diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index ec7cfd4f52b1..a9852782566d 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -871,7 +871,8 @@ config GPIO_104_IDI_48
 	depends on PC104
 	select ISA_BUS_API
 	select GPIOLIB_IRQCHIP
-	select GPIO_I8255
+	select REGMAP_IRQ
+	select GPIO_REGMAP
 	help
 	  Enables GPIO support for the ACCES 104-IDI-48 family (104-IDI-48A,
 	  104-IDI-48AC, 104-IDI-48B, 104-IDI-48BC). The base port addresses for
diff --git a/drivers/gpio/gpio-104-idi-48.c b/drivers/gpio/gpio-104-idi-48.c
index c5e231fde1af..120ae6d01f43 100644
--- a/drivers/gpio/gpio-104-idi-48.c
+++ b/drivers/gpio/gpio-104-idi-48.c
@@ -8,23 +8,18 @@
  */
 #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/err.h>
+#include <linux/gpio/regmap.h>
 #include <linux/interrupt.h>
-#include <linux/irqdesc.h>
+#include <linux/ioport.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>
 
-#include "gpio-i8255.h"
-
-MODULE_IMPORT_NS(I8255);
-
 #define IDI_48_EXTENT 8
 #define MAX_NUM_IDI_48 max_num_isa_dev(IDI_48_EXTENT)
 
@@ -38,185 +33,82 @@ static unsigned int num_irq;
 module_param_hw_array(irq, uint, irq, &num_irq, 0);
 MODULE_PARM_DESC(irq, "ACCES 104-IDI-48 interrupt line numbers");
 
-/**
- * struct idi_48_reg - device register structure
- * @port0:	Port 0 Inputs
- * @unused:	Unused
- * @port1:	Port 1 Inputs
- * @irq:	Read: IRQ Status Register/IRQ Clear
- *		Write: IRQ Enable/Disable
- */
-struct idi_48_reg {
-	u8 port0[3];
-	u8 unused;
-	u8 port1[3];
-	u8 irq;
-};
+#define IDI48_IRQ_REG 0x7
 
-/**
- * struct idi_48_gpio - GPIO device private data structure
- * @chip:	instance of the gpio_chip
- * @lock:	synchronization lock to prevent I/O race conditions
- * @irq_mask:	input bits affected by interrupts
- * @reg:	I/O address offset for the device registers
- * @cos_enb:	Change-Of-State IRQ enable boundaries mask
- */
-struct idi_48_gpio {
-	struct gpio_chip chip;
-	spinlock_t lock;
-	unsigned char irq_mask[6];
-	struct idi_48_reg __iomem *reg;
-	unsigned char cos_enb;
-};
-
-static int idi_48_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
+static int idi_48_reg_mask_xlate(struct gpio_regmap *gpio, unsigned int base,
+				 unsigned int offset, unsigned int *reg,
+				 unsigned int *mask)
 {
-	return GPIO_LINE_DIRECTION_IN;
-}
+	const unsigned int line = offset % 8;
+	const unsigned int stride = offset / 8;
+	const unsigned int port = (stride / 3) * 4;
+	const unsigned int port_stride = stride % 3;
 
-static int idi_48_gpio_direction_input(struct gpio_chip *chip, unsigned int offset)
-{
-	return 0;
-}
-
-static int idi_48_gpio_get(struct gpio_chip *chip, unsigned int offset)
-{
-	struct idi_48_gpio *const idi48gpio = gpiochip_get_data(chip);
-	void __iomem *const ppi = idi48gpio->reg;
-
-	return i8255_get(ppi, offset);
-}
-
-static int idi_48_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
-	unsigned long *bits)
-{
-	struct idi_48_gpio *const idi48gpio = gpiochip_get_data(chip);
-	void __iomem *const ppi = idi48gpio->reg;
-
-	i8255_get_multiple(ppi, mask, bits, chip->ngpio);
+	*reg = base + port + port_stride;
+	*mask = BIT(line);
 
