Adding 6686d

As done here: https://lore.kernel.org/all/20210303065853.1894677-1-lijq9@lenovo.com/

nct6687.c

@@ -15,6 +15,7 @@
  *
  * Chip       #voltage   #fan    #pwm    #temp  chip ID
  * nct6683    14(1)      8       8       7      0xc732  (partial support)
+ * nct6686d   21(1)      16      8       32(1)  0xd440
  * nct6687    14(1)      8       8       7      0xd592
  *
  * Notes:
@@ -42,6 +43,7 @@
 enum kinds
 {
 	nct6683,
+	nct6686,
 	nct6687
 };
 
@@ -56,11 +58,13 @@ MODULE_PARM_DESC(manual, "Set voltage input and voltage label configured with ex
 
 static const char *const nct6687_device_names[] = {
 	"nct6683",
+	"nct6686",
 	"nct6687",
 };
 
 static const char *const nct6687_chip_names[] = {
 	"NCT6683D",
+	"NCT6686D",
 	"NCT6687D",
 };
 
@@ -81,6 +85,7 @@ static const char *const nct6687_chip_names[] = {
 #define SIO_REG_ADDR 0x60		 /* Logical device address (2 bytes) */
 
 #define SIO_NCT6683D_ID 0xc732
+#define SIO_NCT6686_ID 0xd440
 #define SIO_NCT6687_ID 0xd451 // 0xd592
 #define SIO_NCT6687D_ID 0xd592
 
@@ -1096,6 +1101,8 @@ static int __init nct6687_find(int sioaddr, struct nct6687_sio_data *sio_data)
 
 	if (val == SIO_NCT6683D_ID) {
 		sio_data->kind = nct6683;
+	} else if (val == SIO_NCT6686_ID) {
+		sio_data->kind = nct6686;
 	} else if (val == SIO_NCT6687_ID || val == SIO_NCT6687D_ID || force)
 	{
 		sio_data->kind = nct6687;