[PATCH 1/3] arm64: dts: imx8mn-tqma8mqnl: remove virtual 3.3V regulator

[PATCH 1/3] arm64: dts: imx8mn-tqma8mqnl: remove virtual 3.3V regulator

[Alexander Stein]

From: Markus Niebel <Markus.Niebel@ew.tq-group.com>

BUCK4 rail supplies the 3.3V rail. Use the actual regulator
instead of a virtual fixed regulator.

Signed-off-by: Markus Niebel <Markus.Niebel@ew.tq-group.com>
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
---
 arch/arm64/boot/dts/freescale/imx8mn-tqma8mqnl.dtsi | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mn-tqma8mqnl.dtsi b/arch/arm64/boot/dts/freescale/imx8mn-tqma8mqnl.dtsi
index 1d23814e11cd3..34d6415348f8c 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn-tqma8mqnl.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mn-tqma8mqnl.dtsi
@@ -23,13 +23,6 @@ reg_vcc1v8: regulator-vcc1v8 {
 		regulator-max-microvolt = <1800000>;
 	};
 
-	reg_vcc3v3: regulator-vcc3v3 {
-		compatible = "regulator-fixed";
-		regulator-name = "TQMA8MXNL_VCC3V3";
-		regulator-min-microvolt = <3300000>;
-		regulator-max-microvolt = <3300000>;
-	};
-
 	reserved-memory {
 		#address-cells = <2>;
 		#size-cells = <2>;
@@ -217,14 +210,14 @@ eeprom1: eeprom@53 {
 		read-only;
 		reg = <0x53>;
 		pagesize = <16>;
-		vcc-supply = <&reg_vcc3v3>;
+		vcc-supply = <&buck4_reg>;
 	};
 
 	eeprom0: eeprom@57 {
 		compatible = "atmel,24c64";
 		reg = <0x57>;
 		pagesize = <32>;
-		vcc-supply = <&reg_vcc3v3>;
+		vcc-supply = <&buck4_reg>;
 	};
 };
 
@@ -242,7 +235,7 @@ &usdhc3 {
 	non-removable;
 	no-sd;
 	no-sdio;
-	vmmc-supply = <&reg_vcc3v3>;
+	vmmc-supply = <&buck4_reg>;
 	vqmmc-supply = <&reg_vcc1v8>;
 	status = "okay";
 };
-- 
2.43.0

[PATCH 2/3] arm64: dts: imx8mn-tqma8mqnl: remove virtual 1.8V regulator

[Alexander Stein]

From: Markus Niebel <Markus.Niebel@ew.tq-group.com>

BUCK5 regulator supplies the 1.8V rail. Use the actual regulator
instead of a virtual fixed regulator.

Signed-off-by: Markus Niebel <Markus.Niebel@ew.tq-group.com>
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
---
 arch/arm64/boot/dts/freescale/imx8mn-tqma8mqnl.dtsi | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mn-tqma8mqnl.dtsi b/arch/arm64/boot/dts/freescale/imx8mn-tqma8mqnl.dtsi
index 34d6415348f8c..ac6ce5d814c50 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn-tqma8mqnl.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mn-tqma8mqnl.dtsi
@@ -15,14 +15,6 @@ memory@40000000 {
 		reg = <0x00000000 0x40000000 0 0x40000000>;
 	};
 
-	/* e-MMC IO, needed for HS modes */
-	reg_vcc1v8: regulator-vcc1v8 {
-		compatible = "regulator-fixed";
-		regulator-name = "TQMA8MXNL_VCC1V8";
-		regulator-min-microvolt = <1800000>;
-		regulator-max-microvolt = <1800000>;
-	};
-
 	reserved-memory {
 		#address-cells = <2>;
 		#size-cells = <2>;
@@ -236,7 +228,7 @@ &usdhc3 {
 	no-sd;
 	no-sdio;
 	vmmc-supply = <&buck4_reg>;
-	vqmmc-supply = <&reg_vcc1v8>;
+	vqmmc-supply = <&buck5_reg>;
 	status = "okay";
 };
 
-- 
2.43.0

[PATCH 3/3] arm64: dts: imx8mn-tqma8mqnl: fix LDO5 power off

[Alexander Stein]

From: Markus Niebel <Markus.Niebel@ew.tq-group.com>

Fix SD card removal caused by automatic LDO5 power off after boot

To prevent this, add vqmmc regulator for USDHC, using a GPIO-controlled
regulator that is supplied by LDO5. Since this is implemented on SoM but
used on baseboards with SD-card interface, implement the functionality
on SoM part and optionally enable it on baseboards if needed.

Signed-off-by: Markus Niebel <Markus.Niebel@ew.tq-group.com>
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
---
 .../dts/freescale/imx8mn-tqma8mqnl-mba8mx.dts | 13 ++++++-----
 .../boot/dts/freescale/imx8mn-tqma8mqnl.dtsi  | 22 +++++++++++++++++++
 2 files changed, 29 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mn-tqma8mqnl-mba8mx.dts b/arch/arm64/boot/dts/freescale/imx8mn-tqma8mqnl-mba8mx.dts
index d7f7f9aafb7d1..0d009f4be804e 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn-tqma8mqnl-mba8mx.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mn-tqma8mqnl-mba8mx.dts
@@ -69,6 +69,10 @@ &mipi_dsi {
 	samsung,esc-clock-frequency = <20000000>;
 };
 
