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

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Date:	Thu, 12 Mar 2015 15:25:34 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	lorenzo.pieralisi@....com, rjw@...ysocki.net
CC:	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
Subject: Re: [PATCH 0/6] ARM: cpuidle: Unify the ARM64/ARM DT approach


Catalin, Rob,

do you agree with this patchset ?

Thanks
   -- Daniel

On 03/03/2015 01:29 PM, 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 [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.
>
> Daniel Lezcano (6):
>    ARM: cpuidle: Remove duplicate header inclusion
>    ARM: cpuidle: Add a cpuidle ops structure to be used for DT
>    ARM64: cpuidle: Replace cpu_suspend by the common ARM/ARM64 function
>    ARM64: cpuidle: Rename cpu_init_idle to a common function name
>    ARM64: cpuidle: Remove arm64 reference
>    ARM: cpuidle: Enable the ARM64 driver for both ARM32/ARM64
>
>   arch/arm/include/asm/cpuidle.h                     | 12 +++
>   arch/arm/include/asm/cpuidle_ops.h                 |  3 +
>   arch/arm/kernel/cpuidle.c                          | 87 +++++++++++++++++++++-
>   arch/arm/mach-davinci/cpuidle.c                    |  1 -
>   arch/arm/mach-imx/cpuidle-imx6q.c                  |  1 -
>   arch/arm/mach-imx/cpuidle-imx6sl.c                 |  1 -
>   arch/arm/mach-imx/cpuidle-imx6sx.c                 |  1 -
>   arch/arm/mach-omap2/cpuidle44xx.c                  |  1 -
>   arch/arm/mach-tegra/cpuidle-tegra20.c              |  1 -
>   arch/arm/mach-tegra/cpuidle-tegra30.c              |  1 -
>   arch/arm64/include/asm/cpuidle.h                   |  9 ++-
>   arch/arm64/kernel/cpuidle.c                        |  2 +-
>   drivers/cpuidle/Kconfig                            |  7 +-
>   drivers/cpuidle/Kconfig.arm                        | 10 +++
>   drivers/cpuidle/Kconfig.arm64                      | 13 ----
>   drivers/cpuidle/Makefile                           |  5 +-
>   drivers/cpuidle/{cpuidle-arm64.c => cpuidle-arm.c} | 38 +++++-----
>   drivers/cpuidle/cpuidle-at91.c                     |  1 -
>   drivers/cpuidle/cpuidle-exynos.c                   |  1 -
>   drivers/cpuidle/cpuidle-kirkwood.c                 |  1 -
>   drivers/cpuidle/cpuidle-ux500.c                    |  1 -
>   drivers/cpuidle/cpuidle-zynq.c                     |  1 -
>   22 files changed, 139 insertions(+), 59 deletions(-)
>   create mode 100644 arch/arm/include/asm/cpuidle_ops.h
>   delete mode 100644 drivers/cpuidle/Kconfig.arm64
>   rename drivers/cpuidle/{cpuidle-arm64.c => cpuidle-arm.c} (72%)
>


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