[PATCH 3/8] dt-bindings: display: mxsfb: Add a bus-width endpoint property

[Laurent Pinchart]

Hi Guido,

On Sat, Aug 15, 2020 at 11:28:38PM +0200, Guido Günther wrote:
> On Thu, Aug 13, 2020 at 04:29:05AM +0300, Laurent Pinchart wrote:
> > When the PCB routes the display data signals in an unconventional way,
> > the output bus width may differ from the bus width of the connected
> > panel or encoder. For instance, when a 18-bit RGB panel has its R[5:0],
> > G[5:0] and B[5:0] signals connected to LCD_DATA[7:2], LCD_DATA[15:10]
> > and LCD_DATA[23:18], the output bus width is 24 instead of 18 when the
> > signals are routed to LCD_DATA[5:0], LCD_DATA[11:6] and LCD_DATA[17:12].
> > 
> > Add a bus-width property to describe this data routing.
> > 
> > Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> > ---
> >  Documentation/devicetree/bindings/display/mxsfb.yaml | 12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/display/mxsfb.yaml b/Documentation/devicetree/bindings/display/mxsfb.yaml
> > index ec6533b1d4a3..d15bb8edc29f 100644
> > --- a/Documentation/devicetree/bindings/display/mxsfb.yaml
> > +++ b/Documentation/devicetree/bindings/display/mxsfb.yaml
> > @@ -58,6 +58,18 @@ properties:
> >          type: object
> >  
> >          properties:
> > +          data-shift:
>
> Shouldn't that be bus-width ?

Absolutely. I'll fix that.

> > +            enum: [16, 18, 24]
> > +            description: |
> > +              The output bus width. This value overrides the configuration
> > +              derived from the connected device (encoder or panel). It should
> > +              only be specified when PCB routing of the data signals require a
> > +              different bus width on the LCDIF and the connected device. For
> > +              instance, when a 18-bit RGB panel has its R[5:0], G[5:0] and
> > +              B[5:0] signals connected to LCD_DATA[7:2], LCD_DATA[15:10] and
> > +              LCD_DATA[23:18] instead of LCD_DATA[5:0], LCD_DATA[11:6] and
> > +              LCD_DATA[17:12], bus-width should be set to 24.
> > +
> >            remote-endpoint:
> >              $ref: /schemas/types.yaml#/definitions/phandle
> >  

-- 
Regards,

Laurent Pinchart