /* 15-17 */
+	WS16C48_REGMAP_IRQ(18), WS16C48_REGMAP_IRQ(19), WS16C48_REGMAP_IRQ(20), /* 18-20 */
+	WS16C48_REGMAP_IRQ(21), WS16C48_REGMAP_IRQ(22), WS16C48_REGMAP_IRQ(23), /* 21-23 */
 };
 
 /**
  * struct ws16c48_gpio - GPIO device private data structure
- * @chip:	instance of the gpio_chip
- * @io_state:	bit I/O state (whether bit is set to input or output)
- * @out_state:	output bits state
+ * @map:	regmap for the device
  * @lock:	synchronization lock to prevent I/O race conditions
  * @irq_mask:	I/O bits affected by interrupts
- * @flow_mask:	IRQ flow type mask for the respective I/O bits
- * @reg:	I/O address offset for the device registers
  */
 struct ws16c48_gpio {
-	struct gpio_chip chip;
-	unsigned char io_state[6];
-	unsigned char out_state[6];
+	struct regmap *map;
 	raw_spinlock_t lock;
-	unsigned long irq_mask;
-	unsigned long flow_mask;
-	struct ws16c48_reg __iomem *reg;
+	u8 irq_mask[WS16C48_NUM_IRQS / WS16C48_NGPIO_PER_REG];
 };
 
-static int ws16c48_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
+static int ws16c48_handle_pre_irq(void *const irq_drv_data) __acquires(&ws16c48gpio->lock)
 {
-	struct ws16c48_gpio *const ws16c48gpio = gpiochip_get_data(chip);
-	const unsigned port = offset / 8;
-	const unsigned mask = BIT(offset % 8);
+	struct ws16c48_gpio *const ws16c48gpio = irq_drv_data;
 
-	if (ws16c48gpio->io_state[port] & mask)
-		return GPIO_LINE_DIRECTION_IN;
-
-	return GPIO_LINE_DIRECTION_OUT;
-}
-
-static int ws16c48_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
-{
-	struct ws16c48_gpio *const ws16c48gpio = gpiochip_get_data(chip);
-	const unsigned port = offset / 8;
-	const unsigned mask = BIT(offset % 8);
-	unsigned long flags;
-
-	raw_spin_lock_irqsave(&ws16c48gpio->lock, flags);
-
-	ws16c48gpio->io_state[port] |= mask;
-	ws16c48gpio->out_state[port] &= ~mask;
-	iowrite8(ws16c48gpio->out_state[port], ws16c48gpio->reg->port + port);
-
-	raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
+	/* Lock to prevent Page/Lock register change while we handle IRQ */
+	raw_spin_lock(&ws16c48gpio->lock);
 
 	return 0;
 }
 
-static int ws16c48_gpio_direction_output(struct gpio_chip *chip,
-	unsigned offset, int value)
+static int ws16c48_handle_post_irq(void *const irq_drv_data) __releases(&ws16c48gpio->lock)
 {
-	struct ws16c48_gpio *const ws16c48gpio = gpiochip_get_data(chip);
-	const unsigned port = offset / 8;
-	const unsigned mask = BIT(offset % 8);
-	unsigned long flags;
-
-	raw_spin_lock_irqsave(&ws16c48gpio->lock, flags);
+	struct ws16c48_gpio *const ws16c48gpio = irq_drv_data;
 