 	return 0;
 }
 
-static void idi_48_irq_ack(struct irq_data *data)
-{
-}
-
-static void idi_48_irq_mask(struct irq_data *data)
-{
-	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
-	struct idi_48_gpio *const idi48gpio = gpiochip_get_data(chip);
-	const unsigned int offset = irqd_to_hwirq(data);
-	const unsigned long boundary = offset / 8;
-	const unsigned long mask = BIT(offset % 8);
-	unsigned long flags;
-
-	spin_lock_irqsave(&idi48gpio->lock, flags);
-
-	idi48gpio->irq_mask[boundary] &= ~mask;
-	gpiochip_disable_irq(chip, offset);
-
-	/* Exit early if there are still input lines with IRQ unmasked */
-	if (idi48gpio->irq_mask[boundary])
-		goto exit;
-
-	idi48gpio->cos_enb &= ~BIT(boundary);
-
-	iowrite8(idi48gpio->cos_enb, &idi48gpio->reg->irq);
-
-exit:
-	spin_unlock_irqrestore(&idi48gpio->lock, flags);
-}
-
-static void idi_48_irq_unmask(struct irq_data *data)
-{
-	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
-	struct idi_48_gpio *const idi48gpio = gpiochip_get_data(chip);
-	const unsigned int offset = irqd_to_hwirq(data);
-	const unsigned long boundary = offset / 8;
-	const unsigned long mask = BIT(offset % 8);
-	unsigned int prev_irq_mask;
-	unsigned long flags;
-
-	spin_lock_irqsave(&idi48gpio->lock, flags);
-
-	prev_irq_mask = idi48gpio->irq_mask[boundary];
-
-	gpiochip_enable_irq(chip, offset);
-	idi48gpio->irq_mask[boundary] |= mask;
-
-	/* Exit early if IRQ was already unmasked for this boundary */
-	if (prev_irq_mask)
-		goto exit;
-
-	idi48gpio->cos_enb |= BIT(boundary);
-
-	iowrite8(idi48gpio->cos_enb, &idi48gpio->reg->irq);
-
-exit:
-	spin_unlock_irqrestore(&idi48gpio->lock, flags);
-}
-
-static int idi_48_irq_set_type(struct irq_data *data, unsigned int flow_type)
-{
-	/* The only valid irq types are none and both-edges */
-	if (flow_type != IRQ_TYPE_NONE &&
-		(flow_type & IRQ_TYPE_EDGE_BOTH) != IRQ_TYPE_EDGE_BOTH)
-		return -EINVAL;
-
-	return 0;
-}
-
-static const struct irq_chip idi_48_irqchip = {
-	.name = "104-idi-48",
-	.irq_ack = idi_48_irq_ack,
-	.irq_mask = idi_48_irq_mask,
-	.irq_unmask = idi_48_irq_unmask,
-	.irq_set_type = idi_48_irq_set_type,
-	.flags = IRQCHIP_IMMUTABLE,
-	GPIOCHIP_IRQ_RESOURCE_HELPERS,
+static const struct regmap_range idi_48_wr_ranges[] = {
+	regmap_reg_range(0x0, 0x6),
+};
+static const struct regmap_range idi_48_rd_ranges[] = {
+	regmap_reg_range(0x0, 0x2), regmap_reg_range(0x4, 0x7),
+};
+static const struct regmap_range idi_48_precious_ranges[] = {
+	regmap_reg_range(0x7, 0x7),
+};
+static const struct regmap_access_table idi_48_wr_table = {
+	.no_ranges = idi_48_wr_ranges,
+	.n_no_ranges = ARRAY_SIZE(idi_48_wr_ranges),
+};
+static const struct regmap_access_table idi_48_rd_table = {
+	.yes_ranges = idi_48_rd_ranges,
+	.n_yes_ranges = ARRAY_SIZE(idi_48_rd_ranges),
+};
+static const struct regmap_access_table idi_48_precious_table = {
+	.yes_ranges = idi_48_precious_ranges,
+	.n_yes_ranges = ARRAY_SIZE(idi_48_precious_ranges),
+};
+static const struct regmap_config idi48_regmap_config = {
+	.reg_bits = 8,
+	.reg_stride = 1,
+	.val_bits = 8,
+	.io_port = true,
+	.max_register = 0x6,
+	.wr_table = &idi_48_wr_table,
+	.rd_table = &idi_48_rd_table,
+	.precious_table = &idi_48_precious_table,
 };
-
-static irqreturn_t idi_48_irq_handler(int irq, void *dev_id)
-{
-	struct idi_48_gpio *const idi48gpio = dev_id;
-	unsigned long cos_status;
-	unsigned long boundary;
-	unsigned long irq_mask;
-	unsigned long bit_num;
-	unsigned long gpio;
-	struct gpio_chip *const chip = &idi48gpio->chip;
-
-	spin_lock(&idi48gpio->lock);
-
-	cos_status = ioread8(&idi48gpio->reg->irq);
-
-	/* IRQ Status (bit 6) is active low (0 = IRQ generated by device) */
-	if (cos_status & BIT(6)) {
-		spin_unlock(&idi48gpio->lock);
-		return IRQ_NONE;
-	}
-
-	/* Bit 0-5 indicate which Change-Of-State boundary triggered the IRQ */
-	cos_status &= 0x3F;
-
-	for_each_set_bit(boundary, &cos_status, 6) {
-		irq_mask = idi48gpio->irq_mask[boundary];
-
-		for_each_set_bit(bit_num, &irq_mask, 8) {
-			gpio = bit_num + boundary * 8;
-
-			generic_handle_domain_irq(chip->irq.domain,
-						  gpio);
-		}
-	}
-
-	spin_unlock(&idi48gpio->lock);
-
-	return IRQ_HANDLED;
-}
 
