From: Lukas Wunner <lukas@wunner.de>
To: Rob Herring <robh@kernel.org>
Cc: Linus Walleij <linus.walleij@linaro.org>,
Mathias Duckeck <m.duckeck@kunbus.de>,
Phil Elwell <phil@raspberrypi.org>,
linux-gpio@vger.kernel.org, devicetree@vger.kernel.org,
Mark Rutland <mark.rutland@arm.com>
Subject: Re: [PATCH 3/4] dt-bindings: gpio: max3191x: Document new driver
Date: Tue, 5 Sep 2017 10:16:24 +0200 [thread overview]
Message-ID: <20170905081624.GA15374@wunner.de> (raw)
In-Reply-To: <20170823004847.jmkb53xtdmmn6vtf@rob-hp-laptop>
Hi Rob,
sorry to bother you again, one more question popped up regarding the
MAX3191x DT bindings:
On Tue, Aug 22, 2017 at 07:48:47PM -0500, Rob Herring wrote:
> On Mon, Aug 21, 2017 at 03:12:00PM +0200, Lukas Wunner wrote:
> > Add device tree bindings for Maxim MAX3191x industrial serializer.
[snip]
> > +Optional properties:
> > + - maxim,nchips: Number of chips in the daisy-chain (default is 1).
Many I/O chips are daisy-chainable, so I've been wondering if a
common property should be introduced?
The existing gpio-74x164.c uses "registers-number" to convey the number
of chips in the daisy chain. (Sans vendor prefix, multiple vendors sell
compatible versions of this chip.)
gpio-pisosr.c takes a different approach and calculates the number of
chips in the daisy-chain by taking the common "ngpios" property
(Documentation/devicetree/bindings/gpio/gpio.txt) and dividing it by 8
(which assumes that each chip has 8 inputs).
Thanks,
Lukas
next prev parent reply other threads:[~2017-09-05 8:16 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-21 13:12 [PATCH 0/4] GPIO driver for Maxim MAX3191x Lukas Wunner
2017-08-21 13:12 ` [PATCH 4/4] gpio: Add driver for Maxim MAX3191x industrial serializer Lukas Wunner
[not found] ` <df530ae703fcfdf52d27a1b6d19b6d1a4724b103.1503319573.git.lukas-JFq808J9C/izQB+pC5nmwQ@public.gmane.org>
2017-08-23 8:09 ` Linus Walleij
2017-08-21 13:12 ` [PATCH 1/4] bitops: Introduce assign_bit() Lukas Wunner
2017-08-21 16:18 ` Bart Van Assche
2017-08-22 8:30 ` Lukas Wunner
2017-08-22 9:27 ` Peter Zijlstra
2017-08-22 10:04 ` Lukas Wunner
2017-08-23 7:32 ` Linus Walleij
2017-08-23 17:09 ` Bart Van Assche
2017-08-24 19:52 ` Linus Walleij
2017-08-21 13:12 ` [PATCH 2/4] gpio: Introduce ->get_multiple callback Lukas Wunner
2017-08-23 7:38 ` Linus Walleij
2017-08-27 17:34 ` Lukas Wunner
2017-08-31 13:48 ` Linus Walleij
2017-08-31 15:46 ` Lukas Wunner
2017-09-03 14:58 ` Linus Walleij
2017-10-04 20:32 ` Lukas Wunner
2017-10-07 11:23 ` Linus Walleij
2017-10-12 11:15 ` Lukas Wunner
2017-08-21 13:12 ` [PATCH 3/4] dt-bindings: gpio: max3191x: Document new driver Lukas Wunner
2017-08-23 0:48 ` Rob Herring
2017-08-23 9:44 ` Lukas Wunner
[not found] ` <20170823094438.GA12416-JFq808J9C/izQB+pC5nmwQ@public.gmane.org>
2017-08-23 13:03 ` Rob Herring
2017-09-05 8:16 ` Lukas Wunner [this message]
2017-10-04 19:31 ` Lukas Wunner
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