linux-kernel - Re: [PATCH 0/3] of: add update device node status via cmdline feature

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Message-ID: <CACxGe6tdvdFsAHjEZK8fuHNEgV+JW8K2GfLN0gD3HfSopb4Kfw@mail.gmail.com>
Date:	Thu, 15 Aug 2013 13:46:12 +0100
From:	Grant Likely <grant.likely@...aro.org>
To:	Rob Herring <robherring2@...il.com>
Cc:	Dong Aisheng <b29396@...escale.com>,
	devicetree-discuss <devicetree-discuss@...ts.ozlabs.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Rob Landley <rob@...dley.net>,
	Rob Herring <rob.herring@...xeda.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 0/3] of: add update device node status via cmdline feature

On Thu, Aug 15, 2013 at 1:37 PM, Rob Herring <robherring2@...il.com> wrote:
> On 08/15/2013 05:55 AM, Dong Aisheng wrote:
>> We meet some boards having a lot of pin conflicts between different devices,
>> only one of them can be enabled to run at one time.
>>
>> e.g. imx6q sabreauto board, i2c, spi, weim, flexcan, uart and etc involved
>> with pin conflict.
>>
>> Instead of changing dts manually or adding a lot dts files according to
>> different device availability, we provide feature to dynamically update the
>> device node status via command line, then those devices involved with
>> pin conflict can be enabled or disabled dynamically.
>>
>> It's conveniently to use and can save a lot dts board files, also can
>> permenantly fix the pin conflicts issue.
>
> This doesn't scale either with updating of lots devices or when the next
> person comes along and wants to edit another property.
>
> This is something u-boot is perfectly capable of handling and updating
> status is something lots of boards already do.

+1

g.
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