linux-kernel - Re: [RFC] [PATCH] Device Tree on ARM platform

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Message-Id: <20090528093848.B048A832E416@gemini.denx.de>
Date:	Thu, 28 May 2009 11:38:48 +0200
From:	Wolfgang Denk <wd@...x.de>
To:	Robert Schwebel <r.schwebel@...gutronix.de>
cc:	Scott Wood <scottwood@...escale.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	devicetree-discuss <devicetree-discuss@...abs.org>,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	Janboe Ye <yuan-bo.ye@...orola.com>,
	Timur Tabi <timur@...escale.com>, rmk@....linux.org.uk
Subject: Re: [RFC] [PATCH] Device Tree on ARM platform

Dear Robert Schwebel,

In message <20090528000707.GR6805@...gutronix.de> you wrote:
>
> Until now, oftree has created more problems than it has solved for us.
> The idea works fine for well-known things like memory maps and
> interrupts. It works badly for corner cases, and embedded land is full
> of it. The effort to get the oftree stuff right is often more than a
> magnitude of order higher than the effort for the actual functionality.

Well, but isn't this also because the device tree dramatically
reduced the amount of effort to get a new board supported? We have
seen a number of cases where _only_ the device tree needed
significant efforts to get a basic BSP running on a new board.
Talking about ration of device tree efforts versus code writing
efforts is somewhat irrelevant when you ignore that the total effort
goes down. Sometimes significantly.

> That should be an alarm sign that something is wrong.

Maybe the interpretation of data?

Best regards,

Wolfgang Denk

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