linux-kernel - Re: [PATCH v16 4/5] dt-bindings: arm-smmu: Add bindings for qcom,smmu-v2

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Date:   Mon, 1 Oct 2018 13:18:57 +0100
From:   Will Deacon <will.deacon@....com>
To:     Vivek Gautam <vivek.gautam@...eaurora.org>
Cc:     joro@...tes.org, robh+dt@...nel.org, robin.murphy@....com,
        iommu@...ts.linux-foundation.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, alex.williamson@...hat.com,
        mark.rutland@....com, rjw@...ysocki.net, robdclark@...il.com,
        linux-pm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        sboyd@...nel.org, tfiga@...omium.org, jcrouse@...eaurora.org,
        sricharan@...eaurora.org, m.szyprowski@...sung.com,
        architt@...eaurora.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v16 4/5] dt-bindings: arm-smmu: Add bindings for
 qcom,smmu-v2

On Thu, Aug 30, 2018 at 08:15:40PM +0530, Vivek Gautam wrote:
> Add bindings doc for Qcom's smmu-v2 implementation.
> 
> Signed-off-by: Vivek Gautam <vivek.gautam@...eaurora.org>
> Reviewed-by: Tomasz Figa <tfiga@...omium.org>
> Tested-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
>  .../devicetree/bindings/iommu/arm,smmu.txt         | 39 ++++++++++++++++++++++
>  1 file changed, 39 insertions(+)

It would be nice to have an Ack from a DT maintainer on this, since it's
adding new compatible strings...

Will

> diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.txt b/Documentation/devicetree/bindings/iommu/arm,smmu.txt
> index 8a6ffce12af5..a6504b37cc21 100644
> --- a/Documentation/devicetree/bindings/iommu/arm,smmu.txt
> +++ b/Documentation/devicetree/bindings/iommu/arm,smmu.txt
> @@ -17,10 +17,16 @@ conditions.
>                          "arm,mmu-401"
>                          "arm,mmu-500"
>                          "cavium,smmu-v2"
> +                        "qcom,smmu-v2"
>  
>                    depending on the particular implementation and/or the
>                    version of the architecture implemented.
>  
> +                  Qcom SoCs must contain, as below, SoC-specific compatibles
> +                  along with "qcom,smmu-v2":
> +                  "qcom,msm8996-smmu-v2", "qcom,smmu-v2",
> +                  "qcom,sdm845-smmu-v2", "qcom,smmu-v2".
> +
>  - reg           : Base address and size of the SMMU.
>  
>  - #global-interrupts : The number of global interrupts exposed by the
> @@ -71,6 +77,22 @@ conditions.
>                    or using stream matching with #iommu-cells = <2>, and
>                    may be ignored if present in such cases.
>  
> +- clock-names:    List of the names of clocks input to the device. The
> +                  required list depends on particular implementation and
> +                  is as follows:
> +                  - for "qcom,smmu-v2":
> +                    - "bus": clock required for downstream bus access and
> +                             for the smmu ptw,
> +                    - "iface": clock required to access smmu's registers
> +                               through the TCU's programming interface.
> +                  - unspecified for other implementations.
> +
> +- clocks:         Specifiers for all clocks listed in the clock-names property,
> +                  as per generic clock bindings.
> +
> +- power-domains:  Specifiers for power domains required to be powered on for
> +                  the SMMU to operate, as per generic power domain bindings.
> +
>  ** Deprecated properties:
>  
>  - mmu-masters (deprecated in favour of the generic "iommus" binding) :
> @@ -137,3 +159,20 @@ conditions.
>                  iommu-map = <0 &smmu3 0 0x400>;
>                  ...
>          };
> +
> +	/* Qcom's arm,smmu-v2 implementation */
> +	smmu4: iommu@...000 {
> +		compatible = "qcom,msm8996-smmu-v2", "qcom,smmu-v2";
> +		reg = <0xd00000 0x10000>;
> +
> +		#global-interrupts = <1>;
> +		interrupts = <GIC_SPI 73 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 320 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 321 IRQ_TYPE_LEVEL_HIGH>;
> +		#iommu-cells = <1>;
> +		power-domains = <&mmcc MDSS_GDSC>;
> +
> +		clocks = <&mmcc SMMU_MDP_AXI_CLK>,
> +			 <&mmcc SMMU_MDP_AHB_CLK>;
> +		clock-names = "bus", "iface";
> +	};
> -- 
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
>