linux-kernel - Re: [PATCH v8 2/4] fpga manager: add sysfs interface document

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Message-ID: <20150110151118.GA16036@amd>
Date:	Sat, 10 Jan 2015 16:11:18 +0100
From:	Pavel Machek <pavel@...x.de>
To:	Pantelis Antoniou <pantelis.antoniou@...sulko.com>
Cc:	atull <atull@...nsource.altera.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	jgunthorpe@...idianresearch.com, hpa@...or.com,
	Michal Simek <monstr@...str.eu>,
	Michal Simek <michal.simek@...inx.com>, rdunlap@...radead.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	devicetree@...r.kernel.org, robh+dt@...nel.org,
	Grant Likely <grant.likely@...aro.org>, iws@...o.caltech.edu,
	linux-doc@...r.kernel.org, Mark Brown <broonie@...nel.org>,
	philip@...ister.org, rubini@...dd.com,
	Steffen Trumtrar <s.trumtrar@...gutronix.de>,
	jason@...edaemon.net, kyle.teske@...com, nico@...aro.org,
	Felipe Balbi <balbi@...com>, m.chehab@...sung.com,
	davidb@...eaurora.org, Rob Landley <rob@...dley.net>,
	davem@...emloft.net, cesarb@...arb.net, sameo@...ux.intel.com,
	akpm@...ux-foundation.org,
	Linus Walleij <linus.walleij@...aro.org>, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	galak@...eaurora.org, devel@...verdev.osuosl.org,
	Alan Tull <delicious.quinoa@...il.com>,
	dinguyen@...nsource.altera.com, yvanderv@...nsource.altera.com
Subject: Re: [PATCH v8 2/4] fpga manager: add sysfs interface document

On Sat 2015-01-10 10:10:51, Pantelis Antoniou wrote:
> Hi Pavel,
> 
> > On Jan 9, 2015, at 22:56 , Pavel Machek <pavel@...x.de> wrote:
> > 
> > On Fri 2015-01-09 13:14:24, atull wrote:
> >> On Wed, 7 Jan 2015, Pavel Machek wrote:
> >> 
> >>> On Tue 2015-01-06 14:13:37, atull@...nsource.altera.com wrote:
> >>>> +
> >>>> +What:		/sys/class/fpga_manager/<fpga>/firmware
> >>>> +Date:		October 2014
> >>>> +KernelVersion:	3.18
> >>>> +Contact:	Alan Tull <atull@...nsource.altera.com>
> >>>> +Description:	Name of the FPGA image file to load using firmware
> >>>> class.
> >>> 
> >>> This one is ugly: it unneccessarily passes firmware name through the
> >>> kernel. Just make interface and code simpler by always passing
> >>> "socfpga-fpga-image" or something like that.
> >>> 
> >>> Thanks,
> >>> 									Pavel
> >> 
> >> Hi Pavel,
> >> 
> >> It might be ugly.  It's not unnecessary.  Some uses of FPGAs involve
> >> switching out the FPGA images dynamically under control of the userspace.
> > 
> > Then configure udev to load right firmware for you, or ln -s
> > image-i-want-now socfpga-fpga-image to select the one to read…?
> > 
> 
> Who said that udev is going to be available in the kind of system this is going to end in?

Noone.

> Doing ln -s tricks to load a different image? Really?

But if you don't have udev, you can do ln -s. It is better than
open-coding symlink functionality into
/sys/class/fpga_manager/<fpga>/firmware ... cause that's what this is.

Actually, clean implementation of "firmware" would be symlink in
sysfs; but I'd say that would be overdoing it.

> I say the interface is fine as it is.

I say it is not.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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