linux-kernel - Re: [PATCH v2 02/18] dt-bindings: timer: sp804: add timer-width property

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Date:	Tue, 22 Mar 2016 10:21:08 +0100
From:	Neil Armstrong <narmstrong@...libre.com>
To:	Robin Murphy <robin.murphy@....com>, Rob Herring <robh@...nel.org>
Cc:	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Sudeep Holla <sudeep.holla@....com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 02/18] dt-bindings: timer: sp804: add timer-width
 property

On 03/17/2016 08:21 PM, Robin Murphy wrote:
> On 17/03/16 19:00, Rob Herring wrote:
>> On Thu, Mar 17, 2016 at 1:06 PM, Robin Murphy <robin.murphy@....com> wrote:
>>> Hi Rob,
>>>
>>> On 17/03/16 17:09, Rob Herring wrote:
>>>> That would not be an SP804 nor would the vendor be ARM in that case. So
>>>> add a new compatible string for the vendor that decided to hack up ARM's
>>>> IP block.
>>>
>>>
>>> By all accounts this is some ancient reference design[1] which later evolved
>>> _into_ the SP804, so that vendor would probably still be ARM ;)
>>
>> Right.
>>
>>> A separate compatible string would indeed make more sense, though. Both
>>> semantically and in terms of letting the driver account for the differences
>>> automatically.
>>>
>>> Robin.
>>>
>>> [1]:http://infocenter.arm.com/help/topic/com.arm.doc.ddi0170a/I350250.html
>>
>> Humm, same as integrator timers perhaps?
> 
> Having had a quick look, what the Integrator/AP manual describes certainly smells like the same basic block as the "AMBA Timer" - 16 bit counters and the same control register layout - albeit in a mutant triple-timer version with a bigger offset between each register set. Integrator/CP, on the other hand, looks much more SP804-like.
> 
> Robin.
> 

Hi,

I will switch to oxsemi,ox810se-rps-timer since it need a specific register width that will be handled by the driver.

Thanks,
Neil