[PATCH v2 2/2] clocksource: timer-riscv: Set CLOCK_EVT_FEAT_C3STOP based on DT property

From: Anup Patel <apatel@ventanamicro.com>
To: Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Jones <ajones@ventanamicro.com>,
	Atish Patra <atishp@atishpatra.org>,
	Samuel Holland <samuel@sholland.org>,
	Anup Patel <anup@brainfault.org>,
	devicetree@vger.kernel.org, linux-riscv@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	Anup Patel <apatel@ventanamicro.com>
Subject: [PATCH v2 2/2] clocksource: timer-riscv: Set CLOCK_EVT_FEAT_C3STOP based on DT property
Date: Wed, 27 Jul 2022 17:13:02 +0530	[thread overview]
Message-ID: <20220727114302.302201-3-apatel@ventanamicro.com> (raw)
In-Reply-To: <20220727114302.302201-1-apatel@ventanamicro.com>

We should set CLOCK_EVT_FEAT_C3STOP for a clock_event_device only when
riscv,timer-can-wake-cpu DT property is not present for the corresponding
CPU.

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>
---
 drivers/clocksource/timer-riscv.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/clocksource/timer-riscv.c b/drivers/clocksource/timer-riscv.c
index 593d5a957b69..92a0b9832d8c 100644
--- a/drivers/clocksource/timer-riscv.c
+++ b/drivers/clocksource/timer-riscv.c
@@ -34,7 +34,7 @@ static int riscv_clock_next_event(unsigned long delta,
 static unsigned int riscv_clock_event_irq;
 static DEFINE_PER_CPU(struct clock_event_device, riscv_clock_event) = {
 	.name			= "riscv_timer_clockevent",
-	.features		= CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_C3STOP,
+	.features		= CLOCK_EVT_FEAT_ONESHOT,
 	.rating			= 100,
 	.set_next_event		= riscv_clock_next_event,
 };
@@ -65,9 +65,13 @@ static struct clocksource riscv_clocksource = {
 static int riscv_timer_starting_cpu(unsigned int cpu)
 {
 	struct clock_event_device *ce = per_cpu_ptr(&riscv_clock_event, cpu);
+	struct device_node *np = of_get_cpu_node(cpu, NULL);
 
 	ce->cpumask = cpumask_of(cpu);
 	ce->irq = riscv_clock_event_irq;
+	if (!of_property_read_bool(np, "riscv,timer-can-wake-cpu"))
+		ce->features |= CLOCK_EVT_FEAT_C3STOP;
+	of_node_put(np);
 	clockevents_config_and_register(ce, riscv_timebase, 100, 0x7fffffff);
 
 	enable_percpu_irq(riscv_clock_event_irq,
-- 
2.34.1


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