genesis-logo.php

<?php

// ADD THIS TO YOUR CHILD THEMES FUNCTIONS.PHP
remove_action( 'genesis_site_title', 'genesis_remove_site_title' );
add_action( 'genesis_site_title', 'child_genesis_add_site_title' );

function child_genesis_add_site_title() { 
?>
<?php if ( get_theme_mod( 'child_genesis_logo' ) ) : ?>
        <h1 itemprop="headline" class='site-title'><a href='<?php echo esc_url( home_url( '/' ) ); ?>' title='<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>' rel='home'><img src='<?php echo esc_url( get_theme_mod( 'child_genesis_logo' ) ); ?>' alt='<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>'></a></h1>
<?php else : ?>
        <h1 itemprop="headline" class='site-title'><a href='<?php echo esc_url( home_url( '/' ) ); ?>' title='<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>' rel='home'><?php bloginfo( 'name' ); ?></a></h1>
<?php endif; ?>
<?php
}

function child_genesis_theme_customizer_add_logo_uploader( $wp_customize ) {
$wp_customize->add_setting( 'child_genesis_logo' );
$wp_customize->add_control( new WP_Customize_Image_Control( $wp_customize, 'child_genesis_logo', array(
    'label'    => 'Logo Image',
    'section'  => 'child_genesis_logo_section',
    'settings' => 'child_genesis_logo',
) ) );
}
add_action('customize_register', 'child_genesis_theme_customizer_add_logo_uploader');