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Date: Tue, 10 Aug 2021 16:08:48 +0800 From: Yong Wu <yong.wu@...iatek.com> To: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>, Rob Herring <robh+dt@...nel.org>, Matthias Brugger <matthias.bgg@...il.com> CC: Krzysztof Kozlowski <krzk@...nel.org>, Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>, Tomasz Figa <tfiga@...omium.org>, <linux-mediatek@...ts.infradead.org>, <srv_heupstream@...iatek.com>, <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>, <iommu@...ts.linux-foundation.org>, <yong.wu@...iatek.com>, <youlin.pei@...iatek.com>, <anan.sun@...iatek.com>, <ming-fan.chen@...iatek.com>, <yi.kuo@...iatek.com>, <anthony.huang@...iatek.com>, Ikjoon Jang <ikjn@...omium.org> Subject: [PATCH v3 02/13] 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. Additionally, add a new property "mediatek,smi_sub_common" for this sub-common, this is needed in the IOMMU driver in which we create a device link between smi-common and the IOMMU device. If we add the smi-sub-common here, the IOMMU driver still need to find the smi-common device. thus, add this bool property to indicate if it is sub-common. Signed-off-by: Yong Wu <yong.wu@...iatek.com> --- change note: a. change mediatek, smi type from phandle-array to phandle from Rob. b. Add a new bool property (mediatek,smi_sub_common) to indicate this is smi-sub-common. the reason is as above. --- .../mediatek,smi-common.yaml | 30 +++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.yaml b/Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.yaml index 602592b6c3f5..26bb9903864b 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 +68,14 @@ 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. + + mediatek,smi_sub_common: + type: boolean + description: Indicate if this is smi-sub-common. + required: - compatible - reg @@ -93,6 +102,27 @@ allOf: - const: smi - const: async + - if: # only for sub common + properties: + compatible: + contains: + enum: + - mediatek,mt8195-smi-sub-common + then: + required: + - mediatek,smi + - mediatek,smi_sub_common + properties: + clock: + items: + minItems: 3 + maxItems: 3 + clock-names: + items: + - const: apb + - const: smi + - const: gals0 + - if: # for gen2 HW that have gals properties: compatible: -- 2.18.0
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