[PATCH v2 0/4] riscv: dts: thead: Add Milk-V Meles support

[PATCH v2 0/4] riscv: dts: thead: Add Milk-V Meles support

[Han Gao]

Milk-V Meles is a single-board computer powered by T-HEAD's TH1520
SoC with four C910 RISC-V cores. Add the board compatible and device
tree for the Milk-V Meles.

Enable UART0, eMMC, microSD, Gigabit Ethernet and the PWM fan, and
name the GPIO lines exposed on the 40-pin header. Add AP6256 Wi-Fi
support over SDIO and enable HDMI output through the DC8200 display
controller and DW-HDMI transmitter.

Board details:
https://milkv.io/docs/meles/overview

Signed-off-by: Han Gao <gaohan@iscas.ac.cn>
---
Changes in v2:
- Group BeagleV Ahead and Milk-V Meles compatibles in a common TH1520
  enum, as requested by Krzysztof Kozlowski.
- Explicitly select the GPIO function for the Wi-Fi host-wake pin,
  as reported by Sashiko and confirmed by Drew Fustini.
- Add Drew Fustini's Reviewed-by tags to patches 2-4.
- Link to v1: https://lore.kernel.org/r/20260929-rv-meles-v1-0-effdd14a76e8@iscas.ac.cn

---
Han Gao (4):
      dt-bindings: riscv: thead: add Milk-V Meles
      riscv: dts: thead: add Milk-V Meles
      riscv: dts: thead: enable AP6256 Wi-Fi on Milk-V Meles
      riscv: dts: thead: enable HDMI on Milk-V Meles

 Documentation/devicetree/bindings/riscv/thead.yaml |   6 +-
 arch/riscv/boot/dts/thead/Makefile                 |   1 +
 arch/riscv/boot/dts/thead/th1520-milkv-meles.dts   | 346 +++++++++++++++++++++
 3 files changed, 351 insertions(+), 2 deletions(-)
---
base-commit: 72d3fcf802c45d00b300f25b848a93c3a2bd7c7e
change-id: 20260929-rv-meles-25d10148dc0c

Best regards,
-- 
Han Gao <gaohan@iscas.ac.cn>

[PATCH v2 1/4] dt-bindings: riscv: thead: add Milk-V Meles

[Han Gao]

Document the Milk-V Meles board compatible with the TH1520 fallback.

Signed-off-by: Han Gao <gaohan@iscas.ac.cn>
---
 Documentation/devicetree/bindings/riscv/thead.yaml | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/riscv/thead.yaml b/Documentation/devicetree/bindings/riscv/thead.yaml
index 301912dcd290e60f816d380152591106de9415b4..e8170915f4d6d63fbc10a0e6863ea7d5000e3643 100644
--- a/Documentation/devicetree/bindings/riscv/thead.yaml
+++ b/Documentation/devicetree/bindings/riscv/thead.yaml
@@ -17,9 +17,11 @@ properties:
     const: '/'
   compatible:
     oneOf:
-      - description: BeagleV Ahead single board computer
+      - description: TH1520 single board computers
         items:
-          - const: beagle,beaglev-ahead
+          - enum:
+              - beagle,beaglev-ahead
+              - milkv,meles
           - const: thead,th1520
       - description: Sipeed Lichee Pi 4A board for the Sipeed Lichee Module 4A
         items:

-- 
2.47.3

Re: [PATCH v2 1/4] dt-bindings: riscv: thead: add Milk-V Meles

[Conor Dooley]

[-- Attachment #1: Type: text/plain, Size: 75 bytes --]

Acked-by: Conor Dooley <conor.dooley@microchip.com>
pw-bot: not-applicable

[-- Attachment #2: signature.asc --]
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Re: [PATCH v2 1/4] dt-bindings: riscv: thead: add Milk-V Meles

[Drew Fustini]

On Thu, Oct 01, 2026 at 03:44:10PM +0800, Han Gao wrote:
> Document the Milk-V Meles board compatible with the TH1520 fallback.
> 
> Signed-off-by: Han Gao <gaohan@iscas.ac.cn>
> ---
>  Documentation/devicetree/bindings/riscv/thead.yaml | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/riscv/thead.yaml b/Documentation/devicetree/bindings/riscv/thead.yaml
> index 301912dcd290e60f816d380152591106de9415b4..e8170915f4d6d63fbc10a0e6863ea7d5000e3643 100644
> --- a/Documentation/devicetree/bindings/riscv/thead.yaml
> +++ b/Documentation/devicetree/bindings/riscv/thead.yaml
> @@ -17,9 +17,11 @@ properties:
>      const: '/'
>    compatible:
>      oneOf:
> -      - description: BeagleV Ahead single board computer
> +      - description: TH1520 single board computers
>          items:
> -          - const: beagle,beaglev-ahead
> +          - enum:
> +              - beagle,beaglev-ahead
> +              - milkv,meles
>            - const: thead,th1520

Thanks for making the change.

