linux-kernel - Re: [PATCH v2 1/6] arm64/hyperv: Support DeviceTree

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Date: Wed, 15 May 2024 09:45:49 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Roman Kisel <romank@...ux.microsoft.com>, 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, robh@...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
Cc: ssengar@...rosoft.com, sunilmut@...rosoft.com, vdso@...bites.dev
Subject: Re: [PATCH v2 1/6] arm64/hyperv: Support DeviceTree

On 15/05/2024 00:43, Roman Kisel wrote:
> The Virtual Trust Level platforms rely on DeviceTree, and the
> arm64/hyperv code supports ACPI only. Update the logic to
> support DeviceTree on boot as well as ACPI.
> 
> Signed-off-by: Roman Kisel <romank@...ux.microsoft.com>
> ---
>  arch/arm64/hyperv/mshyperv.c | 34 +++++++++++++++++++++++++++++-----
>  1 file changed, 29 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/arm64/hyperv/mshyperv.c b/arch/arm64/hyperv/mshyperv.c
> index b1a4de4eee29..208a3bcb9686 100644
> --- a/arch/arm64/hyperv/mshyperv.c
> +++ b/arch/arm64/hyperv/mshyperv.c
> @@ -15,6 +15,9 @@
>  #include <linux/errno.h>
>  #include <linux/version.h>
>  #include <linux/cpuhotplug.h>
> +#include <linux/libfdt.h>
> +#include <linux/of.h>
> +#include <linux/of_fdt.h>
>  #include <asm/mshyperv.h>
>  
>  static bool hyperv_initialized;
> @@ -27,6 +30,29 @@ int hv_get_hypervisor_version(union hv_hypervisor_version_info *info)
>  	return 0;
>  }
>  
> +static bool hyperv_detect_fdt(void)
> +{
> +#ifdef CONFIG_OF
> +	const unsigned long hyp_node = of_get_flat_dt_subnode_by_name(
> +			of_get_flat_dt_root(), "hypervisor");

Why do you add an ABI for node name? Although name looks OK, but is it
really described in the spec that you depend on it? I really do not like
name dependencies...

Where is the binding for this?

Best regards,
Krzysztof