[PATCH v3 9/9] arm64: dts: apple: Add minimal t8132 (M4) device trees

[Linus Walleij]

On Tue, Aug 11, 2026 at 9:37 PM Yureka Lilian <yureka at cyberchaos.dev> wrote:

> Added device trees for the following devices:
> - apple,j604 - MacBook Pro (14-inch, M4, 2024)
> - apple,j623 - iMac (24-inch, 2x USB-C, M4, 2024)
> - apple,j624 - iMac (24-inch, 4x USB-C, M4, 2024)
> - apple,j713 - MacBook Air (13-inch, M4, 2025)
> - apple,j715 - MacBook Air (15-inch, M4, 2025)
> - apple,j773g - Mac mini (M4, 2024)
>
> The device trees have a minimal set of devices limited to CPU cores,
> interrupt controller, power states, watchdog, serial, pin controller,
> i2c and framebuffer.
> The device trees for the notebooks add a PWM controller for the keyboard
> LED illumination.
>
> Using the macOS 26.6 iBoot/firmware, the Mac mini reliably boots on a
> single core using the stock kernel.
> Booting with smp requires avoiding the wfi and wfit instructions
> in the idle loop and `delay()` respectively, since those instructions
> cause a loss of architectural state on the secondary cores, and even
> then boot is unreliable.
>
> Signed-off-by: Yureka Lilian <yureka at cyberchaos.dev>

Reviewed-by: Linus Walleij <linusw at kernel.org>

Yours,
Linus Walleij