linux-kernel - Re: [PATCH v2 00/33] Refactor TI IPC DT configs into dtsi

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Message-ID: <8fea9d7d-faa0-4e51-b7a5-e17a945bf1ed@ti.com>
Date: Thu, 4 Sep 2025 15:40:50 -0500
From: Judith Mendez <jm@...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: <afd@...com>, <u-kumar1@...com>, <hnagalla@...com>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Robert Nelson
	<robertcnelson@...il.com>,
        Jo_o Paulo Gon_alves <joao.goncalves@...adex.com>,
        Parth Pancholi <parth.pancholi@...adex.com>,
        Emanuele Ghidoli
	<emanuele.ghidoli@...adex.com>,
        Francesco Dolcini
	<francesco.dolcini@...adex.com>,
        Matthias Schiffer
	<matthias.schiffer@...tq-group.com>,
        Logan Bristol
	<logan.bristol@...xas.edu>,
        Josua Mayer <josua@...id-run.com>, John Ma
	<jma@...tec.com>,
        Nathan Morrisson <nmorrisson@...tec.com>,
        Garrett Giordano
	<ggiordano@...tec.com>,
        Matt McKee <mmckee@...tec.com>, Wadim Egorov
	<w.egorov@...tec.de>,
        Andrejs Cainikovs <andrejs.cainikovs@...adex.com>,
        "Max
 Krummenacher" <max.krummenacher@...adex.com>,
        Stefan Eichenberger
	<stefan.eichenberger@...adex.com>,
        Hiago De Franco <hiago.franco@...adex.com>
Subject: Re: [PATCH v2 00/33] Refactor TI IPC DT configs into dtsi

Hi Beleswar,

On 8/23/25 11:08 AM, Beleswar Padhi wrote:
> The TI K3 SoCs have multiple programmable remote processors like
> R5F, M4F, C6x/C7x etc. The TI SDKs for these SoCs offer sample firmware
> which could be run on these cores to demonstrate an "echo" IPC test.
> Those firmware require certain memory carveouts to be reserved from
> system memory, timers to be reserved, and certain mailbox
> configurations for interrupt based messaging. These configurations
> could be different for a different firmware.
> 
> Refactor these firmware dependent configurations from board level DTS
> into a dtsi for now. This dtsi for TI IPC firmware is board-independent
> and can be applied to all boards from the same SoC Family. This gets
> rid of code duplication (>50%) and allows more freedom for users
> developing custom firmware (or no firmware) to utilize system resources
> better; easily by swapping out this dtsi. To maintain backward
> compatibility, the dtsi is included in all existing boards.
> 
> DTSI vs Overlay:
> 1. I chose DTSI over overlay as both the ways required including the
> refactored file in existing board-level files to maintain backward
> compatibility, so didn't see the advantage of using overlays here.
> 2. If we do down the overlay path, existing board-level file names have
> to be changed to indicate they are without the IPC support; so that
> they can be combined with the overlay to generate the same-named DTBs.
> For example:
> k3-am69-sk.dtb := k3-am69-sk-sans-ipc.dtb k3-j784s4-ti-ipc-firmware.dtbo
> 			     ~~~~~~~~
> 
> I am not sure if this renaming of files is ideal?
> 

Thanks for you patches, I was able to boot test on am62px SK and
am62ax SK boards. I was also able do a simple rpmsg echo test with some
additional patches on top of your changes:
https://gist.github.com/jmenti/4ae7a6a65c2cb95fd54f48d32430c1e9

so for am62ax and am62px SK boards:

Tested-by: Judith Mendez <jm@...com>