linux-kernel - Re: [PATCH 2/3] ARM: davinci: da850: Enable EHRPWM TBCLK from CFG

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Message-ID: <5142ACEA.4060305@ti.com>
Date:	Fri, 15 Mar 2013 10:38:58 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	"Philip, Avinash" <avinashphilip@...com>
CC:	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"Manjunathappa, Prakash" <prakash.pm@...com>
Subject: Re: [PATCH 2/3] ARM: davinci: da850: Enable EHRPWM TBCLK from CFG_CHIP1

On 3/15/2013 10:27 AM, Philip, Avinash wrote:
> On Thu, Mar 14, 2013 at 18:31:52, Nori, Sekhar wrote:
>> On 3/14/2013 4:07 PM, Philip Avinash wrote:
>>> da850 platforms require TBCLK synchronization in CFG_CHIP1 register for
>>> TBCLK enable in EHRPWM modules. Enabling of TBCLK is done only if EHRPWM
>>> DT node status is set to "okay" DT blob.
>>> Also adds macro definitions for DA8XX_EHRPWM_TBCLKSYNC and
>>> DA8XX_CFGCHIP1_REG.
>>
>> So there is actually a TBCLK in DA850 - it's just not modeled as a clock
>> similar to the way it is done on AM335x? If yes, then instead of adding
>> a dummy clock node and doing the TBCLK enable as part of init, why not
>> model TBCLK in clock tree even on DA850?
> 
> 
> TBCLK enabling should done from platform specific way. In DA850 it is done at
> CFGCHIP1 register. Unfortunately Davinci clock frame work will support only
> clock nodes inside PLLC and PSC modules. Handling of CFGCHP1 require

That's true at the moment, but that can be fixed.

> modifications in clock frame work.
> 
> Hence handling it as part of initialization.

I am curious as to how this clock is handled in am335x. I searched for
tbclk in arch/arm/ of linux-next but could not find any references.
Where should I be looking?

Thanks,
Sekhar
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