linux-kernel - Re: [PATCH] drivers, char: add U-Boot bootcount driver

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Message-ID: <4EDEA3BF.6020507@gmail.com>
Date:	Tue, 06 Dec 2011 17:22:39 -0600
From:	Rob Herring <robherring2@...il.com>
To:	Wolfram Sang <w.sang@...gutronix.de>
CC:	Wolfgang Denk <wd@...x.de>, devicetree-discuss@...ts.ozlabs.org,
	Heiko Schocher <hs@...x.de>, linux-kernel@...r.kernel.org,
	Vitaly Bordug <vbordug@...mvista.com>,
	linux-watchdog@...r.kernel.org
Subject: Re: [PATCH] drivers, char: add U-Boot bootcount driver

On 12/06/2011 04:06 PM, Wolfram Sang wrote:
> 
>>> bootcount itself is not a device. It is a feature of certain devices. And that
>>> needs to be implemented; possibly generic enough that it can work for register
>>> based, i2c based, and so forth, accesses.
>>
>> If "boot counter" is not a good name for such a device, then what name
>> would you suggest?
> 
> None.
> 
>> Or do you think a counter (which can be implemented in a number of
>> different ways, depending on hardware specifics) is not a device?
> 
> Yes.
> 
>> What would be such a device, then?
> 
> "maxim,ds1338"
> 
> Please have a look at the devicetree.org-wiki-page I just mentioned:
> 
> http://devicetree.org/Device_Tree_Usage
> 

Perhaps fs/pstore would be a good choice for the user space interface
(defining a new file bootcount). This can support any arbitrary backing
device although pretty much only ACPI is implemented.

Rob

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