[PATCH v7 04/10] dt-bindings: iommu: rockchip: allow the RK3576 NPU MMU clock set

[Jiaxing Hu]

Hi Diederik,

You are right, and worse than that, this is the same thing you asked
for on v6 and I told you it was fixed.

My reply then said v7 would carry a compatible of its own and pin each
side with an allOf. It does not. What v7 actually contains is a
minItems of 2 and three descriptions ending in "RK3576 NPU MMUs only",
which is a comment, not a schema, and it leaves both of the cases you
name allowed: an rk3568-iommu with five clocks, and an RK3576 NPU MMU
with two. I do not have an explanation for the gap between what I said
and what I sent, only the fix.

v8 does what you and the bot asked for the first time. The MMU nodes
get their own compatible,

    compatible = "rockchip,rk3576-npu-iommu", "rockchip,rk3568-iommu";

the enum gains it, and an allOf pins both sides so neither can borrow
the other's clock set:

    allOf:
      - if:
          properties:
            compatible:
              contains:
                const: rockchip,rk3576-npu-iommu
        then:
          properties:
            clocks:
              minItems: 5
              maxItems: 5
            clock-names:
              items:
                - const: aclk
                - const: iface
                - const: npu
                - const: aclk_cbuf
                - const: hclk_cbuf
        else:
          properties:
            clocks:
              maxItems: 2
            clock-names:
              maxItems: 2

so every existing devicetree keeps exactly two clocks and only the new
compatible may have five. The ", RK3576 NPU MMUs only" wording goes
away with it, since the schema then says it.

The DTS patch changes with it, since v7's NPU MMU nodes use the plain
rockchip,rk3576-iommu string.

I will not claim it is fixed this time until the patch is in front of
you.

Thanks for catching it twice,
Jiaxing