mediatek: filogic: move ilm, dlm and cpu_boot in dedicated nodes

This fixes issues with legacy boot loaders that don't process reserved memory
regions outside of system RAM

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

7 files changed, 522 insertions, 0 deletions

diff --git a/target/linux/mediatek/patches-5.15/940-net-ethernet-mtk_wed-rename-mtk_wed_get_memory_regio.patch b/target/linux/mediatek/patches-5.15/940-net-ethernet-mtk_wed-rename-mtk_wed_get_memory_regio.patch
new file mode 100644
index 0000000000..2fe565f3b2
--- /dev/null
+++ b/target/linux/mediatek/patches-5.15/940-net-ethernet-mtk_wed-rename-mtk_wed_get_memory_regio.patch
@@ -0,0 +1,44 @@
+From 3cf212c4ce6cd72c09bc47f35f539ba0afd4d106 Mon Sep 17 00:00:00 2001
+Message-Id: <3cf212c4ce6cd72c09bc47f35f539ba0afd4d106.1678716918.git.lorenzo@kernel.org>
+From: Lorenzo Bianconi <lorenzo@kernel.org>
+Date: Sun, 12 Mar 2023 16:40:31 +0100
+Subject: [PATCH net-next 1/2] net: ethernet: mtk_wed: rename
+ mtk_wed_get_memory_region in mtk_wed_get_reserved_memory_region
+
+This is a preliminary patch to move wed ilm/dlm and cpuboot properties in
+dedicated dts nodes.
+
+Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
+---
+ drivers/net/ethernet/mediatek/mtk_wed_mcu.c | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+--- a/drivers/net/ethernet/mediatek/mtk_wed_mcu.c
++++ b/drivers/net/ethernet/mediatek/mtk_wed_mcu.c
+@@ -215,8 +215,8 @@ int mtk_wed_mcu_msg_update(struct mtk_we
+ }
+ 
+ static int
+-mtk_wed_get_memory_region(struct mtk_wed_wo *wo,
+-			  struct mtk_wed_wo_memory_region *region)
++mtk_wed_get_reserved_memory_region(struct mtk_wed_wo *wo,
++				   struct mtk_wed_wo_memory_region *region)
+ {
+ 	struct reserved_mem *rmem;
+ 	struct device_node *np;
+@@ -311,13 +311,13 @@ mtk_wed_mcu_load_firmware(struct mtk_wed
+ 
+ 	/* load firmware region metadata */
+ 	for (i = 0; i < ARRAY_SIZE(mem_region); i++) {
+-		ret = mtk_wed_get_memory_region(wo, &mem_region[i]);
++		ret = mtk_wed_get_reserved_memory_region(wo, &mem_region[i]);
+ 		if (ret)
+ 			return ret;
+ 	}
+ 
+ 	wo->boot.name = "wo-boot";
+-	ret = mtk_wed_get_memory_region(wo, &wo->boot);
++	ret = mtk_wed_get_reserved_memory_region(wo, &wo->boot);
+ 	if (ret)
+ 		return ret;
+ 
diff --git a/target/linux/mediatek/patches-5.15/941-arm64-dts-mt7986-move-cpuboot-in-a-dedicated-node.patch b/target/linux/mediatek/patches-5.15/941-arm64-dts-mt7986-move-cpuboot-in-a-dedicated-node.patch
new file mode 100644
index 0000000000..2d2871772d
--- /dev/null
+++ b/target/linux/mediatek/patches-5.15/941-arm64-dts-mt7986-move-cpuboot-in-a-dedicated-node.patch
@@ -0,0 +1,65 @@
+From 247e566e3459481f1fa98733534bfed767e18b42 Mon Sep 17 00:00:00 2001
+Message-Id: <247e566e3459481f1fa98733534bfed767e18b42.1678620342.git.lorenzo@kernel.org>
+From: Lorenzo Bianconi <lorenzo@kernel.org>
+Date: Sat, 11 Mar 2023 16:32:41 +0100
