Dynamically configure timers' base frequency for Armada 38x

[mw]

Summary

Instead of using 'clock-frequency' device tree property for global/twd
mpcore timers of Armada 38x SoCs, set it in platform_late_init stage
with arm_tmr_change_frequency() function.

[andrew]

Why not do the same as Linux and calculate it dynamically?

[mw]

Is there clock framework in the FreeBSD, so that it can obtain clock from device tree phandle: (clocks = <&coreclk 2>;) and later to clk_get() and clk_prepare_enable()? Later it is done in Linux by clk_get_rate() callback.

[manu]

In D11881#246387, @mw wrote:

Is there clock framework in the FreeBSD, so that it can obtain clock from device tree phandle: (clocks = <&coreclk 2>;) and later to clk_get() and clk_prepare_enable()? Later it is done in Linux by clk_get_rate() callback.

Look at sys/dev/extres/clk.
But I guess this will be hard to convert the Marvell port to it.

[mw]

@manu thanks for pointing the code does any platform/driver use it?

About the change itself - I found an easy way to avoid timer node fixup: I called arm_tmr_change_frequency() from platform_late_init and it works fine. I'll submit updated patchset.

[manu]

In D11881#246860, @mw wrote:

@manu thanks for pointing the code does any platform/driver use it?

Yes the Tegra port and Allwinner uses it exclusively.

[mw]

• Abandon fdt fixup
• Update commit message

[mw]

@manu Do you find the newest version of the patch acceptable?