linux-kernel - Re: [RFC PATCH 3/3] ARM: at91/dt: move sama5 to generic pinconf

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Date:	Wed, 28 Aug 2013 14:28:02 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Boris BREZILLON <b.brezillon@...rkiz.com>
Cc:	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ian.campbell@...rix.com>,
	Rob Landley <rob@...dley.net>,
	Russell King <linux@....linux.org.uk>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Masanari Iida <standby24x7@...il.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Richard Genoud <richard.genoud@...il.com>,
	Heiko Stuebner <heiko@...ech.de>,
	James Hogan <james.hogan@...tec.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH 3/3] ARM: at91/dt: move sama5 to generic pinconf

On Sat, Aug 24, 2013 at 11:40 PM, Boris BREZILLON
<b.brezillon@...rkiz.com> wrote:

> Add generic pinconf definitions and reference appropriate configs in
> atmel,pins properties.
>
> Signed-off-by: Boris BREZILLON <b.brezillon@...rkiz.com>
(...)
>                         pinctrl@...ff200 {
>                                 #address-cells = <1>;
>                                 #size-cells = <1>;
> -                               compatible = "atmel,at91sam9x5-pinctrl", "atmel,at91rm9200-pinctrl", "simple-bus";
> +                               compatible = "atmel,at91sam9x5-pinctrl", "atmel,at91rm9200-pinctrl", "generic-pinconf", "simple-bus";

What kind of compatible string is that "generic-pinconf"?

There is no driver that can instantiate against this string but I'm not
100% sure about such things. Is there some other driver doing this?

Else I think it'd just be removed.

> +                               pcfg_none: pcfg_none {
> +                                       bias-disable;
> +                               };
> +
> +                               pcfg_pull_up: pcfg_pull_up {
> +                                       bias-pull-up;
> +                               };

Nice.

> +                               pcfg_deglitch: pcfg_deglitch {
> +                                       input-deglitch = <1>;
> +                               };
> +
> +                               pcfg_pull_up_deglitch: pcfg_pull_up_deglitch {
> +                                       bias-pull-up;
> +                                       input-deglitch = <1>;
> +                               };

input-deglitch seems like a proposed generic binding but I haven't seen
these yet?

(It might be in my violently exploding INBOX though sorry in that case.)

This would need adding to
Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
Plus changes to pinctrl core for handling.

BTW: this is really moving in the right direction!

Yours,
Linus Walleij
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