linux-kernel - Re: [PATCH v2 4/4] PMC driver: Add Cherrytrail PMC interface

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Message-ID: <54C5A6D2.5000005@linux.intel.com>
Date:	Mon, 26 Jan 2015 10:30:42 +0800
From:	"Li, Aubrey" <aubrey.li@...ux.intel.com>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC:	x86@...nel.org, "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	"Kumar P, Mahesh" <mahesh.kumar.p@...el.com>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2 4/4] PMC driver: Add Cherrytrail PMC interface

On 2015/1/22 17:26, Andy Shevchenko wrote:
> On Thu, 2015-01-22 at 12:02 +0800, Li, Aubrey wrote:
>> On 2015/1/21 5:50, Andy Shevchenko wrote:
>>> The patch adds CHT PMC interface. This exposes all the South IP device power
>>> states and S0ix states for CHT. The bit map of FUNC_DIS and D3_STS_0 registers
>>> for SoCs are consistent. The D3_STS_1 and FUNC_DIS_2 registers, however, are
>>> not aligned. This is fixed by splitting a common mapping on per register basis.
>>>
>> Should we define the bit map table completely separate for different
>> platforms? My concern is, when D3_STS_0 and FUNC_DIS becomes not
>> consistent in a new SoC, the implementation in this patch has to be
>> rewritten completely.
>>
>> Defining entire bit map table for different platform introduces
>> reduplicated bit definitions, but when we add a new platform in future,
>> we don't need to consider the existing platforms definition, and no need
>> to change code structure any longer.
>>
>> Thoughts?
>>
> 
> But this what I did by introducing pmc_reg_map structure per SoC.
> You may or may not use previous definitions.
> 
okay, it makes sense to me.

Thanks,
-Aubrey

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