To the best of my knowledge the welder could weld using uphill or the down hill progression as long he was qualified.
Generally the WPS is qualified using uphill progression, but again, it would depend on the specifics of the WPS.
Al
There is a common belief among welders that one progression is "worse" than others or that some codes restrict the use of downhill or uphill altogether.
ASME Sec. IX does not prohibit downhill nor do any of the codes of construction. API 1104 does NOT prohibit uphill welding.
As with all welding in accordance with a code, the things that are required are a WPS qualified for the production joint and a welder qualified for the production joint. They both must overlap for what is done on THAT specific weld and that's it.
Procedures are not "industry-wide" as each company is responsible for their own in almost all cases.
The documentation that supports uphill or downhill is the code that applies to the work that you are doing. Unfortunately, as a welder, you may often never see the secret "documentation" as sometimes it doesn't exist or is in control of the all powerful and all knowing QC inspector.
Have a good one.