-	ws16c48gpio->io_state[port] &= ~mask;
-	if (value)
-		ws16c48gpio->out_state[port] |= mask;
-	else
-		ws16c48gpio->out_state[port] &= ~mask;
-	iowrite8(ws16c48gpio->out_state[port], ws16c48gpio->reg->port + port);
-
-	raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
+	raw_spin_unlock(&ws16c48gpio->lock);
 
 	return 0;
 }
 
-static int ws16c48_gpio_get(struct gpio_chip *chip, unsigned offset)
-{
-	struct ws16c48_gpio *const ws16c48gpio = gpiochip_get_data(chip);
-	const unsigned port = offset / 8;
-	const unsigned mask = BIT(offset % 8);
-	unsigned long flags;
-	unsigned port_state;
-
-	raw_spin_lock_irqsave(&ws16c48gpio->lock, flags);
-
-	/* ensure that GPIO is set for input */
-	if (!(ws16c48gpio->io_state[port] & mask)) {
-		raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
-		return -EINVAL;
-	}
-
-	port_state = ioread8(ws16c48gpio->reg->port + port);
-
-	raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
-
-	return !!(port_state & mask);
-}
-
-static int ws16c48_gpio_get_multiple(struct gpio_chip *chip,
-	unsigned long *mask, unsigned long *bits)
-{
-	struct ws16c48_gpio *const ws16c48gpio = gpiochip_get_data(chip);
-	unsigned long offset;
-	unsigned long gpio_mask;
-	size_t index;
-	u8 __iomem *port_addr;
-	unsigned long port_state;
-
-	/* clear bits array to a clean slate */
-	bitmap_zero(bits, chip->ngpio);
-
-	for_each_set_clump8(offset, gpio_mask, mask, chip->ngpio) {
-		index = offset / 8;
-		port_addr = ws16c48gpio->reg->port + index;
-		port_state = ioread8(port_addr) & gpio_mask;
-
-		bitmap_set_value8(bits, port_state, offset);
-	}
-
-	return 0;
-}
-
-static void ws16c48_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
-{
-	struct ws16c48_gpio *const ws16c48gpio = gpiochip_get_data(chip);
-	const unsigned port = offset / 8;
-	const unsigned mask = BIT(offset % 8);
-	unsigned long flags;
-
-	raw_spin_lock_irqsave(&ws16c48gpio->lock, flags);
-
-	/* ensure that GPIO is set for output */
-	if (ws16c48gpio->io_state[port] & mask) {
-		raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
-		return;
-	}
-
-	if (value)
-		ws16c48gpio->out_state[port] |= mask;
-	else
-		ws16c48gpio->out_state[port] &= ~mask;
-	iowrite8(ws16c48gpio->out_state[port], ws16c48gpio->reg->port + port);
-
-	raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
-}
-
-static void ws16c48_gpio_set_multiple(struct gpio_chip *chip,
-	unsigned long *mask, unsigned long *bits)
-{
-	struct ws16c48_gpio *const ws16c48gpio = gpiochip_get_data(chip);
-	unsigned long offset;
-	unsigned long gpio_mask;
-	size_t index;
-	u8 __iomem *port_addr;
-	unsigned long bitmask;
-	unsigned long flags;
-
-	for_each_set_clump8(offset, gpio_mask, mask, chip->ngpio) {
-		index = offset / 8;
-		port_addr = ws16c48gpio->reg->port + index;
-
-		/* mask out GPIO configured for input */
-		gpio_mask &= ~ws16c48gpio->io_state[index];
-		bitmask = bitmap_get_value8(bits, offset) & gpio_mask;
-
-		raw_spin_lock_irqsave(&ws16c48gpio->lock, flags);
-
-		/* update output state data and set device gpio register */
-		ws16c48gpio->out_state[index] &= ~gpio_mask;
-		ws16c48gpio->out_state[index] |= bitmask;
-		iowrite8(ws16c48gpio->out_state[index], port_addr);
-
-		raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
-	}
-}
-
-static void ws16c48_irq_ack(struct irq_data *data)
+static int ws16c48_handle_mask_sync(const int index, const unsigned int mask_buf_def,
+				    const unsigned int mask_buf, void *const irq_drv_data)
 {
-	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
-	struct ws16c48_gpio *const ws16c48gpio = gpiochip_get_data(chip);
-	const unsigned long offset = irqd_to_hwirq(data);
-	const unsigned port = offset / 8;
-	const unsigned mask = BIT(offset % 8);
+	struct ws16c48_gpio *const ws16c48gpio = irq_drv_data;
 	unsigned long flags;
-	unsigned port_state;
-
-	/* only the first 3 ports support interrupts */
-	if (port > 2)
-		return;
+	int ret = 0;
 
 	raw_spin_lock_irqsave(&ws16c48gpio->lock, flags);
 
