linux-kernel - Re: [PATCH 3/4] ARM: pinctrl: Add Broadcom Capri pinctrl driver

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Date:	Wed, 6 Nov 2013 10:29:47 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	Heiko Stübner <heiko@...ech.de>,
	Sherman Yin <syin@...adcom.com>,
	Laxman Dewangan <ldewangan@...dia.com>,
	Mark Rutland <mark.rutland@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Christian Daudt <bcm@...thebug.org>,
	Russell King <linux@....linux.org.uk>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
	Rob Landley <rob@...dley.net>,
	Grant Likely <grant.likely@...aro.org>,
	Matt Porter <matt.porter@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 3/4] ARM: pinctrl: Add Broadcom Capri pinctrl driver

On Tue, Nov 5, 2013 at 1:04 AM, Stephen Warren <swarren@...dotorg.org> wrote:
> On 11/04/2013 04:26 PM, Heiko Stübner wrote:

> Pure Boolean values should be represented as a valueless property. If
> the property is present, the value is true, otherwise false.
>
> However, pinctrl bindings often don't represent Boolean values, but
> rather tri-states, with the following values:
>
> * Don't touch this configuration option at all (missing)
> * Enable the option (<1>)
> * Disable the option (<0>)

But in this case we actually have these booleans to specify
exactly what we want to do:

bias-disable            - disable any pin bias
bias-high-impedance     - high impedance mode ("third-state", "floating")
bias-bus-hold           - latch weakly
bias-pull-up            - pull up the pin
bias-pull-down          - pull down the pin
bias-pull-pin-default   - use pin-default pull state

Yours,
Linus Walleij
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