linux-kernel - Re: [PATCH v3 10/33] arm64: dts: ti: k3-am62: Enable Mailbox nodes at the board level

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Message-ID: <20250905191347.miywnqwn2jqgyptw@lcpd911>
Date: Sat, 6 Sep 2025 00:43:47 +0530
From: Dhruva Gole <d-gole@...com>
To: Beleswar Padhi <b-padhi@...com>
CC: <nm@...com>, <vigneshr@...com>, <kristo@...nel.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>, <afd@...com>,
        <u-kumar1@...com>, <hnagalla@...com>, <jm@...com>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 10/33] arm64: dts: ti: k3-am62: Enable Mailbox nodes
 at the board level

On Sep 05, 2025 at 10:48:23 +0530, Beleswar Padhi wrote:
> Mailbox nodes defined in the top-level AM62x SoC dtsi files are
> incomplete and may not be functional unless they are extended with a
> chosen interrupt and connection to a remote processor.
> 
> As the remote processors depend on memory nodes which are only known at
> the board integration level, these nodes should only be enabled when
> provided with the above information.
> 
> Disable the Mailbox nodes in the dtsi files and only enable the ones
> that are actually used on a given board.
> 
> Signed-off-by: Beleswar Padhi <b-padhi@...com>
> Acked-by: Andrew Davis <afd@...com>
> ---
> v3: Changelog:
> 1. Carried A/B tag.
> 
> Link to v2:
> https://lore.kernel.org/all/20250823160901.2177841-11-b-padhi@ti.com/
> 
> v2: Changelog:
> 1. Re-ordered patch from [PATCH 20/33] to [PATCH v2 10/33].
> 2. Added new-line before sub-nodes in mailboxes.
> 
> Link to v1:
> https://lore.kernel.org/all/20250814223839.3256046-21-b-padhi@ti.com/
> 
>  arch/arm64/boot/dts/ti/k3-am62-main.dtsi         | 1 +
>  arch/arm64/boot/dts/ti/k3-am62-pocketbeagle2.dts | 2 ++
>  arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi       | 2 ++
>  3 files changed, 5 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
> index 029380dc1a35..40fb3c9e674c 100644
> --- a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
> @@ -808,6 +808,7 @@ mailbox0_cluster0: mailbox@...00000 {
>  		#mbox-cells = <1>;
>  		ti,mbox-num-users = <4>;
>  		ti,mbox-num-fifos = <16>;
> +		status = "disabled";
>  	};
>  
>  	ecap0: pwm@...00000 {
> diff --git a/arch/arm64/boot/dts/ti/k3-am62-pocketbeagle2.dts b/arch/arm64/boot/dts/ti/k3-am62-pocketbeagle2.dts
> index 2e4cf65ee323..2eee5f638e0f 100644
> --- a/arch/arm64/boot/dts/ti/k3-am62-pocketbeagle2.dts
> +++ b/arch/arm64/boot/dts/ti/k3-am62-pocketbeagle2.dts
> @@ -293,6 +293,8 @@ &epwm2 {
>  };
>  
>  &mailbox0_cluster0 {
> +	status = "okay";
> +
>  	mbox_m4_0: mbox-m4-0 {
>  		ti,mbox-rx = <0 0 0>;
>  		ti,mbox-tx = <1 0 0>;
> diff --git a/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi b/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi
> index bc2289d74774..bbf2d630b305 100644
> --- a/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi
> @@ -1317,6 +1317,8 @@ &main_i2c3 {
>  };
>  
>  &mailbox0_cluster0 {
> +	status = "okay";
> +

Reviewed-by: Dhruva Gole <d-gole@...com>

-- 
Best regards,
Dhruva Gole
Texas Instruments Incorporated