"topic of discussion for" is correct and commonly used in written English.
It is typically used when introducing a subject that will be discussed or talked about. Example: The topic of discussion for today's staff meeting will be the new company policies.
"We're going to have hearings," Ryan told Fox News, suggesting the emails would remain a topic of discussion for weeks.
Skyscrapers were a frequent topic of discussion for Lewis Mumford, who succeeded Chappell as The New Yorker's architecture critic.
A flotation of the UK business has been a topic of discussion for the last four years.
The impact Snowden's presence might have on the relationship between the United States and Venezuela was a constant topic of discussion for both Chavistas and the opposition.
The faltering world economy was a primary topic of discussion for finance ministers from the seven leading industrial democracies meeting today in Rome.
It looks like Richard Jefferson got away with tripping Kevin Durant on that last possession, expect that to be a topic of discussion for a spell.
Mr. Buffett spoke at greater length Sunday about more traditional topics of discussion for Berkshire meetings.
The merits and sportsmanship towards Charlotte that this brings up are certainly topics of discussion for Orlando and Charlotte fans, especially if Dwyer plays a major role and Orlando wins.
That will be one of the topics of discussion for Wednesday's summit in Brussels as hundreds of thousands of refugees and migrants brave the seas and trek across the Balkan peninsula to reach the affluent countries of northern Europe.
After all, these are not comfortable topics of discussion for the formerly pro-choice real estate mogul who gets his military advice from Sunday morning talk shows and they make for far less entertaining stories than Trump's latest feud with a fellow candidate or television host.
This weekend, it would appear that one of the big topics of discussion for America's Sunday morning public affairs programs will be the recently released budget overview from the Trump White House.
