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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2102FC19F29 for ; Thu, 28 Jul 2022 11:33:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231272AbiG1Ldx (ORCPT ); Thu, 28 Jul 2022 07:33:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35562 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230216AbiG1Ldx (ORCPT ); Thu, 28 Jul 2022 07:33:53 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 273A943312; Thu, 28 Jul 2022 04:33:52 -0700 (PDT) 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 78626106F; Thu, 28 Jul 2022 04:33:52 -0700 (PDT) Received: from bogus (e103737-lin.cambridge.arm.com [10.1.197.49]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id A91EB3F73B; Thu, 28 Jul 2022 04:33:49 -0700 (PDT) Date: Thu, 28 Jul 2022 12:33:47 +0100 From: Sudeep Holla To: Maximilian Luz Cc: Ilias Apalodimas , Krzysztof Kozlowski , Andy Gross , Bjorn Andersson , Sudeep Holla , Ard Biesheuvel , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Steev Klimaszewski , Shawn Guo , Cristian Marussi , Greg Kroah-Hartman , linux-arm-msm@vger.kernel.org, linux-efi@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 4/4] dt-bindings: firmware: Add Qualcomm UEFI Secure Application client Message-ID: <20220728113347.ver6argevzmlsc2c@bogus> References: <20220723224949.1089973-5-luzmaximilian@gmail.com> <20220726143005.wt4be7yo7sbd3xut@bogus> <829c8fee-cae5-597d-933d-784b4b57bd73@gmail.com> <20220726154138.74avqs6iqlzqpzjk@bogus> <7284953b-52bb-37ac-fbe1-1fa845c44ff9@linaro.org> <3d752603-365d-3a33-e13e-ca241cee9a11@gmail.com> <20220727132437.pjob3z2nyxsuxgam@bogus> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org On Thu, Jul 28, 2022 at 12:48:19PM +0200, Maximilian Luz wrote: [...] > > I would very much like to avoid the need for special bootloaders. The > devices we're talking about are WoA devices, meaning they _should_ > ideally boot just fine with EFI and ACPI. > Completely agreed. > From an end-user perspective, it's annoying enough that we'll have to > stick with DTs for the time being due to the use of PEPs in ACPI. But have we explored or investigated what it takes to rewrite ACPI f/w to just use standard methods ? Does it require more firmware changes or new firmware entities or impossible at any cost ? For me that is more important than just getting this one on DT. Because if you take that path, we will have to keep doing that, with loads of unnecessary drivers if they are not shared with any other SoC with DT support upstream. We might also miss chance to get things added to the ACPI spec as we don't care which means that we never be able to use ACPI on similar future platforms even though they get shipped with ACPI. It will be a loop where we constantly keep converting this ACPI shipped platform into DT upstream. IMHO we don't want to be there. -- Regards, Sudeep