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

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Message-ID: <Y+p1zjFDcPpgFxuw@sunil-laptop>
Date:   Mon, 13 Feb 2023 23:09:26 +0530
From:   Sunil V L <sunilvl@...tanamicro.com>
To:     Conor Dooley <conor@...nel.org>
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 Thu, Feb 09, 2023 at 08:58:25PM +0000, Conor Dooley wrote:
> 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?
> 
We have plans to add a flag in RHCT. But that still needs approval.

Thanks
Sunil