linux-kernel - Re: [PATCH v2 2/4] dt-bindings: iommu: rockchip: Add compatible for v2

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Date:   Tue, 04 May 2021 11:15:54 +0100
From:   "Ezequiel Garcia" <ezequiel.garcia@...labora.com>
To:     "Rob Herring" <robh@...nel.org>
Cc:     "Benjamin Gaignard" <benjamin.gaignard@...labora.com>,
        joro@...tes.org, will@...nel.org, heiko@...ech.de,
        xxm@...k-chips.com, iommu@...ts.linux-foundation.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com
Subject: Re: [PATCH v2 2/4] dt-bindings: iommu: rockchip: Add compatible for v2

Hi Rob,
 
On Friday, April 30, 2021 22:34 -03, Rob Herring <robh@...nel.org> wrote: 
 
> On Thu, Apr 22, 2021 at 04:16:00PM +0200, Benjamin Gaignard wrote:
> > Add compatible for the second version of IOMMU hardware block.
> > RK356x IOMMU can also be link to a power domain.
> > 
> > Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
> > ---
> > version 2:
> >  - Add power-domains property
> > 
> >  .../devicetree/bindings/iommu/rockchip,iommu.yaml          | 7 ++++++-
> >  1 file changed, 6 insertions(+), 1 deletion(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/iommu/rockchip,iommu.yaml b/Documentation/devicetree/bindings/iommu/rockchip,iommu.yaml
> > index 0db208cf724a..e54353ccd1ec 100644
> > --- a/Documentation/devicetree/bindings/iommu/rockchip,iommu.yaml
> > +++ b/Documentation/devicetree/bindings/iommu/rockchip,iommu.yaml
> > @@ -19,7 +19,9 @@ description: |+
> >  
> >  properties:
> >    compatible:
> > -    const: rockchip,iommu
> > +    enum:
> > +      - rockchip,iommu
> > +      - rockchip,iommu-v2
> 
> This should be SoC specific.
> 

It seems iommu-v2 is really the name Rockchip gives to this IOMMU IP core.
Can we keep the "rockchip,iommu-v2" compatible, and add SoC-specific ones, as we normally do:

compatible = "rockchip,rk3568-iommu", "rockchip,iommu-v2";

Just like we'd do with any peripheral:

compatible = "st,stm32-dwmac", "snps,dwmac-3.50a";

Thanks!
Ezequiel