[PATCH v2 0/8] Suspend to RAM support for K3 J7200

[Thomas Richard <thomas.richard@bootlin.com>]

This series is the U-Boot part of the work to add the suspend to RAM
support for the K3 J7200 EVM board.

During the boot R5 SPL makes a copy of DM-Firmware in memory.
Resume detection is done by reading a magic value in a pmic register
(set by DM-Firmware).

If a resume is detected, R5 SPL run the exit retention sequence of the
DDR. Then it restores TF-A in SRAM (it saved itself to DDR), and load
DM-Firmware using the copy done during the boot (fit image processing
is skipped).

The copy of TF-A/DM-Firmware, the SPL stack and malloc are located in a
reserved memory region (for the kernel point of view) to avoid any
memory corruption.

Changes in v2:
- Set exit retention code for DDR behind CONFIG_K3_J721E_DDRSS
- Check if TF-A is running in DRAM, if yes no need to restore it
- Remove BL31_START macro, and get TF-A start address from the fit image
- Remove the test_enter_suspend command
- Link to v1: https://lore.kernel.org/u-boot/20231016141135.325698-1-thomas.richard@bootlin.com/

Gowtham Tammana (1):
  DO NOT MERGE: arm: dts: k3-j7200-r5-common: Add pmic node for esm

Gregory CLEMENT (2):
  configs: j7200_evm_r5: Used reserved memory in DDR for stack
  configs: j7200_evm_r5: Move address used for allocation in the
    reserved space

Thomas Richard (5):
  board: ti: j721e: Add resume detection for J7200
  ram: k3-ddrss: Add exit retention support
  board: ti: j721e: Add the missing part of exit retention for k3-ddrss
    (J7200)
  board: ti: j721e: During resume spl restores TF-A and DM-Firmware
  arm: mach-k3: j7200: Skip fit processing when resuming

 .../arm/dts/k3-j7200-r5-common-proc-board.dts |  17 +-
 arch/arm/mach-k3/common.c                     |  48 ++-
 arch/arm/mach-k3/include/mach/j721e_spl.h     |  28 ++
 arch/arm/mach-k3/sysfw-loader.c               |  16 +-
 board/ti/j721e/evm.c                          |  79 +++++
 configs/j7200_evm_r5_defconfig                |   4 +-
 drivers/ram/k3-ddrss/k3-ddrss.c               | 307 ++++++++++++++++++
 7 files changed, 489 insertions(+), 10 deletions(-)

-- 
2.39.2