linux-kernel - Re: [PATCH 0/4 V2] pch_uart: Cleanups, board quirks, and user uartclk parameter

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Message-ID: <4F4FCE18.4050400@linux.intel.com>
Date:	Thu, 01 Mar 2012 11:29:28 -0800
From:	Darren Hart <dvhart@...ux.intel.com>
To:	Feng Tang <feng.tang@...el.com>
CC:	Tomoya MORINAGA <tomoya.rohm@...il.com>,
	Alan Cox <alan@...ux.intel.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-serial@...r.kernel.org
Subject: Re: [PATCH 0/4 V2] pch_uart: Cleanups, board quirks, and user uartclk
 parameter



On 02/29/2012 06:40 PM, Feng Tang wrote:
> On Wed, Feb 29, 2012 at 05:12:08PM -0800, Darren Hart wrote:
>>
>>
>> On 02/29/2012 05:06 PM, Tomoya MORINAGA wrote:
>>> 2012年3月1日9:47 Darren Hart <dvhart@...ux.intel.com>:
>>>> how do we force the
>>>> 192MHz clock setting BEFORE the pch_phub code runs?
>>>
>>> To realize your requirement,
>>> I think that set by BIOS is only way.
>>
>> Perhaps a pch_phub.bios_uartclk parameter could be used for setting up
>> the initial console and once the phub driver is loaded, it can make the
>> necessary changes and fix things up in the uart port? This would add a
>> binding between the pch_uart and pch_phub code.
>>
>> Thoughts?
> 
> To satisfy the early console, one way may be add a x86_init_ops for all
> Tunnel Creek compatible platform like what Moorestown/Medfield have done,
> and insert the uart clk setting work into one of the early init function. 
> 

I believe this is inline with what Alan was recommending in his response
to the V1 patch series, and it sounds like a reasonable next step.

-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel
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