diff --git a/drivers/tty/serial/men_z135_uart.c b/drivers/tty/serial/men_z135_uart.c
index b90e7b30468b..3141aa20843d 100644
--- a/drivers/tty/serial/men_z135_uart.c
+++ b/drivers/tty/serial/men_z135_uart.c
@@ -35,8 +35,6 @@
 #define MEN_Z135_BAUD_REG		0x810
 #define MEN_Z135_TIMEOUT		0x814
 
-#define MEN_Z135_MEM_SIZE		0x818
-
 #define IRQ_ID(x) ((x) & 0x1f)
 
 #define MEN_Z135_IER_RXCIEN BIT(0)		/* RX Space IRQ */
@@ -124,6 +122,7 @@ MODULE_PARM_DESC(rx_timeout, "RX timeout. "
 struct men_z135_port {
 	struct uart_port port;
 	struct mcb_device *mdev;
+	struct resource *mem;
 	unsigned char *rxbuf;
 	u32 stat_reg;
 	spinlock_t lock;
@@ -734,22 +733,30 @@ static const char *men_z135_type(struct uart_port *port)
 
 static void men_z135_release_port(struct uart_port *port)
 {
+	struct men_z135_port *uart = to_men_z135(port);
+
 	iounmap(port->membase);
 	port->membase = NULL;
 
-	release_mem_region(port->mapbase, MEN_Z135_MEM_SIZE);
+	mcb_release_mem(uart->mem);
 }
 
 static int men_z135_request_port(struct uart_port *port)
 {
-	int size = MEN_Z135_MEM_SIZE;
+	struct men_z135_port *uart = to_men_z135(port);
+	struct mcb_device *mdev = uart->mdev;
+	struct resource *mem;
 
-	if (!request_mem_region(port->mapbase, size, "men_z135_port"))
-		return -EBUSY;
+	mem = mcb_request_mem(uart->mdev, dev_name(&mdev->dev));
+	if (IS_ERR(mem))
+		return PTR_ERR(mem);
 
-	port->membase = ioremap(port->mapbase, MEN_Z135_MEM_SIZE);
+	port->mapbase = mem->start;
+	uart->mem = mem;
+
+	port->membase = ioremap(mem->start, resource_size(mem));
 	if (port->membase == NULL) {
-		release_mem_region(port->mapbase, MEN_Z135_MEM_SIZE);
+		mcb_release_mem(mem);
 		return -ENOMEM;
 	}