gpio: vr41xx: Delete vr41xx_gpio_pullupdown() callback

This API is not used anywhere in the kernel and has remained
unused for years after being introduced.

Over time, we have developed a subsystem to deal with pin
control and this now managed pull up/down.

Delete the old and unused API. If this platform needs it,
we should implement a proper pin controller for it instead.

Cc: Yoichi Yuasa <yuasa@linux-mips.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Paul Burton <paul.burton@mips.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/mips/include/asm/vr41xx/giu.h

@@ -51,12 +51,4 @@ typedef enum {
 
 extern void vr41xx_set_irq_level(unsigned int pin, irq_level_t level);
 
-typedef enum {
-	GPIO_PULL_DOWN,
-	GPIO_PULL_UP,
-	GPIO_PULL_DISABLE,
-} gpio_pull_t;
-
-extern int vr41xx_gpio_pullupdown(unsigned int pin, gpio_pull_t pull);
-
 #endif /* __NEC_VR41XX_GIU_H */

drivers/gpio/gpio-vr41xx.c

@@ -371,44 +371,6 @@ static int giu_set_direction(struct gpio_chip *chip, unsigned pin, int dir)
 	return 0;
 }
 
-int vr41xx_gpio_pullupdown(unsigned int pin, gpio_pull_t pull)
-{
-	u16 reg, mask;
-	unsigned long flags;
-
-	if ((giu_flags & GPIO_HAS_PULLUPDOWN_IO) != GPIO_HAS_PULLUPDOWN_IO)
-		return -EPERM;
-
-	if (pin >= 15)
-		return -EINVAL;
-
-	mask = 1 << pin;
-
-	spin_lock_irqsave(&giu_lock, flags);
-
-	if (pull == GPIO_PULL_UP || pull == GPIO_PULL_DOWN) {
-		reg = giu_read(GIUTERMUPDN);
-		if (pull == GPIO_PULL_UP)
-			reg |= mask;
-		else
-			reg &= ~mask;
-		giu_write(GIUTERMUPDN, reg);
-
-		reg = giu_read(GIUUSEUPDN);
-		reg |= mask;
-		giu_write(GIUUSEUPDN, reg);
-	} else {
-		reg = giu_read(GIUUSEUPDN);
-		reg &= ~mask;
-		giu_write(GIUUSEUPDN, reg);
-	}
-
-	spin_unlock_irqrestore(&giu_lock, flags);
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(vr41xx_gpio_pullupdown);
-
 static int vr41xx_gpio_get(struct gpio_chip *chip, unsigned pin)
 {
 	u16 reg, mask;