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| author | Stefan Wahren <stefan.wahren@i2se.com> | 2022-04-09 12:51:28 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-06-09 11:21:15 +0300 |
| commit | cda45b715d7052c23c2eb1c270023f758b209b16 (patch) | |
| tree | ebba7c2274ea2d60a853bfc0bfd31935157ad7a3 /include | |
| parent | a26dfdf0a63b23c105f6f19abea16437056df990 (diff) | |
| download | linux-cda45b715d7052c23c2eb1c270023f758b209b16.tar.xz | |
gpiolib: of: Introduce hook for missing gpio-ranges
[ Upstream commit 3550bba25d5587a701e6edf20e20984d2ee72c78 ]
Since commit 2ab73c6d8323 ("gpio: Support GPIO controllers without pin-ranges")
the device tree nodes of GPIO controller need the gpio-ranges property to
handle gpio-hogs. Unfortunately it's impossible to guarantee that every new
kernel is shipped with an updated device tree binary.
In order to provide backward compatibility with those older DTB, we need a
callback within of_gpiochip_add_pin_range() so the relevant platform driver
can handle this case.
Fixes: 2ab73c6d8323 ("gpio: Support GPIO controllers without pin-ranges")
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Bartosz Golaszewski <brgl@bgdev.pl>
Link: https://lore.kernel.org/r/20220409095129.45786-2-stefan.wahren@i2se.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/gpio/driver.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h index b216899b4745..0552a9859a01 100644 --- a/include/linux/gpio/driver.h +++ b/include/linux/gpio/driver.h @@ -477,6 +477,18 @@ struct gpio_chip { */ int (*of_xlate)(struct gpio_chip *gc, const struct of_phandle_args *gpiospec, u32 *flags); + + /** + * @of_gpio_ranges_fallback: + * + * Optional hook for the case that no gpio-ranges property is defined + * within the device tree node "np" (usually DT before introduction + * of gpio-ranges). So this callback is helpful to provide the + * necessary backward compatibility for the pin ranges. + */ + int (*of_gpio_ranges_fallback)(struct gpio_chip *gc, + struct device_node *np); + #endif /* CONFIG_OF_GPIO */ }; |