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Date: Thu, 14 May 2026 16:23:37 +0200
From: Greg KH <gregkh@linuxfoundation.org>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>,
	"Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>,
	linux-coco@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, Jeremy Linton <jeremy.linton@arm.com>,
	Jonathan Cameron <jic23@kernel.org>,
	Lorenzo Pieralisi <lpieralisi@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Sudeep Holla <sudeep.holla@arm.com>, Will Deacon <will@kernel.org>,
	Steven Price <steven.price@arm.com>
Subject: Re: [PATCH v5 1/3] firmware: smccc: coco: Manage arm-smccc platform
 device and CCA auxiliary drivers
Message-ID: <2026051431-untainted-gallon-4317@gregkh>
References: <20260514094030.42495-1-aneesh.kumar@kernel.org>
 <20260514094030.42495-2-aneesh.kumar@kernel.org>
 <0c88bcee-65b5-4328-87e6-e1c714c3d1ca@arm.com>
 <2026051420-amusement-drove-73e6@gregkh>
 <agXL12bNh4gGyK1K@arm.com>
 <2026051445-magician-coffee-962f@gregkh>
 <agXSI6PPf4uR7VBL@arm.com>
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In-Reply-To: <agXSI6PPf4uR7VBL@arm.com>

On Thu, May 14, 2026 at 02:46:11PM +0100, Catalin Marinas wrote:
> On Thu, May 14, 2026 at 03:25:34PM +0200, Greg Kroah-Hartman wrote:
> > On Thu, May 14, 2026 at 02:19:19PM +0100, Catalin Marinas wrote:
> > > On Thu, May 14, 2026 at 02:55:48PM +0200, Greg Kroah-Hartman wrote:
> > > > On Thu, May 14, 2026 at 12:04:13PM +0100, Suzuki K Poulose wrote:
> > > > > On 14/05/2026 10:40, Aneesh Kumar K.V (Arm) wrote:
> > > > > > Make the SMCCC driver responsible for registering the arm-smccc platform
> > > > > > device and after confirming the relevant SMCCC function IDs, create
> > > > > > the arm_cca_guest auxiliary device.
> > > > > > 
> > > > > 
> > > > > There are a few changes squashed in to this patch. Please could we
> > > > > split the patch in the following order ?
> > > > > 
> > > > > 1. Add platform device for arm-smccc
> > > > 
> > > > Do not make any more "fake" platform devices please.
> > > > 
> > > > > 2. Move TRNG to Auxilliary Device - (Even though it is a later patch, move
> > > > > it before the RSI changes)
> > > > 
> > > > No, move it to the faux api please.
> > > 
> > > So should we end up with:
> > > 
> > >   /sys/devices/faux/arm-smccc/
> > >     smccc_trng/
> > >     arm-rsi-dev/
> > 
> > What types are these child devices?  Also faux ones?
> 
> They'd also be faux devices with this structure (in practice they are
> firmware interfaces that may be backed by some hardware like in the TRNG
> case, though not directly accessible to Linux).

Great, seems sane to me!