-	port_state = ws16c48gpio->irq_mask >> (8*port);
+	/* exit early if no change since the last mask sync */
+	if (mask_buf == ws16c48gpio->irq_mask[index])
+		goto exit_unlock;
+	ws16c48gpio->irq_mask[index] = mask_buf;
 
-	/* Select Register Page 2; Unlock all I/O ports */
-	iowrite8(0x80, &ws16c48gpio->reg->page_lock);
+	ret = regmap_write(ws16c48gpio->map, WS16C48_PAGE_LOCK, ENAB_PAGE);
+	if (ret)
+		goto exit_unlock;
 
-	/* Clear pending interrupt */
-	iowrite8(port_state & ~mask, ws16c48gpio->reg->pol_enab_int_id + port);
-	iowrite8(port_state | mask, ws16c48gpio->reg->pol_enab_int_id + port);
+	/* Update ENAB register (inverted mask) */
+	ret = regmap_write(ws16c48gpio->map, WS16C48_ENAB + index, ~mask_buf);
+	if (ret)
+		goto exit_unlock;
 
-	/* Select Register Page 3; Unlock all I/O ports */
-	iowrite8(0xC0, &ws16c48gpio->reg->page_lock);
+	ret = regmap_write(ws16c48gpio->map, WS16C48_PAGE_LOCK, INT_ID_PAGE);
+	if (ret)
+		goto exit_unlock;
 
+exit_unlock:
 	raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
-}
-
-static void ws16c48_irq_mask(struct irq_data *data)
-{
-	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
-	struct ws16c48_gpio *const ws16c48gpio = gpiochip_get_data(chip);
-	const unsigned long offset = irqd_to_hwirq(data);
-	const unsigned long mask = BIT(offset);
-	const unsigned port = offset / 8;
-	unsigned long flags;
-	unsigned long port_state;
-
-	/* only the first 3 ports support interrupts */
-	if (port > 2)
-		return;
-
-	raw_spin_lock_irqsave(&ws16c48gpio->lock, flags);
 
-	ws16c48gpio->irq_mask &= ~mask;
-	gpiochip_disable_irq(chip, offset);
-	port_state = ws16c48gpio->irq_mask >> (8 * port);
-
-	/* Select Register Page 2; Unlock all I/O ports */
-	iowrite8(0x80, &ws16c48gpio->reg->page_lock);
-
-	/* Disable interrupt */
-	iowrite8(port_state, ws16c48gpio->reg->pol_enab_int_id + port);
-
-	/* Select Register Page 3; Unlock all I/O ports */
-	iowrite8(0xC0, &ws16c48gpio->reg->page_lock);
-
-	raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
+	return ret;
 }
 
-static void ws16c48_irq_unmask(struct irq_data *data)
+static int ws16c48_set_type_config(unsigned int **const buf, const unsigned int type,
+				   const struct regmap_irq *const irq_data, const int idx,
+				   void *const irq_drv_data)
 {
-	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
-	struct ws16c48_gpio *const ws16c48gpio = gpiochip_get_data(chip);
-	const unsigned long offset = irqd_to_hwirq(data);
-	const unsigned long mask = BIT(offset);
-	const unsigned port = offset / 8;
+	struct ws16c48_gpio *const ws16c48gpio = irq_drv_data;
+	unsigned int polarity;
 	unsigned long flags;
-	unsigned long port_state;
-
-	/* only the first 3 ports support interrupts */
-	if (port > 2)
-		return;
-
-	raw_spin_lock_irqsave(&ws16c48gpio->lock, flags);
-
-	gpiochip_enable_irq(chip, offset);
-	ws16c48gpio->irq_mask |= mask;
-	port_state = ws16c48gpio->irq_mask >> (8 * port);
-
-	/* Select Register Page 2; Unlock all I/O ports */
-	iowrite8(0x80, &ws16c48gpio->reg->page_lock);
-
-	/* Enable interrupt */
-	iowrite8(port_state, ws16c48gpio->reg->pol_enab_int_id + port);
-
-	/* Select Register Page 3; Unlock all I/O ports */
-	iowrite8(0xC0, &ws16c48gpio->reg->page_lock);
-
-	raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
-}
+	int ret;
 
