====== Device Tree ======

DTS, DTB, DTC

===== empty pinctrl phandle =====

To mute warning from U-Boot fastboot command that ''Failed to configure default pinctrl''
it is possible to define ''pinctrl'' and point it to nothing:

<code c>
	device {
		pinctrl-names = "active", "idle";
		pinctrl-0 = <>;
		pinctrl-1 = <>;
	};
</code>