Promotion.php

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<?php
namespace Magento\Catalog\Block\Product\ProductList;

use Magento\Catalog\Api\CategoryRepositoryInterface;
use Magento\Catalog\Model\ResourceModel\Product\Collection;
use Magento\Catalog\Model\ResourceModel\Product\CollectionFactory;

class Promotion extends \Magento\Catalog\Block\Product\ListProduct
{
    protected $_productCollectionFactory;

    protected $categoryRepository;

    public function __construct(
        \Magento\Catalog\Block\Product\Context $context,
        \Magento\Framework\Data\Helper\PostHelper $postDataHelper,
        \Magento\Catalog\Model\Layer\Resolver $layerResolver,
        CategoryRepositoryInterface $categoryRepository,
        \Magento\Framework\Url\Helper\Data $urlHelper,
        CollectionFactory $productCollectionFactory,
        array $data = []
    ) {
        $this->_productCollectionFactory = $productCollectionFactory;
        parent::__construct(
            $context,
            $postDataHelper,
            $layerResolver,
            $categoryRepository,
            $urlHelper,
            $data
        );
    }

    protected function _getProductCollection()
    {
        if ($this->_productCollection === null) {
            $collection = $this->_productCollectionFactory->create();
            $this->_catalogLayer->prepareProductCollection($collection);

            $collection->addAttributeToFilter('promotion', 1)->addStoreFilter();

            $this->_productCollection = $collection;
        }
        return $this->_productCollection;
    }
}