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Message-ID: <2945c7f7-a847-4a7f-b075-70c1b4e6e7dc@ixit.cz>
Date: Thu, 21 Dec 2023 23:18:54 +0100
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Subject: Re: [PATCH v6] dt-bindings: iommu: Convert msm,iommu-v0 to yaml
To: Rob Herring <robh@kernel.org>,
 Sricharan Ramabadhran <quic_srichara@quicinc.com>
Cc: Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
 Robin Murphy <robin.murphy@arm.com>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
 Conor Dooley <conor+dt@kernel.org>, Bjorn Andersson <andersson@kernel.org>,
 Konrad Dybcio <konrad.dybcio@linaro.org>, iommu@lists.linux.dev,
 devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
 linux-arm-msm@vger.kernel.org
References: <20231219202907.186381-1-david@ixit.cz>
 <20231221134121.GA3660857-robh@kernel.org>
Content-Language: en-US
From: David Heidelberg <david@ixit.cz>
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In-Reply-To: <20231221134121.GA3660857-robh@kernel.org>
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On 21/12/2023 14:41, Rob Herring wrote:
> On Tue, Dec 19, 2023 at 09:28:27PM +0100, David Heidelberg wrote:
>> Convert Qualcomm IOMMU v0 implementation to yaml format.
>>
>> iommus part being ommited for the other bindings, as mdp4 one.
>>
>> Signed-off-by: David Heidelberg <david@ixit.cz>
>> ---
>> v6:
>>   - clean iommu-cells description (thx @Robin)
>> v5:
>>   - updated example (thx @Konrad)
>>   - ordering of requirements + dropped > and | and reformatted (thx @Konrad)
>> v4:
>>   - renamed to qcom,apq8064-iommu as Rob requested
>>   - changed title to Qualcomm APQ8064 IOMMU
>>   - dropped quotes around URLs
>>   - dropped mdp node
>>   - dropped unused mdp_port0 label
>>
>> v3:
>>   - I kept the name as -v0, since we have other binding -v1 and it look
>>     good, I can change thou in v4 if requested.
>>   - dropped non-existent smmu_clk part (and adjusted example, which was
>>     using it)
>>   - dropped iommu description
>>   - moved iommu-cells description to the property #iommu-cells
>>
>> v2:
>>   - fix wrong path in binding $id
>>   - comment qcom,mdp4 node example (we don't want to validate it yet)
>> Signed-off-by: David Heidelberg <david@ixit.cz>
>>
>>   .../bindings/iommu/msm,iommu-v0.txt           | 64 ----------------
>>   .../bindings/iommu/qcom,apq8064-iommu.yaml    | 76 +++++++++++++++++++
>>   2 files changed, 76 insertions(+), 64 deletions(-)
>>   delete mode 100644 Documentation/devicetree/bindings/iommu/msm,iommu-v0.txt
>>   create mode 100644 Documentation/devicetree/bindings/iommu/qcom,apq8064-iommu.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/iommu/msm,iommu-v0.txt b/Documentation/devicetree/bindings/iommu/msm,iommu-v0.txt
>> deleted file mode 100644
>> index 20236385f26e..000000000000
>> --- a/Documentation/devicetree/bindings/iommu/msm,iommu-v0.txt
>> +++ /dev/null
>> @@ -1,64 +0,0 @@
>> -* QCOM IOMMU
>> -
>> -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.
>> -
>> -Required Properties:
>> -
>> -  - compatible: Must contain "qcom,apq8064-iommu".
>> -  - reg: Base address and size of the IOMMU registers.
>> -  - interrupts: Specifiers for the MMU fault interrupts. For instances that
>> -    support secure mode two interrupts must be specified, for non-secure and
>> -    secure mode, in that order. For instances that don't support secure mode a
>> -    single interrupt must be specified.
>> -  - #iommu-cells: The number of cells needed to specify the stream id. This
>> -		  is always 1.
>> -  - qcom,ncb:	  The total number of context banks in the IOMMU.
