linux-kernel - Re: [PATCH 2/3] fpga bus driver

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Date:	Tue, 5 Aug 2014 21:21:46 +0300
From:	Pantelis Antoniou <pantelis.antoniou@...sulko.com>
To:	<atull@...nsource.altera.com>
Cc:	<gregkh@...uxfoundation.org>, <jgunthorpe@...idianresearch.com>,
	<hpa@...or.com>, <monstr@...str.eu>, <michal.simek@...inx.com>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<robh+dt@...nel.org>, <grant.likely@...aro.org>, <pavel@...x.de>,
	<broonie@...nel.org>, <philip@...ister.org>, <rubini@...dd.com>,
	<s.trumtrar@...gutronix.de>, <jason@...edaemon.net>,
	<kyle.teske@...com>, <nico@...aro.org>, <balbi@...com>,
	<m.chehab@...sung.com>, <davidb@...eaurora.org>, <rob@...dley.net>,
	<davem@...emloft.net>, <cesarb@...arb.net>,
	<sameo@...ux.intel.com>, <akpm@...ux-foundation.org>,
	<linus.walleij@...aro.org>, <delicious.quinoa@...il.com>,
	<dinguyen@...nsource.altera.com>, <yvanderv@...nsource.altera.com>
Subject: Re: [PATCH 2/3] fpga bus driver

Hi Alan,

On Aug 2, 2014, at 1:28 AM, <atull@...nsource.altera.com> wrote:

> From: Alan Tull <atull@...nsource.altera.com>
> 
> This driver allows programming the fpga from
> device tree overlays.
> 
> This code is dependent on Pantelis Antoniou's current
> work on Device Tree overlays, a method of dynamically
> altering the kerel's live Device Tree.  This patchset
> was tested with Pantelis's and Grant Likely's stuff
> that is in git plus some dtc fixups for compiling
> overlays.
> 
> Resume is handled by re-requesting the firmware and
> reprogramming the FPGA.
> 
> Here's a simple example. Start with:
>  * the altera-gpio driver built in to the kernel but not in the
>    device tree.
>  * raw fpga image at /lib/firmware/soc_system.rbf
>  * Load appropriate device tree overlay in configfs by doing
>    $ mkdir /config/device-tree/overlays/1
>    $ echo socfpga_overlay.dtbo > /config/device-tree/overlays/1/path

FWIW, there's now an updated configfs interface. You can just 
# cp socfpga_overlay.dtbo /config/device-tree/overlays/1/dtbo

That's namespace safe, if you care about those things.

Regards

-- Pantelis

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