linux-kernel - Re: [RFC PATCH v1 11/38] KVM: arm64: CCA: register host tsm platform device

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Message-ID: <yq5aqzxy9ij1.fsf@kernel.org>
Date: Wed, 30 Jul 2025 14:12:26 +0530
From: Aneesh Kumar K.V <aneesh.kumar@...nel.org>
To: Jason Gunthorpe <jgg@...pe.ca>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Dan Williams <dan.j.williams@...el.com>
Cc: linux-coco@...ts.linux.dev, kvmarm@...ts.linux.dev,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org, aik@....com,
	lukas@...ner.de, Samuel Ortiz <sameo@...osinc.com>,
	Xu Yilun <yilun.xu@...ux.intel.com>,
	Suzuki K Poulose <Suzuki.Poulose@....com>,
	Steven Price <steven.price@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>
Subject: Re: [RFC PATCH v1 11/38] KVM: arm64: CCA: register host tsm
 platform device

Jason Gunthorpe <jgg@...pe.ca> writes:

> On Tue, Jul 29, 2025 at 06:10:45PM +0100, Jonathan Cameron wrote:
>
>> > +static struct platform_device cca_host_dev = {
>> Hmm. Greg is getting increasingly (and correctly in my view) grumpy with
>> platform devices being registered with no underlying resources etc as glue
>> layers.  Maybe some of that will come later.
>
> Is faux_device a better choice? I admit to not knowing entirely what
> it is for..
>
> But alternatively, why do we need a dummy "hw" struct device at all?
> Typically a subsystem like TSM should be structured to create its own
> struct devices..
>
> I would expect this to just call 'register tsm' ?
>

The goal is to have tsm class device to be parented by the platform
device.

# ls -al
total 0
drwxr-xr-x    2 root     root             0 Jan 13 06:07 .
drwxr-xr-x   23 root     root             0 Jan  1 00:00 ..
lrwxrwxrwx    1 root     root             0 Jan 13 06:07 tsm0 -> ../../devices/platform/arm-rmi-dev/tsm/tsm0
# pwd
/sys/class/tsm

-aneesh