diff --git a/drivers/tty/serial/cpm_uart/cpm_uart.h b/drivers/tty/serial/cpm_uart/cpm_uart.h
index 81c1c5f97d19..1b5523474ab4 100644
--- a/drivers/tty/serial/cpm_uart/cpm_uart.h
+++ b/drivers/tty/serial/cpm_uart/cpm_uart.h
@@ -76,7 +76,6 @@ struct uart_cpm_port {
 };
 
 /* these are located in their respective files */
-void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd);
 void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
 				struct device_node *np);
 void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram);
diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_core.c b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
index 743892c0e143..e6f3e4da3144 100644
--- a/drivers/tty/serial/cpm_uart/cpm_uart_core.c
+++ b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
@@ -54,6 +54,11 @@ static void cpm_uart_initbd(struct uart_cpm_port *pinfo);
 
 #define HW_BUF_SPD_THRESHOLD    2400
 
+static void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
+{
+	cpm_command(port->command, cmd);
+}
+
 /*
  * Check, if transmit buffers are processed
 */
diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_cpm1.c b/drivers/tty/serial/cpm_uart/cpm_uart_cpm1.c
index 56fc527015cb..b5680376ff3c 100644
--- a/drivers/tty/serial/cpm_uart/cpm_uart_cpm1.c
+++ b/drivers/tty/serial/cpm_uart/cpm_uart_cpm1.c
@@ -36,11 +36,6 @@
 
 /**************************************************************/
 
-void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
-{
-	cpm_command(port->command, cmd);
-}
-
 void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
 				struct device_node *np)
 {
diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_cpm2.c b/drivers/tty/serial/cpm_uart/cpm_uart_cpm2.c
index 108af254e8f3..35f539fcfde8 100644
--- a/drivers/tty/serial/cpm_uart/cpm_uart_cpm2.c
+++ b/drivers/tty/serial/cpm_uart/cpm_uart_cpm2.c
@@ -33,11 +33,6 @@
 
 /**************************************************************/
 
-void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
-{
-	cpm_command(port->command, cmd);
-}
-
 void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
 				struct device_node *np)
 {