linux-kernel - Re: [PATCH v7 08/11] arm64: dts: ti: k3-am62x-sk-common: Enable IPC with remote processors

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Message-ID: <f8424c7e-e778-4140-9cf9-83f43cef1a04@ti.com>
Date: Mon, 28 Apr 2025 11:24:11 -0500
From: Andrew Davis <afd@...com>
To: Judith Mendez <jm@...com>, Nishanth Menon <nm@...com>,
        Vignesh Raghavendra
	<vigneshr@...com>
CC: Tero Kristo <kristo@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof
 Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Hari Nagalla <hnagalla@...com>,
        Beleswar
 Prasad <b-padhi@...com>,
        Markus Schneider-Pargmann <msp@...libre.com>,
        Devarsh Thakkar <devarsht@...v0571a.ent.ti.com>
Subject: Re: [PATCH v7 08/11] arm64: dts: ti: k3-am62x-sk-common: Enable IPC
 with remote processors

On 4/15/25 10:31 AM, Judith Mendez wrote:
> From: Hari Nagalla <hnagalla@...com>
> 
> For each remote proc, reserve memory for IPC and bind the mailbox
> assignments. Two memory regions are reserved for each remote processor.
> The first region of 1MB of memory is used for Vring shared buffers
> and the second region is used as external memory to the remote processor
> for the resource table and for tracebuffer allocations.
> 
> Signed-off-by: Devarsh Thakkar <devarsht@...com>
> Signed-off-by: Hari Nagalla <hnagalla@...com>
> Signed-off-by: Judith Mendez <jm@...com>
> ---

Acked-by: Andrew Davis <afd@...com>

>   .../arm64/boot/dts/ti/k3-am62x-sk-common.dtsi | 34 ++++++++++++++++---
>   1 file changed, 29 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
> index d52cb2a5a589a..364b2ba6af958 100644
> --- a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
> @@ -70,6 +70,18 @@ mcu_m4fss_memory_region: m4f-memory@...00000 {
>   			no-map;
>   		};
>   
> +		wkup_r5fss0_core0_dma_memory_region: r5f-dma-memory@...00000 {
> +			compatible = "shared-dma-pool";
> +			reg = <0x00 0x9da00000 0x00 0x100000>;
> +			no-map;
> +		};
> +
> +		wkup_r5fss0_core0_memory_region: r5f-memory@...00000 {
> +			compatible = "shared-dma-pool";
> +			reg = <0x00 0x9db00000 0x00 0xc00000>;
> +			no-map;
> +		};
> +
>   		secure_tfa_ddr: tfa@...80000 {
>   			reg = <0x00 0x9e780000 0x00 0x80000>;
>   			alignment = <0x1000>;
> @@ -82,11 +94,6 @@ secure_ddr: optee@...00000 {
>   			no-map;
>   		};
>   
> -		wkup_r5fss0_core0_dma_memory_region: r5f-dma-memory@...00000 {
> -			compatible = "shared-dma-pool";
> -			reg = <0x00 0x9db00000 0x00 0xc00000>;
> -			no-map;
> -		};
>   	};
>   
>   	leds {
> @@ -476,10 +483,17 @@ cpsw3g_phy0: ethernet-phy@0 {
>   };
>   
>   &mailbox0_cluster0 {
> +	status = "okay";
> +
>   	mbox_m4_0: mbox-m4-0 {
>   		ti,mbox-rx = <0 0 0>;
>   		ti,mbox-tx = <1 0 0>;
>   	};
> +
> +	mbox_r5_0: mbox-r5-0 {
> +		ti,mbox-rx = <2 0 0>;
> +		ti,mbox-tx = <3 0 0>;
> +	};
>   };
>   
>   &mcu_m4fss {
> @@ -489,6 +503,16 @@ &mcu_m4fss {
>   	status = "okay";
>   };
>   
> +&wkup_r5fss0 {
> +	status = "okay";
> +};
> +
> +&wkup_r5fss0_core0 {
> +	mboxes = <&mailbox0_cluster0 &mbox_r5_0>;
> +	memory-region = <&wkup_r5fss0_core0_dma_memory_region>,
> +			<&wkup_r5fss0_core0_memory_region>;
> +};
> +
>   &usbss0 {
>   	bootph-all;
>   	status = "okay";