+Subject: [PATCH net-next] arm64: dts: mt7986: move cpuboot in a dedicated node
+
+Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
+---
+ arch/arm64/boot/dts/mediatek/mt7986a.dtsi | 21 +++++++++++----------
+ 1 file changed, 11 insertions(+), 10 deletions(-)
+
+--- a/arch/arm64/boot/dts/mediatek/mt7986a.dtsi
++++ b/arch/arm64/boot/dts/mediatek/mt7986a.dtsi
+@@ -121,11 +121,6 @@
+ 			reg = <0 0x151f8000 0 0x2000>;
+ 			no-map;
+ 		};
+-
+-		wo_boot: wo-boot@15194000 {
+-			reg = <0 0x15194000 0 0x1000>;
+-			no-map;
+-		};
+ 	};
+ 
+ 	timer {
+@@ -625,10 +620,11 @@
+ 			interrupt-parent = <&gic>;
+ 			interrupts = <GIC_SPI 205 IRQ_TYPE_LEVEL_HIGH>;
+ 			memory-region = <&wo_emi0>, <&wo_ilm0>, <&wo_dlm0>,
+-					<&wo_data>, <&wo_boot>;
++					<&wo_data>;
+ 			memory-region-names = "wo-emi", "wo-ilm", "wo-dlm",
+-					      "wo-data", "wo-boot";
++					      "wo-data";
+ 			mediatek,wo-ccif = <&wo_ccif0>;
++			mediatek,wo-cpuboot = <&wo_cpuboot>;
+ 		};
+ 
+ 		wed1: wed@15011000 {
+@@ -638,10 +634,11 @@
+ 			interrupt-parent = <&gic>;
+ 			interrupts = <GIC_SPI 206 IRQ_TYPE_LEVEL_HIGH>;
+ 			memory-region = <&wo_emi1>, <&wo_ilm1>, <&wo_dlm1>,
+-					<&wo_data>, <&wo_boot>;
++					<&wo_data>;
+ 			memory-region-names = "wo-emi", "wo-ilm", "wo-dlm",
+-					      "wo-data", "wo-boot";
++					      "wo-data";
+ 			mediatek,wo-ccif = <&wo_ccif1>;
++			mediatek,wo-cpuboot = <&wo_cpuboot>;
+ 		};
+ 
+ 		wo_ccif0: syscon@151a5000 {
+@@ -658,6 +655,11 @@
+ 			interrupts = <GIC_SPI 212 IRQ_TYPE_LEVEL_HIGH>;
+ 		};
+ 
++		wo_cpuboot: syscon@15194000 {
++			compatible = "mediatek,mt7986-wo-cpuboot", "syscon";
++			reg = <0 0x15194000 0 0x1000>;
++		};
++
+ 		eth: ethernet@15100000 {
+ 			compatible = "mediatek,mt7986-eth";
+ 			reg = <0 0x15100000 0 0x80000>;
diff --git a/target/linux/mediatek/patches-5.15/942-net-ethernet-mtk_wed-move-cpuboot-in-a-dedicated-dts.patch b/target/linux/mediatek/patches-5.15/942-net-ethernet-mtk_wed-move-cpuboot-in-a-dedicated-dts.patch
new file mode 100644
index 0000000000..57f8afe474
--- /dev/null
+++ b/target/linux/mediatek/patches-5.15/942-net-ethernet-mtk_wed-move-cpuboot-in-a-dedicated-dts.patch
@@ -0,0 +1,96 @@
+From f292d1bf83ec160bef2532b58aa08f5b71041923 Mon Sep 17 00:00:00 2001
+Message-Id: <f292d1bf83ec160bef2532b58aa08f5b71041923.1678716918.git.lorenzo@kernel.org>
+In-Reply-To: <3cf212c4ce6cd72c09bc47f35f539ba0afd4d106.1678716918.git.lorenzo@kernel.org>
+References: <3cf212c4ce6cd72c09bc47f35f539ba0afd4d106.1678716918.git.lorenzo@kernel.org>
+From: Lorenzo Bianconi <lorenzo@kernel.org>
+Date: Sat, 11 Mar 2023 18:13:04 +0100
+Subject: [PATCH net-next 2/2] net: ethernet: mtk_wed: move cpuboot in a
+ dedicated dts node
+
+Since the cpuboot memory region is not part of the RAM SoC, move cpuboot
+in a deidicated syscon node.
+This patch helps to keep backward-compatibility with older version of
+uboot codebase where we have a limit of 8 reserved-memory dts child
+nodes.