-static int ws16c48_irq_set_type(struct irq_data *data, unsigned flow_type)
-{
-	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
-	struct ws16c48_gpio *const ws16c48gpio = gpiochip_get_data(chip);
-	const unsigned long offset = irqd_to_hwirq(data);
-	const unsigned long mask = BIT(offset);
-	const unsigned port = offset / 8;
-	unsigned long flags;
-	unsigned long port_state;
-
-	/* only the first 3 ports support interrupts */
-	if (port > 2)
-		return -EINVAL;
-
-	raw_spin_lock_irqsave(&ws16c48gpio->lock, flags);
-
-	switch (flow_type) {
-	case IRQ_TYPE_NONE:
-		break;
+	switch (type) {
 	case IRQ_TYPE_EDGE_RISING:
-		ws16c48gpio->flow_mask |= mask;
+		polarity = irq_data->mask;
 		break;
 	case IRQ_TYPE_EDGE_FALLING:
-		ws16c48gpio->flow_mask &= ~mask;
+		polarity = 0;
 		break;
 	default:
-		raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
 		return -EINVAL;
 	}
 
-	port_state = ws16c48gpio->flow_mask >> (8 * port);
+	raw_spin_lock_irqsave(&ws16c48gpio->lock, flags);
 
-	/* Select Register Page 1; Unlock all I/O ports */
-	iowrite8(0x40, &ws16c48gpio->reg->page_lock);
+	ret = regmap_write(ws16c48gpio->map, WS16C48_PAGE_LOCK, POL_PAGE);
+	if (ret)
+		goto exit_unlock;
 
 	/* Set interrupt polarity */
-	iowrite8(port_state, ws16c48gpio->reg->pol_enab_int_id + port);
+	ret = regmap_update_bits(ws16c48gpio->map, WS16C48_POL + idx, irq_data->mask, polarity);
+	if (ret)
+		goto exit_unlock;
 
-	/* Select Register Page 3; Unlock all I/O ports */
-	iowrite8(0xC0, &ws16c48gpio->reg->page_lock);
+	ret = regmap_write(ws16c48gpio->map, WS16C48_PAGE_LOCK, INT_ID_PAGE);
+	if (ret)
+		goto exit_unlock;
 
+exit_unlock:
 	raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
 
-	return 0;
-}
-
-static const struct irq_chip ws16c48_irqchip = {
-	.name = "ws16c48",
-	.irq_ack = ws16c48_irq_ack,
-	.irq_mask = ws16c48_irq_mask,
-	.irq_unmask = ws16c48_irq_unmask,
-	.irq_set_type = ws16c48_irq_set_type,
-	.flags = IRQCHIP_IMMUTABLE,
-	GPIOCHIP_IRQ_RESOURCE_HELPERS,
-};
-
-static irqreturn_t ws16c48_irq_handler(int irq, void *dev_id)
-{
-	struct ws16c48_gpio *const ws16c48gpio = dev_id;
-	struct gpio_chip *const chip = &ws16c48gpio->chip;
-	struct ws16c48_reg __iomem *const reg = ws16c48gpio->reg;
-	unsigned long int_pending;
-	unsigned long port;
-	unsigned long int_id;
-	unsigned long gpio;
-
-	int_pending = ioread8(&reg->int_pending) & 0x7;
-	if (!int_pending)
-		return IRQ_NONE;
-
-	/* loop until all pending interrupts are handled */
-	do {
-		for_each_set_bit(port, &int_pending, 3) {
-			int_id = ioread8(reg->pol_enab_int_id + port);
-			for_each_set_bit(gpio, &int_id, 8)
-				generic_handle_domain_irq(chip->irq.domain,
-							  gpio + 8*port);
-		}
-
-		int_pending = ioread8(&reg->int_pending) & 0x7;
-	} while (int_pending);
-
-	return IRQ_HANDLED;
+	return ret;
 }
 
