diff --git a/Documentation/devicetree/bindings/ipmi/npcm7xx-kcs-bmc.txt b/Documentation/devicetree/bindings/ipmi/npcm7xx-kcs-bmc.txt
index 352f5e9c759b..4fda76e63396 100644
--- a/Documentation/devicetree/bindings/ipmi/npcm7xx-kcs-bmc.txt
+++ b/Documentation/devicetree/bindings/ipmi/npcm7xx-kcs-bmc.txt
@@ -1,12 +1,13 @@
-* Nuvoton NPCM7xx KCS (Keyboard Controller Style) IPMI interface
+* Nuvoton NPCM KCS (Keyboard Controller Style) IPMI interface
 
-The Nuvoton SOCs (NPCM7xx) are commonly used as BMCs
+The Nuvoton SOCs (NPCM) are commonly used as BMCs
 (Baseboard Management Controllers) and the KCS interface can be
 used to perform in-band IPMI communication with their host.
 
 Required properties:
 - compatible : should be one of
     "nuvoton,npcm750-kcs-bmc"
+    "nuvoton,npcm845-kcs-bmc", "nuvoton,npcm750-kcs-bmc"
 - interrupts : interrupt generated by the controller
 - kcs_chan : The KCS channel number in the controller
 
diff --git a/drivers/char/ipmi/Kconfig b/drivers/char/ipmi/Kconfig
index b061e6b513ed..39565cf74b2c 100644
--- a/drivers/char/ipmi/Kconfig
+++ b/drivers/char/ipmi/Kconfig
@@ -119,13 +119,13 @@ config ASPEED_KCS_IPMI_BMC
 	  provides the access of KCS IO space for BMC side.
 
 config NPCM7XX_KCS_IPMI_BMC
-	depends on ARCH_NPCM7XX || COMPILE_TEST
+	depends on ARCH_NPCM || COMPILE_TEST
 	select IPMI_KCS_BMC
 	select REGMAP_MMIO
-	tristate "NPCM7xx KCS IPMI BMC driver"
+	tristate "NPCM KCS IPMI BMC driver"
 	help
 	  Provides a driver for the KCS (Keyboard Controller Style) IPMI
-	  interface found on Nuvoton NPCM7xx SOCs.
+	  interface found on Nuvoton NPCM SOCs.
 
 	  The driver implements the BMC side of the KCS contorller, it
 	  provides the access of KCS IO space for BMC side.
diff --git a/drivers/char/ipmi/ipmi_ipmb.c b/drivers/char/ipmi/ipmi_ipmb.c
index 25c010c9ec25..7c1aee5e11b7 100644
--- a/drivers/char/ipmi/ipmi_ipmb.c
+++ b/drivers/char/ipmi/ipmi_ipmb.c
@@ -218,8 +218,8 @@ static void ipmi_ipmb_send_response(struct ipmi_ipmb_dev *iidev,
 {
 	if ((msg->data[0] >> 2) & 1) {
 		/*
-		 * It's a response being sent, we needto return a
-		 * response response.  Fake a send msg command
+		 * It's a response being sent, we need to return a
+		 * response to the response.  Fake a send msg command
 		 * response with channel 0.  This will always be ipmb
 		 * direct.
 		 */
@@ -424,10 +424,8 @@ static void ipmi_ipmb_request_events(void *send_info)
 	/* We don't fetch events here. */
 }
 
-static void ipmi_ipmb_remove(struct i2c_client *client)
+static void ipmi_ipmb_cleanup(struct ipmi_ipmb_dev *iidev)
 {
-	struct ipmi_ipmb_dev *iidev = i2c_get_clientdata(client);
-
 	if (iidev->slave) {
 		i2c_slave_unregister(iidev->slave);
 		if (iidev->slave != iidev->client)
@@ -436,7 +434,13 @@ static void ipmi_ipmb_remove(struct i2c_client *client)
 	iidev->slave = NULL;
 	iidev->client = NULL;
 	ipmi_ipmb_stop_thread(iidev);
+}
 
+static void ipmi_ipmb_remove(struct i2c_client *client)
+{
+	struct ipmi_ipmb_dev *iidev = i2c_get_clientdata(client);
+
+	ipmi_ipmb_cleanup(iidev);
 	ipmi_unregister_smi(iidev->intf);
 }
 
@@ -542,7 +546,7 @@ static int ipmi_ipmb_probe(struct i2c_client *client)
 out_err:
 	if (slave && slave != client)
 		i2c_unregister_device(slave);
-	ipmi_ipmb_remove(client);
+	ipmi_ipmb_cleanup(iidev);
 	return rv;
 }
 
diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index 703433493c85..49a1707693c9 100644
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -736,12 +736,6 @@ static void intf_free(struct kref *ref)
 	kfree(intf);
 }
 
-struct watcher_entry {
-	int              intf_num;
-	struct ipmi_smi  *intf;
-	struct list_head link;
-};
-
 int ipmi_smi_watcher_register(struct ipmi_smi_watcher *watcher)
 {
 	struct ipmi_smi *intf;
@@ -4357,7 +4351,7 @@ static int handle_oem_get_msg_cmd(struct ipmi_smi *intf,
 
