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clocksource/timer-riscv: Add ACPI support

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Initialize the timer driver based on RHCT table on ACPI based
platforms.

Currently, ACPI doesn't support a flag to indicate that the
timer interrupt can wake up the cpu irrespective of its
power state. It will be added in future update.

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>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230515054928.2079268-19-sunilvl@ventanamicro.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Sunil V L 2023-05-15 11:19:25 +05:30 committed by Palmer Dabbelt
parent cd12d20668
commit 21f4f92410
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1 changed files with 11 additions and 0 deletions
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11
drivers/clocksource/timer-riscv.c
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@ -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