Re: [PATCH v2 2/3] dt-bindings: display: simple: support non-default data-mapping

[Johannes Zink]

Hi Laurent,

thank you for your review.

On 6/2/23 17:35, Laurent Pinchart wrote:
> Hi Johannes,
>
> Thank you for the patch.
>
> On Tue, May 23, 2023 at 10:19:42AM +0200, Johannes Zink wrote:
> > Some Displays support more than just a single default lvds data mapping,
>
> s/lvds/LVDS/

ack, gonna fix in V3

> > which can be used to run displays on only 3 LVDS lanes in the jeida-18
> > data-mapping mode.
> >
> > Add an optional data-mapping property to allow overriding the default
> > data mapping. As it does not generally apply to any display and bus: use
>
> s/bus:/bus,/

ack, gonna fix in V3

> > it selectively on the innolux,g101ice-l01, which supports changing the
> > data mapping via a strapping pin.
> >
> > Signed-off-by: Johannes Zink <j.zink@xxxxxxxxxxxxxx>
> > ---
> >
> > Changes:
> >
> > v1 -> v2: - worked in Rob's review findings (thanks for reviewing my
> >              work): use extracted common property instead of duplicating
> > 	    the property
> > 	  - refined commit message
> > 	  - add an example dts for automated checking
> > ---
> >   .../bindings/display/panel/panel-simple.yaml       | 26 +++++++++++++++++++++-
> >   1 file changed, 25 insertions(+), 1 deletion(-)
> >
> > diff --git a/Documentation/devicetree/bindings/display/panel/panel-simple.yaml b/Documentation/devicetree/bindings/display/panel/panel-simple.yaml
> > index ec50dd268314..698301c8c920 100644
> > --- a/Documentation/devicetree/bindings/display/panel/panel-simple.yaml
> > +++ b/Documentation/devicetree/bindings/display/panel/panel-simple.yaml
> > @@ -21,9 +21,9 @@ description: |
> >   
> >   allOf:
> >     - $ref: panel-common.yaml#
> > +  - $ref: ../lvds-data-mapping.yaml#
> >   
> >   properties:
> > -
> >     compatible:
> >       enum:
> >       # compatible must be listed in alphabetical order, ordered by compatible.
> > @@ -353,6 +353,17 @@ properties:
> >     power-supply: true
> >     no-hpd: true
> >     hpd-gpios: true
> > +  data-mapping: true
>
> As the property is optional, don't you need a default value ?

as the simple-bus implicitely assumes default data mappings for LVDS panels, I 
think this is not necessary. If the property is not used in a DT, the default 
data mapping is used.

Best regards
Johannes

> > +
> > +if:
> > +  not:
> > +    properties:
> > +      compatible:
> > +        contains:
> > +          const: innolux,g101ice-l01
> > +then:
> > +  properties:
> > +    data-mapping: false
> >   
> >   additionalProperties: false
> >   
> > @@ -372,3 +383,16 @@ examples:
> >           };
> >         };
> >       };
> > +  - |
> > +    panel_lvds: panel-lvds {
> > +      compatible = "innolux,g101ice-l01";
> > +      power-supply = <&vcc_lcd_reg>;
> > +
> > +      data-mapping = "jeida-24";
> > +
> > +      port {
> > +        panel_in_lvds: endpoint {
> > +          remote-endpoint = <&ltdc_out_lvds>;
> > +        };
> > +      };
> > +    };

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