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arm64: renesas: Enable PM and PM_GENERIC_DOMAINS for SoCs with PM Domains

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All supported Renesas ARM64 SoCs have clock and power domains. To ensure
proper operation of on-SoC modules, module clocks must be ungated, and
power domains must be powered up when needed.

Currently the user can choose to build a kernel with power management
enabled or disabled:
  - If CONFIG_PM=y, power domains and/or module clocks are handled
    dynamically by Runtime PM and the generic power domain.
  - If CONFIG_PM=n, power domains are assumed to be powered up by reset
    state or by the boot loader, and module clocks are handled by the
    legacy clock domain on driver (un)bind.
    The latter is implemented using a platform bus notifier, which
    applies not only to all on-SoC devices, but to all platform devices
    present in the system.

To remove the dependency on implicit assumptions, and to get rid of the
peculiarities of the legacy clock domain, enable CONFIG_PM and
CONFIG_PM_GENERIC_DOMAINS unconditionally.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Geert Uytterhoeven 2016-02-16 15:29:10 +01:00 committed by Simon Horman
parent f7e020512e
commit 2ee98234b8
1 changed files with 2 additions and 1 deletions
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3
arch/arm64/Kconfig.platforms
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@ -76,7 +76,8 @@ config ARCH_RENESAS
bool "Renesas SoC Platforms"
select ARCH_SHMOBILE
select PINCTRL
select PM_GENERIC_DOMAINS if PM
select PM
select PM_GENERIC_DOMAINS
select RENESAS_IRQC
help
This enables support for the ARMv8 based Renesas SoCs.