[PATCH v3 00/22] am62: IO+DDR resume support

[Markus Schneider-Pargmann]

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.

Afterward 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 devicetree
repository tag v6.16-rc1-dts and are required to find the correct
address of the metadata. I picked some additional patches to avoid
conflicts.

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.

This series is based on next.

I tested this on am62a.

Best,
Markus

Signed-off-by: Markus Schneider-Pargmann <msp at baylibre.com>
---
Changes in v3:
- Use wait_for_bit helpers in k3-ddrss where possible and add panic
  messages for easier debugging
- Link to v2: https://lore.kernel.org/r/20250613-topic-am62-ioddr-v2025-04-rc1-v2-0-3d233aaea355@baylibre.com

Changes in v2:
- Remove 'default n' from K3_IODDR
- Pick devicetree patches from upstream instead of mailinglist
- Link to v1: https://lore.kernel.org/r/20250311-topic-am62-ioddr-v2025-04-rc1-v1-0-666de9c105cb@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

Judith Mendez (3):
      arm64: dts: ti: k3-am62a7-sk: Enable PWM
      arm64: dts: ti: k3-am6*: Add boot phase flag to support MMC boot
      arm64: dts: ti: k3-am6*: Remove disable-wp for eMMC

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                           |   8 +
 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                    | 177 +++++++++++++++++++++
 dts/upstream/src/arm64/ti/k3-am62-lp-sk.dts        |  12 ++
 dts/upstream/src/arm64/ti/k3-am62-phycore-som.dtsi |   1 -
 dts/upstream/src/arm64/ti/k3-am625-beagleplay.dts  |   1 -
 dts/upstream/src/arm64/ti/k3-am62a-main.dtsi       |  12 ++
 dts/upstream/src/arm64/ti/k3-am62a-mcu.dtsi        |  25 +++
 .../src/arm64/ti/k3-am62a-phycore-som.dtsi         |   1 -
 dts/upstream/src/arm64/ti/k3-am62a-wakeup.dtsi     |  25 +++
 dts/upstream/src/arm64/ti/k3-am62a7-sk.dts         | 139 +++++++++++++++-
 dts/upstream/src/arm64/ti/k3-am62p5-sk.dts         |  51 +++++-
 dts/upstream/src/arm64/ti/k3-am62x-sk-common.dtsi  |  35 +++-
 dts/upstream/src/arm64/ti/k3-am642-evm.dts         |   1 -
 dts/upstream/src/arm64/ti/k3-am654-base-board.dts  |   1 -
 .../ti/k3-am6548-iot2050-advanced-common.dtsi      |   1 -
 dts/upstream/src/arm64/ti/k3-am69-sk.dts           |   1 -
 include/linux/soc/ti/ti_sci_protocol.h             |   9 ++
 29 files changed, 786 insertions(+), 27 deletions(-)
---
base-commit: dbf7fd557a73ded3141db3c2cf5c572989378825
change-id: 20250306-topic-am62-ioddr-v2025-04-rc1-0b3a0ffe92b1

Best regards,
-- 
Markus Schneider-Pargmann <msp at baylibre.com>