linux-kernel - Re: [PATCH v14 0/7] fpga area and fpga bridge framework

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Message-ID: <CAAtXAHcNqP4ftOUbFYK=0kmpY9XmPgQ1=xAejQUj90N4x4pFng@mail.gmail.com>
Date:	Mon, 14 Dec 2015 09:16:33 -0800
From:	Moritz Fischer <moritz.fischer@...us.com>
To:	Alan Tull <atull@...nsource.altera.com>
Cc:	Rob Herring <robh+dt@...nel.org>, Josh Cartwright <joshc@...com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Michal Simek <monstr@...str.eu>,
	Michal Simek <michal.simek@...inx.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Jonathan Corbet <corbet@....net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Devicetree List <devicetree@...r.kernel.org>,
	linux-doc@...r.kernel.org,
	Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
	Alan Tull <delicious.quinoa@...il.com>,
	"dinguyen@...nsource.altera.com" <dinguyen@...nsource.altera.com>
Subject: Re: [PATCH v14 0/7] fpga area and fpga bridge framework

Hi Alan,

On Thu, Dec 10, 2015 at 3:37 PM,  <atull@...nsource.altera.com> wrote:
> From: Alan Tull <atull@...nsource.altera.com>
>
> For v14 I'm dropping the concept of "simple-fpga-bus" for "fpga-area"
> with reworked bindings.

I had an offline discussion with Josh Cartwright about his concerns.
He brought up a good
point on w.r.t to the way FPGA Area (Bus) deals with things.

Currently we only support complete status = "okay" vs "disabled" kind
of overlays.

If now you have say a UART in the FPGA that you don't want to go away
and come back on reload,
we don't have a good way of expressing this. Is there a good way to
express non-mmio FPGA devices?

I've been toying around with hacking up struct device to include a
FPGA 'domain', and then, similar
to power domains allow devices to register suspend() / resume() style
callbacks (could call them pre_reload() or something like that ...)

I haven't gotten around to think it through. At this point it's just
an idea and I don't have real code to show.

I realize the issue with that is we'd have to make changes to struct device.

Cheers,

Moritz
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