Hi Srinivasa
for i.MX6DQ only uSDHC module has voltage selection in register
uSDHCx_VEND_SPEC (VSELECT - controls the voltage on pads for external card),
for other modules voltage level is defined by its power supply value given in
Table 100 i.MX6DQ Datasheet (rev.4, 7/2015)
http://cache.freescale.com/files/32bit/doc/data_sheet/IMX6DQCEC.pdf
Best regards
igor
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