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SubjectRe: [PATCH v5 0/5] ARM: Exynos: PMU cleanup and refactoring for using DT
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On Wed, Jun 25, 2014 at 7:33 PM, Pankaj Dubey <pankaj.dubey@samsung.com> wrote:
> This patch series, modifies Exynos Power Management Unit (PMU) related code
> for converting it into a platform_driver. This is also preparation for moving
> PMU related code out of machine folder into a either "drivers/mfd", or
> "drivers/power" or some other suitable place so that ARM64 based SoC can
> utilize common piece of code.
>
> These patches are created on top of Kukjin Kim's for-next.
> I have tested this patches on Exynos5250 Snow board for system boot and S2R.
>
> This patch series depends on following two patch series:
> [1]: mfd: syscon: Decouple syscon interface from syscon devices.
> https://lkml.org/lkml/2014/6/24/188
>
> [2]: Cleanup patches for mach-exynos.
> http://www.spinics.net/lists/arm-kernel/msg341474.html
>
> Patch v4 and discussion can be found here:
> https://lkml.org/lkml/2014/5/10/29
>
> Changes Since v4:
> - Splitted patch series in two parts. Part 1 has code cleanup under mach-exynos
> and posted as separate patch [2]. Current patchset is part 2 which modified
> exynos pmu implementation for making it platform driver.
> - Removed dependency over early_syscon API.
> - Removed usage of regmap read/write APIs.
> - Modified probe function to register exynos pmu as syscon provider using
> Tomasz Figa's syscon patch [1].
> - Address various other review comments from Tomasz Figa.
> - Removed signed-off-by of Young-Gun Jang <yg1004.jang@samsung.com>,
> as this id is no more valid. Taking ownership of all his patches.
>
> Changes Since v3:
> - Optimized exynos_pmu_probe function by removing exynos_pmu_data_init
> as suggested by Vikas Sajjan.
> - Modified syscon_early_regmap_lookup_by_phandle and
> syscon_regmap_lookup_by_phandle function call to pass property as NULL.
>
> Changes Since v2:
> - Rebased on top of Daniel Lezcano's Exynos cpuidle refactor patches.
> - Removed early mapping of PMU base address from exynos.c and removed
> "get_exynos_pmuaddr" function. Instead of this added code in platsmp.c
> to get PMU base address using of_iomap as suggested by Tomasz Figa.
> - Converted PMU implementation into platform_driver by using static
> platform_device method.
>
> Changes Since v1:
> - Rebased on latest for-next of Kukjin Kim's tree.
> - 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.
> - Updated patch: Refactored code for PMU register mapping via DT
> - Modified to use regmap_read/write when using regmap handle.
> - 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 (5):
> ARM: EXYNOS: Add support for mapping PMU base address via DT
> 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 platform driver support for Exynos PMU
> ARM: EXYNOS: Move PMU specific definitions from common.h
>
> arch/arm/mach-exynos/Kconfig | 1 +
> arch/arm/mach-exynos/common.h | 18 +-
> arch/arm/mach-exynos/exynos-pmu.h | 31 ++
> arch/arm/mach-exynos/exynos.c | 63 +++-
> arch/arm/mach-exynos/include/mach/map.h | 3 -
> arch/arm/mach-exynos/mcpm-exynos.c | 5 +-
> arch/arm/mach-exynos/platsmp.c | 4 +-
> arch/arm/mach-exynos/pm.c | 80 ++--
> arch/arm/mach-exynos/pmu.c | 223 ++++++++---
> arch/arm/mach-exynos/regs-pmu.h | 510 +++++++++++++-------------
> arch/arm/plat-samsung/include/plat/map-s5p.h | 1 -
> 11 files changed, 556 insertions(+), 383 deletions(-)
> create mode 100644 arch/arm/mach-exynos/exynos-pmu.h
>

Tested S2R with the entire series on exynos5420 based Chromebook.

Tested-by: Vikas Sajjan <vikas.sajjan@samsung.com>


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