It's really good you are thinking about this now. I wish I had.
I married a nice and good man, but it's difficult not to slide into roles and never come out of them - particularly when you take a long maternity leave.
Splitting the maternity leave is brilliant, if it's possible. I wish it had been around when I was off work as it will give your DH a much better idea of what needs to be done and also a stronger bond with your baby.
I actually found maternity leave mostly fine, apart from a few choice bits were DH was wondering about 2 weeks after DS was born when he could go back to his evening ( 7 -11) bridge class. I think I may have cried at that point - I cried at a lot of things though so it's hard to remember.
The crux point for me and in retrospect I would have handled it differently, was when I went back to work.
I was p/t but the worst type so 4 days week slightly shortened hours, with basically f/t expectations. I also did and still do all bar one of weekly pick ups and drop offs. I struggled along as best I could with a demanding job and pretty much all of the household chores, but things came to a head when I had medical problems about ttc DC2, and still seemed to be expected to manage everything at home and at work with a pretty demanding (aren't they all) toddler.
We resolved it in the end by my dropping hours and grade - my choice, but certainly a million miles away from when we first met as both earning the same in the same profession.
Will be interesting when DS goes to secondary as I'm planning to go back f/t then and there's no way I can pick up everything at that point so we'll need to discuss it again.
Anyway sorry long discourse - specific jobs are good and don't pick up his slack, shared parental leave if possible, renegotiate when you go back to work, p/t does mean to be fair you will do a bit more, but until your DC is old enough to go to school not a lot more as you'll be looking after your DC.
Good luck with it all.