 #define WS16C48_NGPIO 48
@@ -414,30 +220,37 @@ static const char *ws16c48_names[WS16C48_NGPIO] = {
 	"Port 5 Bit 4", "Port 5 Bit 5", "Port 5 Bit 6", "Port 5 Bit 7"
 };
 
-static int ws16c48_irq_init_hw(struct gpio_chip *gc)
+static int ws16c48_irq_init_hw(struct regmap *const map)
 {
-	struct ws16c48_gpio *const ws16c48gpio = gpiochip_get_data(gc);
+	int err;
 
-	/* Select Register Page 2; Unlock all I/O ports */
-	iowrite8(0x80, &ws16c48gpio->reg->page_lock);
+	err = regmap_write(map, WS16C48_PAGE_LOCK, ENAB_PAGE);
+	if (err)
+		return err;
 
 	/* Disable interrupts for all lines */
-	iowrite8(0, &ws16c48gpio->reg->pol_enab_int_id[0]);
-	iowrite8(0, &ws16c48gpio->reg->pol_enab_int_id[1]);
-	iowrite8(0, &ws16c48gpio->reg->pol_enab_int_id[2]);
-
-	/* Select Register Page 3; Unlock all I/O ports */
-	iowrite8(0xC0, &ws16c48gpio->reg->page_lock);
+	err = regmap_write(map, WS16C48_ENAB + 0, 0x00);
+	if (err)
+		return err;
+	err = regmap_write(map, WS16C48_ENAB + 1, 0x00);
+	if (err)
+		return err;
+	err = regmap_write(map, WS16C48_ENAB + 2, 0x00);
+	if (err)
+		return err;
 
-	return 0;
+	return regmap_write(map, WS16C48_PAGE_LOCK, INT_ID_PAGE);
 }
 
 static int ws16c48_probe(struct device *dev, unsigned int id)
 {
 	struct ws16c48_gpio *ws16c48gpio;
 	const char *const name = dev_name(dev);
-	struct gpio_irq_chip *girq;
 	int err;
+	struct gpio_regmap_config gpio_config = {};
+	void __iomem *regs;
+	struct regmap_irq_chip *chip;
+	struct regmap_irq_chip_data *chip_data;
 
 	ws16c48gpio = devm_kzalloc(dev, sizeof(*ws16c48gpio), GFP_KERNEL);
 	if (!ws16c48gpio)
@@ -449,50 +262,55 @@ static int ws16c48_probe(struct device *dev, unsigned int id)
 		return -EBUSY;
 	}
 
-	ws16c48gpio->reg = devm_ioport_map(dev, base[id], WS16C48_EXTENT);
-	if (!ws16c48gpio->reg)
+	regs = devm_ioport_map(dev, base[id], WS16C48_EXTENT);
+	if (!regs)
 		return -ENOMEM;
 
