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Clock sources for timers (i.MX6Q SDP)

Question asked by jotes on Jul 10, 2013
Latest reply on Sep 23, 2016 by Yee Lun Ong

Hello everyone!


I have 2 questions related to clock sources on i.MX6Q SDP. I'm using L3.0.35_4.0.0_130424, CPU frequency is 996 MHz.


1) What is the frequency of the ARM private timer's clock? Is it IPG_CLK_ROOT, ½ of ARM_CLK_ROOT, or maybe something else?


2) How to set the clock input source for EPIT to ipq_clk (Peripheral clock)? According to i.MX 6Dual/6Quad Applications Processor Reference Manual it should be done by setting bit 24 in EPITx_CR register. But as I observed, EPIT starts only when CLKSRC is set to Low-frequency reference clock (bits 24 and 25 are set).