[PATCH v5 0/8] ARM: shmobile: R-Mobile: DT PM domain support

From: Geert Uytterhoeven
Date: Mon Nov 17 2014 - 08:32:48 EST

Hi Simon, Magnus, Rafael,

This patch series enables DT support for PM domains on Renesas R-Mobile SoCs.

Currently it's limited to R-Mobile A1 (r8a7740), but given the similarity of
the SYSC System-Controller on the various SH-Mobile/R-Mobile SoCs, and the
abstraction of PM domains in DT, it should be sufficiently generic to handle
other SoCs in the future (e.g. SH-Mobile AP4 (sh7372), SH-Mobile AG5 (sh73a0),
R-Mobile APE6 (r8a73a4)).

Functionality-wise, this behaves the same as the legacy (non-DT) version
(modulo missing DT support in some device drivers).

- This is based on Simon Horman's renesas-devel-20141117-v3.18-rc5, as
v3.18-rc5 has commit c16561e8df7a6476 ("PM / Domains: Change prototype
for the attach and detach callbacks").

- Rafael: I believe Simon needs your ack for "[1/8] PM / Domains: Add DT
bindings for power-on/off latencies", or needs to know you will take it

- I kept "[4/8] ARM: shmobile: R-Mobile: Enable module clocks if
!CONFIG_PM_RUNTIME", as commit 9cdd5fd742e684ee ("PM / domains: Kconfig:
always enable PM_RUNTIME when genpd enabled") is not yet upstream, and
needs some rework (recursive Kconfig dependency PM_GENERIC_DOMAINS <->

Changes compared to v4:
- Update for {at,de}tach_dev() taking a generic_pm_domain pointer

Changes compared to v3 (more detailed changelogs in the individual patches):
- I dropped the patch to add preliminary PM domain latencies, as I want to do
more measurements for PM domains that are currently never powered off.
Values seem to range between 8.5 and 26 us, depending on the PM domain.
- I dropped all patches related to QoS device latencies, as these need more
- The power-{on,off}-latency properties have been changed from a single value
to a list,
- Device save/restore state latencies have been dropped, as they're Linux
driver-specific, and thus don't belong in DT,
- Use proper pm_clk_create()/pm_clk_destroy(), and update for attach_dev()
returning an error code again,
- New patch to enable module clocks if !CONFIG_PM_RUNTIME,
- Always keep D4 powered, until the new Coresight code handles runtime
- Remove bogus power-domains properties from clock nodes, as these will not
be instantiated as platform devices,
- Add power-domains properties to the recently added TMU nodes,
- Added Acked-by, Reviewed-by.

Changes compared to v2 (more detailed changelogs in the individual patches):
- Minor changes to attach/detach callbacks,
- Really add the A4MP and D4 PM domains, as fixes are available (see
dependencies below),
- Scan DT topology to identify special PM domains (CPUs and console),
- Move PM domain power-on/off latencies to a separate patch.

Changes compared to v1 (more detailed changelogs in the individual patches):
- Several new patches: PM QoS device latencies in DT, attach/detach
- Run-Time management of the module clocks, making the hack in
drivers/sh/pm_runtime.c obsolete for DT platforms using genpd,
- Addition of PM QoS device latencies, specified from DT,
- Addition of build glue, so this builds and runs without additional
changes, incl. s2ram.

Please apply, thanks!

Geert Uytterhoeven (8):
PM / Domains: Add DT bindings for power-on/off latencies
PM / Domains: Add DT bindings for the R-Mobile System Controller
ARM: shmobile: R-Mobile: Use generic_pm_domain.attach_dev() for pm_clk
ARM: shmobile: R-Mobile: Enable module clocks if !CONFIG_PM_RUNTIME
ARM: shmobile: R-Mobile: Store SYSC base address in rmobile_pm_domain
ARM: shmobile: R-Mobile: Add DT support for PM domains
ARM: shmobile: r8a7740 dtsi: Add PM domain support
drivers: sh: Disable PM runtime for multi-platform r8a7740 with genpd

.../devicetree/bindings/power/power_domain.txt | 14 +-
.../bindings/power/renesas,sysc-rmobile.txt | 107 ++++++++
arch/arm/boot/dts/r8a7740.dtsi | 99 +++++++
arch/arm/mach-shmobile/Kconfig | 3 +-
arch/arm/mach-shmobile/pm-r8a7740.c | 14 +
arch/arm/mach-shmobile/pm-rmobile.c | 286 +++++++++++++++++++--
arch/arm/mach-shmobile/pm-rmobile.h | 3 +-
arch/arm/mach-shmobile/pm-sh7372.c | 11 +
drivers/sh/pm_runtime.c | 2 +
9 files changed, 520 insertions(+), 19 deletions(-)
create mode 100644 Documentation/devicetree/bindings/power/renesas,sysc-rmobile.txt




Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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