linux-kernel - Re: [PATCH 1/2] dt-bindings: display/msm: qcom,sdm845-mdss: add memory-region property

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Date:   Thu, 13 Jul 2023 18:43:06 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Amit Pundir <amit.pundir@...aro.org>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Caleb Connolly <caleb.connolly@...aro.org>,
        Bryan Donoghue <bryan.odonoghue@...aro.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Krishna Manikandan <quic_mkrishn@...cinc.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        dt <devicetree@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] dt-bindings: display/msm: qcom,sdm845-mdss: add
 memory-region property

On Thu, 13 Jul 2023 at 18:34, Amit Pundir <amit.pundir@...aro.org> wrote:
>
> On Wed, 12 Jul 2023 at 18:45, Dmitry Baryshkov
> <dmitry.baryshkov@...aro.org> wrote:
> >
> > On 12/07/2023 16:02, Amit Pundir wrote:
> > > Add and document the reserved memory region property
> > > in the qcom,sdm845-mdss schema.
> > >
> > > Signed-off-by: Amit Pundir <amit.pundir@...aro.org>
> > > ---
> > >   .../devicetree/bindings/display/msm/qcom,sdm845-mdss.yaml    | 5 +++++
> > >   1 file changed, 5 insertions(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/display/msm/qcom,sdm845-mdss.yaml b/Documentation/devicetree/bindings/display/msm/qcom,sdm845-mdss.yaml
> > > index 6ecb00920d7f..3ea1dbd7e317 100644
> > > --- a/Documentation/devicetree/bindings/display/msm/qcom,sdm845-mdss.yaml
> > > +++ b/Documentation/devicetree/bindings/display/msm/qcom,sdm845-mdss.yaml
> > > @@ -39,6 +39,11 @@ properties:
> > >     interconnect-names:
> > >       maxItems: 2
> > >
> > > +  memory-region:
> > > +    maxItems: 1
> > > +    description:
> > > +      Phandle to a node describing a reserved memory region.
> > > +
> >
> > Please add it to mdss-common.yaml instead
>
> mdss-common.yaml didn't like this property at all and
> I ran into a lot of new dtbs_check warnings:
> https://www.irccloud.com/pastebin/raw/pEYAeaB1
>
> I need some help in decoding these please.

I'm not sure what happened there (and it's hard to understand without
seeing your patch). But after applying your patch to mdss-common.yaml,
`make dt_binding_check' passes:

diff --git a/Documentation/devicetree/bindings/display/msm/mdss-common.yaml
b/Documentation/devicetree/bindings/display/msm/mdss-common.yaml
index ccd7d6417523..924fe383e4a1 100644
--- a/Documentation/devicetree/bindings/display/msm/mdss-common.yaml
+++ b/Documentation/devicetree/bindings/display/msm/mdss-common.yaml
@@ -77,6 +77,11 @@ properties:
     items:
       - description: MDSS_CORE reset

+  memory-region:
+    maxItems: 1
+    description:
+      Phandle to a node describing a reserved memory region.
+
 required:
   - reg
   - reg-names


>
> Regards,
> Amit Pundir
>
> >
> > >   patternProperties:
> > >     "^display-controller@[0-9a-f]+$":
> > >       type: object
> >
> > --
> > With best wishes
> > Dmitry
> >



-- 
With best wishes
Dmitry