+&reg_usdhc2_vqmmc {
+	status = "okay";
+};
+
 &sai3 {
 	assigned-clocks = <&clk IMX8MN_CLK_SAI3>;
 	assigned-clock-parents = <&clk IMX8MN_AUDIO_PLL1_OUT>;
@@ -216,8 +220,7 @@ pinctrl_usdhc2: usdhc2grp {
 			   <MX8MN_IOMUXC_SD2_DATA0_USDHC2_DATA0		0x1d4>,
 			   <MX8MN_IOMUXC_SD2_DATA1_USDHC2_DATA1		0x1d4>,
 			   <MX8MN_IOMUXC_SD2_DATA2_USDHC2_DATA2		0x1d4>,
-			   <MX8MN_IOMUXC_SD2_DATA3_USDHC2_DATA3		0x1d4>,
-			   <MX8MN_IOMUXC_GPIO1_IO04_USDHC2_VSELECT	0x84>;
+			   <MX8MN_IOMUXC_SD2_DATA3_USDHC2_DATA3		0x1d4>;
 	};
 
 	pinctrl_usdhc2_100mhz: usdhc2-100mhzgrp {
@@ -226,8 +229,7 @@ pinctrl_usdhc2_100mhz: usdhc2-100mhzgrp {
 			   <MX8MN_IOMUXC_SD2_DATA0_USDHC2_DATA0		0x1d4>,
 			   <MX8MN_IOMUXC_SD2_DATA1_USDHC2_DATA1		0x1d4>,
 			   <MX8MN_IOMUXC_SD2_DATA2_USDHC2_DATA2		0x1d4>,
-			   <MX8MN_IOMUXC_SD2_DATA3_USDHC2_DATA3		0x1d4>,
-			   <MX8MN_IOMUXC_GPIO1_IO04_USDHC2_VSELECT	0x84>;
+			   <MX8MN_IOMUXC_SD2_DATA3_USDHC2_DATA3		0x1d4>;
 	};
 
 	pinctrl_usdhc2_200mhz: usdhc2-200mhzgrp {
@@ -236,8 +238,7 @@ pinctrl_usdhc2_200mhz: usdhc2-200mhzgrp {
 			   <MX8MN_IOMUXC_SD2_DATA0_USDHC2_DATA0		0x1d4>,
 			   <MX8MN_IOMUXC_SD2_DATA1_USDHC2_DATA1		0x1d4>,
 			   <MX8MN_IOMUXC_SD2_DATA2_USDHC2_DATA2		0x1d4>,
-			   <MX8MN_IOMUXC_SD2_DATA3_USDHC2_DATA3		0x1d4>,
-			   <MX8MN_IOMUXC_GPIO1_IO04_USDHC2_VSELECT	0x84>;
+			   <MX8MN_IOMUXC_SD2_DATA3_USDHC2_DATA3		0x1d4>;
 	};
 
 	pinctrl_usdhc2_gpio: usdhc2-gpiogrp {
diff --git a/arch/arm64/boot/dts/freescale/imx8mn-tqma8mqnl.dtsi b/arch/arm64/boot/dts/freescale/imx8mn-tqma8mqnl.dtsi
index ac6ce5d814c50..31a3ca137e636 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn-tqma8mqnl.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mn-tqma8mqnl.dtsi
@@ -15,6 +15,20 @@ memory@40000000 {
 		reg = <0x00000000 0x40000000 0 0x40000000>;
 	};
 
+	reg_usdhc2_vqmmc: regulator-usdhc2-vqmmc {
+		compatible = "regulator-gpio";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_reg_usdhc2_vqmmc>;
+		regulator-name = "V_SD2";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <3300000>;
+		gpios = <&gpio1 4 GPIO_ACTIVE_HIGH>;
+		states = <1800000 0x1>,
+			 <3300000 0x0>;
+		vin-supply = <&ldo5_reg>;
+		status = "disabled";
+	};
+
 	reserved-memory {
 		#address-cells = <2>;
 		#size-cells = <2>;
@@ -218,6 +232,10 @@ &mipi_dsi {
 	vddio-supply = <&ldo3_reg>;
 };
 
+&usdhc2 {
+	vqmmc-supply = <&reg_usdhc2_vqmmc>;
+};
+
 &usdhc3 {
 	pinctrl-names = "default", "state_100mhz", "state_200mhz";
 	pinctrl-0 = <&pinctrl_usdhc3>;
@@ -272,6 +290,10 @@ pinctrl_reg_usdhc2_vmmc: regusdhc2vmmcgrp {
 		fsl,pins = <MX8MN_IOMUXC_SD2_RESET_B_GPIO2_IO19		0x84>;
 	};
 
+	pinctrl_reg_usdhc2_vqmmc: regusdhc2vqmmcgrp {
+		fsl,pins = <MX8MN_IOMUXC_GPIO1_IO04_GPIO1_IO4		0xc0>;
+	};
+
 	pinctrl_usdhc3: usdhc3grp {
 		fsl,pins = <MX8MN_IOMUXC_NAND_WE_B_USDHC3_CLK		0x1d4>,
 			   <MX8MN_IOMUXC_NAND_WP_B_USDHC3_CMD		0x1d2>,
-- 
2.43.0

Re: [PATCH 1/3] arm64: dts: imx8mn-tqma8mqnl: remove virtual 3.3V regulator

[Shawn Guo]

On Tue, Dec 16, 2025 at 02:39:23PM +0100, Alexander Stein wrote:
> From: Markus Niebel <Markus.Niebel@ew.tq-group.com>
> 
> BUCK4 rail supplies the 3.3V rail. Use the actual regulator
> instead of a virtual fixed regulator.
> 
> Signed-off-by: Markus Niebel <Markus.Niebel@ew.tq-group.com>
> Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>

Applied all, thanks!