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| author | Yong Wu <yong.wu@mediatek.com> | 2021-09-14 14:36:52 +0300 |
|---|---|---|
| committer | Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> | 2021-09-22 09:40:10 +0300 |
| commit | 599e681a31a2dfa7359b8e420a1157ed015f840b (patch) | |
| tree | 32c35f596ce8778a1c5e685585e0c44315985821 /Documentation/devicetree/bindings/memory-controllers | |
| parent | b01065eee432b3ae91a2c0aaab66c2cae2e9812d (diff) | |
| download | linux-599e681a31a2dfa7359b8e420a1157ed015f840b.tar.xz | |
dt-bindings: memory: mediatek: Add mt8195 smi sub common
Add the binding for smi-sub-common. The SMI block diagram like this:
IOMMU
| |
smi-common
------------------
| .... |
larb0 larb7 <-max is 8
The smi-common connects with smi-larb and IOMMU. The maximum larbs number
that connects with a smi-common is 8. If the engines number is over 8,
sometimes we use a smi-sub-common which is nearly same with smi-common.
It supports up to 8 input and 1 output(smi-common has 2 output)
Something like:
IOMMU
| |
smi-common
---------------------
| | ...
larb0 sub-common ... <-max is 8
-----------
| | ... <-max is 8 too.
larb2 larb5
We don't need extra SW setting for smi-sub-common, only the sub-common has
special clocks need to enable when the engines access dram.
If it is sub-common, it should have a "mediatek,smi" phandle to point to
its smi-common. meanwhile the sub-common only has one gals clock.
Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210914113703.31466-3-yong.wu@mediatek.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Diffstat (limited to 'Documentation/devicetree/bindings/memory-controllers')
| -rw-r--r-- | Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.yaml | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.yaml b/Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.yaml index 602592b6c3f5..3a82b0b27fa0 100644 --- a/Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.yaml +++ b/Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.yaml @@ -38,6 +38,7 @@ properties: - mediatek,mt8192-smi-common - mediatek,mt8195-smi-common-vdo - mediatek,mt8195-smi-common-vpp + - mediatek,mt8195-smi-sub-common - description: for mt7623 items: @@ -67,6 +68,10 @@ properties: minItems: 2 maxItems: 4 + mediatek,smi: + $ref: /schemas/types.yaml#/definitions/phandle + description: a phandle to the smi-common node above. Only for sub-common. + required: - compatible - reg @@ -93,6 +98,29 @@ allOf: - const: smi - const: async + - if: # only for sub common + properties: + compatible: + contains: + enum: + - mediatek,mt8195-smi-sub-common + then: + required: + - mediatek,smi + properties: + clock: + items: + minItems: 3 + maxItems: 3 + clock-names: + items: + - const: apb + - const: smi + - const: gals0 + else: + properties: + mediatek,smi: false + - if: # for gen2 HW that have gals properties: compatible: |