linux-kernel - Re: [PATCH v4] dt-bindings: iommu: Convert msm,iommu-v0 to yaml

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Date: Sat, 16 Dec 2023 01:00:17 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: David Heidelberg <david@...t.cz>, Joerg Roedel <joro@...tes.org>,
 Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
 Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Andy Gross <agross@...nel.org>,
 Bjorn Andersson <andersson@...nel.org>
Cc: iommu@...ts.linux.dev, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v4] dt-bindings: iommu: Convert msm,iommu-v0 to yaml

On 16.12.2023 00:30, David Heidelberg wrote:
> Convert Qualcomm IOMMU v0 implementation to yaml format.
> 
> Signed-off-by: David Heidelberg <david@...t.cz>
> ---
[...]

> +description: >
Not sure if > is necessary

> +  The MSM IOMMU is an implementation compatible with the ARM VMSA short
> +  descriptor page tables. It provides address translation for bus masters
> +  outside of the CPU, each connected to the IOMMU through a port called micro-TLB.
> +
> +properties:
> +  compatible:
> +    const: qcom,apq8064-iommu
> +
> +  clocks:
> +    items:
> +      - description: interface clock for register accesses
> +      - description: functional clock for bus accesses
> +
> +  clock-names:
> +    items:
> +      - const: smmu_pclk
> +      - const: iommu_clk
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    description: Specifiers for the MMU fault interrupts.
> +    minItems: 1
> +    items:
> +      - description: non-secure mode interrupt
> +      - description: secure mode interrupt (for instances which supports it)
> +
> +  "#iommu-cells":
> +    const: 1
> +    description: |
| may not be necessary
> +      The first cell is a phandle to the IOMMU and
> +      the second cell is the stream id.
Weird wrapping

> +      A single master device can be connected to more than one iommu
> +      and multiple contexts in each of the iommu.
> +      So multiple entries are required to list all the iommus and
> +      the stream ids that the master is connected to.
> +
> +  qcom,ncb:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: The total number of context banks in the IOMMU.
> +
> +required:
> +  - clocks
> +  - clock-names
> +  - reg
> +  - interrupts
> +  - qcom,ncb
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/qcom,mmcc-msm8960.h>
> +
> +    iommu@...0000 {
> +            compatible = "qcom,apq8064-iommu";
> +            #iommu-cells = <1>;
> +            clock-names =
> +                "smmu_pclk",
> +                "iommu_clk";
> +            clocks =
> +                <&clk SMMU_AHB_CLK>,
> +                <&clk MDP_AXI_CLK>;
> +            reg = <0x07500000 0x100000>;
> +            interrupts =
> +                <0 63 0>,
> +                <0 64 0>;
> +            qcom,ncb = <2>;
2012 codestyle :D

Please update to:

iommu@...0000 {
	compatible = "qcom,apq8064-iommu";
	reg = <0x07500000 0x100000>;
	interrupts = <GIC_SPI 63 IRQ_TYPE_NONE>, //preferably fix this TYPE_NONE
		     <GIC_SPI 64 IRQ_TYPE_NONE>;
	clocks = <&clk SMMU_AHB_CLK>,
		 <&clk MDP_AXI_CLK>;
	clock-names = "smmu_pclk",
		      "iommu_clk";
	#iommu-cells = <1>;
	qcom,ncb = <2>;
};

+ Krzysztof would likely suggest to reorder the definitions and occurences
in required: to match this /\

Thanks for taking care of this old junk!

Konrad