| Message ID | 20201107081420.60325-9-damien.lemoal@wdc.com |
|---|---|
| State | New |
| Headers | show |
| Series | RISC-V Kendryte K210 support improvments | expand |
On Sat, Nov 7, 2020 at 12:15 AM Damien Le Moal <damien.lemoal@wdc.com> wrote: > > If of_clk_init() is not called in time_init(), clock providers defined > in the system device tree are not initialized, resulting in failures for > other devices to initialize due to missing clocks. > Similarly to other architectures and to the default kernel time_init() > implementation, call of_clk_init() before executing timer_probe() in > time_init(). > > Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> > --- > arch/riscv/kernel/time.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/arch/riscv/kernel/time.c b/arch/riscv/kernel/time.c > index 4d3a1048ad8b..8a5cf99c0776 100644 > --- a/arch/riscv/kernel/time.c > +++ b/arch/riscv/kernel/time.c > @@ -4,6 +4,7 @@ > * Copyright (C) 2017 SiFive > */ > > +#include <linux/of_clk.h> > #include <linux/clocksource.h> > #include <linux/delay.h> > #include <asm/sbi.h> > @@ -24,6 +25,8 @@ void __init time_init(void) > riscv_timebase = prop; > > lpj_fine = riscv_timebase / HZ; > + > + of_clk_init(NULL); > timer_probe(); > } > > -- > 2.28.0 > > > _______________________________________________ > linux-riscv mailing list > linux-riscv@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv Reviewed-by: Atish Patra <atish.patra@wdc.com>
Quoting Damien Le Moal (2020-11-07 00:13:56) > If of_clk_init() is not called in time_init(), clock providers defined > in the system device tree are not initialized, resulting in failures for > other devices to initialize due to missing clocks. > Similarly to other architectures and to the default kernel time_init() > implementation, call of_clk_init() before executing timer_probe() in > time_init(). Do you have timers that need clks to be running or queryable this early? This of_clk_init() call is made here when architectures need to call things like clk_get_rate() to figure out some clk frequency for their clockevent or clocksource. It is OK to have this call here, I'm just curious if this is actually necessary vs. delaying it to later.
diff --git a/arch/riscv/kernel/time.c b/arch/riscv/kernel/time.c index 4d3a1048ad8b..8a5cf99c0776 100644 --- a/arch/riscv/kernel/time.c +++ b/arch/riscv/kernel/time.c @@ -4,6 +4,7 @@ * Copyright (C) 2017 SiFive */ +#include <linux/of_clk.h> #include <linux/clocksource.h> #include <linux/delay.h> #include <asm/sbi.h> @@ -24,6 +25,8 @@ void __init time_init(void) riscv_timebase = prop; lpj_fine = riscv_timebase / HZ; + + of_clk_init(NULL); timer_probe(); }
If of_clk_init() is not called in time_init(), clock providers defined in the system device tree are not initialized, resulting in failures for other devices to initialize due to missing clocks. Similarly to other architectures and to the default kernel time_init() implementation, call of_clk_init() before executing timer_probe() in time_init(). Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> --- arch/riscv/kernel/time.c | 3 +++ 1 file changed, 3 insertions(+)