gpio: mb86s70: Return error if requesting an already assigned gpio
Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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@ -58,6 +58,11 @@ static int mb86s70_gpio_request(struct gpio_chip *gc, unsigned gpio)
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spin_lock_irqsave(&gchip->lock, flags);
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val = readl(gchip->base + PFR(gpio));
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if (!(val & OFFSET(gpio))) {
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spin_unlock_irqrestore(&gchip->lock, flags);
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return -EINVAL;
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}
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val &= ~OFFSET(gpio);
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writel(val, gchip->base + PFR(gpio));
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