linux-kernel - Re: [PATCH v1] arm64: dts: freescale: imx8mm-verdin: Keep LDO5 always on

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Message-ID: <aFlvOshtO8WcbcBV@lizhi-Precision-Tower-5810>
Date: Mon, 23 Jun 2025 11:14:02 -0400
From: Frank Li <Frank.li@....com>
To: Francesco Dolcini <francesco@...cini.it>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Francesco Dolcini <francesco.dolcini@...adex.com>,
	devicetree@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH v1] arm64: dts: freescale: imx8mm-verdin: Keep LDO5
 always on

On Mon, Jun 23, 2025 at 03:25:45PM +0200, Francesco Dolcini wrote:
> From: Francesco Dolcini <francesco.dolcini@...adex.com>
>
> LDO5 regulator is used to power the i.MX8MM NVCC_SD2 I/O supply, that is
> used for the SD2 card interface and also for some GPIOs.
>
> When the SD card interface is not enabled the regulator subsystem could
> turn off this supply, since it is not used anywhere else, however this
> will also remove the power to some other GPIOs, for example one I/O that
> is used to power the ethernet phy, leading to a non working ethernet
> interface.
>
> [   31.820515] On-module +V3.3_1.8_SD (LDO5): disabling
> [   31.821761] PMIC_USDHC_VSELECT: disabling
> [   32.764949] fec 30be0000.ethernet end0: Link is Down
>
> Fix this keeping the LDO5 supply always on.
>
> Cc: stable@...r.kernel.org
> Fixes: 6a57f224f734 ("arm64: dts: freescale: add initial support for verdin imx8m mini")
> Fixes: f5aab0438ef1 ("regulator: pca9450: Fix enable register for LDO5")
> Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>

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

> ---
>  arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi
> index d29710772569..1594ce9182a5 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi
> @@ -464,6 +464,7 @@ reg_vdd_phy: LDO4 {
>  			};
>
>  			reg_nvcc_sd: LDO5 {
> +				regulator-always-on;
>  				regulator-max-microvolt = <3300000>;
>  				regulator-min-microvolt = <1800000>;
>  				regulator-name = "On-module +V3.3_1.8_SD (LDO5)";
> --
> 2.39.5
>