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gpio: Add helpers for optional GPIOs

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Introduce gpiod_get_optional() and gpiod_get_index_optional() helpers
that make it easier for drivers to handle optional GPIOs.

Currently in order to handle optional GPIOs, a driver needs to special
case error handling for -ENOENT, such as this:

	gpio = gpiod_get(dev, "foo");
	if (IS_ERR(gpio)) {
		if (PTR_ERR(gpio) != -ENOENT)
			return PTR_ERR(gpio);

		gpio = NULL;
	}

	if (gpio) {
		/* set up GPIO */
	}

With these new helpers the above is reduced to:

	gpio = gpiod_get_optional(dev, "foo");
	if (IS_ERR(gpio))
		return PTR_ERR(gpio);

	if (gpio) {
		/* set up GPIO */
	}

While at it, device-managed variants of these functions are also
provided.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Thierry Reding 2014-04-25 17:10:06 +02:00 • committed by Linus Walleij
parent 91329132c9
commit 29a1f2333e
4 changed files with 128 additions and 0 deletions
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2
Documentation/driver-model/devres.txt
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@ -312,4 +312,6 @@ SPI
GPIO
devm_gpiod_get()
devm_gpiod_get_index()
devm_gpiod_get_optional()
devm_gpiod_get_index_optional()
devm_gpiod_put()