Hi tsung
"8" means that pin does not need config according to documentation :
linux/Documentation/devicetree/bindings/pinctrl/fsl,imx-pinctrl.txt
fsl,imx-pinctrl.txt\pinctrl\bindings\devicetree\Documentation - linux-imx - i.MX Linux kernel
so one can remove it and set appropriate pull bits as described in sect.36.4.460 Pad Control Register
(IOMUXC_SW_PAD_CTL_PAD_SD2_CMD) i.MX6DQ Reference Manual
Best regards
igor
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