linux-kernel - Re: [RFC PATCH] fpga: Introduce new fpga subsystem

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Message-ID: <52403BD0.5080807@monstr.eu>
Date:	Mon, 23 Sep 2013 15:02:08 +0200
From:	Michal Simek <monstr@...str.eu>
To:	Yves Vandervennet <rocket.yvanderv@...il.com>
CC:	Alan Tull <atull@...era.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Jason Cooper <jason@...edaemon.net>,
	Michal Simek <michal.simek@...inx.com>,
	linux-kernel@...r.kernel.org, Pavel Machek <pavel@....cz>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Dinh Nguyen <dinguyen@...era.com>,
	Philip Balister <philip@...ister.org>,
	Alessandro Rubini <rubini@...dd.com>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Cesar Eduardo Barros <cesarb@...arb.net>,
	Joe Perches <joe@...ches.com>,
	"David S. Miller" <davem@...emloft.net>,
	Stephen Warren <swarren@...dia.com>,
	Arnd Bergmann <arnd@...db.de>,
	David Brown <davidb@...eaurora.org>,
	Dom Cobley <popcornmix@...il.com>
Subject: Re: [RFC PATCH] fpga: Introduce new fpga subsystem

On 09/19/2013 05:18 PM, Yves Vandervennet wrote:
> On Thu, Sep 19, 2013 at 5:55 AM, Michal Simek <monstr@...str.eu> wrote:
> 
>>> Is there some way a per-device userspace helper can be added that can
>>> handle adding the headers?  Such that different fpga types get different
>>> helpers?
>>
>> What do you exactly mean by that? Any example what do you want to achieve?
> Bit streams may not be in raw format, so using 'cat' is not possible.
> Xilinx and Altera have their own bit stream "richer" format, that need
> to be processed before they are presented to the driver(s). So, a
> hotplug helper per manufacturer/FPGA is required. Assuming 'cat' will
> be used is too limiting.
> Does it make sense to you?

Definitely this make sense to me but the point is if this should be
the part of this patch or just separate altera.c/xilinx.c file which
is able to detect and check this format.
I am not saying that it can't be there but currently without
any code I can't see any reason why there should be hook for code
which doesn't exist.

M



-- 
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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