linux-kernel - Re: [PATCH] dt-bindings: firmware: fsl,scu: Mark multi-channel MU layouts as deprecated

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Message-ID: <aXesRQmY22FTVZmu@lizhi-Precision-Tower-5810>
Date: Mon, 26 Jan 2026 13:02:45 -0500
From: Frank Li <Frank.li@....com>
To: "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc: Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Dong Aisheng <aisheng.dong@....com>, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, Peng Fan <peng.fan@....com>
Subject: Re: [PATCH] dt-bindings: firmware: fsl,scu: Mark multi-channel MU
 layouts as deprecated

On Mon, Jan 26, 2026 at 11:47:02AM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
>
> The SCU MU driver has long supported the simple and efficient single-TX and

Does you means "long" is "already"

Frank
> single-RX channel layout. The older multi-channel MU configurations
> (tx0..tx3 and rx0..rx3) are less efficient in practice and not needed.
>
> Mark these legacy mbox-names and mboxes tuple layouts as deprecated in the
> binding schema. The driver continues to support them for backward
> compatibility in case firmware publishes the legacy properties.
>
> The example section is updated accordingly to demonstrate the recommended
> layout.
>
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  .../devicetree/bindings/firmware/fsl,scu.yaml        | 20 +++++++++++---------
>  1 file changed, 11 insertions(+), 9 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/firmware/fsl,scu.yaml b/Documentation/devicetree/bindings/firmware/fsl,scu.yaml
> index f9ba18f06369215691c69cdc1538b53dfd369f37..307f1c6278532ace94db92e6e8b68312eb4c8a4f 100644
> --- a/Documentation/devicetree/bindings/firmware/fsl,scu.yaml
> +++ b/Documentation/devicetree/bindings/firmware/fsl,scu.yaml
> @@ -76,7 +76,8 @@ properties:
>            - description: TX0 MU channel
>            - description: RX0 MU channel
>            - description: optional MU channel for general interrupt
> -      - items:
> +      - deprecated: true
> +        items:
>            - description: TX0 MU channel
>            - description: TX1 MU channel
>            - description: TX2 MU channel
> @@ -85,7 +86,8 @@ properties:
>            - description: RX1 MU channel
>            - description: RX2 MU channel
>            - description: RX3 MU channel
> -      - items:
> +      - deprecated: true
> +        items:
>            - description: TX0 MU channel
>            - description: TX1 MU channel
>            - description: TX2 MU channel
> @@ -105,7 +107,8 @@ properties:
>            - const: tx0
>            - const: rx0
>            - const: gip3
> -      - items:
> +      - deprecated: true
> +        items:
>            - const: tx0
>            - const: tx1
>            - const: tx2
> @@ -114,7 +117,8 @@ properties:
>            - const: rx1
>            - const: rx2
>            - const: rx3
> -      - items:
> +      - deprecated: true
> +        items:
>            - const: tx0
>            - const: tx1
>            - const: tx2
> @@ -167,11 +171,9 @@ examples:
>      firmware {
>          system-controller {
>              compatible = "fsl,imx-scu";
> -            mbox-names = "tx0", "tx1", "tx2", "tx3",
> -                         "rx0", "rx1", "rx2", "rx3",
> -                         "gip3";
> -            mboxes = <&lsio_mu1 0 0 &lsio_mu1 0 1 &lsio_mu1 0 2 &lsio_mu1 0 3
> -                      &lsio_mu1 1 0 &lsio_mu1 1 1 &lsio_mu1 1 2 &lsio_mu1 1 3
> +            mbox-names = "tx0", "rx0", "gip3";
> +            mboxes = <&lsio_mu1 0 0
> +                      &lsio_mu1 1 0
>                        &lsio_mu1 3 3>;
>
>              clock-controller {
>
> ---
> base-commit: ca3a02fda4da8e2c1cb6baee5d72352e9e2cfaea
> change-id: 20260126-scu-c93d45e319f2
>
> Best regards,
> --
> Peng Fan <peng.fan@....com>
>