[riscv] Read the timer frequency from the device tree

littlekernel / lk

LK embedded kernel

MIT License

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[riscv] Read the timer frequency from the device tree #318

Open heatd opened 2 years ago

heatd commented 2 years ago

Currently, lk relies on platform code to define ARCH_RISCV_MTIME_RATE with the timer's frequency. This can be avoided by reading /cpus/timebase-frequency (for all CPUs, if it exists) and /cpus/cpu*/timebase-frequency (for each CPU) in the supplied FDT.