linux-kernel - Re: [RFC PATCH v2 0/1] FPGA subsystem core

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Message-ID: <1381250986.6062.3.camel@atx-linux-37>
Date:	Tue, 8 Oct 2013 11:49:46 -0500
From:	Alan Tull <atull@...era.com>
To:	Michal Simek <monstr@...str.eu>
CC:	"H. Peter Anvin" <hpa@...or.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Pavel Machek <pavel@...x.de>,
	Michal Simek <michal.simek@...inx.com>,
	<linux-kernel@...r.kernel.org>, Dinh Nguyen <dinguyen@...era.com>,
	Philip Balister <philip@...ister.org>,
	Alessandro Rubini <rubini@...dd.com>,
	Steffen Trumtrar <s.trumtrar@...gutronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Yves Vandervennet <rocket.yvanderv@...il.com>,
	Kyle Teske <kyle.teske@...com>,
	Josh Cartwright <joshc@....teric.us>,
	Nicolas Pitre <nico@...aro.org>,
	Mark Langsdorf <mark.langsdorf@...xeda.com>,
	Felipe Balbi <balbi@...com>, <linux-doc@...r.kernel.org>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	David Brown <davidb@...eaurora.org>,
	Rob Landley <rob@...dley.net>,
	"David S. Miller" <davem@...emloft.net>,
	Joe Perches <joe@...ches.com>,
	Cesar Eduardo Barros <cesarb@...arb.net>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH v2 0/1] FPGA subsystem core

On Tue, 2013-10-08 at 15:00 +0200, Michal Simek wrote:
> On 10/07/2013 05:07 PM, H. Peter Anvin wrote:
> > Special soft IP presenting a PCI device to the host.
> 
> ok. It means that you should need just different backend for this device
> which is able to communicate over PCI.
> 
> I still can't see why this case should be problematic for this fpga
> manager.
> As Jason pointed if this is just about JTAG emulation and your
> data is in different format then you have to create your backend
> which will support this configuration.
> I will want to look at gpio jtag emulation to be able to program
> different board. We have this support for u-boot and doing in Linux
> should be also possible.
> 
> I think the question is if we can live with 2/3 user interfaces.
> I tend to keep firmware one because it is covering a lot of common
> use cases and it can be easily to use.
> And then I don't have any preference if sysfs or char device

The sysfs and char device interface are equal, except I don't think it
is right to write binary data to a sysfs attribute.

The difference between these 3 options is that firmware will work for
some fixed use cases, but either the sysfs or char interface will work
for all the use cases.

Alan


> is better.
> 
> Thanks,
> Michal
> 


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