 			/*
 			 * The message starts at byte 4 which follows the
-			 * the Channel Byte in the "GET MESSAGE" command
+			 * Channel Byte in the "GET MESSAGE" command
 			 */
 			recv_msg->msg.data_len = msg->rsp_size - 4;
 			memcpy(recv_msg->msg_data, &msg->rsp[4],
diff --git a/drivers/char/ipmi/ipmi_ssif.c b/drivers/char/ipmi/ipmi_ssif.c
index 13da021e7c6b..e1072809fe31 100644
--- a/drivers/char/ipmi/ipmi_ssif.c
+++ b/drivers/char/ipmi/ipmi_ssif.c
@@ -2098,7 +2098,7 @@ static struct platform_driver ipmi_driver = {
 	.id_table       = ssif_plat_ids
 };
 
-static int init_ipmi_ssif(void)
+static int __init init_ipmi_ssif(void)
 {
 	int i;
 	int rv;
@@ -2140,7 +2140,7 @@ static int init_ipmi_ssif(void)
 }
 module_init(init_ipmi_ssif);
 
-static void cleanup_ipmi_ssif(void)
+static void __exit cleanup_ipmi_ssif(void)
 {
 	if (!initialized)
 		return;
diff --git a/drivers/char/ipmi/kcs_bmc_aspeed.c b/drivers/char/ipmi/kcs_bmc_aspeed.c
index cdc88cde1e9a..19c32bf50e0e 100644
--- a/drivers/char/ipmi/kcs_bmc_aspeed.c
+++ b/drivers/char/ipmi/kcs_bmc_aspeed.c
@@ -207,17 +207,24 @@ static void aspeed_kcs_updateb(struct kcs_bmc_device *kcs_bmc, u32 reg, u8 mask,
 }
 
 /*
- * AST_usrGuide_KCS.pdf
- * 2. Background:
- *   we note D for Data, and C for Cmd/Status, default rules are
- *     A. KCS1 / KCS2 ( D / C:X / X+4 )
- *        D / C : CA0h / CA4h
- *        D / C : CA8h / CACh
- *     B. KCS3 ( D / C:XX2h / XX3h )
- *        D / C : CA2h / CA3h
- *        D / C : CB2h / CB3h
- *     C. KCS4
- *        D / C : CA4h / CA5h
+ * We note D for Data, and C for Cmd/Status, default rules are
+ *
+ * 1. Only the D address is given:
+ *   A. KCS1/KCS2 (D/C: X/X+4)
+ *      D/C: CA0h/CA4h
+ *      D/C: CA8h/CACh
+ *   B. KCS3 (D/C: XX2/XX3h)
+ *      D/C: CA2h/CA3h
+ *   C. KCS4 (D/C: X/X+1)
+ *      D/C: CA4h/CA5h
+ *
+ * 2. Both the D/C addresses are given:
+ *   A. KCS1/KCS2/KCS4 (D/C: X/Y)
+ *      D/C: CA0h/CA1h
+ *      D/C: CA8h/CA9h
+ *      D/C: CA4h/CA5h
+ *   B. KCS3 (D/C: XX2/XX3h)
+ *      D/C: CA2h/CA3h
  */
 static int aspeed_kcs_set_address(struct kcs_bmc_device *kcs_bmc, u32 addrs[2], int nr_addrs)
 {
diff --git a/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c b/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c
index 486834a962c3..cf670e891966 100644
--- a/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c
+++ b/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c
@@ -548,7 +548,7 @@ static struct kcs_bmc_driver kcs_bmc_ipmi_driver = {
 	.ops = &kcs_bmc_ipmi_driver_ops,
 };
 
-static int kcs_bmc_ipmi_init(void)
+static int __init kcs_bmc_ipmi_init(void)
 {
 	kcs_bmc_register_driver(&kcs_bmc_ipmi_driver);
 
@@ -556,7 +556,7 @@ static int kcs_bmc_ipmi_init(void)
 }
 module_init(kcs_bmc_ipmi_init);
 
-static void kcs_bmc_ipmi_exit(void)
+static void __exit kcs_bmc_ipmi_exit(void)
 {
 	kcs_bmc_unregister_driver(&kcs_bmc_ipmi_driver);
 }
diff --git a/drivers/char/ipmi/kcs_bmc_serio.c b/drivers/char/ipmi/kcs_bmc_serio.c
index 7e2067628a6c..1793358be782 100644
--- a/drivers/char/ipmi/kcs_bmc_serio.c
+++ b/drivers/char/ipmi/kcs_bmc_serio.c
@@ -140,7 +140,7 @@ static struct kcs_bmc_driver kcs_bmc_serio_driver = {
 	.ops = &kcs_bmc_serio_driver_ops,
 };
 
-static int kcs_bmc_serio_init(void)
+static int __init kcs_bmc_serio_init(void)
 {
 	kcs_bmc_register_driver(&kcs_bmc_serio_driver);
 
@@ -148,7 +148,7 @@ static int kcs_bmc_serio_init(void)
 }
 module_init(kcs_bmc_serio_init);
 
-static void kcs_bmc_serio_exit(void)
+static void __exit kcs_bmc_serio_exit(void)
 {
 	kcs_bmc_unregister_driver(&kcs_bmc_serio_driver);
 }