As ->to_irq is redefined in gpiochip_add_irqchip, having it defined in
driver is useless, so let's drop it.

Also i think it is worth to give a gentle warning in
gpiochip_add_irqchip, to prevent people relying on to_irq.

For example

WARN_ON_ONCE(gc->to_irq,
"to_irq is redefined in gpiochip_add_irqchip" \
"and you shouldn't rely on it\n");

Signed-off-by: Nikita Shubin <nikita.shu...@maquefel.me>
---
 drivers/gpio/gpio-ep93xx.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/gpio/gpio-ep93xx.c b/drivers/gpio/gpio-ep93xx.c
index d6db0ff16581..90afe07213ce 100644
--- a/drivers/gpio/gpio-ep93xx.c
+++ b/drivers/gpio/gpio-ep93xx.c
@@ -325,11 +325,6 @@ static int ep93xx_gpio_set_config(struct gpio_chip *gc, 
unsigned offset,
        return 0;
 }
 
-static int ep93xx_gpio_f_to_irq(struct gpio_chip *gc, unsigned offset)
-{
-       return EP93XX_GPIO_F_IRQ_BASE + offset;
-}
-
 static int ep93xx_gpio_add_ab_irq_chip(struct gpio_chip *gc,
                                        struct platform_device *pdev,
                                        struct ep93xx_irq_chip *eic,
@@ -407,7 +402,6 @@ static int ep93xx_gpio_add_f_irq_chip(struct gpio_chip *gc,
        }
        girq->default_type = IRQ_TYPE_NONE;
        girq->handler = handle_level_irq;
-       gc->to_irq = ep93xx_gpio_f_to_irq;
 
        return 0;
 }
-- 
2.26.2

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