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arm64: dts: imx8mp-var-som: Fix LDO5 shutdown causing SD card timeout

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[ Upstream commit c6888983134e2ccc2db8ffd2720b0d4826d952e4 ]

Fix SD card timeout issue caused by LDO5 regulator getting disabled
after boot.

The kernel log shows LDO5 being disabled, which leads to a timeout
on USDHC2:
[   33.760561] LDO5: disabling
[   81.119861] mmc1: Timeout waiting for hardware interrupt.

To prevent this, set regulator-boot-on and regulator-always-on for
LDO5. Also add the vqmmc regulator to properly support 1.8V/3.3V
signaling for USDHC2 using a GPIO-controlled regulator.

Fixes: 6c2a1f4f71 ("arm64: dts: imx8mp-var-som-symphony: Add Variscite Symphony board and VAR-SOM-MX8MP SoM")
Signed-off-by: Himanshu Bhavani <himanshu.bhavani@siliconsignals.io>
Acked-by: Tarang Raval <tarang.raval@siliconsignals.io>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Himanshu Bhavani
2025-05-05 11:28:27 +05:30
committed by Greg Kroah-Hartman
parent 48fff1267e
commit 220444d209
1 changed files with 11 additions and 1 deletions
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12
arch/arm64/boot/dts/freescale/imx8mp-var-som.dtsi
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@@ -35,7 +35,6 @@
<0x1 0x00000000 0 0xc0000000>;
};
reg_usdhc2_vmmc: regulator-usdhc2-vmmc {
compatible = "regulator-fixed";
regulator-name = "VSD_3V3";
@@ -46,6 +45,16 @@
startup-delay-us = <100>;
off-on-delay-us = <12000>;
};
reg_usdhc2_vqmmc: regulator-usdhc2-vqmmc {
compatible = "regulator-gpio";
regulator-name = "VSD_VSEL";
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <3300000>;
gpios = <&gpio2 12 GPIO_ACTIVE_HIGH>;
states = <3300000 0x0 1800000 0x1>;
vin-supply = <&ldo5>;
};
};
&A53_0 {
@@ -205,6 +214,7 @@
pinctrl-2 = <&pinctrl_usdhc2_200mhz>, <&pinctrl_usdhc2_gpio>;
cd-gpios = <&gpio1 14 GPIO_ACTIVE_LOW>;
vmmc-supply = <&reg_usdhc2_vmmc>;
vqmmc-supply = <&reg_usdhc2_vqmmc>;
bus-width = <4>;
status = "okay";
};