linux-kernel - Re: [PATCH 4/7] arm64: dts: ti: k3-j7200-mcu: Add mcu

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Date:   Wed, 31 May 2023 22:37:38 +0530
From:   "Kumar, Udit" <u-kumar1@...com>
To:     Nishanth Menon <nm@...com>, Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Tero Kristo <kristo@...nel.org>,
        Vignesh Raghavendra <vigneshr@...com>,
        Nitin Yadav <n-yadav@...com>, Andrew Davis <afd@...com>
Subject: Re: [PATCH 4/7] arm64: dts: ti: k3-j7200-mcu: Add mcu_secproxy

Hi Nishanth

On 5/30/2023 10:28 PM, Nishanth Menon wrote:
> MCU domain has it's own secure proxy for communicating with ROM and
> for R5 micro controller firmware operations. This is in addition to
> the one in the main domain NAVSS subsystem that is used for general
> purpose communication.
>
> Describe the node for use with bootloaders and firmware that require
> this communication path which uses interrupts to corresponding micro
> controller interrupt controller. Mark the node as disabled since this
> instance does not have interrupts routed to the main processor by
> default for a complete description of the node.
>
> Signed-off-by: Nishanth Menon <nm@...com>
> ---
> New patch
>
>   arch/arm64/boot/dts/ti/k3-j7200-mcu-wakeup.dtsi | 15 +++++++++++++++
>   1 file changed, 15 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/ti/k3-j7200-mcu-wakeup.dtsi b/arch/arm64/boot/dts/ti/k3-j7200-mcu-wakeup.dtsi
> index 674e695ef844..dff23b258240 100644
> --- a/arch/arm64/boot/dts/ti/k3-j7200-mcu-wakeup.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-j7200-mcu-wakeup.dtsi
> @@ -209,6 +209,21 @@ mcu_udmap: dma-controller@...c0000 {
>   		};
>   	};
>   
> +	secure_proxy_mcu: mailbox@...80000 {
I think, we should start name as  mailbox@...80000
> +		compatible = "ti,am654-secure-proxy";
> +		#mbox-cells = <1>;
> +		reg-names = "target_data", "rt", "scfg";
> +		reg = <0x0 0x2a480000 0x0 0x80000>,
> +		      <0x0 0x2a380000 0x0 0x80000>,
> +		      <0x0 0x2a400000 0x0 0x80000>;

I think, we should have increasing order for reg. Unless there is some 
strong reason to keep in this way.

> +		/*
> +		 * Marked Disabled:
> +		 * Node is incomplete as it is meant for bootloaders and
> +		 * firmware on non-MPU processors
> +		 */
> +		status = "disabled";
> +	};
> +
>   	mcu_cpsw: ethernet@...00000 {
>   		compatible = "ti,j721e-cpsw-nuss";
>   		#address-cells = <2>;