i2c-designware: Add support for Designware core behind PCI devices.

Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h
index dc016e2..601dd67 100644
--- a/drivers/i2c/busses/i2c-designware-core.h
+++ b/drivers/i2c/busses/i2c-designware-core.h
@@ -68,6 +68,7 @@
 	struct mutex		lock;
 	struct clk		*clk;
 	u32			(*get_clk_rate_khz) (struct dw_i2c_dev *dev);
+	struct dw_pci_controller *controller;
 	int			cmd_err;
 	struct i2c_msg		*msgs;
 	int			msgs_num;