linux-kernel - Re: [PATCH 0/4] Device tree support for Hyper-V VMBus driver

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Date:   Tue, 17 Jan 2023 08:35:01 -0600
From:   Rob Herring <robh@...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,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hyperv@...r.kernel.org, mikelley@...rosoft.com,
        ssengar@...rosoft.com
Subject: Re: [PATCH 0/4] Device tree support for Hyper-V VMBus driver

On Mon, Jan 16, 2023 at 08:48:04AM -0800, Saurabh Sengar wrote:
> This patch set expands the functionality of the VMBus driver by adding
> support for device tree on x86/x64 architectures.

Humm, interesting. Currently we support OLPC and CE4100 for x86 DT based 
systems. Adding a new platform implies numerous new bindings yet there 
is only 1 here. I'm guessing your DT is generated by the hypervisor, but 
an example would be nice to see and run thru dtschema validation. We've 
unfortunately been trying to fix KVM/QEMU DT years after it was created.


> The first two patches enable Hyper-V builds for non-ACPI systems, while
> the third patch adds device tree support into the VMBus driver, in
> addition to its pre-existing support for ACPI. The fourth patch includes
> the necessary device tree bindings for the VMBus driver.

Bindings come before using them...

> 
> Saurabh Sengar (4):
>   drivers/clocksource/hyper-v: non ACPI support in hyperv clock
>   Drivers: hv: allow non ACPI compilation for
>     hv_is_hibernation_supported
>   Drivers: hv: vmbus: Device Tree support
>   dt-bindings: hv: Add dt-bindings for VMBus
> 
>  .../devicetree/bindings/hv/msft,vmbus.yaml         |  34 ++++
>  drivers/clocksource/hyperv_timer.c                 |  15 +-
>  drivers/hv/hv_common.c                             |   4 +
>  drivers/hv/vmbus_drv.c                             | 190 +++++++++++++++++----
>  4 files changed, 206 insertions(+), 37 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/hv/msft,vmbus.yaml
> 
> -- 
> 1.8.3.1
>