media: omap3isp: Allow it to build with COMPILE_TEST

There aren't much things required for it to build with COMPILE_TEST.
It just needs to not compile the code that depends on arm-specific
iommu implementation.
Co-developed-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/Kconfig

@@ -63,12 +63,10 @@ config VIDEO_MUX
 config VIDEO_OMAP3
 	tristate "OMAP 3 Camera support"
 	depends on VIDEO_V4L2 && I2C && VIDEO_V4L2_SUBDEV_API
-	depends on ARCH_OMAP3 || COMPILE_TEST
-	depends on ARM
+	depends on (ARCH_OMAP3 && OMAP_IOMMU) || COMPILE_TEST
 	depends on COMMON_CLK
 	depends on HAS_DMA && OF
-	depends on OMAP_IOMMU
-	select ARM_DMA_USE_IOMMU
+	select ARM_DMA_USE_IOMMU if OMAP_IOMMU
 	select VIDEOBUF2_DMA_CONTIG
 	select MFD_SYSCON
 	select V4L2_FWNODE

drivers/media/platform/omap3isp/isp.c

@@ -61,7 +61,9 @@
 #include <linux/sched.h>
 #include <linux/vmalloc.h>
 
+#ifdef CONFIG_ARM_DMA_USE_IOMMU
 #include <asm/dma-iommu.h>
+#endif
 
 #include <media/v4l2-common.h>
 #include <media/v4l2-fwnode.h>
@@ -1938,13 +1940,16 @@ static int isp_initialize_modules(struct isp_device *isp)
 
 static void isp_detach_iommu(struct isp_device *isp)
 {
+#ifdef CONFIG_ARM_DMA_USE_IOMMU
 	arm_iommu_detach_device(isp->dev);
 	arm_iommu_release_mapping(isp->mapping);
 	isp->mapping = NULL;
+#endif
 }
 
 static int isp_attach_iommu(struct isp_device *isp)
 {
+#ifdef CONFIG_ARM_DMA_USE_IOMMU
 	struct dma_iommu_mapping *mapping;
 	int ret;
 
@@ -1973,6 +1978,9 @@ static int isp_attach_iommu(struct isp_device *isp)
 	arm_iommu_release_mapping(isp->mapping);
 	isp->mapping = NULL;
 	return ret;
+#else
+	return -ENODEV;
+#endif
 }
 
 /*