Re: [PATCH V3 16/20] clocksource/timer-riscv: Add ACPI support

Conor Dooley
2023-03-06T21:06:38Z

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On Fri, Mar 03, 2023 at 07:06:43PM +0530, Sunil V L wrote:
> Initialize the timer driver based on RHCT table on ACPI based
> platforms.
>
> Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> Reviewed-by: Andrew Jones <ajones@ventanamicro.com>

The SBI spec allows for implementations where the timer cannot wake the
cpu. You previously said "We have plans to add a flag in RHCT. But that
still needs approval.", so could you please convert this to a more
concrete wording and put the explanation for why this is missing into
the commit message?

Cheers,
Conor.

> ---
> drivers/clocksource/timer-riscv.c | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/drivers/clocksource/timer-riscv.c b/drivers/clocksource/timer-riscv.c
> index cecc4662293b..da3071b387eb 100644
> --- a/drivers/clocksource/timer-riscv.c
> +++ b/drivers/clocksource/timer-riscv.c
> @@ -10,6 +10,7 @@
>
> #define pr_fmt(fmt) "riscv-timer: " fmt
>
> +#include <linux/acpi.h>
> #include <linux/clocksource.h>
> #include <linux/clockchips.h>
> #include <linux/cpu.h>
> @@ -207,3 +208,13 @@ static int __init riscv_timer_init_dt(struct device_node *n)
> }
>
> TIMER_OF_DECLARE(riscv_timer, "riscv", riscv_timer_init_dt);
> +
> +#ifdef CONFIG_ACPI
> +static int __init riscv_timer_acpi_init(struct acpi_table_header *table)
> +{
> + return riscv_timer_init_common();
> +}
> +
> +TIMER_ACPI_DECLARE(aclint_mtimer, ACPI_SIG_RHCT, riscv_timer_acpi_init);
> +
> +#endif
> --
> 2.34.1
>

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