i2c-designware: move i2c functionality bit field to be adapter specific

The functionality of the adapter depends on the configuration of the
IP block at silicon compile time and is adapter specific.
Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

drivers/i2c/busses/i2c-designware-core.c

@@ -457,12 +457,8 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
 
 u32 i2c_dw_func(struct i2c_adapter *adap)
 {
-	return	I2C_FUNC_I2C |
-		I2C_FUNC_10BIT_ADDR |
-		I2C_FUNC_SMBUS_BYTE |
-		I2C_FUNC_SMBUS_BYTE_DATA |
-		I2C_FUNC_SMBUS_WORD_DATA |
-		I2C_FUNC_SMBUS_I2C_BLOCK;
+	struct dw_i2c_dev *dev = i2c_get_adapdata(adap);
+	return dev->functionality;
 }
 
 static u32 i2c_dw_read_clear_intrbits(struct dw_i2c_dev *dev)

drivers/i2c/busses/i2c-designware-core.h

@@ -182,6 +182,7 @@ struct dw_i2c_dev {
 	int			irq;
 	int			swab;
 	struct i2c_adapter	adapter;
+	u32			functionality;
 	unsigned int		tx_fifo_depth;
 	unsigned int		rx_fifo_depth;
 };

drivers/i2c/busses/i2c-designware-platdrv.c

@@ -96,6 +96,14 @@ static int __devinit dw_i2c_probe(struct platform_device *pdev)
 	}
 	clk_enable(dev->clk);
 
+	dev->functionality =
+		I2C_FUNC_I2C |
+		I2C_FUNC_10BIT_ADDR |
+		I2C_FUNC_SMBUS_BYTE |
+		I2C_FUNC_SMBUS_BYTE_DATA |
+		I2C_FUNC_SMBUS_WORD_DATA |
+		I2C_FUNC_SMBUS_I2C_BLOCK;
+
 	dev->base = ioremap(mem->start, resource_size(mem));
 	if (dev->base == NULL) {
 		dev_err(&pdev->dev, "failure mapping io resources\n");