Pins GPIO1_IO17 and GPIO1_IO20 values do not change in FS

Technical Support
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1

Hello.

I need MX6QDL_PAD_SD1_DAT1 and MX6QDL_PAD_SD1_CLK pins configured as GPIO outputs.
To do this, I disabled usdhc1 in the device tree and declared them in the pinctrl_gpio_1 node with the value PAD_CTRL_HYS_PU.

&usdhc1 {
status = "disabled";
};

pinctrl_usdhc1: usdhc1grp {
fsl,pins = <
	// MX6QDL_PAD_SD1_CMD__SD1_CMD    0x17071
	// MX6QDL_PAD_SD1_CLK__SD1_CLK   	0x17071
	// MX6QDL_PAD_SD1_DAT0__SD1_DATA0 0x17071
	// MX6QDL_PAD_SD1_DAT1__SD1_DATA1 0x17071 
	// MX6QDL_PAD_SD1_DAT2__SD1_DATA2 0x17071
	// MX6QDL_PAD_SD1_DAT3__SD1_DATA3 0x17071
>;
};

pinctrl_gpio_1: gpio-1 {
fsl,pins = <
MX6QDL_PAD_SD1_CLK__GPIO1_IO20	   PAD_CTRL_HYS_PU
MX6QDL_PAD_SD1_DAT1__GPIO1_IO17	  PAD_CTRL_HYS_PU
>;
};

During kernel loading, I see on the oscilloscope that the value of these pins is 1, but as soon as the file system starts to mount, the value drops to 0.

I configure these pins as GPIO outputs with commands, but the oscilloscope shows that the value does not change

echo 20 > /sys/class/gpio/export
echo "out" > /sys/class/gpio/gpio20/direction
echo 1 > /sys/class/gpio/gpio20/value

echo 17 > /sys/class/gpio/export
echo "out" > /sys/class/gpio/gpio17/direction
echo 1 > /sys/class/gpio/gpio17/value

P.S. In bsp 2.8, with the same settings, the pin value changes.

2

Hi @Djadavin

Linux BSP V2.6

Bsp 2.6 is not supported anymore, since there are two recent Stable releases Bsp 2.7 and Bsp 2.8.

P.S. In bsp 2.8, with the same settings, the pin value changes.

That’s good. So the issue is Bsp 2.6 only?

Did you check if the value of pin is changed with the command:
cat /sys/class/gpio/gpio17/value

Could you provide the dmesg log from Bsp 2.6 in a text file?

Thanks and best regards,
Jaski