gpio: remove the obsolete MX35 3DS BOARD MC9S08DZ60 GPIO functions

Commit e1324ece ("ARM: imx: Remove i.MX35 board files") removes the
config MACH_MX35_3DS in arch/arm/mach-imx/Kconfig.

Hence, since then, the MX35 3DS BOARD MC9S08DZ60 GPIO functions are dead
code as its config GPIO_MC9S08DZ60 depends on the config MACH_MX35_3DS.

Luckily, ./scripts/checkkconfigsymbols.py warns on non-existing configs:

MACH_MX35_3DS
Referencing files: drivers/gpio/Kconfig

Remove the obsolete MX35 3DS BOARD MC9S08DZ60 GPIO functions.
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

drivers/gpio/Kconfig

@@ -1010,12 +1010,6 @@ config GPIO_MAX732X_IRQ
 	  Say yes here to enable the max732x to be used as an interrupt
 	  controller. It requires the driver to be built in the kernel.
 
-config GPIO_MC9S08DZ60
-	bool "MX35 3DS BOARD MC9S08DZ60 GPIO functions"
-	depends on I2C=y && MACH_MX35_3DS
-	help
-	  Select this to enable the MC9S08DZ60 GPIO driver
-
 config GPIO_PCA953X
 	tristate "PCA95[357]x, PCA9698, TCA64xx, and MAX7310 I/O ports"
 	select REGMAP_I2C

drivers/gpio/Makefile

@@ -92,7 +92,6 @@ obj-$(CONFIG_GPIO_MAX77620)		+= gpio-max77620.o
 obj-$(CONFIG_GPIO_MAX77650)		+= gpio-max77650.o
 obj-$(CONFIG_GPIO_MB86S7X)		+= gpio-mb86s7x.o
 obj-$(CONFIG_GPIO_MC33880)		+= gpio-mc33880.o
-obj-$(CONFIG_GPIO_MC9S08DZ60)		+= gpio-mc9s08dz60.o
 obj-$(CONFIG_GPIO_MENZ127)		+= gpio-menz127.o
 obj-$(CONFIG_GPIO_MERRIFIELD)		+= gpio-merrifield.o
 obj-$(CONFIG_GPIO_ML_IOH)		+= gpio-ml-ioh.o

drivers/gpio/gpio-mc9s08dz60.c

-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright 2009-2012 Freescale Semiconductor, Inc. All Rights Reserved.
- *
- * Author: Wu Guoxing <b39297@freescale.com>
- */
-
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/i2c.h>
-#include <linux/gpio/driver.h>
-
-#define GPIO_GROUP_NUM 2
-#define GPIO_NUM_PER_GROUP 8
-#define GPIO_NUM (GPIO_GROUP_NUM*GPIO_NUM_PER_GROUP)
-
-struct mc9s08dz60 {
-	struct i2c_client *client;
-	struct gpio_chip chip;
-};
-
-static void mc9s_gpio_to_reg_and_bit(int offset, u8 *reg, u8 *bit)
-{
-	*reg = 0x20 + offset / GPIO_NUM_PER_GROUP;
-	*bit = offset % GPIO_NUM_PER_GROUP;
-}
-
-static int mc9s08dz60_get_value(struct gpio_chip *gc, unsigned offset)
-{
-	u8 reg, bit;
-	s32 value;
-	struct mc9s08dz60 *mc9s = gpiochip_get_data(gc);
-
-	mc9s_gpio_to_reg_and_bit(offset, &reg, &bit);
-	value = i2c_smbus_read_byte_data(mc9s->client, reg);
-
-	return (value >= 0) ? (value >> bit) & 0x1 : 0;
-}
-
-static int mc9s08dz60_set(struct mc9s08dz60 *mc9s, unsigned offset, int val)
-{
-	u8 reg, bit;
-	s32 value;
-
-	mc9s_gpio_to_reg_and_bit(offset, &reg, &bit);
-	value = i2c_smbus_read_byte_data(mc9s->client, reg);
-	if (value >= 0) {
-		if (val)
-			value |= 1 << bit;
-		else
-			value &= ~(1 << bit);
-
-		return i2c_smbus_write_byte_data(mc9s->client, reg, value);
-	} else
-		return value;
-
-}
-
-
-static void mc9s08dz60_set_value(struct gpio_chip *gc, unsigned offset, int val)
-{
-	struct mc9s08dz60 *mc9s = gpiochip_get_data(gc);
-
-	mc9s08dz60_set(mc9s, offset, val);
-}
-
-static int mc9s08dz60_direction_output(struct gpio_chip *gc,
-				       unsigned offset, int val)
-{
-	struct mc9s08dz60 *mc9s = gpiochip_get_data(gc);
-
-	return mc9s08dz60_set(mc9s, offset, val);
-}
-
-static int mc9s08dz60_probe(struct i2c_client *client,
-			    const struct i2c_device_id *id)
-{
-	struct mc9s08dz60 *mc9s;
-
-	mc9s = devm_kzalloc(&client->dev, sizeof(*mc9s), GFP_KERNEL);
-	if (!mc9s)
-		return -ENOMEM;
-
-	mc9s->chip.label = client->name;
-	mc9s->chip.base = -1;
-	mc9s->chip.parent = &client->dev;
-	mc9s->chip.owner = THIS_MODULE;
-	mc9s->chip.ngpio = GPIO_NUM;
-	mc9s->chip.can_sleep = true;
-	mc9s->chip.get = mc9s08dz60_get_value;
-	mc9s->chip.set = mc9s08dz60_set_value;
-	mc9s->chip.direction_output = mc9s08dz60_direction_output;
-	mc9s->client = client;
-	i2c_set_clientdata(client, mc9s);
-
-	return devm_gpiochip_add_data(&client->dev, &mc9s->chip, mc9s);
-}
-
-static const struct i2c_device_id mc9s08dz60_id[] = {
-	{"mc9s08dz60", 0},
-	{},
-};
-
-static struct i2c_driver mc9s08dz60_i2c_driver = {
-	.driver = {
-		.name = "mc9s08dz60",
-	},
-	.probe = mc9s08dz60_probe,
-	.id_table = mc9s08dz60_id,
-};
-builtin_i2c_driver(mc9s08dz60_i2c_driver);