diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
index 7106eb238d8c..26cb05992e9f 100644
--- a/drivers/tty/serial/samsung_tty.c
+++ b/drivers/tty/serial/samsung_tty.c
@@ -1573,26 +1573,11 @@ static const char *s3c24xx_serial_type(struct uart_port *port)
 	}
 }
 
-#define MAP_SIZE (0x100)
-
-static void s3c24xx_serial_release_port(struct uart_port *port)
-{
-	release_mem_region(port->mapbase, MAP_SIZE);
-}
-
-static int s3c24xx_serial_request_port(struct uart_port *port)
-{
-	const char *name = s3c24xx_serial_portname(port);
-
-	return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY;
-}
-
 static void s3c24xx_serial_config_port(struct uart_port *port, int flags)
 {
 	struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
 
-	if (flags & UART_CONFIG_TYPE &&
-	    s3c24xx_serial_request_port(port) == 0)
+	if (flags & UART_CONFIG_TYPE)
 		port->type = info->port_type;
 }
 
@@ -1645,8 +1630,6 @@ static const struct uart_ops s3c24xx_serial_ops = {
 	.shutdown	= s3c24xx_serial_shutdown,
 	.set_termios	= s3c24xx_serial_set_termios,
 	.type		= s3c24xx_serial_type,
-	.release_port	= s3c24xx_serial_release_port,
-	.request_port	= s3c24xx_serial_request_port,
 	.config_port	= s3c24xx_serial_config_port,
 	.verify_port	= s3c24xx_serial_verify_port,
 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
@@ -1668,8 +1651,6 @@ static const struct uart_ops s3c64xx_serial_ops = {
 	.shutdown	= s3c64xx_serial_shutdown,
 	.set_termios	= s3c24xx_serial_set_termios,
 	.type		= s3c24xx_serial_type,
-	.release_port	= s3c24xx_serial_release_port,
-	.request_port	= s3c24xx_serial_request_port,
 	.config_port	= s3c24xx_serial_config_port,
 	.verify_port	= s3c24xx_serial_verify_port,
 #if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
@@ -1927,8 +1908,8 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
 
 	dev_dbg(port->dev, "resource %pR)\n", res);
 
-	port->membase = devm_ioremap(port->dev, res->start, resource_size(res));
-	if (!port->membase) {
+	port->membase = devm_ioremap_resource(port->dev, res);
+	if (IS_ERR(port->membase)) {
 		dev_err(port->dev, "failed to remap controller address\n");
 		return -EBUSY;
 	}