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

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Message-ID: <52540208.3090406@monstr.eu>
Date:	Tue, 08 Oct 2013 15:00:56 +0200
From:	Michal Simek <monstr@...str.eu>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	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, Alan Tull <atull@...era.com>,
	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 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
is better.

Thanks,
Michal

-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform

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