linux-kernel - Re: [PATCH 16/24] RISC-V: ACPI: clocksource/timer-riscv: Add ACPI support

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Message-ID: <Y+VecXd9PVpkDggY@spud>
Date:   Thu, 9 Feb 2023 20:58:25 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Sunil V L <sunilvl@...tanamicro.com>
Cc:     Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        linux-riscv@...ts.infradead.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        Anup Patel <apatel@...tanamicro.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Atish Patra <atishp@...osinc.com>
Subject: Re: [PATCH 16/24] RISC-V: ACPI: clocksource/timer-riscv: Add ACPI
 support

On Mon, Jan 30, 2023 at 11:52:17PM +0530, Sunil V L wrote:
> timer-riscv driver needs to get the timebase-frequency from
> RISC-V Hart Capabilities Table (RHCT) on ACPI platforms. Add
> support to read the information from RHCT.
> 
> Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
> ---
>  drivers/clocksource/timer-riscv.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/clocksource/timer-riscv.c b/drivers/clocksource/timer-riscv.c
> index 4016c065a01c..8079666753a6 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>
> @@ -198,3 +199,11 @@ 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();

I feel like I need to ask as it was deleted in the previous patch, how
does ACPI determine whether the arch timer can wake the CPUs?

Cheers,
Conor.


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