linux-kernel - Re: [PATCH v1 0/7] Add vpcie3v3aux regulator for i.MX PCIe M.2 connector

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Message-ID: <aPuE94zh+381yeMm@lizhi-Precision-Tower-5810>
Date: Fri, 24 Oct 2025 09:53:59 -0400
From: Frank Li <Frank.li@....com>
To: Richard Zhu <hongxing.zhu@....com>
Cc: robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
	shawnguo@...nel.org, s.hauer@...gutronix.de, festevam@...il.com,
	kernel@...gutronix.de, devicetree@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 0/7] Add vpcie3v3aux regulator for i.MX PCIe M.2
 connector

On Fri, Oct 24, 2025 at 03:31:45PM +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.
>
> But the current vpcie regulator may be gated off during system suspend. To
> avoid the DT back-compatibility break, add vpcie3v3aux regulator to let this
> 3.3 V power source always on for PCIe M.2 Key E connector on the boards.
>
> [PATCH v1 1/7] arm64: dts: imx8dxl-evk: Add vpcie3v3aux regulator for
> [PATCH v1 2/7] arm64: dts: imx8mp-evk: Add vpcie3v3aux regulator for
> [PATCH v1 3/7] arm64: dts: imx8mq-evk: Add vpcie3v3aux regulator for
> [PATCH v1 4/7] arm64: dts: imx8qm-mek: Add vpcie3v3aux regulator for
> [PATCH v1 5/7] arm64: dts: imx8qxp-mek: Add vpcie3v3aux regulator for
> [PATCH v1 6/7] arm64: dts: imx95-15x15-evk: Add vpcie3v3aux regulator
> [PATCH v1 7/7] arm64: dts: imx95-19x19-evk: Add vpcie3v3aux regulator

For all patches

Reviewed-by: Frank Li <Frank.Li@....com>

>
> arch/arm64/boot/dts/freescale/imx8dxl-evk.dts     | 1 +
> arch/arm64/boot/dts/freescale/imx8mp-evk.dts      | 1 +
> arch/arm64/boot/dts/freescale/imx8mq-evk.dts      | 1 +
> arch/arm64/boot/dts/freescale/imx8qm-mek.dts      | 1 +
> arch/arm64/boot/dts/freescale/imx8qxp-mek.dts     | 1 +
> arch/arm64/boot/dts/freescale/imx95-15x15-evk.dts | 1 +
> arch/arm64/boot/dts/freescale/imx95-19x19-evk.dts | 2 ++
> 7 files changed, 8 insertions(+)
>
>