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 89C63C636D3 for ; Wed, 1 Feb 2023 02:04:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231362AbjBACEw (ORCPT ); Tue, 31 Jan 2023 21:04:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39288 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229500AbjBACEu (ORCPT ); Tue, 31 Jan 2023 21:04:50 -0500 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id B719D3346B; Tue, 31 Jan 2023 18:04:49 -0800 (PST) Received: by linux.microsoft.com (Postfix, from userid 1127) id 8063120E0A00; Tue, 31 Jan 2023 18:04:49 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 8063120E0A00 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1675217089; bh=K0VUINE+FWJ0wLAktupeyy5kYTYECcoyHauXnAKtKLU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=LN4xzlFQpaLfmfR8ZrP/srz7jDyd5psmMwLD274w7cC11T2+eoOEv4sp48ySNhJZe fyKlpJ1YngQMf6MZWpxGzAdrj72mnLBDPoJ8DSP6tCc6k7pdTzTICUe+eDAJCn99qp L+jgLFYVQogXfrFU+cj8BqgX7nhzyZISJ9nVbeXc= Date: Tue, 31 Jan 2023 18:04:49 -0800 From: Saurabh Singh Sengar To: Rob Herring Cc: krzysztof.kozlowski+dt@linaro.org, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, daniel.lezcano@linaro.org, tglx@linutronix.de, virtualization@lists.linux-foundation.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, mikelley@microsoft.com, ssengar@microsoft.com Subject: Re: [PATCH v2 0/6] Device tree support for Hyper-V VMBus driver Message-ID: <20230201020449.GC20379@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net> References: <1675188609-20913-1-git-send-email-ssengar@linux.microsoft.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jan 31, 2023 at 02:27:51PM -0600, Rob Herring wrote: > On Tue, Jan 31, 2023 at 12:10 PM Saurabh Sengar > wrote: > > > > This set of patches expands the VMBus driver to include device tree > > support. > > > > The first two patches enable compilation of Hyper-V APIs in a non-ACPI > > build. > > > > The third patch converts the VMBus driver from acpi to more generic > > platform driver. > > > > Further to add device tree documentation for VMBus, it needs to club with > > other virtualization driver's documentation. For this rename the virtio > > folder to more generic hypervisor, so that all the hypervisor based > > devices can co-exist in a single place in device tree documentation. The > > fourth patch does this renaming. > > > > The fifth patch introduces the device tree documentation for VMBus. > > > > The sixth patch adds device tree support to the VMBus driver. Currently > > this is tested only for x86 and it may not work for other archs. > > I can read all the patches and see *what* they do. You don't really > need to list that here. I'm still wondering *why*. That is what the > cover letter and commit messages should answer. Why do you need DT > support? How does this even work on x86? FDT is only enabled for > CE4100 platform. HI Rob, Thanks for your comments. We are working on a solution where kernel is booted without ACPI tables to keep the overall system's memory footprints slim and possibly faster boot time. We have tested this by enabling CONFIG_OF for x86. I can add this info in cover letter in next version. Regards, Saurabh > > Rob