Is there any way to control (modify/enable) clock on Linux?

[Jeff-CF-Huang]

Hi Sir,

Is there any way to control (modify/enable) clock on Linux?

[chenyin_h · Accepted solution]

 Hello, @Jeff-CF-Huang

Thanks for the feedback

From the BSP perspective, seems no such functions in Linux, sorry for your inconvenience.

Best Regards

Chenyin

[chenyin_h]

Hello, @Jeff-CF-Huang

Thanks for the feedback

For what we are able to see, the clocks seem to be enabled under ATF(From BSP view). We are not seeing anything under Linux to modify/enable clocks.

Best Regards

Chenyin

[Jeff-CF-Huang]

We want to configure the clock dynamically in the Linux kernel, including enabling, disabling, and changing the rate.

[chenyin_h]

Hello, @Jeff-CF-Huang

Thanks for the questions。

Sorry that I am not quite catching you, would you please help to clarify the questions? Which clock you were referring to?

Best Regards

Chenyin

[Jeff-CF-Huang]

I can get the clk summary at /sys/kernel/debug/clk.

enable prepare protect duty hardware
clock count count count rate accuracy phase cycle enable
-------------------------------------------------------------------------------------------------------
pcf85063-clkout 0 0 0 0 0 0 50000 Y
llce_per 0 0 0 80000000 0 0 50000 Y
llce_sys 0 0 0 198309214 0 0 50000 Y

But, I can't find a file node to enable/disable the clock.
For example:
I want to enable the clk of qspi_flash1x & qspi_flash2x.