Using Custom Logo with Genesis via Customizer

custom-logo.php

<?php

add_theme_support( 'custom-logo', array(
	'height'      => 240, // set to your dimensions
	'width'       => 240,
	'flex-height' => true,
	'flex-width'  => true,
) );

output-logo.php

<?php

/**
 * Add an image inline in the site title element for the main logo
 *
 * The custom logo is then added via the Customiser
 *
 * @param string $title All the mark up title.
 * @param string $inside Mark up inside the title.
 * @param string $wrap Mark up on the title.
 * @author @_AlphaBlossom
 * @author @_neilgee
 */
function genesischild_custom_logo( $title, $inside, $wrap ) {
	// Check to see if the Custom Logo function exists and set what goes inside the wrapping tags.
	if ( function_exists( 'has_custom_logo' ) && has_custom_logo() ) :
		$logo = get_custom_logo();
	else :
	 	$logo = get_bloginfo( 'name' );
	endif;
 	 // Use this wrap if no custom logo - wrap around the site name
	 $inside = sprintf( '<a href="%s" title="%s">%s</a>', trailingslashit( home_url() ), esc_attr( get_bloginfo( 'name' ) ), $logo );
	 // Determine which wrapping tags to use - changed is_home to is_front_page to fix Genesis bug.
	 $wrap = is_front_page() && 'title' === genesis_get_seo_option( 'home_h1_on' ) ? 'h1' : 'p';
	 // A little fallback, in case an SEO plugin is active - changed is_home to is_front_page to fix Genesis bug.
	 $wrap = is_front_page() && ! genesis_get_seo_option( 'home_h1_on' ) ? 'h1' : $wrap;
	 // And finally, $wrap in h1 if HTML5 & semantic headings enabled.
	 $wrap = genesis_html5() && genesis_get_seo_option( 'semantic_headings' ) ? 'h1' : $wrap;
	 $title = sprintf( '<%1$s %2$s>%3$s</%1$s>', $wrap, genesis_attr( 'site-title' ), $inside );
	 return $title;
}
add_filter( 'genesis_seo_title','genesischild_custom_logo', 10, 3 );


/**
 * Add class for screen readers to site description.
 * This will keep the site description mark up but will not have any visual presence on the page
 * This runs if their is a header image set in the Customiser.
 *
 * @param string $attributes Add screen reader class if custom logo is set.
 *
 * @author @_neilgee
 */
 function genesischild_add_site_description_class( $attributes ) {
	if ( function_exists( 'has_custom_logo' ) && has_custom_logo() ) {
		$attributes['class'] .= ' screen-reader-text';
		return $attributes;
	}
	else {
		return $attributes;
	}
 }
 add_filter( 'genesis_attr_site-description', 'genesischild_add_site_description_class' );