ARM: dts: imx8m: increase off-on delay on the SD Vcc regulator

Some SD Card controller and power circuitry has increased capacitance,
which keeps the internal logic remains powered after regulator is switch
off. This is generally the case when card is switched to SD104 mode,
where a power cycle should be performed. In case if the card internal
logic remains powered, it causes a subsequent failure of mode
transition, effectively leading to failed enumeration.

Introduce a delay of 20 msec in order to provide a possibility for
internal card circuitry to drain voltages and perform a power cycle
correctly.

Similar fix is done in commit c49d0ac38a76 ("ARM: dts: rmobile: Increase
off-on delay on the SD Vcc regulator") targeted Renesas SOCs.

Signed-off-by: Andrey Zhizhikin <andrey.zhizhikin@leica-geosystems.com>
Cc: Stefano Babic <sbabic@denx.de>

6 files changed, 26 insertions, 0 deletions

diff --git a/arch/arm/dts/imx8mm-beacon-kit-u-boot.dtsi b/arch/arm/dts/imx8mm-beacon-kit-u-boot.dtsi
index fc1aebb2feb..6d80a529ae7 100644
--- a/arch/arm/dts/imx8mm-beacon-kit-u-boot.dtsi
+++ b/arch/arm/dts/imx8mm-beacon-kit-u-boot.dtsi
@@ -37,6 +37,10 @@
 	/delete-property/ assigned-clock-rates;
 };
 
+&reg_usdhc2_vmmc {
+	u-boot,off-on-delay-us = <20000>;
+};
+
 &fec1 {
 	phy-reset-gpios = <&gpio4 22 GPIO_ACTIVE_LOW>;
 };
diff --git a/arch/arm/dts/imx8mm-evk-u-boot.dtsi b/arch/arm/dts/imx8mm-evk-u-boot.dtsi
index b5c12105a9d..9f77d3c6ff1 100644
--- a/arch/arm/dts/imx8mm-evk-u-boot.dtsi
+++ b/arch/arm/dts/imx8mm-evk-u-boot.dtsi
@@ -46,6 +46,10 @@
 	u-boot,dm-spl;
 };
 
+&reg_usdhc2_vmmc {
+	u-boot,off-on-delay-us = <20000>;
+};
+
 &pinctrl_reg_usdhc2_vmmc {
 	u-boot,dm-spl;
 };
diff --git a/arch/arm/dts/imx8mn-ddr4-evk-u-boot.dtsi b/arch/arm/dts/imx8mn-ddr4-evk-u-boot.dtsi
index 4419679d4c6..98b0b9891be 100644
--- a/arch/arm/dts/imx8mn-ddr4-evk-u-boot.dtsi
+++ b/arch/arm/dts/imx8mn-ddr4-evk-u-boot.dtsi
@@ -47,6 +47,10 @@
 	u-boot,dm-spl;
 };
 
+&reg_usdhc2_vmmc {
+	u-boot,off-on-delay-us = <20000>;
+};
+
 &pinctrl_uart2 {
 	u-boot,dm-spl;
 };
diff --git a/arch/arm/dts/imx8mp-evk-u-boot.dtsi b/arch/arm/dts/imx8mp-evk-u-boot.dtsi
index 24a93ac2d69..2452e9175c4 100644
--- a/arch/arm/dts/imx8mp-evk-u-boot.dtsi
+++ b/arch/arm/dts/imx8mp-evk-u-boot.dtsi
@@ -49,6 +49,10 @@
 };
 
 &reg_usdhc2_vmmc {
+	u-boot,off-on-delay-us = <20000>;
+};
+
+&reg_usdhc2_vmmc {
 	u-boot,dm-spl;
 };
 
diff --git a/arch/arm/dts/imx8mq-evk-u-boot.dtsi b/arch/arm/dts/imx8mq-evk-u-boot.dtsi
new file mode 100644
index 00000000000..4712cf6a445
--- /dev/null
+++ b/arch/arm/dts/imx8mq-evk-u-boot.dtsi
@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+
+&reg_usdhc2_vmmc {
+	u-boot,off-on-delay-us = <20000>;
+};
diff --git a/arch/arm/dts/imx8mq-phanbell-u-boot.dtsi b/arch/arm/dts/imx8mq-phanbell-u-boot.dtsi
new file mode 100644
index 00000000000..4712cf6a445
--- /dev/null
+++ b/arch/arm/dts/imx8mq-phanbell-u-boot.dtsi
@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+
+&reg_usdhc2_vmmc {
+	u-boot,off-on-delay-us = <20000>;
+};