From: "Lothar Waßmann" <LW@KARO-electronics.de>
To: "Heiko Stübner" <heiko@sntech.de>
Cc: Grant Likely <grant.likely@linaro.org>,
devicetree@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Shawn Guo <shawn.guo@linaro.org>
Subject: Re: [RFC] dtc: add ability to make nodes conditional on them being referenced
Date: Thu, 30 Jan 2014 13:44:48 +0100 [thread overview]
Message-ID: <20140130134448.682ab850@ipc1.ka-ro> (raw)
In-Reply-To: <1578575.rVWgTPdq1W@phil>
Hi,
Heiko Stübner wrote:
> From: Heiko Stuebner <heiko.stuebner@bqreaders.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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next prev parent reply other threads:[~2014-01-30 12:45 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-30 12:25 Heiko Stübner
2014-01-30 12:44 ` Lothar Waßmann [this message]
2014-02-03 19:22 ` Maxime Ripard
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