+Keep backward-compatibility with older dts version where cpuboot was
+defined as reserved-memory child node.
+
+Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
+---
+ drivers/net/ethernet/mediatek/mtk_wed_mcu.c | 34 +++++++++++++++++----
+ drivers/net/ethernet/mediatek/mtk_wed_wo.h  |  3 +-
+ 2 files changed, 30 insertions(+), 7 deletions(-)
+
+diff --git a/drivers/net/ethernet/mediatek/mtk_wed_mcu.c b/drivers/net/ethernet/mediatek/mtk_wed_mcu.c
+index 6624f6d6abdd..797c3b412ab6 100644
+--- a/drivers/net/ethernet/mediatek/mtk_wed_mcu.c
++++ b/drivers/net/ethernet/mediatek/mtk_wed_mcu.c
+@@ -18,12 +18,23 @@
+ 
+ static u32 wo_r32(struct mtk_wed_wo *wo, u32 reg)
+ {
+-	return readl(wo->boot.addr + reg);
++	u32 val;
++
++	if (!wo->boot_regmap)
++		return readl(wo->boot.addr + reg);
++
++	if (regmap_read(wo->boot_regmap, reg, &val))
++		val = ~0;
++
++	return val;
+ }
+ 
+ static void wo_w32(struct mtk_wed_wo *wo, u32 reg, u32 val)
+ {
+-	writel(val, wo->boot.addr + reg);
++	if (wo->boot_regmap)
++		regmap_write(wo->boot_regmap, reg, val);
++	else
++		writel(val, wo->boot.addr + reg);
+ }
+ 
+ static struct sk_buff *
+@@ -316,10 +327,21 @@ mtk_wed_mcu_load_firmware(struct mtk_wed_wo *wo)
+ 			return ret;
+ 	}
+ 
+-	wo->boot.name = "wo-boot";
+-	ret = mtk_wed_get_reserved_memory_region(wo, &wo->boot);
+-	if (ret)
+-		return ret;
++	wo->boot_regmap = syscon_regmap_lookup_by_phandle(wo->hw->node,
++							  "mediatek,wo-cpuboot");
++	if (IS_ERR(wo->boot_regmap)) {
++		if (wo->boot_regmap != ERR_PTR(-ENODEV))
++			return PTR_ERR(wo->boot_regmap);
++
++		/* For backward compatibility, we need to check if cpu_boot
++		 * is defined through reserved memory property.
++		 */
++		wo->boot_regmap = NULL;
++		wo->boot.name = "wo-boot";
++		ret = mtk_wed_get_reserved_memory_region(wo, &wo->boot);
++		if (ret)
++			return ret;
++	}
+ 
+ 	/* set dummy cr */
+ 	wed_w32(wo->hw->wed_dev, MTK_WED_SCR0 + 4 * MTK_WED_DUMMY_CR_FWDL,
+diff --git a/drivers/net/ethernet/mediatek/mtk_wed_wo.h b/drivers/net/ethernet/mediatek/mtk_wed_wo.h
+index dbcf42ce9173..c03071203cc0 100644
+--- a/drivers/net/ethernet/mediatek/mtk_wed_wo.h
++++ b/drivers/net/ethernet/mediatek/mtk_wed_wo.h
+@@ -227,7 +227,8 @@ struct mtk_wed_wo_queue {
+ 
+ struct mtk_wed_wo {
+ 	struct mtk_wed_hw *hw;
+-	struct mtk_wed_wo_memory_region boot;
++	struct mtk_wed_wo_memory_region boot; /* backward compatibility */
++	struct regmap *boot_regmap;
+ 
+ 	struct mtk_wed_wo_queue q_tx;
+ 	struct mtk_wed_wo_queue q_rx;
+-- 
+2.39.2
+
diff --git a/target/linux/mediatek/patches-5.15/943-net-ethernet-mtk_wed-move-ilm-a-dedicated-dts-node.patch b/target/linux/mediatek/patches-5.15/943-net-ethernet-mtk_wed-move-ilm-a-dedicated-dts-node.patch
new file mode 100644
index 0000000000..e83daeb9f0
--- /dev/null
+++ b/target/linux/mediatek/patches-5.15/943-net-ethernet-mtk_wed-move-ilm-a-dedicated-dts-node.patch
@@ -0,0 +1,96 @@
+From f3565e6c2276411275e707a5442d3f69cc111273 Mon Sep 17 00:00:00 2001
+Message-Id: <f3565e6c2276411275e707a5442d3f69cc111273.1678718888.git.lorenzo@kernel.org>
+From: Lorenzo Bianconi <lorenzo@kernel.org>
+Date: Sun, 12 Mar 2023 18:51:47 +0100
+Subject: [PATCH net-next 1/3] net: ethernet: mtk_wed: move ilm a dedicated dts
+ node
+
+Since the ilm memory region is not part of the RAM SoC, move ilm in a
+deidicated syscon node.
