gpio: spacemit-k1: use new generic GPIO chip API

Convert the driver to using the new generic GPIO chip interfaces from
linux/gpio/generic.h.

Reviewed-by: Yixun Lan <dlan@gentoo.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250910-gpio-mmio-gpio-conv-part4-v2-12-f3d1a4c57124@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Author: Bartosz Golaszewski

drivers/gpio/gpio-spacemit-k1.c

@@ -6,6 +6,7 @@
 
 #include <linux/clk.h>
 #include <linux/gpio/driver.h>
+#include <linux/gpio/generic.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
@@ -38,7 +39,7 @@
 struct spacemit_gpio;
 
 struct spacemit_gpio_bank {
-	struct gpio_chip gc;
+	struct gpio_generic_chip chip;
 	struct spacemit_gpio *sg;
 	void __iomem *base;
 	u32 irq_mask;
@@ -72,7 +73,7 @@ static irqreturn_t spacemit_gpio_irq_handler(int irq, void *dev_id)
 		return IRQ_NONE;
 
 	for_each_set_bit(n, &pending, BITS_PER_LONG)
-		handle_nested_irq(irq_find_mapping(gb->gc.irq.domain, n));
+		handle_nested_irq(irq_find_mapping(gb->chip.gc.irq.domain, n));
 
 	return IRQ_HANDLED;
 }
@@ -143,7 +144,7 @@ static void spacemit_gpio_irq_print_chip(struct irq_data *data, struct seq_file
 {
 	struct spacemit_gpio_bank *gb = irq_data_get_irq_chip_data(data);
 
-	seq_printf(p, "%s-%d", dev_name(gb->gc.parent), spacemit_gpio_bank_index(gb));
+	seq_printf(p, "%s-%d", dev_name(gb->chip.gc.parent), spacemit_gpio_bank_index(gb));
 }
 
 static struct irq_chip spacemit_gpio_chip = {
@@ -165,15 +166,16 @@ static bool spacemit_of_node_instance_match(struct gpio_chip *gc, unsigned int i
 	if (i >= SPACEMIT_NR_BANKS)
 		return false;
 
-	return (gc == &sg->sgb[i].gc);
+	return (gc == &sg->sgb[i].chip.gc);
 }
 
 static int spacemit_gpio_add_bank(struct spacemit_gpio *sg,
 				  void __iomem *regs,
 				  int index, int irq)
 {
 	struct spacemit_gpio_bank *gb = &sg->sgb[index];
-	struct gpio_chip *gc = &gb->gc;
+	struct gpio_generic_chip_config config;
+	struct gpio_chip *gc = &gb->chip.gc;
 	struct device *dev = sg->dev;
 	struct gpio_irq_chip *girq;
 	void __iomem *dat, *set, *clr, *dirin, *dirout;
@@ -187,9 +189,19 @@ static int spacemit_gpio_add_bank(struct spacemit_gpio *sg,
 	dirin	= gb->base + SPACEMIT_GCDR;
 	dirout	= gb->base + SPACEMIT_GSDR;
 
+	config = (struct gpio_generic_chip_config) {
+		.dev = dev,
+		.sz = 4,
+		.dat = dat,
+		.set = set,
+		.clr = clr,
+		.dirout = dirout,
+		.dirin = dirin,
+		.flags = BGPIOF_UNREADABLE_REG_SET | BGPIOF_UNREADABLE_REG_DIR,
+	};
+
 	/* This registers 32 GPIO lines per bank */
-	ret = bgpio_init(gc, dev, 4, dat, set, clr, dirout, dirin,
-			 BGPIOF_UNREADABLE_REG_SET | BGPIOF_UNREADABLE_REG_DIR);
+	ret = gpio_generic_chip_init(&gb->chip, &config);
 	if (ret)
 		return dev_err_probe(dev, ret, "failed to init gpio chip\n");
 
@@ -221,7 +233,7 @@ static int spacemit_gpio_add_bank(struct spacemit_gpio *sg,
 	ret = devm_request_threaded_irq(dev, irq, NULL,
 					spacemit_gpio_irq_handler,
 					IRQF_ONESHOT | IRQF_SHARED,
-					gb->gc.label, gb);
+					gb->chip.gc.label, gb);
 	if (ret < 0)
 		return dev_err_probe(dev, ret, "failed to register IRQ\n");