This is a reworked and extended respin of an older patchset posted back in 2014: http://lkml.iu.edu/hypermail/linux/kernel/1409.2/03734.html 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 mode. 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 place 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 -- 2.7.2 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
