linux-kernel - Re: [PATCH V5 07/16] dt-bindings: PCI: designware: Add binding for CDM register check

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Date:   Mon, 13 May 2019 10:15:46 -0500
From:   Rob Herring <robh@...nel.org>
To:     Vidya Sagar <vidyas@...dia.com>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jon Hunter <jonathanh@...dia.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>, kthota@...dia.com,
        Manikanta Maddireddy <mmaddireddy@...dia.com>,
        sagar.tv@...il.com
Subject: Re: [PATCH V5 07/16] dt-bindings: PCI: designware: Add binding for
 CDM register check

On Tue, May 7, 2019 at 3:25 AM Vidya Sagar <vidyas@...dia.com> wrote:
>
> On 4/26/2019 8:02 PM, Rob Herring wrote:
> > On Wed, Apr 24, 2019 at 10:49:55AM +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 [v4]:
> >> * None
> >>
> >> Changes since [v3]:
> >> * None
> >>
> >> Changes since [v2]:
> >> * Changed flag name from 'cdm-check' to 'enable-cdm-check'
> >> * Added info about Port Logic and DMA registers being part of CDM
> >>
> >> Changes since [v1]:
> >> * This is a new patch in v2 series
> >>
> >>   Documentation/devicetree/bindings/pci/designware-pcie.txt | 5 +++++
> >>   1 file changed, 5 insertions(+)
> >>
> >> diff --git a/Documentation/devicetree/bindings/pci/designware-pcie.txt b/Documentation/devicetree/bindings/pci/designware-pcie.txt
> >> index 5561a1c060d0..85b872c42a9f 100644
> >> --- a/Documentation/devicetree/bindings/pci/designware-pcie.txt
> >> +++ b/Documentation/devicetree/bindings/pci/designware-pcie.txt
> >> @@ -34,6 +34,11 @@ Optional properties:
> >>   - clock-names: Must include the following entries:
> >>      - "pcie"
> >>      - "pcie_bus"
> >> +- enable-cdm-check: This is a boolean property and if present enables
> >
> > This needs a vendor prefix.
> Why only for this? Since this whole file is for Synopsys DesignWare core based PCIe IP,
> I thought there is specific prefix required. Am I wrong? Also, CDM checking is a feature
> of IP and DWC based implementations can choose either to enable this feature at hardware level
> or not. And whoever enabled it at hardware level (like Tegra194) can set this flag to
> enable corresponding software support.

TBC, I meant a Synopsys vendor prefix, not NVIDIA.

Any property that's not from a common binding should have a vendor
prefix. That hasn't always happened, so we do have lots of examples
without.

Rob