This just some chat, but at least it's by some of the more reliable sources.
He had surgery, but allegedly, it was a minor procedure.
He should be fine for fall camp.
I'm no medical doctor, but the injury were a high ankle sprain, then this kind of procedure takes about 3 months before you can do any "cutting" sports such as football, tennis, etc.
Right now, we're in a really good area with the safety position, especially when your second stringer (Luke Talich) would be a starter at most other programs.
Link: https://slapthesign.com/notre-dame-football-joey-obrien-surgery-injury-update
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