linux-kernel - Re: [PATCH v3 6/9] ARM: mvebu: add pinctrl device in DT for Armada 370/XP SoCs

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Date:	Tue, 11 Sep 2012 16:23:19 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
CC:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	Russell King <linux@....linux.org.uk>,
	Lior Amsalem <alior@...vell.com>, Andrew Lunn <andrew@...n.ch>,
	Jason Cooper <jason@...edaemon.net>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Ben Dooks <ben.dooks@...ethink.co.uk>,
	Linus Walleij <linus.walleij@...aro.org>,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 6/9] ARM: mvebu: add pinctrl device in DT for Armada
 370/XP SoCs

On 09/10/2012 02:39 AM, Sebastian Hesselbarth wrote:
> From: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
> 
> The Armada 370 and XP SoCs have configurable muxing for a certain
> number of their pins, controlled through a pinctrl driver.

Hmmm. I'd be tempted just to put the entire node definition there;
putting in a .dtsi file just to share the reg property doesn't seem
especially useful.

> The 'compatible' property is defined in the SoC-specific .dtsi files,
> since the compatible string identifies the number of pins and other
> SoC-specific properties.

> diff --git a/arch/arm/boot/dts/armada-370-xp.dtsi b/arch/arm/boot/dts/armada-370-xp.dtsi

> +		pinctrl@...18000 {

If this is the only pinctrl instance, you'd typically name the node just
"pinctrl", since the "@d0018000" isn't needed to get unique node names.

> +			reg = <0xd0018000 0x38>;
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +			ranges;

What is "ranges" for; this isn't a memory-mapped bus, right?

> +		};
>  	};
>  };

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