linux-kernel - Re: [PATCH v3 2/6] dt-bindings: pci: add the samsung,exynos-pcie binding

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Message-ID: <SLXP216MB0477D362203645C619958647AAEE0@SLXP216MB0477.KORP216.PROD.OUTLOOK.COM>
Date:   Thu, 5 Nov 2020 17:14:49 +0000
From:   Jingoo Han <jingoohan1@...il.com>
To:     Rob Herring <robh@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>
CC:     linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
        PCI <linux-pci@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jaehoon Chung <jh80.chung@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Han Jingoo <jingoohan1@...il.com>
Subject: Re: [PATCH v3 2/6] dt-bindings: pci: add the samsung,exynos-pcie
 binding

On 11/5/20, 10:27 AM, Rob Herring wrote:
> 
> On Thu, Nov 5, 2020 at 2:33 AM Marek Szyprowski
> <m.szyprowski@...sung.com> wrote:
> >
> > Hi Rob,
> >
> > On 04.11.2020 22:35, Rob Herring wrote:
> > > On Thu, Oct 29, 2020 at 02:40:13PM +0100, Marek Szyprowski wrote:
> > >> Add dt-bindings for the Samsung Exynos PCIe controller (Exynos5433
> > >> variant). Based on the text dt-binding posted by Jaehoon Chung.
> > >>
> > >> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> > >> Reviewed-by: Krzysztof Kozlowski <krzk@...nel.org>
> > >> ---
> > >>   .../bindings/pci/samsung,exynos-pcie.yaml     | 119 ++++++++++++++++++
> > >>   1 file changed, 119 insertions(+)
> > >>   create mode 100644 Documentation/devicetree/bindings/pci/samsung,exynos-pcie.yaml
> >
> > >> ...
> >
> > >> +  num-viewport:
> > >> +    const: 3
> > > I'm confused why you need this. This is only used with the iATU except
> > > for keystone. Platforms like Exynos with their own child bus config
> > > space accessors don't have an iATU.
> >
> > Frankly I have no idea, I don't know much about the PCI internals.
>
> Sorry, I was confused. It's fine.

I was confused, too. But, as far as I remember, I also think that viewpoint-related
setting was necessary for Exynos PCIe.
Thank you.

Best regards,
Jingoo Han

>
> Reviewed-by: Rob Herring <robh@...nel.org>
>
> Rob