Re: [PATCH v2 3/3] arm64: dts: apple: t600x: Add PCIe pwren gpios

[Janne Grunau]

On Wed, Nov 04, 2026 at 12:40:31PM +0100, Yureka Lilian wrote:
> For the MacBook Pro and Mac Studio devices using the M1 Pro/Max/Ultra
> SoCs, add the appropriate fixed regulators for enabling the peripherals
> connected to the PCIe ports (WiFi, SD card reader and USB xHCI), which
> are controlled by GPIOs connected to the SMC.
> Set the regulators as the power-supply of the respective PCIe port, so
> that the endpoints are powered on before probing the ports.
> 
> Add the 'pciclass,0604' compatible string to the PCIe bridge nodes in
> the SoC to allow the pci-pwrctrl-generic driver to bind to them.
> 
> Signed-off-by: Yureka Lilian <yureka@xxxxxxxxxxxxxx>
> ---
>  arch/arm64/boot/dts/apple/t600x-die0.dtsi      |  4 ++++
>  arch/arm64/boot/dts/apple/t600x-j314-j316.dtsi | 16 +++++++++++++++
>  arch/arm64/boot/dts/apple/t600x-j375.dtsi      | 27 ++++++++++++++++++++++++++
>  3 files changed, 47 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/apple/t600x-die0.dtsi b/arch/arm64/boot/dts/apple/t600x-die0.dtsi
> index 122a566e75d1..635635c4bfbd 100644
> --- a/arch/arm64/boot/dts/apple/t600x-die0.dtsi
> +++ b/arch/arm64/boot/dts/apple/t600x-die0.dtsi
> @@ -460,6 +460,7 @@ pcie0: pcie@590000000 {
>  		pinctrl-names = "default";
>  
>  		port00: pci@0,0 {
> +			compatible = "pciclass,0604";
>  			device_type = "pci";

`dt-check-style --mode strict` wants "device_type" before "compatible"

> diff --git a/arch/arm64/boot/dts/apple/t600x-j314-j316.dtsi b/arch/arm64/boot/dts/apple/t600x-j314-j316.dtsi
> index caded1636f3d..4f9dccf839ad 100644
> --- a/arch/arm64/boot/dts/apple/t600x-j314-j316.dtsi
> +++ b/arch/arm64/boot/dts/apple/t600x-j314-j316.dtsi
> @@ -55,6 +55,20 @@ led-0 {
>  			default-state = "keep";
>  		};
>  	};
> +
> +	vreg_pcie0_port0: regulator-pcie0-port0 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "pwren-pcie0-port0";
> +		gpio = <&smc_gpio 13 GPIO_ACTIVE_HIGH>;
> +		enable-active-high;
> +	};
> +
> +	vreg_pcie0_port1: regulator-pcie0-port1 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "pwren-pcie0-port1";
> +		gpio = <&smc_gpio 26 GPIO_ACTIVE_HIGH>;

Please do the t602x changes in the same commit. This file is included by
t602x-j414-j416.dtsi and the M2 Pro/Max devices use different gpio pins.
If they aren't overriden in the same commit this will toggled a random
GPIO pin on M2 Pro/Max Macbook Pros.

> diff --git a/arch/arm64/boot/dts/apple/t600x-j375.dtsi b/arch/arm64/boot/dts/apple/t600x-j375.dtsi
> index 8a1494949e4c..412b2fe109be 100644
> --- a/arch/arm64/boot/dts/apple/t600x-j375.dtsi
> +++ b/arch/arm64/boot/dts/apple/t600x-j375.dtsi
> @@ -42,6 +42,30 @@ memory@10000000000 {
>  		device_type = "memory";
>  		reg = <0x100 0 0x2 0>; /* To be filled by loader */
>  	};
> +
> +	/* WLAN/BT */
> +	vreg_pcie0_port0: regulator-pcie0-port0 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "pwren-pcie0-port0";
> +		gpio = <&smc_gpio 13 GPIO_ACTIVE_HIGH>;
> +		enable-active-high;
> +	};
> +
> +	/* SD card reader */

this is included indirectly on t6020-j474.dts which doesn't have a card
reader.

> +	vreg_pcie0_port1: regulator-pcie0-port1 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "pwren-pcie0-port1";
> +		gpio = <&smc_gpio 26 GPIO_ACTIVE_HIGH>;

Same comment about the GPIO pins as for the Macbook Pros.

I'm not sure if the cross-SoC generation device .dtsi files were a good
idea even though the devices are very similar. I probably wouldn't
repeat that but I don't think it's worth to untangle at this point.

Janne