Re: [PATCH v1 1/7] arm64: dts: imx8dxl-evk: Add vpcie3v3aux regulator for PCIe M.2 connector

[Shawn Guo <shawnguo2@yeah.net>]

On Fri, Oct 24, 2025 at 03:31:46PM +0800, Richard Zhu wrote:
> Refer to PCI Express M.2 Specification r5.1 sec3.1.1 Power Sources and
> Grounds.
> 
> PCI Express M.2 Socket 1 utilizes a 3.3 V power source. The voltage
> source, 3.3 V, is expected to be available during the system’s
> stand-by/suspend state to support wake event processing on the
> communications card.
> 
> Add vpcie3v3aux regulator to let this 3.3 V power source always on for
> PCIe M.2 Key E connector on i.MX8DXL EVK board.
> 
> Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
> ---
>  arch/arm64/boot/dts/freescale/imx8dxl-evk.dts | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8dxl-evk.dts b/arch/arm64/boot/dts/freescale/imx8dxl-evk.dts
> index 25a77cac6f0b5..7704dba9e37c0 100644
> --- a/arch/arm64/boot/dts/freescale/imx8dxl-evk.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8dxl-evk.dts
> @@ -649,6 +649,7 @@ &pcie0 {
>  	pinctrl-names = "default";
>  	reset-gpio = <&lsio_gpio4 0 GPIO_ACTIVE_LOW>;
>  	vpcie-supply = <&reg_pcieb>;
> +	vpcie3v3aux-supply = <&reg_pcieb>;

Is it a documented binding?

Shawn

>  	status = "okay";
>  };
>  
> -- 
> 2.37.1
>