[PATCH v2 00/10] ARM: Exynos: PMU cleanup and refactoring for using DT

Tomasz Figa tomasz.figa at gmail.com
Fri Apr 25 15:43:55 PDT 2014

Hi Pankaj,

Just a small note - please refrain from sending next versions of series 
in reply to previous version. With threading applied, it gets hard to 
notice that a new version was posted, because the first message of the 
thread is always v1. Also it makes threads unnecessarily long.

Best regards,

On 25.04.2014 14:32, Pankaj Dubey wrote:
> This patch series, does some minor cleanup and modifies Exynos PMU related
> code for mapping and initialization of Exynos Power Management Unit (PMU)
> base address from device tree. This is also preparation for moving PMU
> related code out of machine folder and moving into a "drivers/mfd", so that
> ARM64 based SoC can utilize common piece of code. These patches require change
> in Exynos4210, Exynos4212 and Exynos4412 dtsi files, which has been posted
> as separate patch series [2]
> These patches are created on top of Kukjin Kim's for-next (v3.15-rc1 tag)
> branch.
> These patches depends on following two patch series:
> 1) mfd: syscon: Support early initialization
>     https://lkml.org/lkml/2014/4/8/239
> 2) Add PMU node for Exynos SoCs
>     http://www.mail-archive.com/linux-samsung-soc@vger.kernel.org/msg29329.html
> We have tested these patches on SMDK5250 and Arndale (Exynos5250) boards for
> System boot and PMU initialization and S2R.
> For testing on Arndale (Exynos5250) board:
> Tested-by: Pankaj Dubey <pankaj.dubey at samsung.com>
> Changes Since v1:
>   - Rebased on latest for-next of Kukjin Kim's tree.
>   - Added patch: "Make exynos machine_ops as static".
> 	For making more cleanup in "mach-exynos/common.h"
> 	as suggested by Tomasz Figa.
>   - Addressed comments of Tomasz Figa for cleaning "mach-exynos/common.h".
>   - Updated patch: Remove file path from comment section
> 	As suggested by Michel Simek, instead of updating file path
> 	lets remove them from each file under "mach-exynos".
> 	Even though Kukjin pointed out that there is similar patch pending from
> 	Sachin/Tushar but since I could not find I have included this here. If
> 	I have missed something please point to any existing such patch.
>   - Updated patch: Add support for mapping PMU base address via DT
> 	- Removed __initdata from declaration of "exynos_pmu_base", as it caused
> 	kernel crash as pointed out by Vikas Sajjan.
> 	- Added support for Syscon initialization and getting PMU regmap handle
> 	as suggested by Sylwester. Since current implementation of early
> 	intialization [1] has limitation that "early_syscon_init" requires
> 	DT to be unflattened and system should be able to allocate memory,
> 	we can't use regmap handles for platsmp.c file as "smp_secondary_init"
> 	will be called before DT unflattening. So I have kept both method for
> 	accessing PMU base address. platsmp.c will use ioremmaped address where
> 	as rest other files can use regmap handle.
>   - Added patch: Remove "linux/bug.h" from pmu.c.
>   - Updated patch: Refactored code for PMU register mapping via DT
> 	- Modified to use regmap_read/write when using regmap handle.
>   - Added patch: Move "mach/map.h" inclusion from regs-pmu.h to platsmp.c
>   - Added patch: Add device tree based initialization support for PMU.
> 	- Convert existing PMU implementation to be a device tree based
> 	 before moving it to "drivers/mfd" folder. As suggested by Bartlomiej.
> 	- Dropped making a platform_driver for PMU, as currently PMU binding
> 	has two compatibility strings as "samsung, exynosxxx-pmu", "syscon",
> 	once we	enable MFD_SYSCON config option, current "syscon" driver probe
> 	gets called and PMU probe never gets called. So modified PMU
> 	initialization code to scan DT and match against supported compatiblity
> 	string in driver code, and once we get matching node use that for
> 	accessing PMU regmap handle using "syscon_early_regmap_lookup_by_phandle".
> 	If there is any better solution please suggest.
> Pankaj Dubey (6):
>    ARM: EXYNOS: Make exynos machine_ops as static
>    ARM: EXYNOS: Cleanup "mach-exynos/common.h" file
>    ARM: EXYNOS: Remove file path from comment section
>    ARM: EXYNOS: Refactored code for using PMU address via DT
>    ARM: EXYNOS: Move "mach/map.h" inclusion from regs-pmu.h to platsmp.c
>    ARM: EXYNOS: Add device tree based initialization support for PMU.
> Young-Gun Jang (4):
>    ARM: EXYNOS: Move SYSREG definition into sys-reg specific file.
>    ARM: EXYNOS: Remove regs-pmu.h header dependency from pm_domain
>    ARM: EXYNOS: Add support for mapping PMU base address via DT
>    ARM: EXYNOS: Remove "linux/bug.h" from pmu.c
>   arch/arm/mach-exynos/Kconfig               |    2 +
>   arch/arm/mach-exynos/common.h              |   13 +-
>   arch/arm/mach-exynos/cpuidle.c             |   37 +-
>   arch/arm/mach-exynos/exynos.c              |  104 +++++-
>   arch/arm/mach-exynos/headsmp.S             |    2 -
>   arch/arm/mach-exynos/hotplug.c             |    7 +-
>   arch/arm/mach-exynos/include/mach/map.h    |    3 -
>   arch/arm/mach-exynos/include/mach/memory.h |    3 +-
>   arch/arm/mach-exynos/platsmp.c             |   17 +-
>   arch/arm/mach-exynos/pm.c                  |   61 ++--
>   arch/arm/mach-exynos/pm_domains.c          |    2 +-
>   arch/arm/mach-exynos/pmu.c                 |  191 ++++++++---
>   arch/arm/mach-exynos/regs-pmu.h            |  512 ++++++++++++++--------------
>   arch/arm/mach-exynos/regs-sys.h            |   22 ++
>   14 files changed, 585 insertions(+), 391 deletions(-)
>   create mode 100644 arch/arm/mach-exynos/regs-sys.h

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