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>

diff --git a/arch/arm/dts/imx8mm-beacon-kit-u-boot.dtsi b/arch/arm/dts/imx8mm-beacon-kit-u-boot.dtsi
index fc1aebb2febf1832d1f9f515a229481080f68282..6d80a529ae7de58d2e541f3290d8006619bd5a2d 100644 (file)
--- 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 b5c12105a9d103d40c4237c9a1c60cc3dc1c8af5..9f77d3c6ff1bcae6d83e7d58f8d6671fc3da44f2 100644 (file)
--- 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 4419679d4c66907054fb840b9456c68fdbe75c88..98b0b9891bedd616ce399e52d3cfd295f1559e28 100644 (file)
--- 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 24a93ac2d6906abe5ae71a5eaa655a3e303519be..2452e9175c4a583941dde9f9b28c433c727a7dbb 100644 (file)
--- a/arch/arm/dts/imx8mp-evk-u-boot.dtsi
+++ b/arch/arm/dts/imx8mp-evk-u-boot.dtsi
@@ -48,6 +48,10 @@
        u-boot,dm-spl;
 };
 
+&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 (file)
index 0000000..4712cf6
--- /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 (file)
index 0000000..4712cf6
--- /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>;
+};