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From: Mark Brown <broonie@kernel.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Sagar Dharia <sdharia@codeaurora.org>,
	gregkh@linuxfoundation.org, bp@suse.de, poeschel@lemonage.de,
	treding@nvidia.com, gong.chen@linux.intel.com,
	andreas.noever@gmail.com, alan@linux.intel.com,
	mathieu.poirier@linaro.org, daniel@ffwll.ch, jkosina@suse.cz,
	sharon.dvir1@mail.huji.ac.il, joe@perches.com,
	davem@davemloft.net, james.hogan@imgtec.com,
	michael.opdenacker@free-electrons.com,
	daniel.thompson@linaro.org, robh+dt@kernel.org,
	pawel.moll@arm.com, mark.rutland@arm.com,
	ijc+devicetree@hellion.org.uk, galak@codeaurora.org,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	kheitke@audience.com, mlocke@codeaurora.org,
	agross@codeaurora.org, sheetal.tigadoli@gmail.com,
	linux-arm-msm@vger.kernel.org
Subject: Re: [PATCH V5 1/6] SLIMbus: Device management on SLIMbus
Date: Thu, 28 Apr 2016 15:38:01 +0100	[thread overview]
Message-ID: <20160428143801.GO3217@sirena.org.uk> (raw)
In-Reply-To: <7478716.z4vdp0mVTA@wuerfel>

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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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  reply	other threads:[~2016-04-28 14:38 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-27 23:58 [PATCH V5 0/6] Introduce framework for SLIMbus device drivers Sagar Dharia
2016-04-27 23:58 ` [PATCH V5 1/6] SLIMbus: Device management on SLIMbus Sagar Dharia
2016-04-28 10:00   ` Arnd Bergmann
2016-04-28 11:53     ` Mark Brown
2016-04-28 12:33       ` Arnd Bergmann
2016-04-28 14:38         ` Mark Brown [this message]
     [not found]           ` <20160428143801.GO3217-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2016-04-28 14:59             ` Arnd Bergmann
2016-04-28 14:59               ` Arnd Bergmann
2016-04-28 16:39               ` Mark Brown
2016-04-28 16:49                 ` Arnd Bergmann
2016-04-29 11:17                   ` Mark Brown
2016-04-29 11:17                     ` Mark Brown
2016-05-06 17:35                     ` Sagar Dharia
2016-06-03  9:14   ` Masami Hiramatsu
2016-04-27 23:58 ` [PATCH V5 2/6] of/slimbus: OF helper for SLIMbus Sagar Dharia
2016-04-28  9:54   ` Arnd Bergmann
2016-04-28 11:11   ` Mark Rutland
2016-05-03 16:11   ` Rob Herring
2016-05-03 19:26     ` Arnd Bergmann
2016-04-27 23:58 ` [PATCH V5 3/6] slimbus: Add messaging APIs to slimbus framework Sagar Dharia
2016-04-28  9:52   ` Arnd Bergmann
2016-04-27 23:58 ` [PATCH V5 4/6] slim: qcom: Add Qualcomm Slimbus controller driver Sagar Dharia
     [not found]   ` <1461801489-16254-5-git-send-email-sdharia-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2016-04-28 11:28     ` Mark Rutland
2016-04-28 11:28       ` Mark Rutland
2016-05-06 17:28       ` Sagar Dharia
2016-04-27 23:58 ` [PATCH V5 5/6] slimbus: Add support for 'clock-pause' feature Sagar Dharia
2016-04-27 23:58 ` [PATCH V5 6/6] slim: qcom: Add runtime-pm support using clock-pause feature Sagar Dharia
2016-06-03  9:14 ` [PATCH V5 0/6] Introduce framework for SLIMbus device drivers Masami Hiramatsu
2016-06-27  1:30   ` Masami Hiramatsu

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