34  * to turn on the LED whenever the button is pressed.
36 static struct gpio_dt_spec led = GPIO_DT_SPEC_GET_OR(DT_ALIAS(led0), gpios,  variable
74 	if (led.port && !gpio_is_ready_dt(&led)) {  in main()
75 		printk("Error %d: LED device %s is not ready; ignoring it\n",  in main()
76 		       ret, led.port->name);  in main()
77 		led.port = NULL;  in main()
79 	if (led.port) {  in main()
80 		ret = gpio_pin_configure_dt(&led, GPIO_OUTPUT);  in main()
82 			printk("Error %d: failed to configure LED device %s pin %d\n",  in main()
83 			       ret, led.port->name, led.pin);  in main()
84 			led.port = NULL;  in main()
86 			printk("Set up LED at %s pin %d\n", led.port->name, led.pin);  in main()
91 	if (led.port) {  in main()
93 			/* If we have an LED, match its state to the button's. */  in main()
97 				gpio_pin_set_dt(&led, val);  in main()