linux-kernel - Re: [RFC] dtc: add ability to make nodes conditional on them being referenced

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Message-ID: <20140130134448.682ab850@ipc1.ka-ro>
Date:	Thu, 30 Jan 2014 13:44:48 +0100
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Heiko Stübner <heiko@...ech.de>
Cc:	Grant Likely <grant.likely@...aro.org>, devicetree@...r.kernel.org,
	Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Shawn Guo <shawn.guo@...aro.org>
Subject: Re: [RFC] dtc: add ability to make nodes conditional on them being
 referenced

Hi,

Heiko Stübner wrote:
> From: Heiko Stuebner <heiko.stuebner@...eaders.com>
> 
> On i.MX, which carries a lot of pin-groups of which most are unused on
> individual boards, they noticed that this plehora of nodes also results
> in the runtime-lookup-performance also degrading [0].
> 
> A i.MX-specific solution defining the pingroups in the board files but
> using macros to reference the pingroup-data was not well received
> 
> This patch is trying to solve this issue in a more general way, by
> adding the ability to mark nodes as needing to be referenced somewhere
> in the tree.
> 
> To mark a node a needing to be referenced it must be prefixed with
> /delete-unreferenced/. This makes dtc check the nodes reference-status
> when creating the flattened tree, dropping it if unreferenced.
> 
> For example, the i.MX6SL pingroup
> 
> 	/delete-uneferenced/ pinctrl_ecspi1_1: ecspi1grp-1 {
                 ^^
s/unef/unref/
not really important here, but bad for copy/pasters


Lothar Waßmann
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