linux-kernel - Re: [PATCH v4 2/2] arm64: dts: ti: k3-j722s-evm: Enable Inter-Processor Communication

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Message-ID: <bb36b4e1-c8c3-45aa-a2d2-056ef4a6e448@ti.com>
Date: Fri, 30 Aug 2024 19:27:17 +0530
From: "Kumar, Udit" <u-kumar1@...com>
To: Beleswar Padhi <b-padhi@...com>, <nm@...com>, <vigneshr@...com>,
        <kristo@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>
CC: <j-choudhary@...com>, <vaishnav.a@...com>, <afd@...com>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <u-kumar1@...com>
Subject: Re: [PATCH v4 2/2] arm64: dts: ti: k3-j722s-evm: Enable
 Inter-Processor Communication


On 8/29/2024 11:39 AM, Beleswar Padhi wrote:
> From: Apurva Nandan <a-nandan@...com>
>
> The K3 J722S-EVM platform is based on the J722S SoC which has one
> single-core Arm Cortex-R5F processor in each of the WAKEUP, MCU and MAIN
> voltage domain, and two C71x DSP subsystems in MAIN voltage domain.
>
> The Inter-Processor communication between the A72 cores and these R5F

Should be A53 core not A72

> and DSP remote cores is achieved through shared memory and Mailboxes.
> Thus, add the memory carveouts and enable the mailbox clusters required
> for communication.
>
> Also, The remoteproc firmware like of R5F and DSPs in the MAIN voltage
> domain use timers. Therefore, change the status of the timer nodes to
> "reserved" to avoid any clash during booting of remotecores. Usage is
> described as below:
>
> 	+===================+=============+
> 	|  Remoteproc Node  | Timer Node  |
> 	+===================+=============+
> 	| main_r5fss0_core0 | main_timer0 |
> 	+-------------------+-------------+
> 	| c7x_0             | main_timer1 |
> 	+-------------------+-------------+
> 	| c7x_1             | main_timer2 |
> 	+-------------------+-------------+
>
> Signed-off-by: Apurva Nandan <a-nandan@...com>
> [ Enabled mailbox instances and Reserved timer nodes ]
> Signed-off-by: Beleswar Padhi <b-padhi@...com>
> [..]
>   
> +&mailbox0_cluster0 {
> +	status = "okay";
> +
> +	mbox_r5_0: mbox-r5-0 {

Could you choose name like mbox_wkup_r5_0 like other name of mbox


> +		ti,mbox-rx = <0 0 0>;
> +		ti,mbox-tx = <1 0 0>;
> +	};
> +};
> +
> +&mailbox0_cluster1 {
> +	status = "okay";
> +
> +	mbox_mcu_r5_0: mbox-mcu-r5-0 {
> +		ti,mbox-rx = <0 0 0>;
> +		ti,mbox-tx = <1 0 0>;
> [..]