From: Sudeep Holla <sudeep.holla@kernel.org>
Date: Fri, 8 May 2026 17:54:17 +0000 (+0100)
Subject: firmware: arm_ffa: Set the core device as FF-A device parent
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7fe2ec9fb8e9a78dad8d6b1e551cb4d126e36f1e;p=thirdparty%2Fkernel%2Flinux.git

firmware: arm_ffa: Set the core device as FF-A device parent

Pass a parent device into ffa_device_register() and use the synthetic
arm-ffa platform device as the parent for each registered FF-A device.

This keeps the enumerated FF-A partition devices anchored below the FF-A
core device in the driver model, matching the platform-driver conversion
of the core transport.

Suggested-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Link: https://patch.msgid.link/20260508-b4-ffa_plat_dev-v1-3-c5a30f8cf7b8@kernel.org
Signed-off-by: Sudeep Holla <sudeep.holla@kernel.org>
---

diff --git a/drivers/firmware/arm_ffa/bus.c b/drivers/firmware/arm_ffa/bus.c
index 601c3418e0d92..4df5c3b3fe434 100644
--- a/drivers/firmware/arm_ffa/bus.c
+++ b/drivers/firmware/arm_ffa/bus.c
@@ -192,7 +192,7 @@ bool ffa_device_is_valid(struct ffa_device *ffa_dev)
 
 struct ffa_device *
 ffa_device_register(const struct ffa_partition_info *part_info,
-		    const struct ffa_ops *ops)
+		    const struct ffa_ops *ops, struct device *parent)
 {
 	int id, ret;
 	struct device *dev;
@@ -212,6 +212,7 @@ ffa_device_register(const struct ffa_partition_info *part_info,
 	}
 
 	dev = &ffa_dev->dev;
+	dev->parent = parent;
 	dev->bus = &ffa_bus_type;
 	dev->release = ffa_release_device;
 	dev->dma_mask = &dev->coherent_dma_mask;
diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index dd74f6c79749b..4bb6b13849783 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -1738,7 +1738,7 @@ static int ffa_setup_host_partition(int vm_id)
 	int ret;
 
 	buf.id = vm_id;
-	ffa_dev = ffa_device_register(&buf, &ffa_drv_ops);
+	ffa_dev = ffa_device_register(&buf, &ffa_drv_ops, &ffa_pdev->dev);
 	if (!ffa_dev) {
 		pr_err("%s: failed to register host partition ID 0x%x\n",
 		       __func__, vm_id);
@@ -1813,7 +1813,8 @@ static int ffa_setup_partitions(void)
 		 * provides UUID here for each partition as part of the
 		 * discovery API and the same is passed.
 		 */
-		ffa_dev = ffa_device_register(tpbuf, &ffa_drv_ops);
+		ffa_dev = ffa_device_register(tpbuf, &ffa_drv_ops,
+					      &ffa_pdev->dev);
 		if (!ffa_dev) {
 			pr_err("%s: failed to register partition ID 0x%x\n",
 			       __func__, tpbuf->id);
diff --git a/include/linux/arm_ffa.h b/include/linux/arm_ffa.h
index 81e603839c4a5..17eca3dfc59e2 100644
--- a/include/linux/arm_ffa.h
+++ b/include/linux/arm_ffa.h
@@ -173,7 +173,7 @@ struct ffa_partition_info;
 #if IS_REACHABLE(CONFIG_ARM_FFA_TRANSPORT)
 struct ffa_device *
 ffa_device_register(const struct ffa_partition_info *part_info,
-		    const struct ffa_ops *ops);
+		    const struct ffa_ops *ops, struct device *parent);
 void ffa_device_unregister(struct ffa_device *ffa_dev);
 int ffa_driver_register(struct ffa_driver *driver, struct module *owner,
 			const char *mod_name);
@@ -184,7 +184,7 @@ bool ffa_device_is_valid(struct ffa_device *ffa_dev);
 #else
 static inline struct ffa_device *
 ffa_device_register(const struct ffa_partition_info *part_info,
-		    const struct ffa_ops *ops)
+		    const struct ffa_ops *ops, struct device *parent)
 {
 	return NULL;
 }