Re: [PATCH v2] dt-bindings: media: nxp,imx7-mipi-csi2: Drop bad if/then schema

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hi Rob,

Thank you for the patch.

On Fri, Dec 03, 2021 at 10:48:28AM -0600, Rob Herring wrote:
> The if/then schema for 'data-lanes' doesn't work as 'compatible' is at a
> different level than 'data-lanes'. To make it work, the if/then schema
> would have to be moved to the top level and then whole hierarchy of
> nodes down to 'data-lanes' created. I don't think it is worth the
> complexity to do that, so let's just drop it.
> 
> The error in this schema is masked by a fixup in the tools causing the
> 'allOf' to get overwritten. Removing the fixup as part of moving to
> json-schema draft 2019-09 revealed the issue:
> 
> Documentation/devicetree/bindings/media/nxp,imx7-mipi-csi2.example.dt.yaml: mipi-csi@30750000: ports:port@0:endpoint:data-lanes:0: [1] is too short
> 	From schema: /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/media/nxp,imx7-mipi-csi2.yaml
> Documentation/devicetree/bindings/media/nxp,imx7-mipi-csi2.example.dt.yaml: mipi-csi@32e30000: ports:port@0:endpoint:data-lanes:0: [1, 2, 3, 4] is too long
> 	From schema: /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/media/nxp,imx7-mipi-csi2.yaml
> 
> The if condition was always true because 'compatible' did not exist in
> 'endpoint' node and a non-existent property is true for json-schema.
> 
> Fixes: 85b62ff2cb97 ("media: dt-bindings: media: nxp,imx7-mipi-csi2: Add i.MX8MM support")
> Cc: Rui Miguel Silva <rmfrfs@gmail.com>
> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
> Cc: Shawn Guo <shawnguo@kernel.org>
> Cc: Sascha Hauer <s.hauer@pengutronix.de>
> Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
> Cc: Fabio Estevam <festevam@gmail.com>
> Cc: NXP Linux Team <linux-imx@nxp.com>
> Cc: linux-media@vger.kernel.org
> Cc: linux-arm-kernel@lists.infradead.org
> Signed-off-by: Rob Herring <robh@kernel.org>

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> ---
> v2:
>  - Add note that imx7 only supports 2 lanes
> ---
>  .../bindings/media/nxp,imx7-mipi-csi2.yaml         | 14 ++------------
>  1 file changed, 2 insertions(+), 12 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/media/nxp,imx7-mipi-csi2.yaml b/Documentation/devicetree/bindings/media/nxp,imx7-mipi-csi2.yaml
> index 877183cf4278..1ef849dc74d7 100644
> --- a/Documentation/devicetree/bindings/media/nxp,imx7-mipi-csi2.yaml
> +++ b/Documentation/devicetree/bindings/media/nxp,imx7-mipi-csi2.yaml
> @@ -79,6 +79,8 @@ properties:
>  
>              properties:
>                data-lanes:
> +                description:
> +                  Note that 'fsl,imx7-mipi-csi2' only supports up to 2 data lines.
>                  items:
>                    minItems: 1
>                    maxItems: 4
> @@ -91,18 +93,6 @@ properties:
>              required:
>                - data-lanes
>  
> -            allOf:
> -              - if:
> -                  properties:
> -                    compatible:
> -                      contains:
> -                        const: fsl,imx7-mipi-csi2
> -                then:
> -                  properties:
> -                    data-lanes:
> -                      items:
> -                        maxItems: 2
> -
>        port@1:
>          $ref: /schemas/graph.yaml#/properties/port
>          description:

-- 
Regards,

Laurent Pinchart