diff options
| author | Alexandre Courbot <acourbot@nvidia.com> | 2013-11-23 11:34:50 +0100 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2013-12-03 13:10:48 +0100 |
| commit | 35c5d7fdc4eed4409f9193bf7651315849cc6aa3 (patch) | |
| tree | 66c2782a2c9dd545d8ec1d094d3c3bb00dd1c267 /drivers/gpio/gpiolib.c | |
| parent | Documentation: gpiolib: add 00-INDEX file (diff) | |
| download | linux-35c5d7fdc4eed4409f9193bf7651315849cc6aa3.tar.xz linux-35c5d7fdc4eed4409f9193bf7651315849cc6aa3.zip | |
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: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to '')
| -rw-r--r-- | drivers/gpio/gpiolib.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index b73c39f99858..dbddace5df42 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -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)) { |