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

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>

diff --git a/arch/arm/dts/imx8mm-kontron-bl-u-boot.dtsi b/arch/arm/dts/imx8mm-kontron-bl-u-boot.dtsi
index 2c62f05..a42881d 100644 (file)
--- a/arch/arm/dts/imx8mm-kontron-bl-u-boot.dtsi
+++ b/arch/arm/dts/imx8mm-kontron-bl-u-boot.dtsi
@@ -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 {

diff --git a/arch/arm/dts/imx8mm-kontron-bl.dts b/arch/arm/dts/imx8mm-kontron-bl.dts
index ca533ba..a079322 100644 (file)
--- a/arch/arm/dts/imx8mm-kontron-bl.dts
+++ b/arch/arm/dts/imx8mm-kontron-bl.dts
@@ -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
                >;
        };
 };

diff --git a/arch/arm/dts/imx8mm-kontron-sl.dtsi b/arch/arm/dts/imx8mm-kontron-sl.dtsi
index 11a50cf..7cfa747 100644 (file)
--- a/arch/arm/dts/imx8mm-kontron-sl.dtsi
+++ b/arch/arm/dts/imx8mm-kontron-sl.dtsi
@@ -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
                >;
        };