linux-kernel - Re: [PATCH v2 5/6] drivers/hv/vmbus: Get the irq number from DeviceTree

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Date: Fri, 17 May 2024 12:14:58 -0500
From: Rob Herring <robh@...nel.org>
To: Roman Kisel <romank@...ux.microsoft.com>
Cc: arnd@...db.de, bhelgaas@...gle.com, bp@...en8.de, catalin.marinas@....com, 
	dave.hansen@...ux.intel.com, decui@...rosoft.com, haiyangz@...rosoft.com, 
	hpa@...or.com, kw@...ux.com, kys@...rosoft.com, lenb@...nel.org, 
	lpieralisi@...nel.org, mingo@...hat.com, mhklinux@...look.com, 
	rafael@...nel.org, tglx@...utronix.de, wei.liu@...nel.org, will@...nel.org, 
	linux-acpi@...r.kernel.org, linux-arch@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-hyperv@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org, x86@...nel.org, 
	ssengar@...rosoft.com, sunilmut@...rosoft.com, vdso@...bites.dev
Subject: Re: [PATCH v2 5/6] drivers/hv/vmbus: Get the irq number from DeviceTree

On Tue, May 14, 2024 at 5:45 PM Roman Kisel <romank@...ux.microsoftcom> wrote:
>
> The vmbus driver uses ACPI for interrupt assignment on
> arm64 hence it won't function in the VTL mode where only
> DeviceTree can be used.
>
> Update the vmbus driver to discover interrupt configuration
> via DeviceTree.
>
> Signed-off-by: Roman Kisel <romank@...ux.microsoft.com>
> ---
>  drivers/hv/vmbus_drv.c | 37 +++++++++++++++++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
>
> diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
> index e25223cee3ab..52f01bd1c947 100644
> --- a/drivers/hv/vmbus_drv.c
> +++ b/drivers/hv/vmbus_drv.c
> @@ -36,6 +36,7 @@
>  #include <linux/syscore_ops.h>
>  #include <linux/dma-map-ops.h>
>  #include <linux/pci.h>
> +#include <linux/of_irq.h>

If you are using this header in a driver, you are doing it wrong. We
have common functions which work on both ACPI or DT, so use them if
you have a need to support both.

Though my first question on a binding will be the same as on every
'hypervisor binding'.  Why can't you make your hypervisor interfaces
discoverable? It's all s/w, not some h/w device which is fixed.

Rob