What legal obligations exist for landlord access to rented premises?

In the event, if the parties to the deed have predetermined and agreed upon the manner of notifying for inspection of the tenanted premises then, you (as landlord) must address a prior notice (as per the agreed mode of communication).

What legal obligations exist for landlord access to rented premises?
In the event, if the parties to the deed have predetermined and agreed upon the manner of notifying for inspection of the tenanted premises then, you (as landlord) must address a prior notice (as per the agreed mode of communication).