linux-kernel - Re: [PATCH 0/6] ARM: cpuidle: Unify the ARM64/ARM DT approach

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Message-ID: <5503197C.8030105@linaro.org>
Date:	Fri, 13 Mar 2015 18:08:12 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Kevin Hilman <khilman@...nel.org>
CC:	lorenzo.pieralisi@....com, rjw@...ysocki.net,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Catalin.Marinas@....com, robherring2@...il.com, arnd@...db.de,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	lina.iyer@...aro.org,
	"keita.kobayashi.ym@...esas.com >> Keita Kobayashi" 
	<keita.kobayashi.ym@...esas.com>
Subject: Re: [PATCH 0/6] ARM: cpuidle: Unify the ARM64/ARM DT approach

On 03/13/2015 06:03 PM, Kevin Hilman wrote:
> Daniel Lezcano <daniel.lezcano@...aro.org> writes:
>
>> 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 [1].
>>
>> 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 really like that these two are unified now.
>
> Acked-by: Kevin Hilman <khilman@...aro.org>

Thanks for reviewing the patchset.

   -- Daniel


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