[RFC PATCH v2 15/17] mailbox/riscv-sbi-mpxy: Add ACPI support

[Anup Patel <apatel@ventanamicro.com>]

From: Sunil V L <sunilvl@ventanamicro.com>

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

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
---
 drivers/mailbox/riscv-sbi-mpxy-mbox.c | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/drivers/mailbox/riscv-sbi-mpxy-mbox.c b/drivers/mailbox/riscv-sbi-mpxy-mbox.c
index 4021f62ff487..0ce89970c5bd 100644
--- a/drivers/mailbox/riscv-sbi-mpxy-mbox.c
+++ b/drivers/mailbox/riscv-sbi-mpxy-mbox.c
@@ -5,6 +5,7 @@
  * Copyright (C) 2024 Ventana Micro Systems Inc.
  */
 
+#include <linux/acpi.h>
 #include <asm/sbi.h>
 #include <linux/cpu.h>
 #include <linux/err.h>
@@ -12,6 +13,7 @@
 #include <linux/jump_label.h>
 #include <linux/kernel.h>
 #include <linux/mailbox_controller.h>
+#include <linux/irqchip/riscv-imsic.h>
 #include <linux/mailbox/riscv-rpmi-message.h>
 #include <linux/mm.h>
 #include <linux/module.h>
@@ -924,8 +926,16 @@ static int mpxy_mbox_probe(struct platform_device *pdev)
 		 * then we need to set it explicitly before using any platform
 		 * MSI functions.
 		 */
-		if (is_of_node(dev->fwnode))
+		if (is_of_node(dev->fwnode)) {
 			of_msi_configure(dev, to_of_node(dev->fwnode));
+		} else {
+			struct irq_domain *msi_domain;
+
+			msi_domain = irq_find_matching_fwnode(imsic_acpi_get_fwnode(dev),
+							      DOMAIN_BUS_PLATFORM_MSI);
+			if (msi_domain)
+				dev_set_msi_domain(dev, msi_domain);
+		}
 	}
 
 	/* Setup MSIs for mailbox (if required) */
@@ -970,6 +980,10 @@ static int mpxy_mbox_probe(struct platform_device *pdev)
 		return rc;
 	}
 
+#ifdef CONFIG_ACPI
+	if (!acpi_disabled)
+		acpi_dev_clear_dependencies(ACPI_COMPANION(dev));
+#endif
 	dev_info(dev, "mailbox registered with %d channels\n",
 		 mbox->channel_count);
 	return 0;
@@ -989,10 +1003,19 @@ static const struct of_device_id mpxy_mbox_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, mpxy_mbox_of_match);
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id mpxy_mbox_acpi_match[] = {
+	{ "RSCV0005", 0 },
+	{}
+};
+MODULE_DEVICE_TABLE(acpi, mpxy_mbox_acpi_match);
+#endif
+
 static struct platform_driver mpxy_mbox_driver = {
 	.driver = {
 		.name = "riscv-sbi-mpxy-mbox",
 		.of_match_table = mpxy_mbox_of_match,
+		.acpi_match_table = ACPI_PTR(mpxy_mbox_acpi_match),
 	},
 	.probe = mpxy_mbox_probe,
 	.remove = mpxy_mbox_remove,
-- 
2.43.0