linux-kernel - Re: a case for a common efuse API?

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Message-ID: <20140709072420.GI7827@pengutronix.de>
Date:	Wed, 9 Jul 2014 09:24:20 +0200
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Stephen Warren <swarren@...dia.com>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	Peter De Schrijver <pdeschrijver@...dia.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Bjorn Andersson <bjorn.andersson@...ymobile.com>
Subject: Re: a case for a common efuse API?

Hi,

On Tue, Jul 08, 2014 at 01:00:23PM -0700, Stephen Boyd wrote:
> On MSM chips we have some efuses (called qfprom) where we store things
> like calibration data, speed bins, etc.
I don't have something constructive to say here, just want to point out
that on efm32 there is something similar. It's called "Device
Information (DI) Page" and contains "calibration values, a
unique identification number and other useful data".

Currently it is unused in mainline, but in my tree I access it directly
to determine cpu type (part number, part family number and Production
ID), flash and ram size, and the calibration settings for the ADC.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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