By Cortex ™ -A9 MPCore Technical Reference Manual, the global timer is clocked by PERIPHCLK. I don't know which clock is it in iMX6QSD CCM Clock Tree.
By my test the clock frequency of ARM global timer is changed when I change ARM clock frequency for DVFS. So I guess the clock of the global timer may be ARM_CLK_ROOT. Is it correct?
What is the clock frequency of ARM global timer?