linux-kernel - Re: [PATCH 1/3] mfd: Add support for FTDI FT232H devices

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Message-ID: <20170725115235.GO2729@localhost>
Date:   Tue, 25 Jul 2017 13:52:35 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Anatolij Gustschin <agust@...x.de>
Cc:     Johan Hovold <johan@...nel.org>, Lee Jones <lee.jones@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alan Tull <atull@...nel.org>,
        Moritz Fischer <moritz.fischer@...us.com>,
        linux-gpio@...r.kernel.org, linux-fpga@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        David Laight <David.Laight@...lab.com>
Subject: Re: [PATCH 1/3] mfd: Add support for FTDI FT232H devices

On Wed, Jul 19, 2017 at 02:59:00PM +0200, Anatolij Gustschin wrote:
> On Wed, 19 Jul 2017 10:59:34 +0200
> Johan Hovold johan@...nel.org wrote:

> >> And as David Laight already pointed out, your ftdi-fifo-fpp-mgr driver
> >> seems too application specific for a generic chip like this.  
> >
> >Of which this is one is one of the major.
> 
> Thanks all for feedback. I'm still pondering how to interface the
> fpga manager driver to FTDI FIFO driver.
> 
> >In short, your driver is much to application specific and is probably
> >something that needs to be implemented in userspace using libftdi.
> 
> I have a requirement to use the fpga manager framework, therefore the
> kernel driver is needed. Our usage scenario is a multi stage fpga
> configuration process, the first stage is a pre-configuration via
> FTDI SPI/FIFO, all subsequent stages are also done by other fpga
> manager drivers. libftdi based driver already existed for hardware
> bring-up, now I need similar functionality as kernel fpga manager.

How are you even accessing these fpga-managers from userspace? I thought
current interface was for in-kernel use only?

Thanks,
Johan