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

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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
This commit is contained in:
Icenowy Zheng
2026-03-21 17:20:31 +08:00
committed by Thomas Gleixner
parent 29c10a0af0
commit ed3772aa48
1 changed files with 35 additions and 0 deletions
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35
drivers/irqchip/irq-loongson-pch-lpc.c
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@@ -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 @@ static int __init pch_lpc_init(phys_addr_t addr, unsigned long size,
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 */