On Thursday 03 March 2016 21:40:23 Krzysztof Kozlowski wrote:

quoted

quoted

        select MFD_SYSCON

diff --git a/drivers/media/platform/exynos4-is/Kconfig b/drivers/media/platform/exynos4-is/Kconfig
index 57d42c6172c5..c4317b99d257 100644
--- a/drivers/media/platform/exynos4-is/Kconfig
+++ b/drivers/media/platform/exynos4-is/Kconfig

@@ -17,6 +17,7 @@ config VIDEO_S5P_FIMC
        tristate "S5P/EXYNOS4 FIMC/CAMIF camera interface driver"
        depends on I2C
        depends on HAS_DMA
+       depends on HAS_IOMEM    # For MFD_SYSCON
        select VIDEOBUF2_DMA_CONTIG
        select V4L2_MEM2MEM_DEV

This  is guarded by HAS_DMA, which implies HAS_IOMEM afaik.

Looking at Kconfigs - no, it is not implied (or am I missing
something)... and sometimes dependency on HAS_IOMEM is next to
HAS_DMA.

Ah, you are right: UML has no DMA and no IOMEM, but s390 can
have IOMEM (if PCI is enabled) and always sets HAS_DMA.

In practice, I think the HAS_DMA symbol is not as well-defined
as it should be, it basically refers to the presence of the dma-mapping.h
API, and that only really makes sense when you also have IOMEM,
so there might be an implied dependency between the two, but it's
not enforced or actually true.

	Arnd