[PATCH v2 7/9] firmware: arm_scmi: Refactor protocol device creation logic

[Sudeep Holla <sudeep.holla@kernel.org>]

Refactor the protocol validation and device creation logic in
scmi_probe() into a new helper function, scmi_device_check_create(),
to improve readability and reduce code duplication.

The new helper consolidates checks for protocol ID range, implementation
availability, and duplicate activation, before invoking
scmi_create_protocol_devices(). This refactor simplifies the SCMI probe
path while preserving existing behavior.

No functional changes intended. This refactoring is required to enable
ACPI PCC transport.

Signed-off-by: Sudeep Holla <sudeep.holla@kernel.org>
---
 drivers/firmware/arm_scmi/driver.c | 56 ++++++++++++++++++++++----------------
 1 file changed, 33 insertions(+), 23 deletions(-)

diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index 02f14167c918..47f13409dfeb 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -3181,6 +3181,38 @@ static void scmi_enable_matching_quirks(struct scmi_info *info)
 			   rev->sub_vendor_id, rev->impl_ver);
 }
 
+static void scmi_device_check_create(struct fwnode_handle *fwnode, int prot_id,
+				     struct scmi_info *info)
+{
+	int ret;
+	struct device *dev = info->dev;
+	struct scmi_handle *handle = &info->handle;
+
+	if (!FIELD_FIT(MSG_PROTOCOL_ID_MASK, prot_id))
+		dev_err(dev, "Out of range protocol %d\n", prot_id);
+
+	if (!scmi_is_protocol_implemented(handle, prot_id)) {
+		dev_err(dev, "SCMI protocol %d not implemented\n",
+			prot_id);
+		return;
+	}
+
+	/*
+	 * Save this valid fwnode protocol descriptor amongst
+	 * @active_protocols for this SCMI instance.
+	 */
+	ret = idr_alloc(&info->active_protocols, fwnode,
+			prot_id, prot_id + 1, GFP_KERNEL);
+	if (ret != prot_id) {
+		dev_err(dev, "SCMI protocol %d already activated. Skip\n",
+			prot_id);
+		return;
+	}
+
+	fwnode_handle_get(fwnode);
+	scmi_create_protocol_devices(fwnode, info, prot_id, NULL);
+}
+
 static int scmi_probe(struct platform_device *pdev)
 {
 	int ret;
@@ -3309,29 +3341,7 @@ static int scmi_probe(struct platform_device *pdev)
 		if (fwnode_property_read_u32(child, "reg", &prot_id))
 			continue;
 
-		if (!FIELD_FIT(MSG_PROTOCOL_ID_MASK, prot_id))
-			dev_err(dev, "Out of range protocol %d\n", prot_id);
-
-		if (!scmi_is_protocol_implemented(handle, prot_id)) {
-			dev_err(dev, "SCMI protocol %d not implemented\n",
-				prot_id);
-			continue;
-		}
-
-		/*
-		 * Save this valid fwnode protocol descriptor amongst
-		 * @active_protocols for this SCMI instance.
-		 */
-		ret = idr_alloc(&info->active_protocols, child,
-				prot_id, prot_id + 1, GFP_KERNEL);
-		if (ret != prot_id) {
-			dev_err(dev, "SCMI protocol %d already activated. Skip\n",
-				prot_id);
-			continue;
-		}
-
-		fwnode_handle_get(child);
-		scmi_create_protocol_devices(child, info, prot_id, NULL);
+		scmi_device_check_create(child, prot_id, info);
 	}
 
 	return 0;

-- 
2.43.0