linux-kernel - Re: [PATCH v2 0/6] Device tree support for Hyper-V VMBus driver

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Message-ID: <CAL_JsqKL3JA6nAkEHuuyxbs8-Mm=Q-nNkCmpnDApNUDVbLsvKw@mail.gmail.com>
Date:   Tue, 31 Jan 2023 14:27:51 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Saurabh Sengar <ssengar@...ux.microsoft.com>
Cc:     krzysztof.kozlowski+dt@...aro.org, kys@...rosoft.com,
        haiyangz@...rosoft.com, wei.liu@...nel.org, decui@...rosoft.com,
        daniel.lezcano@...aro.org, tglx@...utronix.de,
        virtualization@...ts.linux-foundation.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hyperv@...r.kernel.org, mikelley@...rosoft.com,
        ssengar@...rosoft.com
Subject: Re: [PATCH v2 0/6] Device tree support for Hyper-V VMBus driver

On Tue, Jan 31, 2023 at 12:10 PM Saurabh Sengar
<ssengar@...ux.microsoft.com> 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.

Rob