Armada 370/XP clocksource fixes
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Cover letter [PATCH 0/5] Armada 370/XP clocksource fixes
Dear Andrew Lunn,
Quoted 4 lines · Andrew Lunn
Quoted 3 lines · Ezequiel Garcia
This small patchset fixes a somewhat minor issue found in the clocksource driver for Armada 370/XP SoC.
Quoted 8 lines
Quoted 2 lines
The Armada 370 SoC has no 25 MHz fixed timer, while the Armada XP SoC cannot work properly without such 25 MHz fixed timer selected.
Hi Ezequiel
Is the XP case a silicon bug, or a design feature? If its a silicon bug, is it likely to be fixed in later steppings of the SOCs? If this feature is to come back, might we want to keep the property?
My understanding is that it's a design feature. Using the non-25 Mhz timer leads to using a clocksource whose frequency varies when doing cpufreq frequency changes, which isn't nice to handle. The fixed 25 Mhz was added in Armada XP to solve this problem, as far as I understood.
Thanks,
Thomas
Signature · 4 lines
Thomas Petazzoni, Free Electrons Kernel, drivers, real-time and embedded Linux development, consulting, training and support. http://free-electrons.com