[PATCH v4 0/4] Add support ANS2 NVMe on Apple A11

[Nick Chan <towinchenmi@gmail.com>]

Apple A11 SoC comes with an NVMe controller that is similar to the
NVMe controller in M1, but less customized. Notably, it does not
have NVMMU or Linear SQ.

The controller is wired to an older variant of the SART address filter,
and uses an older variant of ASC mailbox, so add support for them too.

This variant of mailbox is also present on Apple T2 SoC.

This series has everything required to support NVMe on Apple A11 SoC.
However, due to RTKit protocol version support limitation, it will
only work when booted with at least iOS 14 iBoot.

Tested on A11 as well as M1 Pro (to make sure nothing broke).

Patch 1-2 adds support for the older mailbox
Patch 3-5 adds support for the older SART
Patch 6-7 adds support for the NVMe controller found in Apple A11 SoC
Patch 8-9 adds the required device tree nodes.

Signed-off-by: Nick Chan <towinchenmi@gmail.com>
---
Changes in v4:
- Remove the remaining added long line in drivers/nvme/host/apple.c
- Drop already applied SART and mailbox patches (based on top of
  apple-soc/drivers-6.18)
- Link to v3: https://lore.kernel.org/r/20250821-t8015-nvme-v3-0-14a4178adf68@gmail.com

Changes in v3:
- Update comment about enabling NVMMU and Linear submission queues. It is
  required since T6000 and much of the comment has been removed as it was
  stating the T8015 (A11) code path as a possible alternative.
- Make sure all the code changes are within 80 columns
- Simplify apple_nvme_submit_cmd_t8015()
- Remove unnecessary cast of of_device_get_match_data()
- Use direct function calls for command submission
- Use existing enum in apple,sart binding when adding the "apple,t8015-sart"
  compatible.
- Link to v2: https://lore.kernel.org/r/20250818-t8015-nvme-v2-0-65648cd189e0@gmail.com

Changes in v2:
- Remove bogus command_id decrement followed by increment in apple_nvme_handle_cqe()
- Split apple_nvme_submit_cmd() into two functions for t8015 and t8103 since these
  two code paths were not sharing much code.
- Link to v1: https://lore.kernel.org/r/20250811-t8015-nvme-v1-0-ef9c200e74a7@gmail.com

---
Nick Chan (4):
      dt-bindings: nvme: apple,nvme-ans: Add Apple A11
      nvme: apple: Add Apple A11 support
      arm64: dts: apple: t8015: Fix PCIE power domains dependencies
      arm64: dts: apple: t8015: Add NVMe nodes

 .../devicetree/bindings/nvme/apple,nvme-ans.yaml   |  15 +-
 arch/arm64/boot/dts/apple/t8015-pmgr.dtsi          |   1 +
 arch/arm64/boot/dts/apple/t8015.dtsi               |  34 ++++
 drivers/nvme/host/apple.c                          | 197 ++++++++++++++-------
 4 files changed, 181 insertions(+), 66 deletions(-)
---
base-commit: 58b28ca2e6697d7c4b2c31d9d6dc1f71cd356553
change-id: 20250808-t8015-nvme-73a4fcda25dd

Best regards,
-- 
Nick Chan <towinchenmi@gmail.com>