Date: Wed, 14 Dec 2016 11:06:35 +0000
From: Russell King - ARM Linux <linux@armlinux.org.uk>
To: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arm-kernel@lists.infradead.org,
        Jaghathiswari Rankappagounder Natarajan <jaghu@google.com>,
        openbmc@lists.ozlabs.org, robh+dt@kernel.org, mark.rutland@arm.com,
        gregkh@linuxfoundation.org, joel@jms.id.au,
        linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
        "linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>,
        linus.walleij@linaro.org
Subject: Re: [PATCH linux v1 4/4] arm: dts: Add dt-binding to support seven
 segment display on zaius
Message-ID: <20161214110635.GB14217@n2100.armlinux.org.uk>
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On Wed, Dec 14, 2016 at 10:00:46AM +0100, Arnd Bergmann wrote:
> On Wednesday, December 14, 2016 9:55:47 AM CET Arnd Bergmann wrote:
> > According to your introductory mail, the interface is assumed to be
> > a 74HC164. Should we use that ID in the compatible string?
> > 
> > We can always add other strings later if we want to support multiple
> > wire formats.
> 
> Actually, looking up 74hc164, that seems to be a gpio expander,
> so maybe a more flexible way to do the same is to put a driver
> for the expander into drivers/gpio/ and have the main driver
> access the outputs of that using the gpiolib interface.

There already is - drivers/gpio/gpio-74x164.c

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