>> -  - clocks	: List of clocks to be used during SMMU register access. See
>> -		  Documentation/devicetree/bindings/clock/clock-bindings.txt
>> -		  for information about the format. For each clock specified
>> -		  here, there must be a corresponding entry in clock-names
>> -		  (see below).
>> -
>> -  - clock-names	: List of clock names corresponding to the clocks specified in
>> -		  the "clocks" property (above).
>> -		  Should be "smmu_pclk" for specifying the interface clock
>> -		  required for iommu's register accesses.
>> -		  Should be "smmu_clk" for specifying the functional clock
>> -		  required by iommu for bus accesses.
>> -
>> -Each bus master connected to an IOMMU must reference the IOMMU in its device
>> -node with the following property:
>> -
>> -  - iommus: A reference to the IOMMU in multiple cells. The first cell is a
>> -	    phandle to the IOMMU and the second cell is the stream id.
>> -	    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.
>> -
>> -Example: mdp iommu and its bus master
>> -
>> -                mdp_port0: iommu@7500000 {
>> -			compatible = "qcom,apq8064-iommu";
>> -			#iommu-cells = <1>;
>> -			clock-names =
>> -			    "smmu_pclk",
>> -			    "smmu_clk";
>> -			clocks =
>> -			    <&mmcc SMMU_AHB_CLK>,
>> -			    <&mmcc MDP_AXI_CLK>;
>> -			reg = <0x07500000 0x100000>;
>> -			interrupts =
>> -			    <GIC_SPI 63 0>,
>> -			    <GIC_SPI 64 0>;
>> -			qcom,ncb = <2>;
>> -		};
>> -
>> -		mdp: qcom,mdp@5100000 {
>> -			compatible = "qcom,mdp";
>> -			...
>> -			iommus = <&mdp_port0 0
>> -				  &mdp_port0 2>;
>> -		};
>> diff --git a/Documentation/devicetree/bindings/iommu/qcom,apq8064-iommu.yaml b/Documentation/devicetree/bindings/iommu/qcom,apq8064-iommu.yaml
>> new file mode 100644
>> index 000000000000..b9a2d02ed2e6
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/iommu/qcom,apq8064-iommu.yaml
>> @@ -0,0 +1,76 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +
>> +$id: http://devicetree.org/schemas/iommu/qcom,apq8064-iommu.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Qualcomm APQ8064 IOMMU
>> +
>> +maintainers:
>> +  - Will Deacon <will@kernel.org>
> This should be someone from QCom or that otherwise cares about this
> device.
Can I put Sricharan Ramabadhran <quic_srichara@quicinc.com> here (CCed)?
>
>> +
>> +description:
>> +  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: Each IOMMU specifier describes a single Stream ID.
>> +
>> +  qcom,ncb:
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    description: The total number of context banks in the IOMMU.
> Is there a maximum? I assume it is not 2^32.

It's signed 32-bit int (because of armv7), haven't seen any limit in the 
code . In dts there are only values 2 or 3.

Should I set min to 1 and max to (2^31)-1?

>
>> +
>> +required:
>> +  - reg
>> +  - interrupts
>> +  - clocks
>> +  - clock-names
>> +  - qcom,ncb
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/clock/qcom,mmcc-msm8960.h>
>> +    #include <dt-bindings/interrupt-controller/irq.h>
>> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
>> +
>> +    iommu@7500000 {
>> +            compatible = "qcom,apq8064-iommu";
>> +            reg = <0x07500000 0x100000>;
>> +            interrupts = <GIC_SPI 63 IRQ_TYPE_LEVEL_HIGH>,
>> +                         <GIC_SPI 64 IRQ_TYPE_LEVEL_HIGH>;
>> +            clocks = <&clk SMMU_AHB_CLK>,
>> +                     <&clk MDP_AXI_CLK>;
>> +            clock-names = "smmu_pclk",
>> +                          "iommu_clk";
>> +            #iommu-cells = <1>;
>> +            qcom,ncb = <2>;
>> +    };
>> -- 
>> 2.43.0
>>
-- 
David Heidelberg