Re: [PATCH v2 2/2] dt-bindings: i3c: silvaco,i3c-master: Add Amlogic A9 support

From: Frank Li <Frank.li@oss.nxp.com>
To: Junyi Zhao <junyi.zhao@amlogic.com>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>,
	Frank Li <Frank.Li@nxp.com>, Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Neil Armstrong <neil.armstrong@linaro.org>,
	Kevin Hilman <khilman@baylibre.com>,
	Jerome Brunet <jbrunet@baylibre.com>,
	Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
	Miquel Raynal <miquel.raynal@bootlin.com>,
	Kees Cook <kees@kernel.org>,
	"Gustavo A. R. Silva" <gustavoars@kernel.org>,
	linux-i3c@lists.infradead.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-amlogic@lists.infradead.org, imx@lists.linux.dev,
	linux-hardening@vger.kernel.org, xianwei.zhao@amlogic.com,
	Kelvin.Zhang@amlogic.com
Subject: Re: [PATCH v2 2/2] dt-bindings: i3c: silvaco,i3c-master: Add Amlogic A9 support
Date: Mon, 2 Nov 2026 16:48:47 -0500	[thread overview]
Message-ID: <aukFP7holuhVE7Vl@lizhi-Precision-Tower-5810> (raw)
In-Reply-To: <20261102-a9_i3c-v2-2-0c474bfccffa@amlogic.com>

On Mon, Nov 02, 2026 at 07:05:40PM +0800, Junyi Zhao wrote:
> Amlogic A9 SoCs integrate the Silvaco I3C IP with two controller
> instances:
>
>   - amlogic,a9-i3c for the EE domain, which takes two clocks,
>     "pclk" and "fast_clk" like the NXP variants;
>
>   - amlogic,a9-ao-i3c for the Always-On (AO) domain, which exposes
>     only "pclk": its bus clock is generated by an internal divider
>     located in the controller's own register space.
>
> Allow both compatibles with the "silvaco,i3c-master-v1" fallback and
> enforce the per-variant clock counts.
>
> Signed-off-by: Junyi Zhao <junyi.zhao@amlogic.com>
> ---
>  .../bindings/i3c/silvaco,i3c-master.yaml           | 24 ++++++++++++++++++++--
>  1 file changed, 22 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/i3c/silvaco,i3c-master.yaml b/Documentation/devicetree/bindings/i3c/silvaco,i3c-master.yaml
> index 853092f75..de1fdec65 100644
> --- a/Documentation/devicetree/bindings/i3c/silvaco,i3c-master.yaml
> +++ b/Documentation/devicetree/bindings/i3c/silvaco,i3c-master.yaml
> @@ -19,6 +19,8 @@ properties:
>            - enum:
>                - nxp,imx94-i3c
>                - nxp,imx95-i3c
> +              - amlogic,a9-i3c
> +              - amlogic,a9-ao-i3c
>            - const: silvaco,i3c-master-v1

You have drvdata for it. Needn't fallback to silvaco,i3c-master-v1

Frank
>
>    reg:
> @@ -28,14 +30,14 @@ properties:
>      maxItems: 1
>
>    clocks:
> -    minItems: 2
> +    minItems: 1
>      items:
>        - description: system clock
>        - description: bus clock
>        - description: other (slower) events clock
>
>    clock-names:
> -    minItems: 2
> +    minItems: 1
>      items:
>        - const: pclk
>        - const: fast_clk
> @@ -72,12 +74,30 @@ allOf:
>              enum:
>                - nxp,imx94-i3c
>                - nxp,imx95-i3c
> +              - amlogic,a9-i3c
>      then:
>        properties:
>          clocks:
> +          minItems: 2
>            maxItems: 2
>          clock-names:
> +          minItems: 2
>            maxItems: 2
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: amlogic,a9-ao-i3c
> +    then:
> +      properties:
> +        clocks:
> +          maxItems: 1
> +          description:
> +            The "ao" variant is the controller instance in the Always-On (AO)
> +            domain, which has no separate bus clock and derives the
> +            bus clock from an internal divider.
> +        clock-names:
> +          maxItems: 1
>
>  unevaluatedProperties: false
>
>
> --
> 2.42.0
>

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