+This patch helps to keep backward-compatibility with older version of
+uboot codebase where we have a limit of 8 reserved-memory dts child
+nodes.
+Keep backward-compatibility with older dts version where ilm was defined
+as reserved-memory child node.
+
+Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
+---
+ drivers/net/ethernet/mediatek/mtk_wed_mcu.c | 55 ++++++++++++++++++---
+ 1 file changed, 49 insertions(+), 6 deletions(-)
+
+diff --git a/drivers/net/ethernet/mediatek/mtk_wed_mcu.c b/drivers/net/ethernet/mediatek/mtk_wed_mcu.c
+index 797c3b412ab6..976946a3653a 100644
+--- a/drivers/net/ethernet/mediatek/mtk_wed_mcu.c
++++ b/drivers/net/ethernet/mediatek/mtk_wed_mcu.c
+@@ -299,6 +299,52 @@ mtk_wed_mcu_run_firmware(struct mtk_wed_wo *wo, const struct firmware *fw,
+ 	return -EINVAL;
+ }
+ 
++static int
++mtk_wed_mcu_load_memory_regions(struct mtk_wed_wo *wo,
++				struct mtk_wed_wo_memory_region *region)
++{
++	struct device_node *np;
++	int ret;
++
++	/* firmware EMI memory region */
++	ret = mtk_wed_get_reserved_memory_region(wo,
++			&region[MTK_WED_WO_REGION_EMI]);
++	if (ret)
++		return ret;
++
++	/* firmware DATA memory region */
++	ret = mtk_wed_get_reserved_memory_region(wo,
++			&region[MTK_WED_WO_REGION_DATA]);
++	if (ret)
++		return ret;
++
++	np = of_parse_phandle(wo->hw->node, "mediatek,wo-ilm", 0);
++	if (np) {
++		struct mtk_wed_wo_memory_region *ilm_region;
++		struct resource res;
++
++		ret = of_address_to_resource(np, 0, &res);
++		of_node_put(np);
++
++		if (ret < 0)
++			return ret;
++
++		ilm_region = &region[MTK_WED_WO_REGION_ILM];
++		ilm_region->phy_addr = res.start;
++		ilm_region->size = resource_size(&res);
++		ilm_region->addr = devm_ioremap(wo->hw->dev, res.start,
++						resource_size(&res));
++
++		return IS_ERR(ilm_region->addr) ? PTR_ERR(ilm_region->addr) : 0;
++	}
++
++	/* For backward compatibility, we need to check if ILM
++	 * node is defined through reserved memory property.
