Re: [PATCH 1/1] dt-bindings: input: touchscreen: edt-ft5x06: add edt,edt-ft5x06 for legacy platforms

[Frank Li]

On Fri, Mar 06, 2026 at 09:41:03AM +0100, Krzysztof Kozlowski wrote:
> On Thu, Mar 05, 2026 at 05:37:29PM -0500, Frank Li wrote:
> > The compatible string "edt,edt-ft5x06" has been used for more than a decade
> > on older platforms such as i.MX6 and OMAP. However, it is currently missing
> > from the binding documentation.
> >
> > Add it to the binding to document existing usage and fix the following
> > CHECK_DTBS warnings.
> >   arch/arm/boot/dts/nxp/imx/imx6dl-nit6xlite.dtb: /soc/bus@2100000/i2c@21a8000/touchscreen@38: failed to match any schema with compatible: ['edt,edt-ft5x06'
> >
> > Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
> > ---
> >  .../devicetree/bindings/input/touchscreen/edt-ft5x06.yaml        | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.yaml b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.yaml
> > index 6f90522de8c0a..213451f823369 100644
> > --- a/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.yaml
> > +++ b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.yaml
> > @@ -38,6 +38,7 @@ properties:
> >        - edt,edt-ft5306
> >        - edt,edt-ft5406
> >        - edt,edt-ft5506
> > +      - edt,edt-ft5x06 # Deprecated, not use for new platform.
>
> Then document it as deprecated one.
>
> OTOH, this above is clearly not correct because we also have
> "edt,edt-ft5506", "edt,edt-ft5x06". Just use git grep.
>
> I don't understand, though, what is the point of documenting it if there
> is no ABI implemented (nothing in the driver) and it cannot work.

binding only define ABI. Many compatible string is not existed at driver
code, especially legacy platform.

Go back this case, edt,edt-ft5(2,3,4,5)06 to use the same drvdata linux
kernel. Touchscreen is off board periphial, no spec said use which one.

Two option,
- change binding to allow edt,edt-ft5x06
- change dts to use edt,edt-ft5206 (I guess), which broken ABI. like
previous fsl,imx28-lcdif case.

Which one do you like?

Frank

>
> Best regards,
> Krzysztof
>