Hi Arnd,

Thanks for pointing this - dma-ranges seem to work properly. This makes 
the patch much simpler. To be included to the next iteration.

I also removed DMA_OF from Kconfig and CONFIG_DMA_OF from my defconfig and 
it was automatically added during preparation of .cofing for build.

On Tue, 30 Jun 2015, Arnd Bergmann wrote:

On Tuesday 30 June 2015 14:27:28 Paul Osmialowski wrote:

quoted

Note that <mach/memory.h> is needed (which is denoted by
CONFIG_NEED_MACH_MEMORY_H) as it provides macros required for proper
operation of DMA allocation functions.

You can't do this, it breaks compilation when multiple platforms
are enabled.

quoted

Signed-off-by: Paul Osmialowski <redacted>
---
 arch/arm/Kconfig                            |  4 ++
 arch/arm/boot/dts/kinetis.dtsi              | 34 ++++++++++++++++
 arch/arm/mach-kinetis/include/mach/memory.h | 61 +++++++++++++++++++++++++++++
 3 files changed, 99 insertions(+)
 create mode 100644 arch/arm/mach-kinetis/include/mach/memory.h

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index b21592b..8ccffee 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig

@@ -971,6 +971,10 @@ config ARCH_KINETIS
 	select CLKSRC_KINETIS
 	select PINCTRL
 	select PINCTRL_KINETIS
+	select DMADEVICES
+	select FSL_EDMA
+	select DMA_OF
+	select NEED_MACH_MEMORY_H

I think DMA_OF is implied by dmaengine support in combination with CONFIG_OF

quoted

+
+#ifndef _MACH_KINETIS_MEMORY_H
+#define _MACH_KINETIS_MEMORY_H
+
+#ifndef __ASSEMBLY__
+
+/*
+ * On Kinetis K70, consistent DMA memory resides in a special
+ * DDRAM alias region (non-cacheable DDRAM at 0x80000000).
+ *
+ */
+#define KINETIS_PHYS_DMA_OFFSET UL(0x80000000)
+
+/*
+ * Mask of the field used to distinguish DDRAM aliases
+ */
+#define KINETIS_DRAM_ALIAS_MASK UL(0xf8000000)

This should be expressed using the 'dma-ranges' properties in the
bus nodes above any DMA master, the normal DMA mapping code will
then do the right thing.

	Arnd

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