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i.MX6 UltraLite Dynamically controlling OSC32K_32K_OUT

Question asked by Martin Townsend on Feb 13, 2019
Latest reply on Feb 19, 2019 by jimmychan

Hi,

 

I have a requirement to dynamically control the OSC32K_32K_OUT signal that is on GPIO1_IO03 from kernel space.  I can set the pad configuration in the device tree or use devmem2 to set the mux mode to ALT3 in IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO03 to generate the clock but I need to do this dynamically within the kernel when a device requests the 32KHz clock which will occur in an interrupt context.

 

I'm using the linux-imx 4.9.11 kernel.  I'm guessing I have to add a new clock to the clock framework and provide the ability to turn it on and off by either setting the mux_mode of IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO03 to ALT3 and ALT5 respectively. 

 

Is there something already available for this? if not is it possible to do what I'm suggesting? or is there a better way?

 

Many Thanks,

Martin.

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