[PATCH RFC 11/15] arm_mpam: Fix mpam_dt_create_foundling_msc() to create MSC platform devices

[Yin Li]

The original code created a platform device for the cache node itself
rather than for the MSC, so the MSC was never created. Instead, walk
the cache's children using for_each_child_of_node_scoped() and create
the platform device for the MSC child node, skipping cache parents
that firmware has marked disabled.

Co-developed-by: Huang Yiwei <huang.yiwei@xxxxxxxxxxxxxxxx>
Signed-off-by: Huang Yiwei <huang.yiwei@xxxxxxxxxxxxxxxx>
Signed-off-by: Yin Li <yin.li@xxxxxxxxxxxxxxxx>
---
 drivers/resctrl/mpam_devices.c | 27 ++++++++++++---------------
 1 file changed, 12 insertions(+), 15 deletions(-)

diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c
index b0e67c8349c7..eac3bc695fd1 100644
--- a/drivers/resctrl/mpam_devices.c
+++ b/drivers/resctrl/mpam_devices.c
@@ -2358,23 +2358,20 @@ static struct platform_driver mpam_msc_driver = {
  */
 static void mpam_dt_create_foundling_msc(void)
 {
-	struct platform_device *pdev;
-	struct device_node *cache;
-
-	for_each_compatible_node(cache, NULL, "cache") {
-		struct device_node *cache_device;
-
-		if (of_node_check_flag(cache, OF_POPULATED))
-			continue;
-
-		cache_device = of_find_matching_node_and_match(cache, mpam_of_match, NULL);
-		if (!cache_device)
+	for_each_compatible_node_scoped(cache, NULL, "cache") {
+		if (!of_device_is_available(cache))
 			continue;
-		of_node_put(cache_device);
 
-		pdev = of_platform_device_create(cache, "cache", NULL);
-		if (!pdev)
-			pr_err_once("Failed to create MSC devices under caches\n");
+		for_each_child_of_node_scoped(cache, child) {
+			if (!of_match_node(mpam_of_match, child))
+				continue;
+			if (!of_device_is_available(child))
+				continue;
+			if (of_node_check_flag(child, OF_POPULATED))
+				continue;
+			if (!of_platform_device_create(child, NULL, NULL))
+				pr_err("Failed to create MSC device for %pOF\n", child);
+		}
 	}
 }
 

-- 
2.34.1