linux-kernel - Re: [PATCH 02/11] dt-bindings: PCI: qcom: Add iommu properties

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Message-ID: <20230223130258.GA6422@workstation>
Date:   Thu, 23 Feb 2023 18:32:58 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     andersson@...nel.org, lpieralisi@...nel.org, robh@...nel.org,
        kw@...ux.com, krzysztof.kozlowski+dt@...aro.org, vkoul@...nel.org,
        konrad.dybcio@...aro.org, bhelgaas@...gle.com, kishon@...nel.org,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 02/11] dt-bindings: PCI: qcom: Add iommu properties

On Thu, Feb 23, 2023 at 10:37:27AM +0100, Krzysztof Kozlowski wrote:
> On 22/02/2023 16:32, Manivannan Sadhasivam wrote:
> > Most of the PCIe controllers require iommu support to function properly.
> > So let's add them to the binding.
> > 
> 
> If most of them require iommu, why not adding it as a required property
> to respective (or new) "if:then:" part?
> 

Well, I thought about it but then followed the convention of
"dma-coherent" property. I asked this same question while adding that
property but I didn't get a clear answer (or maybe I missed something).

So if you want me to add iommu properties to individual SoCs, then please
explain why the same cannot be done for "dma-coherent" as not all SoCs
support dma coherency for PCIe controllers.

Thanks,
Mani

> Best regards,
> Krzysztof
>