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krzk+dt@kernel.org; conor+dt@kernel.org; > > shawnguo@kernel.org; Frank Li ; > > s.hauer@pengutronix.de; festevam@gmail.com; kernel@pengutronix.de; > > devicetree@vger.kernel.org; imx@lists.linux.dev; > > linux-arm-kernel@lists.infradead.org; linux-kernel@vger.kernel.org > > Subject: Re: [PATCH v1 1/7] arm64: dts: imx8dxl-evk: Add vpcie3v3aux > > regulator for PCIe M.2 connector > > > > 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 > > > --- > > > 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 = <®_pcieb>; > > > + vpcie3v3aux-supply = <®_pcieb>; > > > > Is it a documented binding? > Yes, it is. Please refer to what's Rob said below. > > " > It is standard because PCIe spec defines them. pci-bus-common.yaml already defines these: > > vpcie12v-supply: > description: 12v regulator phandle for the slot > > vpcie3v3-supply: > description: 3.3v regulator phandle for the slot > > vpcie3v3aux-supply: > description: 3.3v AUX regulator phandle for the slot > > Note that these should really be defined in the root port node rather than the host bridge node. We've done the latter because the RP node is often not defined. > > Rob > " Shawn: Check https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/pci/pci-bus-common.yaml Frank > > Best Regards > Richard Zhu > > > > Shawn > > > > > status = "okay"; > > > }; > > > > > > -- > > > 2.37.1 > > > >