Re: [PATCH v6 16/16] arm64: dts: mediatek: mt8188-geralt: Add WiFi/BT as M.2 E-key slot

[Bartosz Golaszewski]

On Tue, 21 Jul 2026 08:54:11 +0200, Chen-Yu Tsai <wenst@xxxxxxxxxxxx> said:
> The MT8188 Geralt design features a chip-on-board WiFi/BT solution. This
> is a M.2 E-key WiFi/BT board layout directly inserted into the mainboard
> design. The connections to the rest of the board are almost the same as
> if it were a separate M.2 card. The only addition is the PMU_EN pin on
> the chip; on M.2 cards this would be tied to the primary power source.
>
> Model the chip-on-board WiFi/BT solution as a M.2 E-key slot with PCIe,
> USB and auxiliary signals. The PMU_EN pin, which enables the internal
> power controls and regulators, is modeled as a regulator fed by the
> pp3300_wlan regulator. Since power sequencing is now correctly modeled
> using the M.2 E-key slot, drop the "regulator-always-on" property one
> pp3300_wlan regulator. Also drop the comment in xhci2 saying "MT7921's
> power is controlled by PCIe".
>
> Also drop the voltage range on the pp3300_wlan regulator. This
> "regulator" is just a load switch and does not provide any regulation.
>
> Signed-off-by: Chen-Yu Tsai <wenst@xxxxxxxxxxxx>
> ---

Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxxxxxxxx>