dma: dw: add PCI part of the driver

This is the PCI part of the DesignWare DMAC driver. The controller is usually
used in the Intel hardware such as Intel Medfield.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/drivers/dma/dw/Kconfig b/drivers/dma/dw/Kconfig
index efd9e02..db2b41f 100644
--- a/drivers/dma/dw/Kconfig
+++ b/drivers/dma/dw/Kconfig
@@ -15,6 +15,15 @@
 	  Support the Synopsys DesignWare AHB DMA controller. This
 	  can be integrated in chips such as the Atmel AT32ap7000.
 
+config DW_DMAC_PCI
+	tristate "Synopsys DesignWare AHB DMA PCI driver"
+	depends on PCI
+	select DW_DMAC_CORE
+	help
+	  Support the Synopsys DesignWare AHB DMA controller on the
+	  platfroms that enumerate it as a PCI device. For example,
+	  Intel Medfield has integrated this GPDMA controller.
+
 config DW_DMAC_BIG_ENDIAN_IO
 	bool "Use big endian I/O register access"
 	default y if AVR32