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Subject[PATCH 2/6] irqchip/riscv-intc: Set intc domain as the default host
Date
We have quite a few RISC-V drivers (such as RISC-V SBI IPI driver,
RISC-V timer driver, RISC-V PMU driver, etc) which do not have a
dedicated DT/ACPI fwnode. This patch makes intc domain as the default
host so that these drivers can directly create local interrupt mapping
using standardized local interrupt numbers

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
---
drivers/clocksource/timer-riscv.c | 17 +----------------
drivers/irqchip/irq-riscv-intc.c | 9 +++++++++
2 files changed, 10 insertions(+), 16 deletions(-)

diff --git a/drivers/clocksource/timer-riscv.c b/drivers/clocksource/timer-riscv.c
index 1767f8bf2013..dd6916ae6365 100644
--- a/drivers/clocksource/timer-riscv.c
+++ b/drivers/clocksource/timer-riscv.c
@@ -102,8 +102,6 @@ static irqreturn_t riscv_timer_interrupt(int irq, void *dev_id)
static int __init riscv_timer_init_dt(struct device_node *n)
{
int cpuid, hartid, error;
- struct device_node *child;
- struct irq_domain *domain;

hartid = riscv_of_processor_hartid(n);
if (hartid < 0) {
@@ -121,20 +119,7 @@ static int __init riscv_timer_init_dt(struct device_node *n)
if (cpuid != smp_processor_id())
return 0;

- domain = NULL;
- child = of_get_compatible_child(n, "riscv,cpu-intc");
- if (!child) {
- pr_err("Failed to find INTC node [%pOF]\n", n);
- return -ENODEV;
- }
- domain = irq_find_host(child);
- of_node_put(child);
- if (!domain) {
- pr_err("Failed to find IRQ domain for node [%pOF]\n", n);
- return -ENODEV;
- }
-
- riscv_clock_event_irq = irq_create_mapping(domain, RV_IRQ_TIMER);
+ riscv_clock_event_irq = irq_create_mapping(NULL, RV_IRQ_TIMER);
if (!riscv_clock_event_irq) {
pr_err("Failed to map timer interrupt for node [%pOF]\n", n);
return -ENODEV;
diff --git a/drivers/irqchip/irq-riscv-intc.c b/drivers/irqchip/irq-riscv-intc.c
index b65bd8878d4f..9f0a7a8a5c4d 100644
--- a/drivers/irqchip/irq-riscv-intc.c
+++ b/drivers/irqchip/irq-riscv-intc.c
@@ -125,6 +125,15 @@ static int __init riscv_intc_init(struct device_node *node,
return rc;
}

+ /*
+ * Make INTC as the default domain which will allow drivers
+ * not having dedicated DT/ACPI fwnode (such as RISC-V SBI IPI
+ * driver, RISC-V timer driver, RISC-V PMU driver, etc) can
+ * directly create local interrupt mapping using standardized
+ * local interrupt numbers.
+ */
+ irq_set_default_host(intc_domain);
+
cpuhp_setup_state(CPUHP_AP_IRQ_RISCV_STARTING,
"irqchip/riscv/intc:starting",
riscv_intc_cpu_starting,
--
2.25.1
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