hi Neil, On Thu, 16 Jul 2020 at 14:05, Neil Armstrong <narmstrong@xxxxxxxxxxxx> wrote: > > Hi, > > On 16/07/2020 10:20, Neil Armstrong wrote: > > Hi, > > > > On 16/07/2020 10:14, Anand Moon wrote: > >> Hi Neil, > >> > >> Thanks for your review comments. > >> > >> On Thu, 16 Jul 2020 at 12:35, Neil Armstrong <narmstrong@xxxxxxxxxxxx> wrote: > >>> > >>> Hi Anand, > >>> > >>> Only the vrtc is able to wakeup the device from suspend, > >>> the external RTC is not capable. > >>> > >>> Neil > >> > >> Now I have two RTC driver registered > >> > >> $ dmesg | grep rtc > >> [ 4.737315] rtc-pcf8563 0-0051: registered as rtc0 > >> [ 4.738763] rtc-pcf8563 0-0051: setting system clock to > >> 2020-07-16T08:00:46 UTC (1594886446) > >> [ 4.790206] meson-vrtc ff8000a8.rtc: registered as rtc1 > >> > >> And there are two nodes > >> # ls /dev/rtc* > >> /dev/rtc /dev/rtc0 /dev/rtc1 > >> > >> So it seames an issue that /dev/rtc0 is not able to handle wakeup events. > >> How can we resolve this issue? > >> > >> # time rtcwake -s 30 -m mem > >> rtcwake: /dev/rtc0 not enabled for wakeup events > > > > rtcwake -d /dev/rtc1 -s 30 -m mem > > > > As Christian reported off-list, it may be necessary to keep the vrtc as rtc0, > > so you should add aliases in the odroid-n2 DT to have vrtc as rtc0 and the on-board > > rtc as rtc1, but it may break the hwclock tools, so the reverse may be better > > but you'll need to specify rtc1 to rtcwake. > > While looking closer to the Odroid-N2 schematics and U-Boot/SCP Firmware, the external on-board > RTC can wake the device with the GPIO_AO 7, and wakeup is enabled in: > https://github.com/hardkernel/u-boot/blob/odroidn2-v2015.01/board/hardkernel/odroidn2/firmware/scp_task/pwr_ctrl.c#L143 > > So, something must be missing. > Ok I have missed this setting. But I could not find any more information on this configuration in S922X_Public_Datasheet_V0.2-Hardkernel, But HK uses the same set up as we do. https://github.com/hardkernel/linux/blob/odroidn2-4.9.y/arch/arm64/boot/dts/amlogic/mesong12_odroid_common.dtsi#L322-L333 I could not gather much input from this configration. Does VIM3 support VRTC or do they prefer rtc wakeup via RTC ? -Anand
