diff --git a/drivers/sh/pfc.c b/drivers/sh/pfc.c
index cf0303acab8e..dee581f6382c 100644
--- a/drivers/sh/pfc.c
+++ b/drivers/sh/pfc.c
@@ -7,6 +7,8 @@
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/errno.h>
 #include <linux/kernel.h>
 #include <linux/list.h>
@@ -581,7 +583,7 @@ int register_pinmux(struct pinmux_info *pip)
 {
 	struct gpio_chip *chip = &pip->chip;
 
-	pr_info("sh pinmux: %s handling gpio %d -> %d\n",
+	pr_info("%s handling gpio %d -> %d\n",
 		pip->name, pip->first_gpio, pip->last_gpio);
 
 	setup_data_regs(pip);
@@ -602,3 +604,10 @@ int register_pinmux(struct pinmux_info *pip)
 
 	return gpiochip_add(chip);
 }
+
+int unregister_pinmux(struct pinmux_info *pip)
+{
+	pr_info("%s deregistering\n", pip->name);
+
+	return gpiochip_remove(&pip->chip);
+}
diff --git a/include/linux/sh_pfc.h b/include/linux/sh_pfc.h
index 07c08af9f8f6..30cae70874f4 100644
--- a/include/linux/sh_pfc.h
+++ b/include/linux/sh_pfc.h
@@ -92,5 +92,6 @@ struct pinmux_info {
 };
 
 int register_pinmux(struct pinmux_info *pip);
+int unregister_pinmux(struct pinmux_info *pip);
 
 #endif /* __SH_PFC_H */