From 300a7735becf55f7fd18f8cd3dc3b945a0cab712 Mon Sep 17 00:00:00 2001
From: Sean Nyekjaer <sean.nyekjaer@prevas.dk>
Date: Thu, 8 Jun 2017 12:36:54 +0200
Subject: rtc: ds1307: add ds1308 variant

The ds1308 variant is very similar to the already supported ds1338
variant, it have more debug registers and a square wave clock output.

Signed-off-by: Sean Nyekjaer <sean.nyekjaer@prevas.dk>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 drivers/rtc/rtc-ds1307.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -31,6 +31,7 @@
  */
 enum ds_type {
 	ds_1307,
+	ds_1308,
 	ds_1337,
 	ds_1338,
 	ds_1339,
@@ -144,6 +145,10 @@ static struct chip_desc chips[last_ds_ty
 		.nvram_offset	= 8,
 		.nvram_size	= 56,
 	},
+	[ds_1308] = {
+		.nvram_offset	= 8,
+		.nvram_size	= 56,
+	},
 	[ds_1337] = {
 		.alarm		= 1,
 	},
@@ -175,6 +180,7 @@ static struct chip_desc chips[last_ds_ty
 
 static const struct i2c_device_id ds1307_id[] = {
 	{ "ds1307", ds_1307 },
+	{ "ds1308", ds_1308 },
 	{ "ds1337", ds_1337 },
 	{ "ds1338", ds_1338 },
 	{ "ds1339", ds_1339 },
@@ -1488,6 +1494,7 @@ read_rtc:
 			goto read_rtc;
 		}
 		break;
+	case ds_1308:
 	case ds_1338:
 		/* clock halted?  turn it on, so clock can tick. */
 		if (tmp & DS1307_BIT_CH)
