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Commit 35c5d7fd authored by Alexandre Courbot's avatar Alexandre Courbot Committed by Linus Walleij
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gpiolib: use platform GPIO mappings as fallback 



For platforms that use device tree or ACPI as the standard way to look
GPIOs up, allow the platform-defined GPIO mappings to be used as a
fallback. This may be useful for platforms that need extra GPIOs mappings
not defined by the firmware.

Signed-off-by: default avatarAlexandre Courbot <acourbot@nvidia.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 56a39aac

drivers/gpio/gpiolib.c

+13 −3
Original line number Diff line number Diff line
@@ -2418,7 +2418,7 @@ struct gpio_desc *__must_check gpiod_get_index(struct device *dev, 
					       const char *con_id,

					       unsigned int idx)

{

	struct gpio_desc *desc;

	struct gpio_desc *desc = NULL;

	int status;

	enum gpio_lookup_flags flags = 0;
@@ -2431,9 +2431,19 @@ struct gpio_desc *__must_check gpiod_get_index(struct device *dev, 
	} else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev)) {

		dev_dbg(dev, "using ACPI for GPIO lookup\n");

		desc = acpi_find_gpio(dev, con_id, idx, &flags);

	} else {

	}



	/*

	 * Either we are not using DT or ACPI, or their lookup did not return

	 * a result. In that case, use platform lookup as a fallback.

	 */

	if (!desc || IS_ERR(desc)) {

		struct gpio_desc *pdesc;

		dev_dbg(dev, "using lookup tables for GPIO lookup");

		desc = gpiod_find(dev, con_id, idx, &flags);

		pdesc = gpiod_find(dev, con_id, idx, &flags);

		/* If used as fallback, do not replace the previous error */

		if (!IS_ERR(pdesc) || !desc)

			desc = pdesc;

	}



	if (IS_ERR(desc)) {