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Date: Tue, 26 May 2026 10:41:29 +0100
From: Sudeep Holla <sudeep.holla@kernel.org>
To: Nathan Chancellor <nathan@kernel.org>
Cc: linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-integrity@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
	Yeoreum Yun <yeoreum.yun@arm.com>
Subject: Re: [PATCH 2/4] firmware: arm_ffa: Register core as a platform driver
Message-ID: <20260526-ancient-bulky-numbat-915f10@sudeepholla>
References: <20260508-b4-ffa_plat_dev-v1-0-c5a30f8cf7b8@kernel.org>
 <20260508-b4-ffa_plat_dev-v1-2-c5a30f8cf7b8@kernel.org>
 <20260523001148.GA1319283@ax162>
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In-Reply-To: <20260523001148.GA1319283@ax162>

On Fri, May 22, 2026 at 05:11:48PM -0700, Nathan Chancellor wrote:
> Hi Sudeep,
> 
> On Fri, May 08, 2026 at 06:54:16PM +0100, Sudeep Holla wrote:
> > Move the FF-A core bring-up and teardown paths into platform driver
> > probe and remove callbacks, and register a synthetic arm-ffa platform
> > device to bind the driver.
> > 
> > This makes the FF-A core lifetime follow the driver model while keeping
> > the device creation internal to the FF-A core. Use normal platform driver
> > registration so the probe path has standard driver-core semantics.
> > 
> > The synthetic platform device is a temporary bridge until ACPI and
> > devicetree describe the FF-A core device or object. Once those firmware
> > description paths are defined, the internal platform device creation can
> > be dropped and the driver can bind to the firmware-described device
> > directly.
> > 
> > Since the transport selection now happens from the platform probe path,
> > drop the __init annotation from ffa_transport_init().
> > 
> > Signed-off-by: Sudeep Holla <sudeep.holla@kernel.org>
> 
> I am seeing
> 
>   arm-ffa arm-ffa: probe with driver arm-ffa failed with error -95
> 
> on my two arm64 test machines after this change landed in -next as
> commit e659fc8e537c ("firmware: arm_ffa: Register core as a platform
> driver"), is this expected? If so, perhaps it should be silenced?
> 

Yes it should be silenced, I will see how it can be done. Thanks for the
report.

-- 
Regards,
Sudeep