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

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

[Francesco Dolcini]

From: Francesco Dolcini <francesco.dolcini@toradex.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@vger.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@toradex.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

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

[Frank Li]

On Mon, Jun 23, 2025 at 03:25:45PM +0200, Francesco Dolcini wrote:
> From: Francesco Dolcini <francesco.dolcini@toradex.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@vger.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@toradex.com>

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

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

[Shawn Guo]

On Mon, Jun 23, 2025 at 03:25:45PM +0200, Francesco Dolcini wrote:
> From: Francesco Dolcini <francesco.dolcini@toradex.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@vger.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@toradex.com>

Applied, thanks!