AngularJs: How to get the attribute value of a attribute type directive

I have a custom directive called my-directive which is of attribute type (restrict: 'A'). I use it as follows:

<input my-directive="mydvalue"/>

How do i get the "mydvalue" inside the directive?

app.directive("myDirective", function (){
   return {
      restrict: 'A',
      link: function(scope, el, attrs, controller) {
         //How do i get the mydvalue here.

      }

  };

});