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    Subject[PATCH 09/11] RISC-V: Support per-hart timebase-frequency
    Date
    From: Palmer Dabbelt <palmer@sifive.com>

    Follow the updated DT specs and read the timebase-frequency from the
    CPU 0 node.

    Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>
    [hch: updated changelog]
    Signed-off-by: Christoph Hellwig <hch@lst.de>
    ---
    arch/riscv/kernel/time.c | 17 ++++++++++++-----
    1 file changed, 12 insertions(+), 5 deletions(-)

    diff --git a/arch/riscv/kernel/time.c b/arch/riscv/kernel/time.c
    index 0df9b2cbd645..1bb01dc2d0f1 100644
    --- a/arch/riscv/kernel/time.c
    +++ b/arch/riscv/kernel/time.c
    @@ -24,17 +24,24 @@ void __init init_clockevent(void)
    csr_set(sie, SIE_STIE);
    }

    -void __init time_init(void)
    +static long __init timebase_frequency(void)
    {
    struct device_node *cpu;
    u32 prop;

    cpu = of_find_node_by_path("/cpus");
    - if (!cpu || of_property_read_u32(cpu, "timebase-frequency", &prop))
    - panic(KERN_WARNING "RISC-V system with no 'timebase-frequency' in DTS\n");
    - riscv_timebase = prop;
    + if (cpu && !of_property_read_u32(cpu, "timebase-frequency", &prop))
    + return prop;
    + cpu = of_find_node_by_path("/cpus/cpu@0");
    + if (cpu && !of_property_read_u32(cpu, "timebase-frequency", &prop))
    + return prop;

    - lpj_fine = riscv_timebase / HZ;
    + panic(KERN_WARNING "RISC-V system with no 'timebase-frequency' in DTS\n");
    +}

    +void __init time_init(void)
    +{
    + riscv_timebase = timebase_frequency();
    + lpj_fine = riscv_timebase / HZ;
    init_clockevent();
    }
    --
    2.18.0
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