Commit 4c806c98 authored Sep 08, 2016 by Vladimir Zapolskiy Committed by Linus Walleij Sep 12, 2016

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>

parent e188cbf7

drivers/gpio/gpio-mxc.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -458,6 +458,11 @@ static int mxc_gpio_probe(struct platform_device *pdev)
		if (err)
		goto out_bgio;

		if (of_property_read_bool(np, "gpio-ranges")) {
		port->gc.request = gpiochip_generic_request;
		port->gc.free = gpiochip_generic_free;
		}

		port->gc.to_irq = mxc_gpio_to_irq;
		port->gc.base = (pdev->id < 0) ? of_alias_get_id(np, "gpio") * 32 :
		pdev->id * 32;