IMX7D_UART6_ROOT_DIV
[IMX7D_UART6_ROOT_CLK] = { 0x4990, 0, IMX7D_UART6_ROOT_DIV },
[IMX7D_UART6_ROOT_DIV] = { 0xb200, 0, 0x3f, IMX7D_UART6_ROOT_PRE_DIV },