linux-kernel - Re: [v2 2/2] fpga: Add support for Lattice iCE40 FPGAs

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Date:   Tue, 25 Oct 2016 09:47:49 -0500
From:   atull <atull@...nsource.altera.com>
To:     Joel Holdsworth <joel@...webreathe.org.uk>
CC:     <ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
        <mark.rutland@....com>, <moritz.fischer@...us.com>,
        <pawel.moll@....com>, <robh+dt@...nel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [v2 2/2] fpga: Add support for Lattice iCE40 FPGAs

On Tue, 25 Oct 2016, Joel Holdsworth wrote:

> 
> > Hi Joel,
> > 
> > Thanks for submitting your driver!
> > 
> > I didn't see any huge problems, just minor things below...
> > 
> > Alan
> > 
> 
> Hi Alan, Thanks for your feedback. I've implemented all your suggestions and
> I'll resubmit.
> 
> I had a question about the status of the fpga-manager framework. Is there
> active work going on? I was wondering if there were any patches for specifying
> a firmware file from device-tree?

Yes!  I have submitted patches for doing exactly that.  About to
submit v21.  Here's patch 1 of v20:

https://patchwork.kernel.org/patch/9379859/

> and/or if there were any patches for loading
> firmware from userspace - something like this: "cat firmware.bin >
> /dev/fpga0"?

We discussed doing a char driver interface.  That's where all this
started.  It met with lots of resistance.

> 
> Only being able to load firmware from kernel C-code is rather a limitation -
> though I suppose the framework is quite early in development.
> 
> Thanks
> Joel
>