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From: Sagar Dharia <sdharia@codeaurora.org>
To: Mark Brown <broonie@kernel.org>, Arnd Bergmann <arnd@arndb.de>
Cc: 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: Fri, 6 May 2016 11:35:09 -0600	[thread overview]
Message-ID: <a2055867-e25e-2892-c3fd-1bec26999942@codeaurora.org> (raw)
In-Reply-To: <20160429111710.GW3217@sirena.org.uk>

[-- Attachment #1: Type: text/plain, Size: 2360 bytes --]

On 4/29/2016 5:17 AM, Mark Brown wrote:
> On Thu, Apr 28, 2016 at 06:49:23PM +0200, Arnd Bergmann wrote:
>> On Thursday 28 April 2016 17:39:20 Mark Brown wrote:
>>> It's not just platforms that use these things though - there's things
>>> like the SolarFlare NICs where the firmware update mechanism essentially
>>> involves exposing a SPI flash as part of a PCI device and we just merged
>>> an ASoC driver for a video card which was reusing some existing IPs and
>>> chips.
>> That's of course fine: you essentially have a discoverable bus there,
>> and if we need something like that, we can always add it later to
>> any subsystem.
> No, the issue with those cases is that there are devices on discoverable
> buses that instantiate non-discoverable buses as part of the
> discoverable device so the implementation of the discoverable device is
> in part essentially a board file.
>
>> In contrast, the interface in the proposed slimbus subsystem seems
>> designed for board files, and is in the best case just dead code
>> that can be removed, or has a risk of being misused e.g. if some
>> device manufacturer decides to use a board file for this instead
>> of describing the slimbus slaves in DT.
> Which can be more of a pain than it should be if the code has been
> written to assume that all the world is DT.  That's the most problematic
> bit of this meme - I've seen people doing things like duplicating IP
> drivers inside larger devices because they don't think they're allowed
> to reuse the IP driver.  We can fix this sort of thing up when we notice
> it but we should also try to avoid people making the mistakes in the
> first place since it saves everyone a lot of effort.  With subsystems
> and to a lesser extent off SoC drivers we need to be careful about just
> blindly removing non-DT code and writing things so they're hard to use
> without DT.
>
> Like I say in this case I think the board file stuff is probably never
> going to get used so it's probably sensible to remove that code but it
> does need to be thought about.
I agree that the board-file stuff isn't going to be used and will remove it.
I will merge patch1 and patch2 and we can later add ACPI 
support/board-file support if needed.

Thanks for the comments
Sagar


-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by The Linux Foundation


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  reply	other threads:[~2016-05-06 17:35 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
     [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 [this message]
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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