++	 */
++	return mtk_wed_get_reserved_memory_region(wo,
++			&region[MTK_WED_WO_REGION_ILM]);
++}
++
+ static int
+ mtk_wed_mcu_load_firmware(struct mtk_wed_wo *wo)
+ {
+@@ -320,12 +366,9 @@ mtk_wed_mcu_load_firmware(struct mtk_wed_wo *wo)
+ 	u32 val, boot_cr;
+ 	int ret, i;
+ 
+-	/* load firmware region metadata */
+-	for (i = 0; i < ARRAY_SIZE(mem_region); i++) {
+-		ret = mtk_wed_get_reserved_memory_region(wo, &mem_region[i]);
+-		if (ret)
+-			return ret;
+-	}
++	ret = mtk_wed_mcu_load_memory_regions(wo, mem_region);
++	if (ret)
++		return ret;
+ 
+ 	wo->boot_regmap = syscon_regmap_lookup_by_phandle(wo->hw->node,
+ 							  "mediatek,wo-cpuboot");
+-- 
+2.39.2
+
diff --git a/target/linux/mediatek/patches-5.15/944-net-ethernet-mtk_wed-move-dlm-a-dedicated-dts-node.patch b/target/linux/mediatek/patches-5.15/944-net-ethernet-mtk_wed-move-dlm-a-dedicated-dts-node.patch
new file mode 100644
index 0000000000..fb3940f544
--- /dev/null
+++ b/target/linux/mediatek/patches-5.15/944-net-ethernet-mtk_wed-move-dlm-a-dedicated-dts-node.patch
@@ -0,0 +1,57 @@
+From b74ba226be2c45091b93bd49192bdd6d2178729e Mon Sep 17 00:00:00 2001
+Message-Id: <b74ba226be2c45091b93bd49192bdd6d2178729e.1678718888.git.lorenzo@kernel.org>
+In-Reply-To: <f3565e6c2276411275e707a5442d3f69cc111273.1678718888.git.lorenzo@kernel.org>
+References: <f3565e6c2276411275e707a5442d3f69cc111273.1678718888.git.lorenzo@kernel.org>
+From: Lorenzo Bianconi <lorenzo@kernel.org>
+Date: Mon, 13 Mar 2023 15:45:16 +0100
+Subject: [PATCH net-next 3/3] net: ethernet: mtk_wed: move dlm a dedicated dts
+ node
+
+Since the dlm memory region is not part of the RAM SoC, move dlm in a
+deidicated syscon node.
+This patch helps to keep backward-compatibility with older version of
+uboot codebase where we have a limit of 8 reserved-memory dts child
+nodes.
+Keep backward-compatibility with older dts version where dlm was defined
+as reserved-memory child node.
+
+Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
+---
+ drivers/net/ethernet/mediatek/mtk_wed.c | 19 +++++++++++++++++++
+ 1 file changed, 19 insertions(+)
+
+--- a/drivers/net/ethernet/mediatek/mtk_wed.c
++++ b/drivers/net/ethernet/mediatek/mtk_wed.c
+@@ -806,6 +806,24 @@ mtk_wed_rro_alloc(struct mtk_wed_device
+ 	struct device_node *np;
+ 	int index;
+ 
++	np = of_parse_phandle(dev->hw->node, "mediatek,wo-dlm", 0);
++	if (np) {
++		struct resource res;
++		int ret;
++
++		ret = of_address_to_resource(np, 0, &res);
++		of_node_put(np);
++
++		if (ret < 0)
++			return ret;
++
++		dev->rro.miod_phys = res.start;
++		goto out;
++	}
++
++	/* For backward compatibility, we need to check if DLM
++	 * node is defined through reserved memory property.
++	 */
+ 	index = of_property_match_string(dev->hw->node, "memory-region-names",
+ 					 "wo-dlm");
+ 	if (index < 0)
+@@ -822,6 +840,7 @@ mtk_wed_rro_alloc(struct mtk_wed_device
+ 		return -ENODEV;
+ 
+ 	dev->rro.miod_phys = rmem->base;
++out:
+ 	dev->rro.fdbk_phys = MTK_WED_MIOD_COUNT + dev->rro.miod_phys;
+ 
+ 	return mtk_wed_rro_ring_alloc(dev, &dev->rro.ring,
diff --git a/target/linux/mediatek/patches-5.15/945-arm64-dts-mt7986-move-ilm-in-a-dedicated-node.patch b/target/linux/mediatek/patches-5.15/945-arm64-dts-mt7986-move-ilm-in-a-dedicated-node.patch
new file mode 100644
index 0000000000..b640ed4b22
--- /dev/null
+++ b/target/linux/mediatek/patches-5.15/945-arm64-dts-mt7986-move-ilm-in-a-dedicated-node.patch
@@ -0,0 +1,83 @@
+From 01561065af5bf1d2a4244896d897e3a1eafbcd46 Mon Sep 17 00:00:00 2001
+Message-Id: <01561065af5bf1d2a4244896d897e3a1eafbcd46.1678717704.git.lorenzo@kernel.org>
+From: Lorenzo Bianconi <lorenzo@kernel.org>
+Date: Mon, 13 Mar 2023 15:10:56 +0100
+Subject: [PATCH net-next] arm64: dts: mt7986: move ilm in a dedicated node
+
+Since the ilm memory region is not part of the RAM SoC, move ilm in a
+deidicated syscon node.
