linux-kernel - Re: [PATCH 14/14] ARM: ux500: Move rtc-pl031 registration to Device Tree when enabled

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Date:	Tue, 12 Jun 2012 15:44:51 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linus.walleij@...ricsson.com, arnd@...db.de,
	grant.likely@...retlab.ca
Subject: Re: [PATCH 14/14] ARM: ux500: Move rtc-pl031 registration to Device
 Tree when enabled

On 12/06/12 15:32, Linus Walleij wrote:
> On Tue, Jun 12, 2012 at 10:03 AM, Lee Jones<lee.jones@...aro.org>  wrote:
>> On 11/06/12 22:43, Linus Walleij wrote:
>
>>> Oh this is a bug fix really, well it's in the device tree so nevermind.
>>
>> It is? How so?
>
> That the device tree was declaring a compatible node for something
> that never existed (stericsson,db8500-rtc) while the real node is
> "arm,rtc-pl031", "arm,primecell".
>
> Without this fix 3.4 will not have an PL031 RTC I guess?

Think of the old entry as a dummy one, a stub if you will. Quite a few 
of the entries were initially loaded into the Device Tree as a best 
effort first attempt and had to be changed at a later date. This is no 
different. I see this as an enablement patch rather than a bug-fix. In 
fact, there would have been a bug if this worked when it was initially 
written, as the driver would have probed twice on a DT boot. Once by DT 
and once by platform code.

-- 
Lee Jones
Linaro ST-Ericsson Landing Team Lead
M: +44 77 88 633 515
Linaro.org │ Open source software for ARM SoCs
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