[tip: irq/drivers] irqchip/loongson-pch-lpc: Add OF init code

[tip-bot2 for Icenowy Zheng]

The following commit has been merged into the irq/drivers branch of tip:

Commit-ID:     ed3772aa48cf84ae313156cfe6544e8cba5aa043
Gitweb:        https://git.kernel.org/tip/ed3772aa48cf84ae313156cfe6544e8cba5aa043
Author:        Icenowy Zheng <zhengxingda@xxxxxxxxxxx>
AuthorDate:    Sat, 21 Mar 2026 17:20:31 +08:00
Committer:     Thomas Gleixner <tglx@xxxxxxxxxx>
CommitterDate: Thu, 26 Mar 2026 16:15:04 +01:00

irqchip/loongson-pch-lpc: Add OF init code

The OF-based MIPS Loongson-3 systems can also have a PCH LPC interrupt
controller.

Add OF-based initialization code for this driver.

Co-developed-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
Signed-off-by: Icenowy Zheng <zhengxingda@xxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxx>
Reviewed-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
Link: https://patch.msgid.link/20260321092032.3502701-6-zhengxingda@xxxxxxxxxxx
---
 drivers/irqchip/irq-loongson-pch-lpc.c | 35 +++++++++++++++++++++++++-
 1 file changed, 35 insertions(+)

diff --git a/drivers/irqchip/irq-loongson-pch-lpc.c b/drivers/irqchip/irq-loongson-pch-lpc.c
index 2bb6659..7117ca6 100644
--- a/drivers/irqchip/irq-loongson-pch-lpc.c
+++ b/drivers/irqchip/irq-loongson-pch-lpc.c
@@ -13,6 +13,8 @@
 #include <linux/irqchip/chained_irq.h>
 #include <linux/irqdomain.h>
 #include <linux/kernel.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
 #include <linux/syscore_ops.h>
 
 #include "irq-loongson.h"
@@ -224,6 +226,7 @@ free_priv:
 	return -ENOMEM;
 }
 
+#ifdef CONFIG_ACPI
 int __init pch_lpc_acpi_init(struct irq_domain *parent, struct acpi_madt_lpc_pic *acpi_pchlpc)
 {
 	struct fwnode_handle *irq_handle;
@@ -256,3 +259,35 @@ int __init pch_lpc_acpi_init(struct irq_domain *parent, struct acpi_madt_lpc_pic
 
 	return 0;
 }
+#endif /* CONFIG_ACPI */
+
+#ifdef CONFIG_OF
+static int __init pch_lpc_of_init(struct device_node *node, struct device_node *parent)
+{
+	struct fwnode_handle *irq_handle;
+	struct resource res;
+	int parent_irq, ret;
+
+	if (of_address_to_resource(node, 0, &res))
+		return -EINVAL;
+
+	parent_irq = irq_of_parse_and_map(node, 0);
+	if (!parent_irq) {
+		pr_err("Failed to get the parent IRQ for LPC IRQs\n");
+		return -EINVAL;
+	}
+
+	irq_handle = of_fwnode_handle(node);
+
+	ret = pch_lpc_init(res.start, resource_size(&res), irq_handle,
+			   parent_irq);
+	if (ret) {
+		irq_dispose_mapping(parent_irq);
+		return ret;
+	}
+
+	return 0;
+}
+
+IRQCHIP_DECLARE(pch_lpc, "loongson,ls7a-lpc", pch_lpc_of_init);
+#endif /* CONFIG_OF */