linux-kernel - Re: [PATCH 20/33] arm64: dts: ti: k3-am62: Enable Mailbox nodes at the board level

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Message-ID: <20250821060324.GA7503@francesco-nb>
Date: Thu, 21 Aug 2025 08:03:24 +0200
From: Francesco Dolcini <francesco@...cini.it>
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 20/33] arm64: dts: ti: k3-am62: Enable Mailbox nodes at
 the board level

On Fri, Aug 15, 2025 at 04:08:26AM +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>
> ---
>  arch/arm64/boot/dts/ti/k3-am62-main.dtsi         | 1 +
>  arch/arm64/boot/dts/ti/k3-am62-pocketbeagle2.dts | 1 +
>  arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi       | 1 +
>  3 files changed, 3 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 df2e1b0e74a1..2140e0cdec85 100644
> --- a/arch/arm64/boot/dts/ti/k3-am62-pocketbeagle2.dts
> +++ b/arch/arm64/boot/dts/ti/k3-am62-pocketbeagle2.dts
> @@ -299,6 +299,7 @@ &epwm2 {
>  };
>  
>  &mailbox0_cluster0 {
> +	status = "okay";

add new line

>  	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 fba6f5c8d099..1c44d17281dd 100644
> --- a/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi
> @@ -1335,6 +1335,7 @@ &main_i2c3 {
>  };
>  
>  &mailbox0_cluster0 {
> +	status = "okay";

add new line

>  	mbox_m4_0: mbox-m4-0 {
>  		ti,mbox-rx = <0 0 0>;
>  		ti,mbox-tx = <1 0 0>;
> -- 
> 2.34.1
>