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

[Sunil V L]

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 at ventanamicro.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();
+}
+TIMER_ACPI_DECLARE(aclint_mtimer, ACPI_SIG_RHCT, riscv_timer_acpi_init);
+#endif
-- 
2.38.0