From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 239B0CA0EE9 for ; Mon, 18 Aug 2025 17:33:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:CC:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=SxiNEnTOiIMgcErCvz6/vPTFNfqv77e2dsq9j1+gqLk=; b=LDsaX/6VKJ0jShv5R6fNd4bxEk IUPkKtF1UeKszqIz4F/SNIEIHAN8BTGeCHrMmefQljrgrWBHRrYbht9V5+IzoePY7MVCOWY/ek9DV A+DXmDLpCqYMqsfI98DfakbqlrupoyJW43edJG1mRjDNOyaXGyHs+lB+xI40yBXRQPcN6D0SwxZ2M +ls37zJL4GVJKRgSsaQ1a5MaI7UoOdqXVEUsKI/fxZXN2Dx6xDnIBsxyd6AtMNqmI8swUgpxJl99B 7aYZapmhT4CBQz2yfhJWEPLEcED+DGfjrPjTaWNAkOhB8zNY5ji3J3r3QPbAaYxnKQfbl2wpUrcEm oWbhN1Mg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uo3jI-00000008Bmw-2FDN; Mon, 18 Aug 2025 17:33:08 +0000 Received: from lelvem-ot02.ext.ti.com ([198.47.23.235]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uo2DT-00000007yCR-3KwS for linux-arm-kernel@lists.infradead.org; Mon, 18 Aug 2025 15:56:13 +0000 Received: from fllvem-sh04.itg.ti.com ([10.64.41.54]) by lelvem-ot02.ext.ti.com (8.15.2/8.15.2) with ESMTP id 57IFu7li3198155; Mon, 18 Aug 2025 10:56:07 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1755532567; bh=SxiNEnTOiIMgcErCvz6/vPTFNfqv77e2dsq9j1+gqLk=; h=Date:Subject:To:CC:References:From:In-Reply-To; b=ftLynG5mp+hJLRR0WimFRxLw2JCDTNq32taIkyAemhEhTHy+91IcNOwogrU84x4qY PGY3Rm1fy+a6sjmBMqU1+/YbqHwhRJRDKQyEz3GjQDZcRt6gCfe6D2OdCKrYR2t1aX PFZhzafVSE2FobIGI9BQw9BScMzCUOuEsbHpsZB4= Received: from DFLE109.ent.ti.com (dfle109.ent.ti.com [10.64.6.30]) by fllvem-sh04.itg.ti.com (8.18.1/8.18.1) with ESMTPS id 57IFu7oL622936 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA256 bits=128 verify=FAIL); Mon, 18 Aug 2025 10:56:07 -0500 Received: from DFLE111.ent.ti.com (10.64.6.32) by DFLE109.ent.ti.com (10.64.6.30) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.55; Mon, 18 Aug 2025 10:56:06 -0500 Received: from lelvem-mr06.itg.ti.com (10.180.75.8) by DFLE111.ent.ti.com (10.64.6.32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.55 via Frontend Transport; Mon, 18 Aug 2025 10:56:06 -0500 Received: from [10.249.141.75] ([10.249.141.75]) by lelvem-mr06.itg.ti.com (8.18.1/8.18.1) with ESMTP id 57IFu2Qm1274444; Mon, 18 Aug 2025 10:56:02 -0500 Message-ID: <146ffb9c-e0f8-479b-b6fe-322786be0e20@ti.com> Date: Mon, 18 Aug 2025 21:26:01 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 33/33] arm64: dts: ti: k3-j7*-ti-ipc-firmware: Switch MCU R5F cluster to Split-mode To: Andrew Davis , Beleswar Padhi , , , , , , CC: , , , , , "Udit Kumar" References: <20250814223839.3256046-1-b-padhi@ti.com> <20250814223839.3256046-34-b-padhi@ti.com> <9a3f4271-ada2-48aa-b99d-023619ec5e12@ti.com> Content-Language: en-US From: "Kumar, Udit" In-Reply-To: <9a3f4271-ada2-48aa-b99d-023619ec5e12@ti.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-C2ProcessedOrg: 333ef613-75bf-4e12-a4b1-8e3623f5dcea X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250818_085611_936039_C21CD76C X-CRM114-Status: GOOD ( 15.48 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hello Andrew, On 8/15/2025 9:18 PM, Andrew Davis wrote: > On 8/14/25 5:38 PM, Beleswar Padhi wrote: >> Several TI K3 SoCs like J7200, J721E, J721S2, J784S4 and J742S2 have a >> R5F cluster in the MCU domain which is configured for LockStep mode at >> the moment. The necessary support to use MCU R5F cluster in split mode >> was added in the bootloader. And the TI IPC firmware for the split >> processors is already available public. >> >> Therefore, Switch this R5F cluster to Split mode by default in all the >> boards using TI IPC Firmware config (k3-j7*-ti-ipc-firmware). This >> gives out an extra general purpose R5F core free to run any applications >> as required. Lockstep mode remains default in the SoC level dtsi, so >> downstream board dts which do not use TI IPC Firmware config should not >> be impacted by this switch. >> >> Users who prefer to use the fault-tolerant lockstep mode with TI IPC >> firmware config, can do that by setting `ti,cluster-mode` property to 1. > > What a user prefers and other configuration like that does not belong > in devicetree, which should only describe the hardware. > > Configuration should be done using the normal methods, like kernel > cmdline, module params, ioctls, etc.. Maybe we can even set the mode > based on some signal in the firmware itself, like in the resource table. > Agreed configuration part , but as default, what this CPU should be lock-step or cluster-mode > Andrew > >> >> Signed-off-by: Beleswar Padhi >> --- >> [..]