linux-kernel - Re: [PATCH V2 3/4] media: dt-bindings: ti,ds90ub960: Add support for DS90UB954-Q1

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Message-ID: <20251205151737.GB158904-robh@kernel.org>
Date: Fri, 5 Dec 2025 09:17:37 -0600
From: Rob Herring <robh@...nel.org>
To: Yemike Abhilash Chandra <y-abhilashchandra@...com>
Cc: tomi.valkeinen@...asonboard.com, mchehab@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, hverkuil@...all.nl,
	sakari.ailus@...ux.intel.com, laurent.pinchart@...asonboard.com,
	hansg@...nel.org, mehdi.djait@...ux.intel.com, ribalda@...omium.org,
	git@...tzsch.eu, vladimir.zapolskiy@...aro.org,
	benjamin.mugnier@...s.st.com, dongcheng.yan@...el.com,
	u-kumar1@...com, jai.luthra@...ux.dev, linux-media@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 3/4] media: dt-bindings: ti,ds90ub960: Add support for
 DS90UB954-Q1

On Tue, Dec 02, 2025 at 03:52:07PM +0530, Yemike Abhilash Chandra wrote:
> DS90UB954-Q1 is an FPDLink-III deserializer that is mostly register
> compatible with DS90UB960-Q1. The main difference is that it supports
> half of the RX and TX ports, i.e. 2x FPDLink RX ports and 1x CSI TX
> port. Therefore, add support for DS90UB954 within the existing bindings.
> 
> Link: https://www.ti.com/lit/gpn/ds90ub954-q1
> Signed-off-by: Yemike Abhilash Chandra <y-abhilashchandra@...com>
> ---
>  .../bindings/media/i2c/ti,ds90ub960.yaml      | 300 +++++++++++++++---
>  1 file changed, 264 insertions(+), 36 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/ti,ds90ub960.yaml b/Documentation/devicetree/bindings/media/i2c/ti,ds90ub960.yaml
> index 6a78288aebaa..1ef977c2e479 100644
> --- a/Documentation/devicetree/bindings/media/i2c/ti,ds90ub960.yaml
> +++ b/Documentation/devicetree/bindings/media/i2c/ti,ds90ub960.yaml
> @@ -13,12 +13,10 @@ description:
>    The TI DS90UB9XX devices are FPD-Link video deserializers with I2C and GPIO
>    forwarding.
>  
> -allOf:
> -  - $ref: /schemas/i2c/i2c-atr.yaml#
> -
>  properties:
>    compatible:
>      enum:
> +      - ti,ds90ub954-q1
>        - ti,ds90ub960-q1
>        - ti,ds90ub9702-q1
>  
> @@ -129,39 +127,6 @@ properties:
>        Ports represent FPD-Link inputs to the deserializer and CSI TX outputs from the deserializer.
>        Their number is model-dependent.
>  
> -    properties:
> -      port@0:
> -        $ref: '#/$defs/FPDLink-input-port'
> -        description: FPD-Link input 0
> -
> -      port@1:
> -        $ref: '#/$defs/FPDLink-input-port'
> -        description: FPD-Link input 1
> -
> -      port@2:
> -        $ref: '#/$defs/FPDLink-input-port'
> -        description: FPD-Link input 2
> -
> -      port@3:
> -        $ref: '#/$defs/FPDLink-input-port'
> -        description: FPD-Link input 3
> -
> -      port@4:
> -        $ref: '#/$defs/CSI2-output-port'
> -        description: CSI-2 Output 0
> -
> -      port@5:
> -        $ref: '#/$defs/CSI2-output-port'
> -        description: CSI-2 Output 1
> -
> -    required:
> -      - port@0
> -      - port@1
> -      - port@2
> -      - port@3
> -      - port@4
> -      - port@5
> -
>  required:
>    - compatible
>    - reg
> @@ -204,9 +169,86 @@ $defs:
>            - data-lanes
>            - link-frequencies
>  
> +allOf:
> +  - $ref: /schemas/i2c/i2c-atr.yaml#
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - ti,ds90ub960-q1
> +              - ti,ds90ub9702-q1
> +    then:
> +      properties:
> +        ports:
> +          properties:
> +            port@0:
> +              $ref: '#/$defs/FPDLink-input-port'
> +              description: FPD-Link input 0
> +
> +            port@1:
> +              $ref: '#/$defs/FPDLink-input-port'
> +              description: FPD-Link input 1
> +
> +            port@2:
> +              $ref: '#/$defs/FPDLink-input-port'
> +              description: FPD-Link input 2
> +
> +            port@3:
> +              $ref: '#/$defs/FPDLink-input-port'
> +              description: FPD-Link input 3
> +
> +            port@4:
> +              $ref: '#/$defs/CSI2-output-port'
> +              description: CSI-2 Output 0
> +
> +            port@5:
> +              $ref: '#/$defs/CSI2-output-port'
> +              description: CSI-2 Output 1
> +
> +          required:
> +            - port@0
> +            - port@1
> +            - port@2
> +            - port@3
> +            - port@4
> +            - port@5
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: ti,ds90ub954-q1
> +    then:
> +      properties:
> +        ports:
> +          properties:
> +            port@0:
> +              $ref: '#/$defs/FPDLink-input-port'
> +              description: FPD-Link input 0
> +
> +            port@1:
> +              $ref: '#/$defs/FPDLink-input-port'
> +              description: FPD-Link input 1
> +
> +            port@2:
> +              $ref: '#/$defs/CSI2-output-port'
> +              description: CSI-2 Output 0

Wouldn't making this port@4 be more compatible?

> +
> +          required:
> +            - port@0
> +            - port@1
> +            - port@2
> +
> +        links:
> +          properties:
> +            link@2: false
> +            link@3: false
> +
>  unevaluatedProperties: false
>  
>  examples:
> +  # Example with ds90ub960 Deserializer
>    - |
>      #include <dt-bindings/gpio/gpio.h>
>  
> @@ -406,4 +448,190 @@ examples:
>          };
>        };
>      };
> +
> +  # Example with ds90ub954 Deserializer
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>

I don't think we really need a whole other example for something 
that's a subset.

Rob