mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-30 00:21:06 +00:00
48b3ecbedf
The gpio_hog_probe_all() functionality can be perfectly well replaced by DM_FLAG_PROBE_AFTER_BIND DM flag, which would trigger .probe() callback of each GPIO hog driver instance after .bind() and thus configure the hogged GPIO accordingly. Signed-off-by: Marek Vasut <marex@denx.de> Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com> Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com> Reviewed-by: Samuel Holland <samuel@sholland.org>
40 lines
1 KiB
Text
40 lines
1 KiB
Text
|
|
GPIO hog (CONFIG_GPIO_HOG)
|
|
--------
|
|
|
|
All the GPIO hog are initialized using DM_FLAG_PROBE_AFTER_BIND DM flag
|
|
after bind().
|
|
|
|
Example, for the device tree:
|
|
|
|
tca6416@20 {
|
|
compatible = "ti,tca6416";
|
|
reg = <0x20>;
|
|
#gpio-cells = <2>;
|
|
gpio-controller;
|
|
|
|
env_reset {
|
|
gpio-hog;
|
|
input;
|
|
gpios = <6 GPIO_ACTIVE_LOW>;
|
|
};
|
|
boot_rescue {
|
|
gpio-hog;
|
|
input;
|
|
line-name = "foo-bar-gpio";
|
|
gpios = <7 GPIO_ACTIVE_LOW>;
|
|
};
|
|
};
|
|
|
|
You can than access the gpio in your board code with:
|
|
|
|
struct gpio_desc *desc;
|
|
int ret;
|
|
|
|
ret = gpio_hog_lookup_name("boot_rescue", &desc);
|
|
if (ret)
|
|
return;
|
|
if (dm_gpio_get_value(desc) == 1)
|
|
printf("\nBooting into Rescue System\n");
|
|
else if (dm_gpio_get_value(desc) == 0)
|
|
printf("\nBoot normal\n");
|