-	ws16c48gpio->chip.label = name;
-	ws16c48gpio->chip.parent = dev;
-	ws16c48gpio->chip.owner = THIS_MODULE;
-	ws16c48gpio->chip.base = -1;
-	ws16c48gpio->chip.ngpio = WS16C48_NGPIO;
-	ws16c48gpio->chip.names = ws16c48_names;
-	ws16c48gpio->chip.get_direction = ws16c48_gpio_get_direction;
-	ws16c48gpio->chip.direction_input = ws16c48_gpio_direction_input;
-	ws16c48gpio->chip.direction_output = ws16c48_gpio_direction_output;
-	ws16c48gpio->chip.get = ws16c48_gpio_get;
-	ws16c48gpio->chip.get_multiple = ws16c48_gpio_get_multiple;
-	ws16c48gpio->chip.set = ws16c48_gpio_set;
-	ws16c48gpio->chip.set_multiple = ws16c48_gpio_set_multiple;
-
-	girq = &ws16c48gpio->chip.irq;
-	gpio_irq_chip_set_chip(girq, &ws16c48_irqchip);
-	/* This will let us handle the parent IRQ in the driver */
-	girq->parent_handler = NULL;
-	girq->num_parents = 0;
-	girq->parents = NULL;
-	girq->default_type = IRQ_TYPE_NONE;
-	girq->handler = handle_edge_irq;
-	girq->init_hw = ws16c48_irq_init_hw;
+	ws16c48gpio->map = devm_regmap_init_mmio(dev, regs, &ws16c48_regmap_config);
+	if (IS_ERR(ws16c48gpio->map))
+		return dev_err_probe(dev, PTR_ERR(ws16c48gpio->map),
+				     "Unable to initialize register map\n");
 
-	raw_spin_lock_init(&ws16c48gpio->lock);
+	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
 
-	err = devm_gpiochip_add_data(dev, &ws16c48gpio->chip, ws16c48gpio);
-	if (err) {
-		dev_err(dev, "GPIO registering failed (%d)\n", err);
-		return err;
-	}
+	chip->name = name;
+	chip->status_base = WS16C48_INT_ID;
+	chip->mask_base = WS16C48_ENAB;
+	chip->ack_base = WS16C48_INT_ID;
+	chip->num_regs = 3;
+	chip->irqs = ws16c48_regmap_irqs;
+	chip->num_irqs = ARRAY_SIZE(ws16c48_regmap_irqs);
+	chip->handle_pre_irq = ws16c48_handle_pre_irq;
+	chip->handle_post_irq = ws16c48_handle_post_irq;
+	chip->handle_mask_sync = ws16c48_handle_mask_sync;
+	chip->set_type_config = ws16c48_set_type_config;
+	chip->irq_drv_data = ws16c48gpio;
 
-	err = devm_request_irq(dev, irq[id], ws16c48_irq_handler, IRQF_SHARED,
-		name, ws16c48gpio);
-	if (err) {
-		dev_err(dev, "IRQ handler registering failed (%d)\n", err);
+	raw_spin_lock_init(&ws16c48gpio->lock);
+
+	/* Initialize to prevent spurious interrupts before we're ready */
+	err = ws16c48_irq_init_hw(ws16c48gpio->map);
+	if (err)
 		return err;
-	}
 
-	return 0;
+	err = devm_regmap_add_irq_chip(dev, ws16c48gpio->map, irq[id], 0, 0, chip, &chip_data);
+	if (err)
+		return dev_err_probe(dev, err, "IRQ registration failed\n");
+
+	gpio_config.parent = dev;
+	gpio_config.regmap = ws16c48gpio->map;
+	gpio_config.ngpio = WS16C48_NGPIO;
+	gpio_config.names = ws16c48_names;
+	gpio_config.reg_dat_base = GPIO_REGMAP_ADDR(WS16C48_DAT_BASE);
+	gpio_config.reg_set_base = GPIO_REGMAP_ADDR(WS16C48_DAT_BASE);
+	/* Setting a GPIO to 0 allows it to be used as an input */
+	gpio_config.reg_dir_out_base = GPIO_REGMAP_ADDR(WS16C48_DAT_BASE);
+	gpio_config.ngpio_per_reg = WS16C48_NGPIO_PER_REG;
+	gpio_config.irq_domain = regmap_irq_get_domain(chip_data);
+
+	return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(dev, &gpio_config));
 }
 
 static struct isa_driver ws16c48_driver = {