mfd: da9063: Occupy second I2C address

The second address can be used as a shortcut to access register pages
2+3. The driver does not use this feature yet. The second address should
still be marked as used, otherwise userspace could interfere with the
driver.

Signed-off-by: Wolfram Sang <[e-mail]>
Reviewed-by: Peter Rosin <[e-mail]>
Reviewed-by: Bartosz Golaszewski <[e-mail]>
Reviewed-by: Kieran Bingham <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/da9063-i2c.c

···
 		}
 	}
 
+	/* Reserve our unused second address so userspace won't interfere */
+	devm_i2c_new_dummy_device(&i2c->dev, i2c->adapter, i2c->addr + 1);
+
 	return da9063_device_init(da9063, i2c->irq);
 }