Re: [PATCH 2/8] dt-bindings: display: mxsfb: Add and fix compatible strings

[Stefan Agner <stefan@agner.ch>]

On 2020-08-13 03:29, Laurent Pinchart wrote:
> Additional compatible strings have been added in DT source for the
> i.MX6SL, i.MX6SLL, i.MX6UL and i.MX7D without updating the bindings.
> Most of the upstream DT sources use the fsl,imx28-lcdif compatible
> string, which mostly predates the realization that the LCDIF in the
> i.MX6 and newer SoCs have extra features compared to the i.MX28.

Agreed, we should add fsl,imx6sx-lcdif for those devices.

But shouldn't we also keep fsl,imx28-lcdif? From what I can tell, the
devices can be driven by a driver only supporting fsl,imx28-lcdif
semantics, right?

--
Stefan

> 
> Update the bindings to add the missing compatible strings, with the
> correct fallback values. This fails to validate some of the upstream DT
> sources. Instead of adding the incorrect compatible fallback to the
> binding, the sources should be updated separately.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> ---
>  .../devicetree/bindings/display/mxsfb.yaml     | 18 +++++++++++++-----
>  1 file changed, 13 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/mxsfb.yaml
> b/Documentation/devicetree/bindings/display/mxsfb.yaml
> index 202381ec5bb7..ec6533b1d4a3 100644
> --- a/Documentation/devicetree/bindings/display/mxsfb.yaml
> +++ b/Documentation/devicetree/bindings/display/mxsfb.yaml
> @@ -15,11 +15,19 @@ description: |
>  
>  properties:
>    compatible:
> -    enum:
> -      - fsl,imx23-lcdif
> -      - fsl,imx28-lcdif
> -      - fsl,imx6sx-lcdif
> -      - fsl,imx8mq-lcdif
> +    oneOf:
> +      - enum:
> +          - fsl,imx23-lcdif
> +          - fsl,imx28-lcdif
> +          - fsl,imx6sx-lcdif
> +      - items:
> +        - enum:
> +          - fsl,imx6sl-lcdif
> +          - fsl,imx6sll-lcdif
> +          - fsl,imx6ul-lcdif
> +          - fsl,imx7d-lcdif
> +          - fsl,imx8mq-lcdif
> +        - const: fsl,imx6sx-lcdif
>  
>    reg:
>      maxItems: 1