clocksource/drivers/timer-riscv: Set CLOCK_EVT_FEAT_C3STOP based on DT
authorAnup Patel <apatel@ventanamicro.com>
Tue, 3 Jan 2023 14:11:02 +0000 (19:41 +0530)
committerDaniel Lezcano <daniel.lezcano@linaro.org>
Mon, 13 Feb 2023 12:10:16 +0000 (13:10 +0100)
We should set CLOCK_EVT_FEAT_C3STOP for a clock_event_device only
when riscv,timer-cannot-wake-cpu DT property is present in the RISC-V
timer DT node.

This way CLOCK_EVT_FEAT_C3STOP feature is set for clock_event_device
based on RISC-V platform capabilities rather than having it set for
all RISC-V platforms.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Link: https://lore.kernel.org/r/20230103141102.772228-4-apatel@ventanamicro.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org>
drivers/clocksource/timer-riscv.c

index a0d66fa..1b4b36d 100644 (file)
@@ -28,6 +28,7 @@
 #include <asm/timex.h>
 
 static DEFINE_STATIC_KEY_FALSE(riscv_sstc_available);
+static bool riscv_timer_cannot_wake_cpu;
 
 static int riscv_clock_next_event(unsigned long delta,
                struct clock_event_device *ce)
@@ -85,6 +86,8 @@ static int riscv_timer_starting_cpu(unsigned int cpu)
 
        ce->cpumask = cpumask_of(cpu);
        ce->irq = riscv_clock_event_irq;
+       if (riscv_timer_cannot_wake_cpu)
+               ce->features |= CLOCK_EVT_FEAT_C3STOP;
        clockevents_config_and_register(ce, riscv_timebase, 100, 0x7fffffff);
 
        enable_percpu_irq(riscv_clock_event_irq,
@@ -139,6 +142,13 @@ static int __init riscv_timer_init_dt(struct device_node *n)
        if (cpuid != smp_processor_id())
                return 0;
 
+       child = of_find_compatible_node(NULL, NULL, "riscv,timer");
+       if (child) {
+               riscv_timer_cannot_wake_cpu = of_property_read_bool(child,
+                                       "riscv,timer-cannot-wake-cpu");
+               of_node_put(child);
+       }
+
        domain = NULL;
        child = of_get_compatible_child(n, "riscv,cpu-intc");
        if (!child) {