diff mbox series

[v4,06/18] arm64: arch_timer: Implement support for interrupt-names

Message ID 20210402090542.131194-7-marcan@marcan.st
State Accepted
Commit 86332e9e3477af8f31c9d5f3e81e57e0fd2118e7
Headers show
Series Apple M1 SoC platform bring-up | expand

Commit Message

Hector Martin April 2, 2021, 9:05 a.m. UTC 
This allows the devicetree to correctly represent the available set of
timers, which varies from device to device, without the need for fake
dummy interrupts for unavailable slots.

Also add the hyp-virt timer/PPI, which is not currently used, but worth
representing.

Reviewed-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Hector Martin <marcan@marcan.st>
---
 drivers/clocksource/arm_arch_timer.c | 24 +++++++++++++++++++++---
 include/clocksource/arm_arch_timer.h |  1 +
 2 files changed, 22 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index d0177824c518..932f95691e27 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -63,6 +63,14 @@  struct arch_timer {
 static u32 arch_timer_rate;
 static int arch_timer_ppi[ARCH_TIMER_MAX_TIMER_PPI];
 
+static const char *arch_timer_ppi_names[ARCH_TIMER_MAX_TIMER_PPI] = {
+	[ARCH_TIMER_PHYS_SECURE_PPI]	= "sec-phys",
+	[ARCH_TIMER_PHYS_NONSECURE_PPI]	= "phys",
+	[ARCH_TIMER_VIRT_PPI]		= "virt",
+	[ARCH_TIMER_HYP_PPI]		= "hyp-phys",
+	[ARCH_TIMER_HYP_VIRT_PPI]	= "hyp-virt",
+};
+
 static struct clock_event_device __percpu *arch_timer_evt;
 
 static enum arch_timer_ppi_nr arch_timer_uses_ppi = ARCH_TIMER_VIRT_PPI;
@@ -1280,8 +1288,9 @@  static void __init arch_timer_populate_kvm_info(void)
 
 static int __init arch_timer_of_init(struct device_node *np)
 {
-	int i, ret;
+	int i, irq, ret;
 	u32 rate;
+	bool has_names;
 
 	if (arch_timers_present & ARCH_TIMER_TYPE_CP15) {
 		pr_warn("multiple nodes in dt, skipping\n");
@@ -1289,8 +1298,17 @@  static int __init arch_timer_of_init(struct device_node *np)
 	}
 
 	arch_timers_present |= ARCH_TIMER_TYPE_CP15;
-	for (i = ARCH_TIMER_PHYS_SECURE_PPI; i < ARCH_TIMER_MAX_TIMER_PPI; i++)
-		arch_timer_ppi[i] = irq_of_parse_and_map(np, i);
+
+	has_names = of_property_read_bool(np, "interrupt-names");
+
+	for (i = ARCH_TIMER_PHYS_SECURE_PPI; i < ARCH_TIMER_MAX_TIMER_PPI; i++) {
+		if (has_names)
+			irq = of_irq_get_byname(np, arch_timer_ppi_names[i]);
+		else
+			irq = of_irq_get(np, i);
+		if (irq > 0)
+			arch_timer_ppi[i] = irq;
+	}
 
 	arch_timer_populate_kvm_info();
 
diff --git a/include/clocksource/arm_arch_timer.h b/include/clocksource/arm_arch_timer.h
index 1d68d5613dae..73c7139c866f 100644
--- a/include/clocksource/arm_arch_timer.h
+++ b/include/clocksource/arm_arch_timer.h
@@ -32,6 +32,7 @@  enum arch_timer_ppi_nr {
 	ARCH_TIMER_PHYS_NONSECURE_PPI,
 	ARCH_TIMER_VIRT_PPI,
 	ARCH_TIMER_HYP_PPI,
+	ARCH_TIMER_HYP_VIRT_PPI,
 	ARCH_TIMER_MAX_TIMER_PPI
 };