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From:   Linus Walleij <linus.walleij@linaro.org>
Date:   Wed, 11 Aug 2021 16:45:04 +0200
Message-ID: <CACRpkdZ5owo0rfOqysLpu+La+0p5SgNkjW6OFbG9tsOmtNJEtA@mail.gmail.com>
Subject: Re: [PATCH V2 3/3] gpio: modepin: Add driver support for modepin GPIO controller
To:     Michal Simek <michal.simek@xilinx.com>
Cc:     Piyush Mehta <piyush.mehta@xilinx.com>,
        Arnd Bergmann <arnd@arndb.de>, Zou Wei <zou_wei@huawei.com>,
        Greg KH <gregkh@linuxfoundation.org>, wendy.liang@xilinx.com,
        Nobuhiro Iwamatsu <iwamatsu@nigauri.org>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        Rob Herring <robh+dt@kernel.org>, rajan.vaja@xilinx.com,
        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>, git <git@xilinx.com>,
        Srinivas Goud <sgoud@xilinx.com>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        linux-kernel <linux-kernel@vger.kernel.org>
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On Wed, Aug 11, 2021 at 3:30 PM Michal Simek <michal.simek@xilinx.com> wrote:

> They are bootmode pins because that pins are designed and used by ROM to
> get information which boot device should be used.
> But after this is it is really behaving as generic purpose I/O pins.
> Xilinx is using them for years for usb phy resets. I have also seen them
> to be used for other reset functionality.

OK if they are used for general purpose tasks then a GPIO driver
is fine, I was worried that it was just a way to read these pins from
userspace.

Go ahead with this patch series!

Yours,
Linus Walleij