topic Re: Is there any way to control (modify/enable) clock on Linux? in S32G

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

Jeff-CF-Huang — Thu, 16 May 2024 06:47:47 GMT

Hi Sir,

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

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

chenyin_h — Thu, 16 May 2024 10:00:03 GMT

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

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

Jeff-CF-Huang — Thu, 16 May 2024 10:46:11 GMT

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.

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

chenyin_h — Fri, 17 May 2024 07:18:27 GMT

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

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

Jeff-CF-Huang — Fri, 17 May 2024 08:06:49 GMT

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

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

chenyin_h — Fri, 17 May 2024 10:48:48 GMT

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