Hi Markus, On Tue, 11 Mar 2025 at 16:02, Markus Schneider-Pargmann <m...@baylibre.com> wrote: > > Hi, > > this series introduces support to resume from IO+DDR. IO+DDR is a low > power mode of am62a and am62p in which nearly everything is powered off > except DDR which is in self-refresh and a few pins which detect > activity and can wakeup the system again. > > On resume uboot SPL is loaded and checks if this is a IO+DDR resume. If > it is, the DDR initialization sequence in k3-ddrss differs slightly as > it has to get the DDR out of the self-refresh. > > Afterwards a specific address determined from DT is used to get the > metadata that stores relevant context addresses. The context is restored > using the tisci message TI_SCI_MSG_MIN_CONTEXT_RESTORE. At the end all > further initializations are skipped and uboot SPL directly jumps into > the DM resume address which takes care of the rest. > > The devicetree R5F related patches were picked up from the mailinglist > and are required to find the correct address of the metadata. > > k3-ddrss is using absolute register accesses at the moment. I am trying > to submit syscon DT patches upstream to access these through syscon, > unfortunately there is ongoing discussion regarding syscon. > > I tested this on am62a. > > Best, > Markus > > To: Tom Rini <tr...@konsulko.com> > To: Vignesh Raghavendra <vigne...@ti.com> > To: Bryan Brattlof <b...@ti.com> > To: Sumit Garg <sumit.g...@linaro.org> > Cc: u-boot@lists.denx.de > > Cc: Vishal Mahaveer <vish...@ti.com> > Cc: Kevin Hilman <khil...@baylibre.com> > Cc: Dhruva Gole <d-g...@ti.com> > Cc: Sebin Francis <sebin.fran...@ti.com> > Cc: Kendall Willis <k-wil...@ti.com> > Cc: Akashdeep Kaur <a-k...@ti.com> > > Signed-off-by: Markus Schneider-Pargmann <m...@baylibre.com> > --- > Devarsh Thakkar (3): > arm64: dts: ti: k3-am62a-wakeup: Add R5F device node > arm64: dts: ti: k3-am62a7-sk: Enable IPC with remote processors > arm64: dts: ti: k3-am62p5-sk: Enable IPC with remote processors > > Hari Nagalla (2): > arm64: dts: ti: k3-am62a-mcu: Add R5F remote proc node > arm64: dts: ti: k3-am62x-sk-common: Enable IPC with remote processors > > Jai Luthra (1): > arm64: dts: ti: k3-am62a-main: Add C7xv device node > > Markus Schneider-Pargmann (13): > arm: mach-k3: Remove CANUART IO isolation > arm: mach-k3: Kconfig: Add symbols for IO+DDR Low Power Mode > ram: k3-ddrss: Add support for DDR in self-refresh > firmware: ti_sci: Add TI_SCI_MSG_MIN_CONTEXT_RESTORE > arm: mach-k3: common: Add CANUART wakeup check helpers > arm: mach-k3: common: Add lpm_resume_from_ddr > arm: mach-k3: common: Helper for LPM meta data address from DT > arm: mach-k3: am62a7_init: Resume on LPM exit > arm: mach-k3: am62p5_init: Resume on LPM exit > arm: dts: k3-am62a: Add r5 device nodes > arm: dts: k3-am62p: Add r5 device nodes > configs: am62ax_evm_r5: Enable IODDR resume support > configs: am62p_evm_r5_defconfig: Enable IODDR resume support > > arch/arm/dts/k3-am62a7-sk-u-boot.dtsi | 16 +++ > arch/arm/dts/k3-am62p5-sk-u-boot.dtsi | 20 +++ > arch/arm/mach-k3/Kconfig | 9 ++ > arch/arm/mach-k3/am62ax/am62a7_init.c | 11 ++ > arch/arm/mach-k3/am62px/am62p5_init.c | 12 ++ > arch/arm/mach-k3/am62x/am625_init.c | 2 + > arch/arm/mach-k3/common.c | 162 +++++++++++++++++++++ > arch/arm/mach-k3/common.h | 4 + > arch/arm/mach-k3/include/mach/hardware.h | 32 +++++ > configs/am62ax_evm_r5_defconfig | 1 + > configs/am62px_evm_r5_defconfig | 1 + > drivers/firmware/ti_sci.c | 38 +++++ > drivers/firmware/ti_sci.h | 14 ++ > drivers/ram/k3-ddrss/k3-ddrss.c | 165 > ++++++++++++++++++++++
> dts/upstream/src/arm64/ti/k3-am62a-main.dtsi | 12 ++ > dts/upstream/src/arm64/ti/k3-am62a-mcu.dtsi | 25 ++++ > dts/upstream/src/arm64/ti/k3-am62a-wakeup.dtsi | 25 ++++ > dts/upstream/src/arm64/ti/k3-am62a7-sk.dts | 96 ++++++++++++- > dts/upstream/src/arm64/ti/k3-am62p5-sk.dts | 50 ++++++- > dts/upstream/src/arm64/ti/k3-am62x-sk-common.dtsi | 35 ++++- The dts/upstream is a git subtree and is rather a snapshot of upstream devicetree-rebasing repo. It's not allowed to directly patch it but rather we need to resync or cherry-pick patches from upstream [1]. So rather than picking patches from ML, you should wait for them to land in the Linux kernel for a cherry-pick to work. Or otherwise you can choose to rely on *-u-boot.dtsi for the time being. [1] https://docs.u-boot.org/en/latest/develop/devicetree/control.html#resyncing-with-devicetree-rebasing -Sumit > include/linux/soc/ti/ti_sci_protocol.h | 9 ++ > 21 files changed, 721 insertions(+), 18 deletions(-) > --- > base-commit: a517796cfa5d8f4ca2f0c11c78c24a08a102c047 > change-id: 20250306-topic-am62-ioddr-v2025-04-rc1-0b3a0ffe92b1 > > Best regards, > -- > Markus Schneider-Pargmann <m...@baylibre.com> >
