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imx: kontron-sl-mx8mm: Use the VSELECT signal to switch SD card IO voltage

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It turns out that it is not necessary to declare the VSELECT signal as
GPIO and let the PMIC driver set it to a fixed high level. This switches
the voltage between 3.3V and 1.8V by setting the PMIC register for LDO5
accordingly.

Instead we can do it like other boards already do and simply mux the
VSELECT signal of the USDHC interface to the pin. This makes sure that
the correct voltage is selected by setting the PMIC's SD_VSEL input
to high or low accordingly.

Reported-by: Heiko Thiery <heiko.thiery@gmail.com>
Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Reviewed-by: Heiko Thiery <heiko.thiery@gmail.com>
Reviewed-by: Fabio Estevam <festevam@denx.de>
This commit is contained in:
Frieder Schrempf 2022-08-24 15:59:16 +02:00 • committed by Stefano Babic
parent dfbdc69c5d
commit 8fd4c05cec
3 changed files with 3 additions and 7 deletions
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5
arch/arm/dts/imx8mm-kontron-bl-u-boot.dtsi
View file

@ -62,11 +62,6 @@
&pinctrl_pmic {
u-boot,dm-spl;
fsl,pins = <
MX8MM_IOMUXC_GPIO1_IO00_GPIO1_IO0 0x141
/* Disable Pullup for SD_VSEL */
MX8MM_IOMUXC_GPIO1_IO04_GPIO1_IO4 0x41
>;
};
&pinctrl_uart3 {

3
arch/arm/dts/imx8mm-kontron-bl.dts
View file

@ -321,6 +321,7 @@
MX8MM_IOMUXC_SD2_DATA2_USDHC2_DATA2 0x1d0
MX8MM_IOMUXC_SD2_DATA3_USDHC2_DATA3 0x1d0
MX8MM_IOMUXC_SD2_CD_B_GPIO2_IO12 0x019
MX8MM_IOMUXC_GPIO1_IO04_USDHC2_VSELECT 0x1d0
>;
};
@ -333,6 +334,7 @@
MX8MM_IOMUXC_SD2_DATA2_USDHC2_DATA2 0x1d4
MX8MM_IOMUXC_SD2_DATA3_USDHC2_DATA3 0x1d4
MX8MM_IOMUXC_SD2_CD_B_GPIO2_IO12 0x019
MX8MM_IOMUXC_GPIO1_IO04_USDHC2_VSELECT 0x1d0
>;
};
@ -345,6 +347,7 @@
MX8MM_IOMUXC_SD2_DATA2_USDHC2_DATA2 0x1d6
MX8MM_IOMUXC_SD2_DATA3_USDHC2_DATA3 0x1d6
MX8MM_IOMUXC_SD2_CD_B_GPIO2_IO12 0x019
MX8MM_IOMUXC_GPIO1_IO04_USDHC2_VSELECT 0x1d0
>;
};
};

2
arch/arm/dts/imx8mm-kontron-sl.dtsi
View file

@ -103,7 +103,6 @@
pinctrl-0 = <&pinctrl_pmic>;
interrupt-parent = <&gpio1>;
interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
sd-vsel-gpios = <&gpio1 4 GPIO_ACTIVE_HIGH>;
regulators {
reg_vdd_soc: BUCK1 {
@ -246,7 +245,6 @@
pinctrl_pmic: pmicgrp {
fsl,pins = <
MX8MM_IOMUXC_GPIO1_IO00_GPIO1_IO0 0x141
MX8MM_IOMUXC_GPIO1_IO04_GPIO1_IO4 0x141
>;
};