wifi: ath: Use of_reserved_mem_region_to_resource() for "memory-region"

index f0713bd36173..b3f6424c17d3 100644
@@ -13,7 +13,7 @@
 #include <linux/property.h>
 #include <linux/regulator/consumer.h>
 #include <linux/remoteproc/qcom_rproc.h>
-#include <linux/of_address.h>
+#include <linux/of_reserved_mem.h>
 #include <linux/iommu.h>
 
 #include "ce.h"

@@ -1559,19 +1559,11 @@ static void ath10k_modem_deinit(struct ath10k *ar)
 static int ath10k_setup_msa_resources(struct ath10k *ar, u32 msa_size)
 {
 	struct device *dev = ar->dev;
-	struct device_node *node;
 	struct resource r;
 	int ret;
 
-	node = of_parse_phandle(dev->of_node, "memory-region", 0);
-	if (node) {
-		ret = of_address_to_resource(node, 0, &r);
-		of_node_put(node);
-		if (ret) {
-			dev_err(dev, "failed to resolve msa fixed region\n");
-			return ret;
-		}
-
+	ret = of_reserved_mem_region_to_resource(dev->of_node, 0, &r);
+	if (!ret) {
 		ar->msa.paddr = r.start;
 		ar->msa.mem_size = resource_size(&r);
 		ar->msa.vaddr = devm_memremap(dev, ar->msa.paddr,

index 50809cc1dad4..8dfe9b40c126 100644
@@ -9,8 +9,8 @@
 #include <linux/property.h>
 #include <linux/of_device.h>
 #include <linux/of.h>
+#include <linux/of_reserved_mem.h>
 #include <linux/dma-mapping.h>
-#include <linux/of_address.h>
 #include <linux/iommu.h>
 #include "ahb.h"
 #include "debug.h"

@@ -919,16 +919,10 @@ static int ath11k_ahb_setup_msa_resources(struct ath11k_base *ab)
 {
 	struct ath11k_ahb *ab_ahb = ath11k_ahb_priv(ab);
 	struct device *dev = ab->dev;
-	struct device_node *node;
 	struct resource r;
 	int ret;
 
-	node = of_parse_phandle(dev->of_node, "memory-region", 0);
-	if (!node)
-		return -ENOENT;
-
-	ret = of_address_to_resource(node, 0, &r);
-	of_node_put(node);
+	ret = of_reserved_mem_region_to_resource(dev->of_node, 0, &r);
 	if (ret) {
 		dev_err(dev, "failed to resolve msa fixed region\n");
 		return ret;

@@ -937,12 +931,7 @@ static int ath11k_ahb_setup_msa_resources(struct ath11k_base *ab)
 	ab_ahb->fw.msa_paddr = r.start;
 	ab_ahb->fw.msa_size = resource_size(&r);
 
-	node = of_parse_phandle(dev->of_node, "memory-region", 1);
-	if (!node)
-		return -ENOENT;
-
-	ret = of_address_to_resource(node, 0, &r);
-	of_node_put(node);
+	ret = of_reserved_mem_region_to_resource(dev->of_node, 1, &r);
 	if (ret) {
 		dev_err(dev, "failed to resolve ce fixed region\n");
 		return ret;

index 378ac96b861b..2b547b26ed20 100644
@@ -13,7 +13,7 @@
 #include "debug.h"
 #include "hif.h"
 #include <linux/of.h>
-#include <linux/of_address.h>
+#include <linux/of_reserved_mem.h>
 #include <linux/ioport.h>
 #include <linux/firmware.h>
 #include <linux/of_irq.h>

@@ -2040,23 +2040,14 @@ static int ath11k_qmi_alloc_target_mem_chunk(struct ath11k_base *ab)
 static int ath11k_qmi_assign_target_mem_chunk(struct ath11k_base *ab)
 {
 	struct device *dev = ab->dev;
-	struct device_node *hremote_node = NULL;
-	struct resource res;
+	struct resource res = {};
 	u32 host_ddr_sz;
 	int i, idx, ret;
 
 	for (i = 0, idx = 0; i < ab->qmi.mem_seg_count; i++) {
 		switch (ab->qmi.target_mem[i].type) {
 		case HOST_DDR_REGION_TYPE:
-			hremote_node = of_parse_phandle(dev->of_node, "memory-region", 0);
-			if (!hremote_node) {
-				ath11k_dbg(ab, ATH11K_DBG_QMI,
-					   "fail to get hremote_node\n");
-				return -ENODEV;
-			}
-
-			ret = of_address_to_resource(hremote_node, 0, &res);
-			of_node_put(hremote_node);
+			ret = of_reserved_mem_region_to_resource(dev->of_node, 0, &res);
 			if (ret) {
 				ath11k_dbg(ab, ATH11K_DBG_QMI,
 					   "fail to get reg from hremote\n");

@@ -2095,7 +2086,7 @@ static int ath11k_qmi_assign_target_mem_chunk(struct ath11k_base *ab)
 			}
 
 			if (ath11k_core_coldboot_cal_support(ab)) {
-				if (hremote_node) {
+				if (resource_size(&res)) {
 					ab->qmi.target_mem[idx].paddr =
 							res.start + host_ddr_sz;
 					ab->qmi.target_mem[idx].iaddr =