linux-kernel - Re: [PATCH V2 07/16] dt-bindings: PCI: designware: Add binding for CDM register check

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Date:   Mon, 15 Apr 2019 16:54:02 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Vidya Sagar <vidyas@...dia.com>
Cc:     bhelgaas@...gle.com, robh+dt@...nel.org, mark.rutland@....com,
        jonathanh@...dia.com, kishon@...com, catalin.marinas@....com,
        will.deacon@....com, lorenzo.pieralisi@....com,
        jingoohan1@...il.com, gustavo.pimentel@...opsys.com,
        mperttunen@...dia.com, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kthota@...dia.com, mmaddireddy@...dia.com, sagar.tv@...il.com
Subject: Re: [PATCH V2 07/16] dt-bindings: PCI: designware: Add binding for
 CDM register check

On Fri, Apr 05, 2019 at 01:24:34AM +0530, Vidya Sagar wrote:
> Add support to enable CDM (Configuration Dependent Module) registers check
> for any data corruption. CDM registers include standard PCIe configuration
> space registers, Port Logic registers and iATU and DMA registers.
> Refer Section S.4 of Synopsys DesignWare Cores PCI Express Controller Databook
> Version 4.90a
> 
> Signed-off-by: Vidya Sagar <vidyas@...dia.com>
> ---
> Changes since [v1]:
> * This is a new patch in v2 series
> 
>  Documentation/devicetree/bindings/pci/designware-pcie.txt | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pci/designware-pcie.txt b/Documentation/devicetree/bindings/pci/designware-pcie.txt
> index c124f9bc11f3..728281b5bcd5 100644
> --- a/Documentation/devicetree/bindings/pci/designware-pcie.txt
> +++ b/Documentation/devicetree/bindings/pci/designware-pcie.txt
> @@ -31,6 +31,10 @@ Optional properties:
>  - clock-names: Must include the following entries:
>  	- "pcie"
>  	- "pcie_bus"
> +- cdm-check: This is a boolean property and if present enables automatic
> +   checking of CDM (Configuration Dependent Module) registers for data
> +   corruption. CDM registers include configuration space registers and iATU
> +   (internal Address Translation Unit) registers.

By comparison the commit message also lists "Port Logic" and "DMA"
registers as being part of the CDM registers. Shouldn't they be part of
the bindings document as well?

Perhaps it'd also be a good idea to rename this property to something
more imperative, like "enable-cdm" or similar.

Thierry

>  RC mode:
>  - num-viewport: number of view ports configured in hardware. If a platform
>    does not specify it, the driver assumes 2.
> -- 
> 2.7.4
> 

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