linux-kernel - Re: [PATCH V5] gpio: New driver for LSI ZEVIO SoCs

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Date:	Thu, 29 Aug 2013 14:29:32 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Fabian Vogt <vogtinator@...pera.com>
CC:	Linus Walleij <linus.walleij@...aro.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <rob.herring@...xeda.com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ian.campbell@...rix.com>
Subject: Re: [PATCH V5] gpio: New driver for LSI ZEVIO SoCs

On 08/29/2013 02:28 PM, Fabian Vogt wrote:
>> On 08/26/2013 12:18 PM, Fabian Vogt wrote:
>>> This driver supports the GPIO controller found in LSI ZEVIO SoCs.
>>> It has been successfully tested on a TI nspire CX calculator.

>>> diff --git a/Documentation/devicetree/bindings/gpio/gpio-zevio.txt
>>> b/Documentation/devicetree/bindings/gpio/gpio-zevio.txt

>>> +- #gpio-cells = <2>
>> This should describe what those cells are. For example perhaps:
>>
>> #gpio-cells. Must be 2. The first cell is the GPIO number. The second
>>  cell is used to specify optional parameters:
>>  - bit 0 specifies polarity (0 for normal, 1 for inverted)
>
> "Must be 2. The second cell is ... optional"?

I'm not sure what your question is, but perhaps this will answer it:

The 2nd cell isn't optional, but setting the various flags within the
cell is optional.
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