[PATCH 00/18] ARM: vf610: Suspend/resume with self-refresh mode

From: Stefan Agner
Date: Wed Mar 09 2016 - 21:16:29 EST

This is a reworked and extended respin of an older patchset posted
back in 2014:

This implementation supports Vybrids STOP (standby) and LPSTOP2
mode (mem). Only the latter puts the memory in self-refresh mode
and the SoC in a deep sleep state. However, self-refresh is only
supported if external pull-ups/downs are populated (which not
all hardware revisions have in place), therefor this patchset also
introduces a device tree property to denote whether memory can be
put into self-refresh mode or not.

The LPSTOP2 implementation is similar to the i.MX 6 implementation:
Entering and resuming from self-refresh mode is implemented in
assembler, and the function is copied to SRAM while entering suspend

There are several fixes and extensions necessary to make suspend
actually working, mainly because most blocks loose its state in
LPSTOP2 mode.

Feedback welcome! Especially the linking between the GPIOs of the
WKPU unit (which allows to use some GPIOs as wake-up source) and
the regular GPIO block seems rather hacky...

The code has been tested on a Colibri VF50 and VF61. Currently
there is an issue with USB Host not correctly restoring after
resume which could not yet been resolved.

Stefan Agner (18):
irqchip: vf610-gpc: add Vybrid GPC IRQ controller
ARM: dts: vf610: add GPC as new interrupt parent
ARM: dts: vf610-colibri: GPIO wakeup key
ARM: dts: vf610: add on-chip SRAM
ARM: dts: vf610: add modules required for PM
ARM: imx: clk-gate2: allow custom gate configuration
ARM: imx: clk-vf610: leave DDR clock on
ARM: clk: add WKPU unit
ARM: vf610: clk: add suspend/resume support
tty: serial: fsl_lpuart: support suspend/resume
pinctrl: pinctrl-imx: implement suspend/resume
gpio: vf610: add system PM suspend/resume
ARM: dts: vf610: add WKPU connection to GPIO
gpio: vf610: add support for WKPU unit
ARM: vf610: PM: initial suspend/resume support
ARM: vf610: PM: enable Suspend-to-RAM only if hardware fixes are in
Documentation: dt: add Vybrid DDR memory controller bindings
ARM: vf610: PM: enable SNVS access

.../bindings/arm/freescale/fsl,vf610-ddrmc.txt | 23 +
.../devicetree/bindings/gpio/gpio-vf610.txt | 6 +
arch/arm/boot/dts/vf-colibri-eval-v3.dtsi | 22 +
arch/arm/boot/dts/vfxxx.dtsi | 74 ++-
arch/arm/mach-imx/Makefile | 3 +
arch/arm/mach-imx/common.h | 10 +
arch/arm/mach-imx/mach-vf610.c | 8 +
arch/arm/mach-imx/pm-vf610.c | 649 +++++++++++++++++++++
arch/arm/mach-imx/suspend-vf610.S | 448 ++++++++++++++
drivers/clk/imx/clk-gate2.c | 7 +-
drivers/clk/imx/clk-vf610.c | 83 ++-
drivers/clk/imx/clk.h | 13 +-
drivers/gpio/gpio-vf610.c | 188 ++++++
drivers/irqchip/Makefile | 1 +
drivers/irqchip/irq-vf610-gpc.c | 138 +++++
drivers/pinctrl/freescale/pinctrl-imx.c | 63 ++
drivers/pinctrl/freescale/pinctrl-imx.h | 3 +
drivers/pinctrl/freescale/pinctrl-vf610.c | 6 +
drivers/tty/serial/fsl_lpuart.c | 16 +-
include/dt-bindings/clock/vf610-clock.h | 4 +-
20 files changed, 1750 insertions(+), 15 deletions(-)
create mode 100644 Documentation/devicetree/bindings/arm/freescale/fsl,vf610-ddrmc.txt
create mode 100644 arch/arm/mach-imx/pm-vf610.c
create mode 100644 arch/arm/mach-imx/suspend-vf610.S
create mode 100644 drivers/irqchip/irq-vf610-gpc.c