From cf3179b4e53f527aba9f0c6c3b921619c8adf761 Mon Sep 17 00:00:00 2001
From: Marc Zyngier <maz@kernel.org>
Date: Tue, 24 Feb 2026 10:09:33 +0000
Subject: [PATCH] irqchip/gic-v3-its: Add fsl_mc device plumbing to the
 msi-parent handling

Make the ITS code aware of fsl_mc devices by plumbing the devid
retrieval primitive.

Reviewed-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Tested-by: Ioana Ciornei <ioana.ciornei@nxp.com> # LX2160ARDB, LS2088ARDB
Tested-by: Sascha Bischoff <sascha.bischoff@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Thomas Gleixner <tglx@kernel.org>
Link: https://lore.kernel.org/r/20260224100936.3752303-4-maz@kernel.org
Signed-off-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
---
 drivers/irqchip/irq-gic-its-msi-parent.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-gic-its-msi-parent.c b/drivers/irqchip/irq-gic-its-msi-parent.c
index a832cdb2e697..d36b278ae66c 100644
--- a/drivers/irqchip/irq-gic-its-msi-parent.c
+++ b/drivers/irqchip/irq-gic-its-msi-parent.c
@@ -5,6 +5,7 @@
 // Copyright (C) 2022 Intel
 
 #include <linux/acpi_iort.h>
+#include <linux/fsl/mc.h>
 #include <linux/of_address.h>
 #include <linux/pci.h>
 
@@ -187,9 +188,11 @@ static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev,
 {
 	struct msi_domain_info *msi_info;
 	u32 dev_id;
-	int ret;
+	int ret = 0;
 
-	if (dev->of_node)
+	if (dev_is_fsl_mc(dev))
+		dev_id = fsl_mc_get_msi_id(dev);
+	else if (dev->of_node)
 		ret = of_pmsi_get_msi_info(domain->parent, dev, &dev_id, NULL);
 	else
 		ret = iort_pmsi_get_msi_info(dev, &dev_id, NULL);