Commit 599e681a authored by Yong Wu's avatar Yong Wu Committed by Krzysztof Kozlowski
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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: default avatarYong Wu <yong.wu@mediatek.com>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210914113703.31466-3-yong.wu@mediatek.com


Signed-off-by: default avatarKrzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
parent b01065ee

Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.yaml

+28 −0
Original line number Diff line number Diff line
@@ -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: