If you want landscape and portrait enabled on iPad, but only portrait on iPhone/iPod, then you've come to the right place. Add this plugin and set orientation to portrait, this plugin will add landscape orientation for iPad only.
More information could be available on the GitHub README.

Installation is done via the Cordova CLI.

Install iPad Landscape Enabler using the latest version from GitHub:

$ cordova plugin add https://github.com/EddyVerbruggen/iPadLandscapeEnabler-PhoneGapBuild-Plugin.git

Supported Platforms
  • Android
  • BlackBerry 10
  • Fire OS
  • Firefox OS
  • iOS
  • Ubuntu
  • Windows 8
  • Windows Phone 7
  • Windows Phone 8
Supported Engines
  • cordova