linux-kernel - Re: [PATCH V5 1/6] SLIMbus: Device management on SLIMbus

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Message-ID: <20160428143801.GO3217@sirena.org.uk>
Date:	Thu, 28 Apr 2016 15:38:01 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Sagar Dharia <sdharia@...eaurora.org>, gregkh@...uxfoundation.org,
	bp@...e.de, poeschel@...onage.de, treding@...dia.com,
	gong.chen@...ux.intel.com, andreas.noever@...il.com,
	alan@...ux.intel.com, mathieu.poirier@...aro.org, daniel@...ll.ch,
	jkosina@...e.cz, sharon.dvir1@...l.huji.ac.il, joe@...ches.com,
	davem@...emloft.net, james.hogan@...tec.com,
	michael.opdenacker@...e-electrons.com, daniel.thompson@...aro.org,
	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	kheitke@...ience.com, mlocke@...eaurora.org, agross@...eaurora.org,
	sheetal.tigadoli@...il.com, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH V5 1/6] SLIMbus: Device management on SLIMbus

On Thu, Apr 28, 2016 at 02:33:41PM +0200, Arnd Bergmann wrote:
> On Thursday 28 April 2016 12:53:37 Mark Brown wrote:
> > On Thu, Apr 28, 2016 at 12:00:26PM +0200, Arnd Bergmann wrote:

> > > This looks like an artifact of ancient pre-DT times. I'd say kill it off before
> > > someone starts using it.

> > Not every architecture uses DT, and even on architectures with DT
> > support it isn't always the only firmware.  In this specific case it's
> > questionable how many people are going to implement Slimbus at this
> > point but in general insisting that we go DT only doesn't seem great.

> Nothing wrong with adding support for manual board files later if
> we have a good reason for it, but at the moment, this seems completely
> ARM/ARM64 specific.

It's not in theory, but in practice nobody other that Qualcomm is ever
likely to release a controller.

> I don't foresee mobile phones with ACPI using this subsystem, but even
> if we got them, it would be a horrible idea to use hardcoded board
> specific tables in a platform file, and we should insist that whatever
> firmware is present has a way to describe the slimbus devices.

Right, in this particular case I don't think it makes a huge difference
but what you were talking about was "ancient pre-DT times" rather than
something specific to this particular case.  That's definitely a thing
that people keep thinking and it's good to push back on it since we do
have non-DT cases to worry about (some architectures, other firmwares,
things like PCI cards with other components on them and so on).

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