+This patch helps to keep backward-compatibility with older version of
+uboot codebase where we have a limit of 8 reserved-memory dts child
+nodes.
+
+Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
+---
+ arch/arm64/boot/dts/mediatek/mt7986a.dtsi | 34 +++++++++++------------
+ 1 file changed, 16 insertions(+), 18 deletions(-)
+
+--- a/arch/arm64/boot/dts/mediatek/mt7986a.dtsi
++++ b/arch/arm64/boot/dts/mediatek/mt7986a.dtsi
+@@ -97,16 +97,6 @@
+ 			no-map;
+ 		};
+ 
+-		wo_ilm0: wo-ilm@151e0000 {
+-			reg = <0 0x151e0000 0 0x8000>;
+-			no-map;
+-		};
+-
+-		wo_ilm1: wo-ilm@151f0000 {
+-			reg = <0 0x151f0000 0 0x8000>;
+-			no-map;
+-		};
+-
+ 		wo_data: wo-data@4fd80000 {
+ 			reg = <0 0x4fd80000 0 0x240000>;
+ 			no-map;
+@@ -619,11 +609,10 @@
+ 			reg = <0 0x15010000 0 0x1000>;
+ 			interrupt-parent = <&gic>;
+ 			interrupts = <GIC_SPI 205 IRQ_TYPE_LEVEL_HIGH>;
+-			memory-region = <&wo_emi0>, <&wo_ilm0>, <&wo_dlm0>,
+-					<&wo_data>;
+-			memory-region-names = "wo-emi", "wo-ilm", "wo-dlm",
+-					      "wo-data";
++			memory-region = <&wo_emi0>, <&wo_dlm0>, <&wo_data>;
++			memory-region-names = "wo-emi", "wo-dlm", "wo-data";
+ 			mediatek,wo-ccif = <&wo_ccif0>;
++			mediatek,wo-ilm = <&wo_ilm0>;
+ 			mediatek,wo-cpuboot = <&wo_cpuboot>;
+ 		};
+ 
+@@ -633,11 +622,10 @@
+ 			reg = <0 0x15011000 0 0x1000>;
+ 			interrupt-parent = <&gic>;
+ 			interrupts = <GIC_SPI 206 IRQ_TYPE_LEVEL_HIGH>;
+-			memory-region = <&wo_emi1>, <&wo_ilm1>, <&wo_dlm1>,
+-					<&wo_data>;
+-			memory-region-names = "wo-emi", "wo-ilm", "wo-dlm",
+-					      "wo-data";
++			memory-region = <&wo_emi1>, <&wo_dlm1>, <&wo_data>;
++			memory-region-names = "wo-emi", "wo-dlm", "wo-data";
+ 			mediatek,wo-ccif = <&wo_ccif1>;
++			mediatek,wo-ilm = <&wo_ilm1>;
+ 			mediatek,wo-cpuboot = <&wo_cpuboot>;
+ 		};
+ 
+@@ -655,6 +643,16 @@
+ 			interrupts = <GIC_SPI 212 IRQ_TYPE_LEVEL_HIGH>;
+ 		};
+ 
++		wo_ilm0: syscon@151e0000 {
++			compatible = "mediatek,mt7986-wo-ilm", "syscon";
++			reg = <0 0x151e0000 0 0x8000>;
++		};
++
++		wo_ilm1: syscon@151f0000 {
++			compatible = "mediatek,mt7986-wo-ilm", "syscon";
++			reg = <0 0x151f0000 0 0x8000>;
++		};
++
+ 		wo_cpuboot: syscon@15194000 {
+ 			compatible = "mediatek,mt7986-wo-cpuboot", "syscon";
+ 			reg = <0 0x15194000 0 0x1000>;
diff --git a/target/linux/mediatek/patches-5.15/946-arm64-dts-mt7986-move-dlm-in-a-dedicated-node.patch b/target/linux/mediatek/patches-5.15/946-arm64-dts-mt7986-move-dlm-in-a-dedicated-node.patch
new file mode 100644
index 0000000000..0523ae009d
--- /dev/null
+++ b/target/linux/mediatek/patches-5.15/946-arm64-dts-mt7986-move-dlm-in-a-dedicated-node.patch
@@ -0,0 +1,81 @@
+From 9f76be683a8ec498563c294bc1cc279468058302 Mon Sep 17 00:00:00 2001
+Message-Id: <9f76be683a8ec498563c294bc1cc279468058302.1678719283.git.lorenzo@kernel.org>
+From: Lorenzo Bianconi <lorenzo@kernel.org>
+Date: Mon, 13 Mar 2023 15:53:30 +0100
+Subject: [PATCH net-next] arm64: dts: mt7986: move dlm in a dedicated node
+
+Since the dlm memory region is not part of the RAM SoC, move dlm in a
+deidicated syscon node.
