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 945CDC021B2 for ; Tue, 25 Feb 2025 12:48:14 +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:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=BZgdWO7k4+OKLqpthfS5rJrQuQPttt/GmTiWB7L+cFI=; b=ogxOGDFxzQKzrM6VaRMqVYv5oO co9lNs37Ni2VwmaVXhdAvuIxSO4UecBbRxj5u93tvo/1RTea5E/Nn5+hqD8D273MX9DlBHo97Mrrd QH+iDtGFVdPEmA+6dPU1kxbNMKWEuOBMAX7f5a8bI2mmqImrRik6eXLsnyP8RacixXcMEad+I6mXN VfL28c2qL1/5voadQb/zoB0YCnWRnsQk63i/M1NU5kTA29tJKVmq9qjXVLhylgPvDOqiTe4iULcIC rV5lDV9DLWf55FIXapS5x7fclZkTIEtqensDURk+D5mgp7aw/fHu+Vf1TLyNXmH3vM8R1Ky8/5YMV I3KlxwaQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tmuM1-0000000HFnN-2cJK; Tue, 25 Feb 2025 12:48:05 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tmtib-0000000H9SR-46Ee for linux-arm-kernel@lists.infradead.org; Tue, 25 Feb 2025 12:07:23 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id D8753152B; Tue, 25 Feb 2025 04:07:37 -0800 (PST) Received: from bogus (e133711.arm.com [10.1.196.55]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 135943F6A8; Tue, 25 Feb 2025 04:07:18 -0800 (PST) Date: Tue, 25 Feb 2025 12:07:16 +0000 From: Sudeep Holla To: Vincenzo Frascino Cc: Mark Rutland , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Linus Walleij , Sudeep Holla , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Liviu Dudau , Lorenzo Pieralisi , Russell King , Will Deacon , Jessica Clarke Subject: Re: [PATCH v7 00/10] arm64: dts: Add Arm Morello support Message-ID: References: <20250221180349.1413089-1-vincenzo.frascino@arm.com> <58ee2a8d-d3c1-4bc2-92dd-6568f645b01f@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <58ee2a8d-d3c1-4bc2-92dd-6568f645b01f@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250225_040722_059506_B35205A6 X-CRM114-Status: GOOD ( 30.62 ) 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 Hi Mark, Thanks for raising valid points/concerns. On Mon, Feb 24, 2025 at 10:08:18AM +0000, Vincenzo Frascino wrote: > Hello Mark, > > On 21/02/2025 18:54, Mark Rutland wrote: > > Hi Vincenzo, > > > > On Fri, Feb 21, 2025 at 06:03:39PM +0000, Vincenzo Frascino wrote: > >> The Morello architecture is an experimental extension to Armv8.2-A, > >> which extends the AArch64 state with the principles proposed in > >> version 7 of the Capability Hardware Enhanced RISC Instructions > >> (CHERI) ISA [1]. > > > > None of the CHERI stuff is supported upstream, so from upstream's PoV > > this is a low-volume dev-board/SoC with an experimental ARMv8.2-A CPU. > > I understand and agree with your concerns. > > Agreed, I have no plans to upstream Morello support beyond the device tree. > > >> This series adds dts support for the Arm Morello System Development > >> Platform. > > > > Do we actually need the dts for this board? > > > > I have one on my desk; it boots vanilla Debian 12 via UEFI + ACPI just > > fine, with the Debian 6.1.0-13-arm64 kernel. > > > > Is there something that we can only do with the DT? i.e. some > > functionality that isn't exposed via ACPI? > > > > How do you expect this DT to be used? > > > > There are functionalities that are not exposed via ACPI, e.g. gpu, dpu, i2c for > the phy, etc. My aim to have upstream support for all the hardware exposed by > the platform. > Does this address some of your concerns ? I do understand some of these are not well addressed in ACPI and hence people use DT as an alternative. > Note: This series contains only the basic infrastructure, the plan is add > progressively more features in the future. > I was thinking of queuing this in -next if all the bindings are acked. Let me know if you still have concerns and would like to avoid getting these merged. I will hold off then. -- Regards, Sudeep