linux-kernel - Re: [PATCH 1/1] [Blackfin] char driver for Blackfin on-chip OTP memory

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Message-Id: <200801300739.21344.rgetz@blackfin.uclinux.org>
Date:	Wed, 30 Jan 2008 07:39:20 -0500
From:	Robin Getz <rgetz@...ckfin.uclinux.org>
To:	"Jiri Slaby" <jirislaby@...il.com>
Cc:	"Bryan Wu" <bryan.wu@...log.com>, linux-kernel@...r.kernel.org,
	"Mike Frysinger" <michael.frysinger@...log.com>
Subject: Re: [PATCH 1/1] [Blackfin] char driver for Blackfin on-chip OTP memory

On Wed 30 Jan 2008 06:00, Jiri Slaby pondered:
> On 01/30/2008 11:36 AM, Bryan Wu wrote:
> > From: Mike Frysinger <michael.frysinger@...log.com>
> > 
> > initial char driver for otp memory
> > (only read supported atm ... needs real examples/docs for write support)
> > 
> > Signed-off-by: Mike Frysinger <michael.frysinger@...log.com>
> > Signed-off-by: Bryan Wu <bryan.wu@...log.com>

> > +	bfin_otp_class = class_create(THIS_MODULE, "otp");
> > +	device_create(bfin_otp_class, NULL, bfin_otp_dev_node, "otp");
> 
> Anyway, wouldn't be easier/better to use misc.c functionality here 
> (misc_register() et al.)?

OTP (one time programmable) memory are not registers, they are small blocks 
(8k bytes) of non violate on chip memory, for storing things that you don't 
want other people to look at via a PCB level probe. (like keys), or things 
that are just helpful - like MAC addresses.

-Robin
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