+This patch helps to keep backward-compatibility with older version of
+uboot codebase where we have a limit of 8 reserved-memory dts child
+nodes.
+
+Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
+---
+ arch/arm64/boot/dts/mediatek/mt7986a.dtsi | 30 ++++++++++++-----------
+ 1 file changed, 16 insertions(+), 14 deletions(-)
+
+--- a/arch/arm64/boot/dts/mediatek/mt7986a.dtsi
++++ b/arch/arm64/boot/dts/mediatek/mt7986a.dtsi
+@@ -101,16 +101,6 @@
+ 			reg = <0 0x4fd80000 0 0x240000>;
+ 			no-map;
+ 		};
+-
+-		wo_dlm0: wo-dlm@151e8000 {
+-			reg = <0 0x151e8000 0 0x2000>;
+-			no-map;
+-		};
+-
+-		wo_dlm1: wo-dlm@151f8000 {
+-			reg = <0 0x151f8000 0 0x2000>;
+-			no-map;
+-		};
+ 	};
+ 
+ 	timer {
+@@ -609,10 +599,11 @@
+ 			reg = <0 0x15010000 0 0x1000>;
+ 			interrupt-parent = <&gic>;
+ 			interrupts = <GIC_SPI 205 IRQ_TYPE_LEVEL_HIGH>;
+-			memory-region = <&wo_emi0>, <&wo_dlm0>, <&wo_data>;
+-			memory-region-names = "wo-emi", "wo-dlm", "wo-data";
++			memory-region = <&wo_emi0>, <&wo_data>;
++			memory-region-names = "wo-emi", "wo-data";
+ 			mediatek,wo-ccif = <&wo_ccif0>;
+ 			mediatek,wo-ilm = <&wo_ilm0>;
++			mediatek,wo-dlm = <&wo_dlm0>;
+ 			mediatek,wo-cpuboot = <&wo_cpuboot>;
+ 		};
+ 
+@@ -622,10 +613,11 @@
+ 			reg = <0 0x15011000 0 0x1000>;
+ 			interrupt-parent = <&gic>;
+ 			interrupts = <GIC_SPI 206 IRQ_TYPE_LEVEL_HIGH>;
+-			memory-region = <&wo_emi1>, <&wo_dlm1>, <&wo_data>;
+-			memory-region-names = "wo-emi", "wo-dlm", "wo-data";
++			memory-region = <&wo_emi1>, <&wo_data>;
++			memory-region-names = "wo-emi", "wo-data";
+ 			mediatek,wo-ccif = <&wo_ccif1>;
+ 			mediatek,wo-ilm = <&wo_ilm1>;
++			mediatek,wo-dlm = <&wo_dlm1>;
+ 			mediatek,wo-cpuboot = <&wo_cpuboot>;
+ 		};
+ 
+@@ -653,6 +645,16 @@
+ 			reg = <0 0x151f0000 0 0x8000>;
+ 		};
+ 
++		wo_dlm0: syscon@151e8000 {
++			compatible = "mediatek,mt7986-wo-dlm", "syscon";
++			reg = <0 0x151e8000 0 0x2000>;
++		};
++
++		wo_dlm1: syscon@151f8000 {
++			compatible = "mediatek,mt7986-wo-dlm", "syscon";
++			reg = <0 0x151f8000 0 0x2000>;
++		};
++
+ 		wo_cpuboot: syscon@15194000 {
+ 			compatible = "mediatek,mt7986-wo-cpuboot", "syscon";
+ 			reg = <0 0x15194000 0 0x1000>;