41 lines
1.0 KiB
Plaintext
41 lines
1.0 KiB
Plaintext
|
|
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");
|