dma: sh: add Kconfig

This patch adds Kconfig in the drivers/dma/sh. This patch also adds
a new config "SH_DMAE_BASE" and the "config SH_DMAE" depends on it.
Since some drivers (e.g. sh_mmcif.c) depends on shdma-base.c if
CONFIG_DMA_ENGINE=y, the "config SH_DMAE_BASE" is set as "bool".

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

drivers/dma/sh/Kconfig

@@ -0,0 +1,18 @@
+#
+# DMA engine configuration for sh
+#
+
+config SH_DMAE_BASE
+	bool "Renesas SuperH DMA Engine support"
+	depends on (SUPERH && SH_DMA) || (ARM && ARCH_SHMOBILE)
+	depends on !SH_DMA_API
+	default y
+	select DMA_ENGINE
+	help
+	  Enable support for the Renesas SuperH DMA controllers.
+
+config SH_DMAE
+	tristate "Renesas SuperH DMAC support"
+	depends on SH_DMAE_BASE
+	help
+	  Enable support for the Renesas SuperH DMA controllers.

drivers/dma/sh/Makefile

@@ -1,2 +1,2 @@
-obj-$(CONFIG_SH_DMAE) += shdma-base.o
+obj-$(CONFIG_SH_DMAE_BASE) += shdma-base.o
 obj-$(CONFIG_SH_DMAE) += shdma.o