The ULP1 (Ultra Low-power mode 1) is introduced by SAMA5D2. In order to achieve the lowest power consumption, in the ULP1 mode, all the clocks are shut off, inclusive the embedded 12MHz RC oscillator. The fast startup signal is used as a wake up source for ULP1 mode. As soon as the wake up event is asserted, the embedded 12MHz RC oscillator restarts automatically, which fast startup signal to trigger the PMC to wake up the system from the ULP1 mode can be configured via DT. Changes in v6: - Add Acked-by tag. - Add specific sama5d2_pm_init() for SAMA5D2, which supports ULP1. It is called sama5d2_dt_device_init(). Instead of by reading the PMC version to check if it supports ULP1. - Add comment to describe the platform condition of calling at91_pm_ulp1_mode(). - Update the commit log. - Add a new patch to support a new DT_MACHINE for SAMA5D2. Changes in v5: - to improve the scalability, rework the DT expression part, use the child nodes to describe the wake-up input and its active level. - due to the DT property expression change, update the binding document. - due to the DT property expression change, update the fast restart node's property. Changes in v4: - add Acked-by tag. - add fast_restart node to the DT file. Changes in v3: - use 0 and 1, not string, to define the trigger active polarity. - update the property description. Changes in v2: - fix label pm_exit to ulp_exit. - shorten the pmc-fast-startup property's name. - use the value property, instead of bool property for high or low triggered. - change the property name and property description. Wenyou Yang (6): ARM: at91: sama5: Add a new DT_MACHINE for SAMA5D2 ARM: at91: pm: Create a procedure for the ULP0 mode ARM: at91: pm: Add ULP1 mode support ARM: at91: pm: Configure PMC fast startup signals Documentation: atmel-pmc: Add DT bindings for fast startup ARM: at91/dt: sama5d2_xplained: Add fast_restart node .../devicetree/bindings/arm/atmel-pmc.txt | 52 +++++++ arch/arm/boot/dts/at91-sama5d2_xplained.dts | 19 +++ arch/arm/mach-at91/generic.h | 2 + arch/arm/mach-at91/pm.c | 83 ++++++++++- arch/arm/mach-at91/pm.h | 7 + arch/arm/mach-at91/pm_suspend.S | 160 ++++++++++++++++++--- arch/arm/mach-at91/sama5.c | 26 +++- include/linux/clk/at91_pmc.h | 16 +++ 8 files changed, 338 insertions(+), 27 deletions(-) -- 2.7.4 -- 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
