P50_GPIO_LINE_BTN
PROPERTY_ENTRY_GPIO("gpios", &gpiochip_node, P50_GPIO_LINE_BTN, GPIO_ACTIVE_LOW),
case P50_GPIO_LINE_BTN:
[P50_GPIO_LINE_BTN] = P50_MBOX_PARAM_BTN,
[P50_GPIO_LINE_BTN] = "identify-button",