linux-kernel - Re: [PATCH 1/2] dt-bindings: PCI: mediatek-gen3: Add support for MT8195

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Date:   Tue, 1 Jun 2021 13:49:54 +0800
From:   Jianjun Wang <jianjun.wang@...iatek.com>
To:     Chen-Yu Tsai <wenst@...omium.org>
CC:     Ryder Lee <ryder.lee@...iatek.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <linux-pci@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Randy Wu <Randy.Wu@...iatek.com>, <youlin.pei@...iatek.com>
Subject: Re: [PATCH 1/2] dt-bindings: PCI: mediatek-gen3: Add support for
 MT8195

On Tue, 2021-06-01 at 11:53 +0800, Chen-Yu Tsai wrote:
> Hi,
> 
> On Tue, Jun 1, 2021 at 10:50 AM Jianjun Wang <jianjun.wang@...iatek.com> wrote:
> >
> > MT8195 is an ARM platform SoC which has the same PCIe IP with MT8192.
> 
> Based on what I'm seeing internally, there seems to be some inconsistency
> across the MediaTek platform on whether new compatible strings should be
> introduced for "fully compatible" IP blocks.
> 
> If this hardware block in MT8195 is "the same" as the one in MT8192, do we
> really need the new compatible string? Are there any concerns?

Hi Chen-Yu,

It's ok to reuse the compatible string with MT8192, but I think this
will be easier to find which platforms this driver is compatible with,
especially when we have more and more platforms in the future.

Thanks. 
> 
> 
> Thanks
> ChenYu
> 
> 
> > Signed-off-by: Jianjun Wang <jianjun.wang@...iatek.com>
> > ---
> >  Documentation/devicetree/bindings/pci/mediatek-pcie-gen3.yaml | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/Documentation/devicetree/bindings/pci/mediatek-pcie-gen3.yaml b/Documentation/devicetree/bindings/pci/mediatek-pcie-gen3.yaml
> > index e7b1f9892da4..d5e4a3e63d97 100644
> > --- a/Documentation/devicetree/bindings/pci/mediatek-pcie-gen3.yaml
> > +++ b/Documentation/devicetree/bindings/pci/mediatek-pcie-gen3.yaml
> > @@ -48,7 +48,9 @@ allOf:
> >
> >  properties:
> >    compatible:
> > -    const: mediatek,mt8192-pcie
> > +    oneOf:
> > +      - const: mediatek,mt8192-pcie
> > +      - const: mediatek,mt8195-pcie
> >
> >    reg:
> >      maxItems: 1
> > --
> > 2.18.0
> > _______________________________________________
> > Linux-mediatek mailing list
> > Linux-mediatek@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-mediatek

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