linux-kernel - Re: [PATCH 1/3] dt-bindings: i3c: silvaco,i3c-master: add i.MX94 and i.MX95 I3C

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Message-ID: <202504210722320ac51194@mail.local>
Date: Mon, 21 Apr 2025 09:22:32 +0200
From: Alexandre Belloni <alexandre.belloni@...tlin.com>
To: carlos.song@....com
Cc: miquel.raynal@...tlin.com, Frank.Li@....com, robh@...nel.org,
	krzk+dt@...nel.org, conor+dt@...nel.org, shawnguo@...nel.org,
	s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
	conor.culhane@...vaco.com, linux-i3c@...ts.infradead.org,
	imx@...ts.linux.dev, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/3] dt-bindings: i3c: silvaco,i3c-master: add i.MX94 and
 i.MX95 I3C

On 21/04/2025 14:15:42+0800, carlos.song@....com wrote:
> From: Carlos Song <carlos.song@....com>
> 
> Add compatible string "nxp,imx94-i3c" and "nxp,imx95-i3c" for the i.MX94
> chip and i.MX95 chip. Backward is compatible with "silvaco,i3c-master-v1".
> 
> Also i.MX94 and i.MX95 I3C only need two clocks and Legacy I3C needs
> three clocks. So add restrictions for clock and clock-names properties
> for different Socs.
> 

My guess is that the IP still requires 3 clocks but the integration in
the SoC feeds the same clock to two of them. I'm not sure this change is
required.

> Signed-off-by: Carlos Song <carlos.song@....com>
> ---
>  .../bindings/i3c/silvaco,i3c-master.yaml      | 45 ++++++++++++++++---
>  1 file changed, 39 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/i3c/silvaco,i3c-master.yaml b/Documentation/devicetree/bindings/i3c/silvaco,i3c-master.yaml
> index 4fbdcdac0aee..9255d35e2854 100644
> --- a/Documentation/devicetree/bindings/i3c/silvaco,i3c-master.yaml
> +++ b/Documentation/devicetree/bindings/i3c/silvaco,i3c-master.yaml
> @@ -9,14 +9,17 @@ title: Silvaco I3C master
>  maintainers:
>    - Conor Culhane <conor.culhane@...vaco.com>
>  
> -allOf:
> -  - $ref: i3c.yaml#
> -
>  properties:
>    compatible:
> -    enum:
> -      - nuvoton,npcm845-i3c
> -      - silvaco,i3c-master-v1
> +    oneOf:
> +      - enum:
> +        - nuvoton,npcm845-i3c
> +        - silvaco,i3c-master-v1
> +      - items:
> +        - enum:
> +            - nxp,imx94-i3c
> +            - nxp,imx95-i3c
> +        - const: silvaco,i3c-master-v1
>  
>    reg:
>      maxItems: 1
> @@ -25,12 +28,14 @@ properties:
>      maxItems: 1
>  
>    clocks:
> +    minItems: 2
>      items:
>        - description: system clock
>        - description: bus clock
>        - description: other (slower) events clock
>  
>    clock-names:
> +    minItems: 2
>      items:
>        - const: pclk
>        - const: fast_clk
> @@ -46,6 +51,34 @@ required:
>    - clock-names
>    - clocks
>  
> +allOf:
> +  - $ref: i3c.yaml#
> +  # Legacy Socs need three clocks
> +  - if:
> +      properties:
> +        compatible:
> +          const: silvaco,i3c-master-v1
> +    then:
> +      properties:
> +        clocks:
> +          minItems: 3
> +        clock-names:
> +          minItems: 3
> +  # imx94 and imx95 Soc need two clocks
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - nxp,imx94-i3c
> +              - nxp,imx95-i3c
> +    then:
> +      properties:
> +        clocks:
> +          maxItems: 2
> +        clock-names:
> +          maxItems: 2
> +
>  unevaluatedProperties: false
>  
>  examples:
> -- 
> 2.34.1
> 

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com