mailbox/riscv-sbi-mpxy: Add ACPI support

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

Acked-by: Jassi Brar <jassisinghbrar@gmail.com>
Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Link: https://lore.kernel.org/r/20250818040920.272664-22-apatel@ventanamicro.com
Signed-off-by: Paul Walmsley <pjw@kernel.org>

diff --git a/drivers/mailbox/riscv-sbi-mpxy-mbox.c b/drivers/mailbox/riscv-sbi-mpxy-mbox.c
index 21404baa6df0492346a617849fbd122f889eb75b..7c9c006b7244a59d6fee3222a0d5534a1a5199a2 100644 (file)
--- 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>
@@ -906,6 +908,8 @@ 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
@@ -913,8 +917,15 @@ 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;
@@ -960,6 +971,13 @@ 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;
@@ -979,10 +997,17 @@ 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,