Wrapping proprietary nodes

I expect my device tree will have some proprietary, one-off devices in
it. Is it better to wrap these all up in one node:

	cisco {
		device1 {
			...
		};
		device2 {
			...
		};
	};

Or should they be specified one node at a time:

	cisco-device1 {
		...
	};
	cisco-device2 {
		...
	};

My inclination is for the former, but I'd prefer to follow existing usage,
if any.
-- 
David VL