linux-kernel - Re: [PATCH] clk: bcm: Add driver for Northstar ILP clock

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Message-ID: <23e2aa2f-a0ff-f72e-5e98-ea539c6fb69d@gmail.com>
Date:	Fri, 29 Jul 2016 13:55:55 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Rafał Miłecki <zajec5@...il.com>,
	Ray Jui <ray.jui@...adcom.com>
Cc:	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>, linux-clk@...r.kernel.org,
	bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
	Rafał Miłecki <rafal@...ecki.pl>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Jon Mason <jonmason@...adcom.com>,
	Eric Anholt <eric@...olt.net>,
	Stephen Warren <swarren@...dotorg.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clk: bcm: Add driver for Northstar ILP clock

On 07/29/2016 01:52 PM, Rafał Miłecki wrote:
> On 29 July 2016 at 22:49, Ray Jui <ray.jui@...adcom.com> wrote:
>> On 7/29/2016 1:46 PM, Rafał Miłecki wrote:
>>> On 29 July 2016 at 22:44, Ray Jui <ray.jui@...adcom.com> wrote:
>>>>
>>>> On 7/29/2016 5:58 AM, Rafał Miłecki wrote:
>>>>>
>>>>>
>>>>> From: Rafał Miłecki <rafal@...ecki.pl>
>>>>>
>>>>> This clock is present on cheaper Northstar devices like BCM53573 or
>>>>> BCM47189 using Corex-A7. This driver uses PMU (Power Management Unit)
>>>>> to calculate clock rate and allows using it in a generic (clk_*) way.
>>>>>
>>>>
>>>> I thought Northstar uses Cortex A9 instead of A7?
>>>
>>>
>>> [    0.000000] CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7),
>>> cr=10c5387d
>>> [    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing
>>> instruction cache
>>> [    0.000000] Machine model: Tenda AC9
>>>
>>
>> Yeah ARMv7 instruction set but the core is Cortex A7. Both Cortex A7 and A9
>> use ARMv7 instructions.
> 
> OK, sorry for irrelevant part then :)
> 
> This is from BCM4709C0:
> bcma: bus0: Core 10 found: ARM Cortex A9 core (ihost) (manuf 0x4BF, id
> 0x510, rev 0x07, class 0x0)
> 
> This is from BCM47189B0::
> bcma: bus0: Core 3 found: ARM CA7 (manuf 0x4BF, id 0x847, rev 0x00, class 0x0)
> 

This is indeed a Cortex A7-based chip, not clear if putting this chip in
the Northstar family is accurate here because it really seems to have a
different architecture from the NS/NSP family here...
-- 
Florian