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| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2020-02-20 14:01:49 +0100 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2020-02-21 17:10:33 +0100 |
| commit | 63636d956c455c0fbe2118078a03f563ddd6bf6e (patch) | |
| tree | c84d484227fdb545f3d82646c2f7f296fa3049bc /drivers/gpio/gpiolib.h | |
| parent | gpio: of: Extract of_gpiochip_add_hog() (diff) | |
| download | linux-63636d956c455c0fbe2118078a03f563ddd6bf6e.tar.xz linux-63636d956c455c0fbe2118078a03f563ddd6bf6e.zip | |
gpio: of: Add DT overlay support for GPIO hogs
As GPIO hogs are configured at GPIO controller initialization time,
adding/removing GPIO hogs in DT overlays does not work.
Add support for GPIO hogs described in DT overlays by registering an OF
reconfiguration notifier, to handle the addition and removal of GPIO hog
subnodes to/from a GPIO controller device node.
Note that when a GPIO hog device node is being removed, its "gpios"
properties is no longer available, so we have to keep track of which
node a hog belongs to, which is done by adding a pointer to the hog's
device node to struct gpio_desc.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20200220130149.26283-3-geert+renesas@glider.be
Reviewed-by: Frank Rowand <frank.rowand@sony.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to '')
| -rw-r--r-- | drivers/gpio/gpiolib.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h index 5ab90746b519..853ce681b4a4 100644 --- a/drivers/gpio/gpiolib.h +++ b/drivers/gpio/gpiolib.h @@ -120,6 +120,9 @@ struct gpio_desc { const char *label; /* Name of the GPIO */ const char *name; +#ifdef CONFIG_OF_DYNAMIC + struct device_node *hog; +#endif }; int gpiod_request(struct gpio_desc *desc, const char *label); |