linux-kernel - Re: [PATCH 02/10] dt-bindings: PCI: qcom: Do not require 'msi-map-mask'

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Message-ID: <Zcy4Atjmb6-wofCL@hovoldconsulting.com>
Date: Wed, 14 Feb 2024 13:54:26 +0100
From: Johan Hovold <johan@...nel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Johan Hovold <johan+linaro@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/10] dt-bindings: PCI: qcom: Do not require
 'msi-map-mask'

On Wed, Feb 14, 2024 at 01:01:20PM +0100, Krzysztof Kozlowski wrote:
> On 12/02/2024 17:50, Johan Hovold wrote:
> > Whether the 'msi-map-mask' property is needed or not depends on how the
> > MSI interrupts are mapped and it should therefore not be described as
> > required.
> 
> I could imagine that on all devices the interrupts are mapped in a way
> you need to provide msi-map-mask. IOW, can there be a Qualcomm platform
> without msi-map-mask?

I don't have access to the documentation so I'll leave that for you guys
to determine. I do note that the downstream DT does not use it and that
we have a new devicetree in linux-next which also does not have it:

	https://lore.kernel.org/r/20240125-topic-sm8650-upstream-pcie-its-v1-1-cb506deeb43e@linaro.org

But at least the latter looks like an omission that should be fixed.

Johan