irqchip/aslint-sswi: Resolve hart index

Resolve hart index according to assignment in the "riscv,hart-indexes"
property as defined in the specification [1]

Signed-off-by: Vladimir Kondratiev <vladimir.kondratiev@mobileye.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250612143911.3224046-6-vladimir.kondratiev@mobileye.com
Link: https://github.com/riscvarchive/riscv-aclint [1]

Author: vlkondratiev

drivers/irqchip/irq-aclint-sswi.c

@@ -71,6 +71,7 @@ static int __init aclint_sswi_parse_irq(struct fwnode_handle *fwnode, void __iom
 	for (u32 i = 0; i < contexts; i++) {
 		struct of_phandle_args parent;
 		unsigned long hartid;
+		u32 hart_index;
 		int rc, cpu;
 
 		rc = of_irq_parse_one(to_of_node(fwnode), i, &parent);
@@ -86,6 +87,11 @@ static int __init aclint_sswi_parse_irq(struct fwnode_handle *fwnode, void __iom
 
 		cpu = riscv_hartid_to_cpuid(hartid);
 
+		rc = riscv_get_hart_index(fwnode, i, &hart_index);
+		if (rc) {
+			pr_warn("%pfwP: hart index [%d] not found\n", fwnode, i);
+			return -EINVAL;
+		}
 		per_cpu(sswi_cpu_regs, cpu) = reg + hart_index * 4;
 	}