MIPS: cevt-txx9: Implement read_sched_clock
Use txx9 up-counter for sched_clock source. This implementation will give high resolution cputime accounting. Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@imgtec.com> Cc: linux-mips@linux-mips.org Cc: macro@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9484/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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