 #define IDI48_NGPIO 48
+
+#define IDI48_REGMAP_IRQ(_id) \
+	[_id] = { \
+		.mask = BIT((_id) / 8), \
+		.type = { .types_supported = IRQ_TYPE_EDGE_BOTH, }, \
+	}
+
+static const struct regmap_irq idi48_regmap_irqs[IDI48_NGPIO] = {
+	IDI48_REGMAP_IRQ(0), IDI48_REGMAP_IRQ(1), IDI48_REGMAP_IRQ(2),
+	IDI48_REGMAP_IRQ(3), IDI48_REGMAP_IRQ(4), IDI48_REGMAP_IRQ(5),
+	IDI48_REGMAP_IRQ(6), IDI48_REGMAP_IRQ(7), IDI48_REGMAP_IRQ(8),
+	IDI48_REGMAP_IRQ(9), IDI48_REGMAP_IRQ(10), IDI48_REGMAP_IRQ(11),
+	IDI48_REGMAP_IRQ(12), IDI48_REGMAP_IRQ(13), IDI48_REGMAP_IRQ(14),
+	IDI48_REGMAP_IRQ(15), IDI48_REGMAP_IRQ(16), IDI48_REGMAP_IRQ(17),
+	IDI48_REGMAP_IRQ(18), IDI48_REGMAP_IRQ(19), IDI48_REGMAP_IRQ(20),
+	IDI48_REGMAP_IRQ(21), IDI48_REGMAP_IRQ(22), IDI48_REGMAP_IRQ(23),
+	IDI48_REGMAP_IRQ(24), IDI48_REGMAP_IRQ(25), IDI48_REGMAP_IRQ(26),
+	IDI48_REGMAP_IRQ(27), IDI48_REGMAP_IRQ(28), IDI48_REGMAP_IRQ(29),
+	IDI48_REGMAP_IRQ(30), IDI48_REGMAP_IRQ(31), IDI48_REGMAP_IRQ(32),
+	IDI48_REGMAP_IRQ(33), IDI48_REGMAP_IRQ(34), IDI48_REGMAP_IRQ(35),
+	IDI48_REGMAP_IRQ(36), IDI48_REGMAP_IRQ(37), IDI48_REGMAP_IRQ(38),
+	IDI48_REGMAP_IRQ(39), IDI48_REGMAP_IRQ(40), IDI48_REGMAP_IRQ(41),
+	IDI48_REGMAP_IRQ(42), IDI48_REGMAP_IRQ(43), IDI48_REGMAP_IRQ(44),
+	IDI48_REGMAP_IRQ(45), IDI48_REGMAP_IRQ(46), IDI48_REGMAP_IRQ(47),
+};
+
 static const char *idi48_names[IDI48_NGPIO] = {
 	"Bit 0 A", "Bit 1 A", "Bit 2 A", "Bit 3 A", "Bit 4 A", "Bit 5 A",
 	"Bit 6 A", "Bit 7 A", "Bit 8 A", "Bit 9 A", "Bit 10 A", "Bit 11 A",
@@ -228,75 +120,58 @@ static const char *idi48_names[IDI48_NGPIO] = {
 	"Bit 18 B", "Bit 19 B", "Bit 20 B", "Bit 21 B", "Bit 22 B", "Bit 23 B"
 };
 
