[PATCH 0/9] ARM: vf610: Suspend/resume support

[Bill Pringlemeir]

On 22 Sep 2014, stefan at agner.ch wrote:

> This patchset provides suspend/resume support for Freescale Vybrid
> SoC (vf610). The code is generally aligned to the implementation
> for i.MX6. The subsystems SRC and GPC need some changes to support
> the Vybrid specific implementation.
>
> This patchset relies on GPIO driver to be present (in order to
> provide a wakeup source) as well as using the ARM Global Timer
> clock source (the Vybrid specifc PIT clock source, vf_pit_timer.c
> does not support shutdown).
>
> The implemented sleep states (LP-RUN and STOP), are not the most
> power saving functions available on Vybrid. Especially for
> suspend-to-memory one of the LPSTOP modes looks more appropriate.
> However, the complexity is somewhat higher (we would need to move
> execution path to SRAM and store IOMUX and DDRMC configuration).
> Currently, I have not the resources to look into that so I hope
> that this initial code qualifies as power saving functions to be
> applied.
>
> Suspend-to-memory as well as standby mode is tested on Colibri
> VF61.

> Power measurement (Colibri VF61, whole module):
> - Idle: 540mW
> - LP-RUN: 220mW (standby)
> - STOP: 200mW (mem)

> Stefan Agner (9):
> ARM: dts: vf610: Add system reset controller (SRC)
> ARM: dts: vf610: add global power controller (GPC)
> ARM: dts: vf610: add on-chip SRAM

These above three change sets have some implications for dual-chip
(Cortex-A5/Cortex-M4) configurations.  Epecially those running MQX.
There is not harm to define the register space (except DT size).
However, if you activate drivers that manipulate the registers for all
systems, then there is no choice to have MQX work on the 2nd core.

I think that Shawn Guo already did a patchset to remove stuff from the
vf610.dtsi to the machine/configuration DT files.

> ARM: dts: vf610-colibri: GPIO power key
> gpio: vf610: Extend with wakeup support
> ARM: imx: gpc: Support vf610 global power controller
> ARM: imx: src: Support vf610 system reset controller
> ARM: imx: clk-gate2: allow custom gate configuration
> ARM: vf610: initial suspend/resume support
>
> arch/arm/boot/dts/vf610-colibri-eval-v3.dts | 26 ++
> arch/arm/boot/dts/vf610.dtsi | 33 +++ arch/arm/mach-imx/Kconfig | 2 +
> arch/arm/mach-imx/Makefile | 1 + arch/arm/mach-imx/clk-gate2.c | 7 +-
> arch/arm/mach-imx/clk-vf610.c | 6 + arch/arm/mach-imx/clk.h | 13 +-
> arch/arm/mach-imx/common.h | 14 +- arch/arm/mach-imx/gpc.c | 61 ++--
> arch/arm/mach-imx/mach-imx6q.c | 2 +- arch/arm/mach-imx/mach-imx6sl.c
> | 2 +- arch/arm/mach-imx/mach-vf610.c | 9 +
> arch/arm/mach-imx/pm-vf610.c | 428 ++++++++++++++++++++++++++++
> arch/arm/mach-imx/src.c | 11 + drivers/gpio/gpio-vf610.c | 16 ++
> include/dt-bindings/clock/vf610-clock.h | 3 +- 16 files changed, 605
> insertions(+), 29 deletions(-) create mode 100644
> arch/arm/mach-imx/pm-vf610.c