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

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Date:   Wed, 12 Jul 2017 11:11:46 +0200
From:   Bjørn Mork <bjorn@...k.no>
To:     Johan Hovold <johan@...nel.org>
Cc:     Anatolij Gustschin <agust@...x.de>,
        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
Subject: Re: [PATCH 1/3] mfd: Add support for FTDI FT232H devices

Johan Hovold <johan@...nel.org> writes:
> On Tue, Jul 11, 2017 at 08:52:37AM +0200, Anatolij Gustschin wrote:
>
>> For devices with connected EEPROM some modes (including UART) are
>> configurable in the EEPROM. For devices without EEPROM the default
>> mode is always UART, but FIFO-, Bitbang- and MPSSE-mode can be
>> switched via commands to the the chip.
>
> IIRC we should be able read from the EEPROM, and I would at least expect
> there to be a way to retrieve the current mode as well.

Stupid question, I know, but I cannot help thinking: If you have an
EEPROM then why the h... don't you use an application specific device
ID?


Bjørn