linux-kernel - [PATCH 5/8] irqchip/loongson-pch-lpc: add OF init code

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Message-ID: <20260131094547.455916-6-zhengxingda@iscas.ac.cn>
Date: Sat, 31 Jan 2026 17:45:44 +0800
From: Icenowy Zheng <zhengxingda@...as.ac.cn>
To: Thomas Gleixner <tglx@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Huacai Chen <chenhuacai@...nel.org>,
	Jiaxun Yang <jiaxun.yang@...goat.com>
Cc: linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-mips@...r.kernel.org,
	Icenowy Zheng <zhengxingda@...as.ac.cn>
Subject: [PATCH 5/8] irqchip/loongson-pch-lpc: add OF init code

As the (kernel-internally) OF-based MIPS Loongson-3 systems can also
have PCH LPC interrupt controller, add OF-based initialization code for
the driver.

Co-developed-by: Jiaxun Yang <jiaxun.yang@...goat.com>
Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
Signed-off-by: Icenowy Zheng <zhengxingda@...as.ac.cn>
---
 drivers/irqchip/irq-loongson-pch-lpc.c | 28 ++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/irqchip/irq-loongson-pch-lpc.c b/drivers/irqchip/irq-loongson-pch-lpc.c
index 96489e031d34e..0baa93028abf4 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"
@@ -257,3 +259,29 @@ int __init pch_lpc_acpi_init(struct irq_domain *parent,
 	return 0;
 }
 #endif /* CONFIG_ACPI */
+
+#ifdef CONFIG_OF
+static int pch_lpc_of_init(struct device_node *node,
+				struct device_node *parent)
+{
+	int parent_irq;
+	struct fwnode_handle *irq_handle;
+	struct resource res;
+
+	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);
+
+	return pch_lpc_init(res.start, resource_size(&res), irq_handle,
+			    parent_irq);
+}
+
+IRQCHIP_DECLARE(pch_lpc, "loongson,pch-lpc-1.0", pch_lpc_of_init);
+#endif /* CONFIG_OF */
-- 
2.52.0