For example, a lot of cities have the city open data, such as http://data.vancouver.ca/datacatalogue/index.htm.

And many city datasets are with geo locations. Such as public washrooms etc. Instead of let the user add one spot one time manually to open street.

Does open street allow csv files uploading or does open street map has an input api that users/developers can submit data through?

If not yet, does open street map have projects or plans to develop these input features?