diff -upNr a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
--- a/drivers/rtc/rtc-ds1307.c	2011-06-14 15:56:45.221497487 +1200
+++ b/drivers/rtc/rtc-ds1307.c	2011-06-14 15:57:28.803510835 +1200
@@ -95,15 +95,19 @@ enum ds_type {
 #	define RX8025_BIT_VDET		0x40
 #	define RX8025_BIT_XST		0x20
 
+#define DS1307_MAX_NUM_ADDRS	3
 
 struct ds1307 {
 	u8			offset; /* register's offset */
+	u16			nvram_size;
+	u16			nvram_offset;
+	u8			num_addrs;
 	u8			regs[11];
 	enum ds_type		type;
 	unsigned long		flags;
 #define HAS_NVRAM	0		/* bit 0 == sysfs file active */
 #define HAS_ALARM	1		/* bit 1 == irq claimed */
-	struct i2c_client	*client;
+	struct i2c_client	*client[DS1307_MAX_NUM_ADDRS];
 	struct rtc_device	*rtc;
 	struct work_struct	work;
 	s32 (*read_block_data)(const struct i2c_client *client, u8 command,
@@ -113,23 +117,26 @@ struct ds1307 {
 };
 
 struct chip_desc {
-	unsigned		nvram56:1;
+	unsigned		nvram:1;
 	unsigned		alarm:1;
 };
 
 static const struct chip_desc chips[] = {
 [ds_1307] = {
-	.nvram56	= 1,
+	.nvram		= 1,
 },
 [ds_1337] = {
 	.alarm		= 1,
 },
 [ds_1338] = {
-	.nvram56	= 1,
+	.nvram		= 1,
 },
 [ds_1339] = {
 	.alarm		= 1,
 },
+[ds_1388] = {
+	.nvram		= 1,
+},
 [ds_1340] = {
 },
 [ds_3231] = {
@@ -248,7 +255,7 @@ static void ds1307_work(struct work_stru
 	int			stat, control;
 
 	ds1307 = container_of(work, struct ds1307, work);
-	client = ds1307->client;
+	client = ds1307->client[0];
 	lock = &ds1307->rtc->ops_lock;
 
 	mutex_lock(lock);
@@ -294,7 +301,7 @@ static int ds1307_get_time(struct device
 	int		tmp;
 
 	/* read the RTC date and time registers all at once */
-	tmp = ds1307->read_block_data(ds1307->client,
+	tmp = ds1307->read_block_data(ds1307->client[0],
 		ds1307->offset, 7, ds1307->regs);
 	if (tmp != 7) {
 		dev_err(dev, "%s error %d\n", "read", tmp);
@@ -372,7 +379,7 @@ static int ds1307_set_time(struct device
 		"write", buf[0], buf[1], buf[2], buf[3],
 		buf[4], buf[5], buf[6]);
 
-	result = ds1307->write_block_data(ds1307->client,
+	result = ds1307->write_block_data(ds1307->client[0],
 		ds1307->offset, 7, buf);
 	if (result < 0) {
 		dev_err(dev, "%s error %d\n", "write", result);
@@ -530,8 +537,6 @@ static const struct rtc_class_ops ds13xx
 
 /*----------------------------------------------------------------------*/
 
-#define NVRAM_SIZE	56
-
 static ssize_t
 ds1307_nvram_read(struct file *filp, struct kobject *kobj,
 		struct bin_attribute *attr,
@@ -540,18 +545,39 @@ ds1307_nvram_read(struct file *filp, str
 	struct i2c_client	*client;
 	struct ds1307		*ds1307;
 	int			result;
+	unsigned int		addr = 0;
 
 	client = kobj_to_i2c_client(kobj);
 	ds1307 = i2c_get_clientdata(client);
 
-	if (unlikely(off >= NVRAM_SIZE))
+	if (unlikely(off >= ds1307->nvram_size))
 		return 0;
-	if ((off + count) > NVRAM_SIZE)
-		count = NVRAM_SIZE - off;
+	if ((off + count) > ds1307->nvram_size)
+		count = ds1307->nvram_size - off;
 	if (unlikely(!count))
 		return count;
 
-	result = ds1307->read_block_data(client, 8 + off, count, buf);
+	if (ds1307->nvram_offset < 0xff) {	/* ds1307, ds1338 */
+		result = ds1307->read_block_data(client, ds1307->nvram_offset + off,
count, buf);
+	} else	{	/* ds1388 */
+		if ((off <= 0x00ff) && (off + count > 0x00ff))	{	/* read spans two
blocks */
+			client = ds1307->client[1];		/* first block */
+			addr = (unsigned int)off;
+			result = ds1307->read_block_data(client, addr, (0x100-addr), buf);
+			client = ds1307->client[2];		/* second block */
+			result += ds1307->read_block_data(client, 0x00, (count+addr-0x100),
(buf+0x100-addr));
+
+		} else { 	/* read spans one blocks */
+			if (off <= 0x00ff)	{
+				client = ds1307->client[1];
+				addr = (unsigned int)off;
+			} else if (off <= 0x0200)	{
+				client = ds1307->client[2];
+				addr = (unsigned int)off - 0x100;
+			}
+			result = ds1307->read_block_data(client, addr, count, buf);
+		}
+	}