-static int idi_48_irq_init_hw(struct gpio_chip *gc)
-{
-	struct idi_48_gpio *const idi48gpio = gpiochip_get_data(gc);
-
-	/* Disable IRQ by default */
-	iowrite8(0, &idi48gpio->reg->irq);
-	ioread8(&idi48gpio->reg->irq);
-
-	return 0;
-}
-
 static int idi_48_probe(struct device *dev, unsigned int id)
 {
-	struct idi_48_gpio *idi48gpio;
 	const char *const name = dev_name(dev);
-	struct gpio_irq_chip *girq;
+	struct gpio_regmap_config config = {0};
+	void __iomem *regs;
+	struct regmap_irq_chip *chip;
+	struct regmap_irq_chip_data *chip_data;
 	int err;
 
-	idi48gpio = devm_kzalloc(dev, sizeof(*idi48gpio), GFP_KERNEL);
-	if (!idi48gpio)
-		return -ENOMEM;
-
 	if (!devm_request_region(dev, base[id], IDI_48_EXTENT, name)) {
 		dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
 			base[id], base[id] + IDI_48_EXTENT);
 		return -EBUSY;
 	}
 
-	idi48gpio->reg = devm_ioport_map(dev, base[id], IDI_48_EXTENT);
-	if (!idi48gpio->reg)
+	regs = devm_ioport_map(dev, base[id], IDI_48_EXTENT);
+	if (!regs)
 		return -ENOMEM;
 
-	idi48gpio->chip.label = name;
-	idi48gpio->chip.parent = dev;
-	idi48gpio->chip.owner = THIS_MODULE;
-	idi48gpio->chip.base = -1;
-	idi48gpio->chip.ngpio = IDI48_NGPIO;
-	idi48gpio->chip.names = idi48_names;
-	idi48gpio->chip.get_direction = idi_48_gpio_get_direction;
-	idi48gpio->chip.direction_input = idi_48_gpio_direction_input;
-	idi48gpio->chip.get = idi_48_gpio_get;
-	idi48gpio->chip.get_multiple = idi_48_gpio_get_multiple;
+	config.regmap = devm_regmap_init_mmio(dev, regs, &idi48_regmap_config);
+	if (IS_ERR(config.regmap))
+		return PTR_ERR(config.regmap);
 
-	girq = &idi48gpio->chip.irq;
-	gpio_irq_chip_set_chip(girq, &idi_48_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 = idi_48_irq_init_hw;
+	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
 
-	spin_lock_init(&idi48gpio->lock);
+	chip->name = name;
+	chip->status_base = IDI48_IRQ_REG;
+	chip->unmask_base = IDI48_IRQ_REG;
+	chip->clear_on_unmask = true;
+	chip->num_regs = 1;
+	chip->irqs = idi48_regmap_irqs;
+	chip->num_irqs = ARRAY_SIZE(idi48_regmap_irqs);
+
+	err = devm_regmap_add_irq_chip(dev, config.regmap, irq[id], IRQF_SHARED,
+				       0, chip, &chip_data);
 
-	err = devm_gpiochip_add_data(dev, &idi48gpio->chip, idi48gpio);
 	if (err) {
-		dev_err(dev, "GPIO registering failed (%d)\n", err);
+		dev_err(dev, "IRQ registration failed (%d)\n", err);
 		return err;
 	}
 
-	err = devm_request_irq(dev, irq[id], idi_48_irq_handler, IRQF_SHARED,
-		name, idi48gpio);
-	if (err) {
-		dev_err(dev, "IRQ handler registering failed (%d)\n", err);
-		return err;
-	}
+	config.parent = dev;
+	config.ngpio = IDI48_NGPIO;
+	config.names = idi48_names;
+	config.reg_dat_base = GPIO_REGMAP_ADDR(0x0);
+	config.ngpio_per_reg = 8;
+	config.reg_mask_xlate = idi_48_reg_mask_xlate;
+	config.irq_domain = regmap_irq_get_domain(chip_data);
 
-	return 0;
+	return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(dev, &config));
 }
 
 static struct isa_driver idi_48_driver = {
