Jetpack For Developers: Infinite Scroll example

infinite-scroll.php

<?php
function prefix_jetpack_setup(){
	add_theme_support( 'infinite-scroll', array(
		'type'           => 'click',
		'container'      => 'main',
		'posts_per_page' => 12,
		'footer'         => 'page',
		'render'         => 'prefix_is_render',
	) );
}

function prefix_is_render() {
	// Only needed if your loop is different than
	while( have_posts() ) : the_post();
		get_template_part( 'content', get_post_format() );
	endwhile;
}