From: Enrico Scholz <enrico.sch...@sigma-chemnitz.de>

Used to set or clear bits of a register.

The calculation of 'client' might look odd and unnecessary complicated.
But style prepares access to other register banks which is added in
following patches.

Signed-off-by: Enrico Scholz <enrico.sch...@sigma-chemnitz.de>
Tested-by: Stefan Christ <s.chr...@phytec.de>
Signed-off-by: Christian Hemp <c.h...@phytec.de>
---
 drivers/mfd/da9063.c | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/drivers/mfd/da9063.c b/drivers/mfd/da9063.c
index 74ad5bfdab..68b0723b61 100644
--- a/drivers/mfd/da9063.c
+++ b/drivers/mfd/da9063.c
@@ -52,6 +52,43 @@ struct da9063 {
 #define DA9063_WATCHDOG                0x01
 #define DA9063_SHUTDOWN                0x02
 
+static int da906x_reg_update(struct da9063 *priv, unsigned int reg,
+                            uint8_t mask, uint8_t val)
+{
+       struct i2c_client *client;
+       uint8_t tmp;
+       int ret;
+
+       if (reg < 0x100)
+               client = priv->client;
+       else
+               /* this should/can not happen because function is usually
+                * called with a static register number; warn about it
+                * below */
+               client = NULL;
+
+       if (WARN_ON(!client))
+               return -EINVAL;
+
+       ret = i2c_read_reg(client, reg & 0xffu, &tmp, 1);
+       if (ret < 0) {
+               dev_warn(priv->dev, "failed to read reg %02x\n", reg);
+               return ret;
+       }
+
+       tmp &= ~mask;
+       tmp |= val;
+
+       ret = i2c_write_reg(client, reg & 0xffu, &tmp, 1);
+       if (ret < 0) {
+               dev_warn(priv->dev, "failed to write %02x into reg %02x\n",
+                        tmp, reg);
+               return ret;
+       }
+
+       return 0;
+}
+
 static int da9063_watchdog_ping(struct da9063 *priv)
 {
        int ret;
-- 
2.16.1


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