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@flygoat.com>
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Icenowy Zheng <zhengxingda@iscas.ac.cn>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Reviewed-by: Huacai Chen <chenhuacai@loongson.cn>
Link: https://patch.msgid.link/20260321092032.3502701-6-zhengxingda@iscas.ac.cn

diff --git a/drivers/irqchip/irq-loongson-pch-lpc.c b/drivers/irqchip/irq-loongson-pch-lpc.c
index 2bb6659e9a93c42cfa54345e8ffa1bfe75c3efb3..7117ca6fc2f0586d627a8b822d97ed03a7584bc9 100644 (file)
--- 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 */