rtc: Add MAX8998 rtc driver

This adds support for the RTC provided by the Maxim 8998 chip. This
driver was tested on a GONI board by using the rtc-test application from
the Documentation/rtc.txt.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 23 insertions, 1 deletions

diff --git a/drivers/mfd/max8998.c b/drivers/mfd/max8998.c
index 49c140a78ba9..310fd8054f35 100644
--- a/drivers/mfd/max8998.c
+++ b/drivers/mfd/max8998.c
@@ -30,10 +30,14 @@
 #include <linux/mfd/max8998.h>
 #include <linux/mfd/max8998-private.h>
 
+#define RTC_I2C_ADDR            (0x0c >> 1)
+
 static struct mfd_cell max8998_devs[] = {
         {
                 .name = "max8998-pmic",
-        }
+        }, {
+                .name = "max8998-rtc",
+        },
 };
 
 int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
@@ -80,6 +84,21 @@ int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
 }
 EXPORT_SYMBOL(max8998_write_reg);
 
+int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
+{
+        struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
+        int ret;
+
+        mutex_lock(&max8998->iolock);
+        ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
+        mutex_unlock(&max8998->iolock);
+        if (ret < 0)
+                return ret;
+
+        return 0;
+}
+EXPORT_SYMBOL(max8998_bulk_write);
+
 int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
 {
         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
@@ -120,6 +139,9 @@ static int max8998_i2c_probe(struct i2c_client *i2c,
         }
         mutex_init(&max8998->iolock);
 
+        max8998->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
+        i2c_set_clientdata(max8998->rtc, max8998);
+
         max8998_irq_init(max8998);
 
         ret = mfd_add_devices(max8998->dev, -1,