mod.addon_name.php

<?php

class Addon_name {

	public function __construct()
	{
		$this->EE->load->add_package_path(PATH_THIRD . 'channel_data');
		$this->EE->load->driver('channeldata', array(
			'directories' => array(
				PATH_THIRD . 'addon_name/models'
			)
		));
	}

	public function school()
	{
		return School::where('channel_titles.entry_id', '=', ee()->TMPL->fetch_param('school_entry_id'))
			     ->get()
			     ->entries();
	}
	
}

template.html

{exp:addon_name:school prefix="school:"}

	{if school:no_results}
	   <p>No school exists</p>
	{/if}

	{school:url_title}

	{school:some_matrix_field}

		{some_col_1}

		{some_col_2}

	{/school:some_matrix_field}


{/exp:addon_name:school}