eeprom: at24: remove the write-protect pin support

NVMEM framework is an interface for the at24 EEPROMs as well as for
other drivers, instead of passing the wp-gpios over the different
drivers each time, it would be better to pass it over the NVMEM
subsystem once and for all.

Removing the support for the write-protect pin after adding it to the
NVMEM subsystem.
Signed-off-by: Khouloud Touil <ktouil@baylibre.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

drivers/misc/eeprom/at24.c

@@ -9,7 +9,6 @@
 #include <linux/acpi.h>
 #include <linux/bitops.h>
 #include <linux/delay.h>
-#include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/init.h>
 #include <linux/jiffies.h>
@@ -89,8 +88,6 @@ struct at24_data {
 
 	struct nvmem_device *nvmem;
 
-	struct gpio_desc *wp_gpio;
-
 	/*
 	 * Some chips tie up multiple I2C addresses; dummy devices reserve
 	 * them for us, and we'll use them with SMBus calls.
@@ -457,12 +454,10 @@ static int at24_write(void *priv, unsigned int off, void *val, size_t count)
 	 * from this host, but not from other I2C masters.
 	 */
 	mutex_lock(&at24->lock);
-	gpiod_set_value_cansleep(at24->wp_gpio, 0);
 
 	while (count) {
 		ret = at24_regmap_write(at24, buf, off, count);
 		if (ret < 0) {
-			gpiod_set_value_cansleep(at24->wp_gpio, 1);
 			mutex_unlock(&at24->lock);
 			pm_runtime_put(dev);
 			return ret;
@@ -472,7 +467,6 @@ static int at24_write(void *priv, unsigned int off, void *val, size_t count)
 		count -= ret;
 	}
 
-	gpiod_set_value_cansleep(at24->wp_gpio, 1);
 	mutex_unlock(&at24->lock);
 
 	pm_runtime_put(dev);
@@ -662,9 +656,6 @@ static int at24_probe(struct i2c_client *client)
 	at24->client[0].client = client;
 	at24->client[0].regmap = regmap;
 
-	at24->wp_gpio = devm_gpiod_get_optional(dev, "wp", GPIOD_OUT_HIGH);
-	if (IS_ERR(at24->wp_gpio))
-		return PTR_ERR(at24->wp_gpio);
 
 	writable = !(flags & AT24_FLAG_READONLY);
 	if (writable) {