[joske]

The M4 Max laptops describe only the Wi-Fi port of their PCIe controller, so nothing sits behind the SD slot's root port (00:01.0).

Their ADTs have the M4 Pro's reader. I read the J614c's from the running machine and the J616c's from its 26.6.2 dump:

• apcie0/pci-bridge1, with PERST on GPIO 5 and CLKREQ on GPIO 1;
• a pcie-sdreader powered by the SMC's gP19 output;
• the controller's second interrupt, 1732;
• dart-apcie1 at 0x211000000, interrupt 1733.

This describes it the same way the M4 Pro boards do:

• port 1 with the GL9755 (pci17a0,9755) and its supply;
• the CLKREQ pin;
• the second interrupt;
• the reader's DART. t6040.dtsi defines that DART only for T6040, so it goes in the M4 Max boards' dtsi.

Tested on the J614c:

• The GL9755 enumerates at 02:00.0, and sdhci-pci registers mmc0 with ADMA 64-bit.
• An inserted 128 GB SDXC card is detected at UHS-I SDR104 and shows up as mmcblk0 with its partition. So card detect works with cd-inverted, as on the M4 Pro.

Not tested on the J616c.

🤖 Generated with Claude Code

[DjDeveloperr]

No blocking source-review findings. Port 1's reset/enable GPIOs, CLKREQ pin, GL9755 IDs, bus ranges, IOMMU stream mapping, second PCIe interrupt, and inverted CD/WP properties match the existing M4 Pro reader description. The new DART matches the existing T6040 node's physical address 0x411000000, span 0x20000, and IRQ1733; T6041 does not include that T6040-specific node, so defining it here avoids duplication. The PR body quotes an ADT address 0x211000000 while the DT reg uses 0x411000000; the latter agrees with the established SoC description and author's successful J614c enumeration, so this appears to be a description/address-space typo rather than a code defect. J616c is still untested, and the stated SD test establishes enumeration/card detection rather than write/throughput qualification. Merge should wait for exact-head host-tests and DT checks.

Resolved the shared DTS insertion conflicts by merging current integration and the preceding reviewed PRs into this branch, preserving the original contributor commits and all earlier merged changes. Each original patch hunk matched uniquely; the incremental changes are the original PR changes (plus removal of an empty line left at EOF by the camera move). Updated-head CI must pass before merge. Merge this series in order: #1459, #1463, #1464, #1465. No image build or hardware change was started.