linux-kernel - Re: [PATCH 2/4] of: DT quirks infrastructure

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Date:	Thu, 19 Feb 2015 19:22:54 +0100
From:	Maxime Bizon <mbizon@...ebox.fr>
To:	Sylvain Rochet <gradator@...dator.net>
Cc:	Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
	Mark Rutland <mark.rutland@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Tony Lindgren <tony@...mide.com>,
	Koen Kooi <koen@...inion.thruhere.net>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Matt Porter <matt.porter@...aro.org>, frowand.list@...il.com,
	Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH 2/4] of: DT quirks infrastructure


On Thu, 2015-02-19 at 19:12 +0100, Sylvain Rochet wrote:

> Or use a 1-wire or I2C EEPROM to store your board information.

no, you don't reduce the human error probability.

eeprom needs to be preprogrammed, factory will at some point have a lot
of eeprom with different version, and will potentially equip the wrong
one.

much more error prone than them putting the resistor at the wrong place.

> Or, even better, if you have an I2C device, just chose a different 
> address on each board for this device and then probe I2C devices in your 
> boot loader until you found one you are looking for, this way, you don't 
> need spare GPIO at all. You don't even need to populate the same I2C 
> device on all boards, you can actually probe anything.

I'm not a fan of schemes where not probing something is not a definitive
sign of hardware failure.

-- 
Maxime


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