LMK04832: Linux driver support

Hello Liam,

I'm afraid we do not have a linux driver.  What are you looking to achieve?

73,
Timothy

Hello Liam,

You can use the TICS Pro software to generate a register map that you can program for boot time.

When you say configurations loaded from the device tree, can you elaborate what you mean by that?  You could save multiple register maps and program them in their entirety, or just the differences.  The only register to take care when programming is the PLL2 N register.  When it is programmed the VCO calibration will start.  So that should generally be the last register programmed if case a change to VCO frequency is required.

At run time, what do you anticipate changing?  Loop filter parameters?  Outputs off or on - or different clock format?  Input or output frequencies?

As for input/output frequencies.  The LMK04832 has integer output dividers.  This does limit the output frequencies you can change. If you were to change a output frequency, the new output frequency would need to be an integer division of the current VCO frequency.  If the new frequency is not an integer relationship to the current VCO frequency, a new VCO frequency must be calculated.  If the requested output frequencies are "poorly related" it is possible for the calculated VCO frequency may not be supported by the VCO range of the LMK04832.  --> Do you anticipate the case of poorly related frequencies occurring, or would the requested frequencies be requested with the knowledge of the supported frequencies?

Thank-you for helping me understand your need.

73,
Timothy