On Mon, Mar 25, 2019 at 07:13:53AM +0530, keerthy wrote: > > > On 3/23/2019 12:02 AM, Russell King - ARM Linux admin wrote: > > On Fri, Mar 22, 2019 at 10:46:14PM +0530, Keerthy wrote: > > > RTC plus DDR in self-refresh is power a saving mode where in the entire > > "a power" ? > > Will correct the above typo. > > > > > > system including the different voltage rails from PMIC are shutdown except > > > the ones feeding on to RTC and DDR. DDR is kept in self-refresh hence the > > As explained above All the voltage rails of PMIC are shut off except for RTC > and DDR Rails. You seem to be replying to yourself there - the quote above your reply there is what you wrote. > > > > contents are preserved. RTC ALARM2 is connected to PMIC_EN line once > > > we the ALARM2 is triggered we enter the mode with DDR in self-refresh > > > > Doesn't make sense. > > > > > and RTC Ticking. After a predetermined time an RTC ALARM1 triggers waking > > > up the system. > > > > Huh, you start off explaining the wiring above... how does RTC ALARM1 > > trigger waking up the system if RTC ALARM2 is connected to the PMIC > > and all other power is shut down? > The entire PMIC is shutdown but for RTC rail. RTC is a separate voltage > domain and is powered up during this power save mode. > > http://www.ti.com/lit/ug/spruhl7h/spruhl7h.pdf Page 2884. I'm not asking for a reference, I'm asking for your cover letter to make sense and actually be useful. Right now, it's far from that. Thanks. > > > > > > The control goes to bootloader. The bootloader then checks > > > RTC scratchpad registers to confirm it was an rtc_only wakeup and follows > > > a different path, configure bare minimal clocks for ddr and then jumps to > > > the resume address in another RTC scratchpad registers and transfers the > > > control to Kernel. Kernel then restores the saved context. > > > > > > The patch series adds rtc-only + DDR mode support am am437x > > > Tested DS0, rtc+ddr back and forth on am437x-gp-evm board. > > > > > > This mode works only with u-boot built with am43xx_evm_rtconly_defconfig > > > > > > Additional patch is needed for omap-gpio save restore which will > > > come as fixes later. > > > > > > Keerthy (5): > > > rtc: OMAP: Add support for rtc-only mode > > > rtc: interface: Add power_off_program to rtc_class_ops > > > arm: mach-omap2: pm33xx: Add support for rtc+ddr in self refresh mode > > > soc: ti: pm33xx: Push the am33xx_push_sram_idle to the top > > > soc: ti: pm33xx: AM437X: Add rtc_only with ddr in self-refresh support > > > > > > arch/arm/mach-omap2/pm33xx-core.c | 76 +++++++- > > > drivers/rtc/interface.c | 12 ++ > > > drivers/rtc/rtc-omap.c | 49 ++++- > > > drivers/soc/ti/Kconfig | 5 +- > > > drivers/soc/ti/pm33xx.c | 272 ++++++++++++++++++++++----- > > > include/linux/platform_data/pm33xx.h | 5 + > > > include/linux/rtc.h | 2 + > > > 7 files changed, 360 insertions(+), 61 deletions(-) > > > > > > -- > > > 2.17.1 > > > > > > > > > _______________________________________________ > > > linux-arm-kernel mailing list > > > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > > > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel > > > > > > -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up According to speedtest.net: 11.9Mbps down 500kbps up
