Merge branch 'icc-mtk' into icc-next

This series is a combination of binding changes, driver cleanups and new
driver code to enable the interconnect on the MediaTek MT8196 SoC.

* icc-mtk
  dt-bindings: interconnect: mt8183-emi: Add support for MT8196 EMI
  interconnect: mediatek: Add support for MediaTek MT8196 EMI ICC
  interconnect: mediatek: Don't hijack parent device
  interconnect: mediatek: Aggregate bandwidth with saturating add

Link: https://lore.kernel.org/r/20251124-mt8196-dvfsrc-v2-0-d9c1334db9f3@collabora.com
Signed-off-by: Georgi Djakov <djakov@kernel.org>

Author: Georgi Djakov

Documentation/devicetree/bindings/interconnect/mediatek,mt8183-emi.yaml

@@ -40,6 +40,7 @@ properties:
     enum:
       - mediatek,mt8183-emi
       - mediatek,mt8195-emi
+      - mediatek,mt8196-emi
 
   '#interconnect-cells':
     const: 1

drivers/interconnect/mediatek/Kconfig

@@ -27,3 +27,10 @@ config INTERCONNECT_MTK_MT8195
 	help
 	  This is a driver for the MediaTek bus interconnect on MT8195-based
 	  platforms.
+
+config INTERCONNECT_MTK_MT8196
+	tristate "MediaTek MT8196 interconnect driver"
+	depends on INTERCONNECT_MTK_DVFSRC_EMI
+	help
+	  This is a driver for the MediaTek bus interconnect on MT8196-based
+	  platforms.

drivers/interconnect/mediatek/Makefile

@@ -3,3 +3,4 @@
 obj-$(CONFIG_INTERCONNECT_MTK_DVFSRC_EMI) += icc-emi.o
 obj-$(CONFIG_INTERCONNECT_MTK_MT8183) += mt8183.o
 obj-$(CONFIG_INTERCONNECT_MTK_MT8195) += mt8195.o
+obj-$(CONFIG_INTERCONNECT_MTK_MT8195) += mt8196.o

drivers/interconnect/mediatek/icc-emi.c

@@ -12,6 +12,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
+#include <linux/overflow.h>
 #include <linux/platform_device.h>
 #include <linux/soc/mediatek/dvfsrc.h>
 
@@ -22,7 +23,9 @@ static int mtk_emi_icc_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
 {
 	struct mtk_icc_node *in = node->data;
 
-	*agg_avg += avg_bw;
+	if (check_add_overflow(*agg_avg, avg_bw, agg_avg))
+		*agg_avg = U32_MAX;
+
 	*agg_peak = max_t(u32, *agg_peak, peak_bw);
 
 	in->sum_avg = *agg_avg;
@@ -40,7 +43,7 @@ static int mtk_emi_icc_set(struct icc_node *src, struct icc_node *dst)
 	if (unlikely(!src->provider))
 		return -EINVAL;
 
-	dev = src->provider->dev;
+	dev = src->provider->dev->parent;
 
 	switch (node->ep) {
 	case 0:
@@ -97,7 +100,7 @@ int mtk_emi_icc_probe(struct platform_device *pdev)
 	if (!data)
 		return -ENOMEM;
 
-	provider->dev = pdev->dev.parent;
+	provider->dev = dev;
 	provider->set = mtk_emi_icc_set;
 	provider->aggregate = mtk_emi_icc_aggregate;
 	provider->xlate = of_icc_xlate_onecell;