linux-kernel - Re: [PATCH V3 0/8] ARM: cpuidle: Unify the ARM64/ARM DT approach

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Message-ID: <550C695B.7080200@linaro.org>
Date:	Fri, 20 Mar 2015 19:39:23 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC:	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"robherring2@...il.com" <robherring2@...il.com>,
	"arnd@...db.de" <arnd@...db.de>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"lina.iyer@...aro.org" <lina.iyer@...aro.org>,
	"sboyd@...eaurora.org" <sboyd@...eaurora.org>
Subject: Re: [PATCH V3 0/8] ARM: cpuidle: Unify the ARM64/ARM DT approach

On 03/20/2015 07:31 PM, Lorenzo Pieralisi wrote:
> Hi Daniel,
>
> On Fri, Mar 20, 2015 at 11:43:53AM +0000, Daniel Lezcano wrote:
>> There is a big number of cpuidle drivers for the ARM architecture.
>>
>> These drivers have been cleaned up and grouped into the drivers/cpuidle
>> directory to keep track of the changes more easily and ensure the code
>> is following the same scheme across the drivers.
>>
>> That had the benefit of simplifying the code and factor out a lot of common
>> parts. Beside that, as the drivers belong to the 'drivers' directory, we had
>> to split the arch specific bits and the generic code in order to keep
>> everything self contained. The platform driver paradigm was used for this
>> purpose.
>>
>> Unfortunately, this approach is now no longer accepted and a different solution
>> must be provided to reach the same goal: one example is the Qualcomm cpuidle
>> driver upstreaming attempt.
>>
>> In the meantime, ARM64 developed a generic cpuidle driver based on DT definition.
>>
>> The DT definition provides an 'enable-method' to specify one of the cpu
>> operations (PSCI, ...).
>>
>> This patchset unify this driver with ARM32, using the same DT definition.
>>
>> Thanks with this patchset we can use the 'enable-method' to specify a cpu
>> operations, hence get rid of the platform driver approach and go further in the
>> cpuidle driver flexibility via the DT.
>
> I had a look and the series seems fine, if you have a branch I can pull from
> I will test on arm64 and add the required tags.

Yes, sure.

http://git.linaro.org/git-ro/people/daniel.lezcano/linux.git cpuidle/4.1

Thanks !

   -- Daniel


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