diff options
| author | Honghui Zhang <honghui.zhang@mediatek.com> | 2016-06-08 17:50:57 +0800 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2016-06-21 11:36:19 +0200 |
| commit | 7e42626ad3f4540143e68ba41e5e553f2715b451 (patch) | |
| tree | 1e88a18fcbba8176ddfe964d688d6b2dceda0f64 /Documentation/devicetree/bindings/iommu | |
| parent | 9fec79df898602f5a20c0ab489bf9780aa98185d (diff) | |
dt-bindings: mediatek: add descriptions for mediatek mt2701 iommu and smi
This patch defines the local arbitor port IDs for mediatek SoC MT2701 and
add descriptions of binding for mediatek generation one iommu and smi.
Signed-off-by: Honghui Zhang <honghui.zhang@mediatek.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'Documentation/devicetree/bindings/iommu')
| -rw-r--r-- | Documentation/devicetree/bindings/iommu/mediatek,iommu.txt | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/Documentation/devicetree/bindings/iommu/mediatek,iommu.txt b/Documentation/devicetree/bindings/iommu/mediatek,iommu.txt index cd1b1cd7b5c4..53c20cae309f 100644 --- a/Documentation/devicetree/bindings/iommu/mediatek,iommu.txt +++ b/Documentation/devicetree/bindings/iommu/mediatek,iommu.txt @@ -1,7 +1,9 @@ * Mediatek IOMMU Architecture Implementation - Some Mediatek SOCs contain a Multimedia Memory Management Unit (M4U) which -uses the ARM Short-Descriptor translation table format for address translation. + Some Mediatek SOCs contain a Multimedia Memory Management Unit (M4U), and +this M4U have two generations of HW architecture. Generation one uses flat +pagetable, and only supports 4K size page mapping. Generation two uses the +ARM Short-Descriptor translation table format for address translation. About the M4U Hardware Block Diagram, please check below: @@ -36,7 +38,9 @@ in each larb. Take a example, There are many ports like MC, PP, VLD in the video decode local arbiter, all these ports are according to the video HW. Required properties: -- compatible : must be "mediatek,mt8173-m4u". +- compatible : must be one of the following string: + "mediatek,mt2701-m4u" for mt2701 which uses generation one m4u HW. + "mediatek,mt8173-m4u" for mt8173 which uses generation two m4u HW. - reg : m4u register base and size. - interrupts : the interrupt of m4u. - clocks : must contain one entry for each clock-names. @@ -46,7 +50,8 @@ Required properties: according to the local arbiter index, like larb0, larb1, larb2... - iommu-cells : must be 1. This is the mtk_m4u_id according to the HW. Specifies the mtk_m4u_id as defined in - dt-binding/memory/mt8173-larb-port.h. + dt-binding/memory/mt2701-larb-port.h for mt2701 and + dt-binding/memory/mt8173-larb-port.h for mt8173 Example: iommu: iommu@10205000 { |