linux-kernel - Re: [PATCH v3 1/6] dt-bindings: lcdif: Add i.MX93 LCDIF support

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Date:   Wed, 15 Feb 2023 15:49:56 +0800
From:   Liu Ying <victor.liu@....com>
To:     Alexander Stein <alexander.stein@...tq-group.com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     marex@...x.de, stefan@...er.ch, airlied@...il.com, daniel@...ll.ch,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com,
        krzysztof.kozlowski@...aro.org, LW@...o-electronics.de
Subject: Re: [PATCH v3 1/6] dt-bindings: lcdif: Add i.MX93 LCDIF support

On Wed, 2023-02-15 at 08:26 +0100, Alexander Stein wrote:
> Hi Liu,

Hi Alexander,

> 
> thanks for the update.

Thanks for the review.

> 
> Am Montag, 13. Februar 2023, 09:56:07 CET schrieb Liu Ying:
> > There is one LCDIF embedded in i.MX93 SoC to connect with
> > MIPI DSI controller through LCDIF cross line pattern(controlled
> > by mediamix blk-ctrl) or connect with LVDS display bridge(LDB)
> > directly or connect with a parallel display through parallel
> > display format(also controlled by mediamix blk-ctrl).  i.MX93
> > LCDIF IP is essentially the same to i.MX8MP LCDIF IP.  Add device
> > tree binding for i.MX93 LCDIF.
> > 
> > Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> > Reviewed-by: Marek Vasut <marex@...x.de>
> > Signed-off-by: Liu Ying <victor.liu@....com>
> > ---
> > v2->v3:
> > * No change.
> > 
> > v1->v2:
> > * Add Krzysztof's A-b and Marek's R-b tags on patch 1/6.
> > 
> >  Documentation/devicetree/bindings/display/fsl,lcdif.yaml | 7
> > ++++++-
> >  1 file changed, 6 insertions(+), 1 deletion(-)
> > 
> > diff --git
> > a/Documentation/devicetree/bindings/display/fsl,lcdif.yaml
> > b/Documentation/devicetree/bindings/display/fsl,lcdif.yaml index
> > 75b4efd70ba8..fc11ab5fc465 100644
> > --- a/Documentation/devicetree/bindings/display/fsl,lcdif.yaml
> > +++ b/Documentation/devicetree/bindings/display/fsl,lcdif.yaml
> > @@ -21,6 +21,7 @@ properties:
> >            - fsl,imx28-lcdif
> >            - fsl,imx6sx-lcdif
> >            - fsl,imx8mp-lcdif
> > +          - fsl,imx93-lcdif
> >        - items:
> >            - enum:
> >                - fsl,imx6sl-lcdif
> > @@ -88,7 +89,9 @@ allOf:
> >        properties:
> >          compatible:
> >            contains:
> > -            const: fsl,imx8mp-lcdif
> > +            enum:
> > +              - fsl,imx8mp-lcdif
> > +              - fsl,imx93-lcdif
> >      then:
> >        properties:
> >          clocks:
> > @@ -107,6 +110,7 @@ allOf:
> >                enum:
> >                  - fsl,imx6sx-lcdif
> >                  - fsl,imx8mp-lcdif
> > +                - fsl,imx93-lcdif
> >      then:
> >        properties:
> >          clocks:
> > @@ -123,6 +127,7 @@ allOf:
> >                - fsl,imx8mm-lcdif
> >                - fsl,imx8mn-lcdif
> >                - fsl,imx8mp-lcdif
> > +              - fsl,imx93-lcdif
> >      then:
> >        required:
> >          - power-domains
> 
> I would have expected that fsl,imx93-lcdif supports up to 3 endpoints
> (MIPI 
> DSI, LVDS, and parallel) in a 'ports' subnode. But this binding only
> supports 
> a single 'port' sub-node. Also an example for this case might be very
> helpful.

The port node allows multiple endpoints(See graph.yaml[1]).  It's
enough to use the existing port node instead of using ports node.

For i.MX93 LCDIF, the port node will be something like this:
--------------------8<--------------------------
port {
        #address-cells = <1>;
        #size-cells = <0>;

        lcdif_to_pdfc: endpoint@0 {
                reg = <0>;
        };

        lcdif_to_ldb: endpoint@1 {
                reg = <1>;
        };

        lcdif_to_cross_line_pattern: endpoint@2 {
                reg = <2>;
        };
};
--------------------8<--------------------------

Looks like it's not necessary to add a specifc example for i.MX93
LCDIF.

[1] 
https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/graph.yaml#L48

Regards,
Liu Ying