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gpio: mxc: add generic gpio request/free callbacks to pinctrl
If a GPIO controller description in board DTB contains information about mappings between GPIOs and pads under IOMUX control use it to request and free GPIOs with respect to pinctrl/pinmux subsystems. One of immediate positive functional changes is inability to request non-existing GPIOs, i.e. if there is no pad such. Also pinctrl/pinmux may now properly account pads occupied by requested GPIOs. The change has no effect, if "gpio-ranges" property is not found including the case if a board has no DTB firmware. Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> Acked-by: Shawn Guo <shawnguo@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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@ -458,6 +458,11 @@ static int mxc_gpio_probe(struct platform_device *pdev)
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if (err)
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goto out_bgio;
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if (of_property_read_bool(np, "gpio-ranges")) {
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port->gc.request = gpiochip_generic_request;
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port->gc.free = gpiochip_generic_free;
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}
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port->gc.to_irq = mxc_gpio_to_irq;
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port->gc.base = (pdev->id < 0) ? of_alias_get_id(np, "gpio") * 32 :
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pdev->id * 32;
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