On 8/2/18 4:50 AM, Christoph Hellwig wrote:
From: Palmer Dabbelt <palmer@xxxxxxxxxx>
Follow the updated DT specs and read the timebase-frequency from the
CPU 0 node.
However, the DT in the HighFive Unleashed has the entry at the wrong place.
Even the example in github also at wrong place.
https://github.com/riscv/riscv-device-tree-doc/pull/8/commits/2461d481329c55005fcbe684f0d6bdb3b7f0a432
DT should be consistent between Documentation and the one in the
hardware. I can fix them in bbl & submit a bbl patch. But I am not sure
if that's an acceptable way to do it.
Regards,
Atish
Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxx>
[hch: updated changelog]
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
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();
}
--
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