[PATCH v8 21/24] mailbox/riscv-sbi-mpxy: Add ACPI support

[Anup Patel <apatel@xxxxxxxxxxxxxxxx>]

From: Sunil V L <sunilvl@xxxxxxxxxxxxxxxx>

Add ACPI support for the RISC-V SBI message proxy (MPXY) based
mailbox driver.

Signed-off-by: Sunil V L <sunilvl@xxxxxxxxxxxxxxxx>
Signed-off-by: Anup Patel <apatel@xxxxxxxxxxxxxxxx>
---
 drivers/mailbox/riscv-sbi-mpxy-mbox.c | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/drivers/mailbox/riscv-sbi-mpxy-mbox.c b/drivers/mailbox/riscv-sbi-mpxy-mbox.c
index 1a8a74d3ad4b..a739088c3d4c 100644
--- a/drivers/mailbox/riscv-sbi-mpxy-mbox.c
+++ b/drivers/mailbox/riscv-sbi-mpxy-mbox.c
@@ -5,9 +5,11 @@
  * Copyright (C) 2025 Ventana Micro Systems Inc.
  */
 
+#include <linux/acpi.h>
 #include <linux/cpu.h>
 #include <linux/errno.h>
 #include <linux/init.h>
+#include <linux/irqchip/riscv-imsic.h>
 #include <linux/mailbox_controller.h>
 #include <linux/mailbox/riscv-rpmi-message.h>
 #include <linux/minmax.h>
@@ -902,6 +904,8 @@ static int mpxy_mbox_probe(struct platform_device *pdev)
 	 * explicitly configure here.
 	 */
 	if (!dev_get_msi_domain(dev)) {
+		struct fwnode_handle *fwnode = dev_fwnode(dev);
+
 		/*
 		 * The device MSI domain for OF devices is only set at the
 		 * time of populating/creating OF device. If the device MSI
@@ -909,8 +913,15 @@ static int mpxy_mbox_probe(struct platform_device *pdev)
 		 * then we need to set it explicitly before using any platform
 		 * MSI functions.
 		 */
-		if (dev_of_node(dev))
+		if (is_of_node(fwnode)) {
 			of_msi_configure(dev, dev_of_node(dev));
+		} else if (is_acpi_device_node(fwnode)) {
+			struct irq_domain *msi_domain;
+
+			msi_domain = irq_find_matching_fwnode(imsic_acpi_get_fwnode(dev),
+							      DOMAIN_BUS_PLATFORM_MSI);
+			dev_set_msi_domain(dev, msi_domain);
+		}
 
 		if (!dev_get_msi_domain(dev))
 			return -EPROBE_DEFER;
@@ -958,6 +969,13 @@ static int mpxy_mbox_probe(struct platform_device *pdev)
 		return rc;
 	}
 
+#ifdef CONFIG_ACPI
+	struct acpi_device *adev = ACPI_COMPANION(dev);
+
+	if (adev)
+		acpi_dev_clear_dependencies(adev);
+#endif
+
 	dev_info(dev, "mailbox registered with %d channels\n",
 		 mbox->channel_count);
 	return 0;
@@ -977,10 +995,17 @@ static const struct of_device_id mpxy_mbox_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, mpxy_mbox_of_match);
 
+static const struct acpi_device_id mpxy_mbox_acpi_match[] = {
+	{ "RSCV0005" },
+	{}
+};
+MODULE_DEVICE_TABLE(acpi, mpxy_mbox_acpi_match);
+
 static struct platform_driver mpxy_mbox_driver = {
 	.driver = {
 		.name = "riscv-sbi-mpxy-mbox",
 		.of_match_table = mpxy_mbox_of_match,
+		.acpi_match_table = mpxy_mbox_acpi_match,
 	},
 	.probe = mpxy_mbox_probe,
 	.remove = mpxy_mbox_remove,
-- 
2.43.0