[PATCH v2 0/6] MSM8916: Bring secondary cores online with spin-table

[Sam Day via B4 Relay]

This patch series depends on the "mach-snapdragon: handle platforms
without PSCI support" patch that was submitted earlier today. That first
patch lays some groundwork to handle detecting when a device is booting
without PSCI and deletes the /psci node in that case.

This series builds on top of that detection by rewriting all CPUs with
enable-method="psci" to "spin-table".

Once this is done, the existing spin-table support in U-Boot handles
further patching the nodes with the appropriate cpu-release-addr and
reserving the memory with the spin-table instructions.

Interestingly, this spin-table code doesn't seem to be in active use
anywhere, and it had bitrotted a little. But after blowing the dust off
it and fixing a couple of missing #includes, it works great.

I extended the spin-table support a little to make it easier for
consumers to plug in a method that is called for each CPU that needs to
be brought online. This saves the qcom board code from needing to hook
into ft_board_setup or something that runs before booting the OS.

Signed-off-by: Sam Day <me at samcday.com>
---
Changes in v2:
- Reworked the SCM impl to be a proper firmware driver, and streamlined
  the API so callers aren't forced to deal with calling conventions
  (thanks Casey).
- Link to v1: https://lore.kernel.org/r/20250128-msm8916-smp-support-v1-0-39587f18cf0c@samcday.com

---
Sam Day (6):
      armv8: spin_table: Fix missing includes
      armv8: spin_table: add hook for booting cores
      firmware: Add qcom SCM driver
      mach-snapdragon: fixup CPUs with PSCI enable-method
      mach-snapdragon: MSM8916 spin-table CPU boot support
      qcom_defconfig: enable spin-table support

 MAINTAINERS                            |   2 +
 arch/arm/cpu/armv8/spin_table.c        |  20 +++
 arch/arm/include/asm/spin_table.h      |   3 +
 arch/arm/mach-snapdragon/Makefile      |   1 +
 arch/arm/mach-snapdragon/board.c       |  41 +++++
 arch/arm/mach-snapdragon/msm8916-smp.c | 138 +++++++++++++++++
 configs/qcom_defconfig                 |   3 +
 drivers/firmware/Kconfig               |   9 ++
 drivers/firmware/Makefile              |   1 +
 drivers/firmware/qcom-scm.c            | 274 +++++++++++++++++++++++++++++++++
 include/firmware/qcom/scm.h            |  71 +++++++++
 11 files changed, 563 insertions(+)
---
base-commit: 30b77f6aa146c96b831cb4ece038130b655b6a41
change-id: 20250127-msm8916-smp-support-5f5e7b49d07e

Best regards,
-- 
Sam Day <me at samcday.com>