Reviewed-by: Drew Fustini <fustini@kernel.org>

[PATCH v2 2/4] riscv: dts: thead: add Milk-V Meles

[Han Gao]

Add the Milk-V Meles board with UART0, eMMC, SD, Ethernet and the PWM2
fan. Describe the board pin assignments and the PHY on the GMAC0 MDIO
bus. Give GPIO banks aliases and name the exposed 40-pin header lines.

The eMMC I/O supply is fixed at 1.8 V. Enable DDR52 at that voltage and
retain the 52 MHz board limit. Describe 8 GiB as the default memory
size; firmware updates it to match the detected RAM capacity.

Reviewed-by: Drew Fustini <fustini@kernel.org>
Signed-off-by: Han Gao <gaohan@iscas.ac.cn>
---
 arch/riscv/boot/dts/thead/Makefile               |   1 +
 arch/riscv/boot/dts/thead/th1520-milkv-meles.dts | 227 +++++++++++++++++++++++
 2 files changed, 228 insertions(+)

diff --git a/arch/riscv/boot/dts/thead/Makefile b/arch/riscv/boot/dts/thead/Makefile
index b55a17127c2bc06cbfb06d5f7c92dc7296e98437..25f7fe068368c97df2490bedc3eae70276a2e442 100644
--- a/arch/riscv/boot/dts/thead/Makefile
+++ b/arch/riscv/boot/dts/thead/Makefile
@@ -1,2 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0
 dtb-$(CONFIG_ARCH_THEAD) += th1520-lichee-pi-4a.dtb th1520-beaglev-ahead.dtb
+dtb-$(CONFIG_ARCH_THEAD) += th1520-milkv-meles.dtb
diff --git a/arch/riscv/boot/dts/thead/th1520-milkv-meles.dts b/arch/riscv/boot/dts/thead/th1520-milkv-meles.dts
new file mode 100644
index 0000000000000000000000000000000000000000..3714047190789bfccd8ff6810342d7ff865e74e4
--- /dev/null
+++ b/arch/riscv/boot/dts/thead/th1520-milkv-meles.dts
@@ -0,0 +1,227 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/*
+ * Copyright (C) 2021-2022 Alibaba Group Holding Limited.
+ * Copyright (C) 2026 Han Gao <gaohan@iscas.ac.cn>
+ */
+
+/dts-v1/;
+
+#include "th1520.dtsi"
+
+/ {
+	model = "Milk-V Meles";
+	compatible = "milkv,meles", "thead,th1520";
+
+	aliases {
+		ethernet0 = &gmac0;
+		gpio0 = &gpio0;
+		gpio1 = &gpio1;
+		gpio2 = &gpio2;
+		gpio3 = &gpio3;
+		gpio4 = &gpio4;
+		gpio5 = &aogpio;
+		mmc0 = &emmc;
+		mmc1 = &sdio0;
+		serial0 = &uart0;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x0 0x0 0x2 0x0>;
+	};
+
+	fan: pwm-fan {
+		compatible = "pwm-fan";
+		pinctrl-names = "default";
+		pinctrl-0 = <&fan_pins>;
+		pwms = <&pwm 2 10000000 0>;
+		cooling-levels = <0 64 192 255>;
+		#cooling-cells = <2>;
+	};
+};
+
+/* Names follow the 40-pin header signal labels. */
+&aogpio {
+	gpio-line-names = "", "", "", "", "", "", "", "AOGPIO_7",
+			  "AOGPIO_8", "", "AOGPIO_10", "AOGPIO_11";
+};
+
+&emmc {
+	bus-width = <8>;
+	max-frequency = <52000000>;
+	cap-mmc-highspeed;
+	mmc-ddr-1_8v;
+	non-removable;
+	no-sdio;
+	no-sd;
+
+	status = "okay";
+};
+
+&gmac0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&gmac0_pins>, <&mdio0_pins>;
+	phy-handle = <&phy0>;
+	phy-mode = "rgmii-id";
+
+	status = "okay";
+};
+
+&gpio0 {
+	gpio-line-names = "", "", "", "", "", "", "", "", "GPIO0_8",
+			  "GPIO0_9", "GPIO0_10", "GPIO0_11", "", "", "",
+			  "", "GPIO0_16", "GPIO0_17";
+};
+
+&gpio2 {
+	gpio-line-names = "GPIO2_0", "GPIO2_1", "", "", "", "", "", "",
+			  "", "", "", "GPIO2_11", "GPIO2_12", "",
+			  "GPIO2_14", "GPIO2_15", "GPIO2_16", "GPIO2_17",
+			  "", "", "", "", "GPIO2_22", "GPIO2_23",
+			  "GPIO2_24", "GPIO2_25", "", "", "", "", "",
+			  "GPIO2_31";
+};
+
+&gpio3 {
+	gpio-line-names = "GPIO3_0", "GPIO3_1", "GPIO3_2", "GPIO3_3";
+};
+
+&mdio0 {
+	phy0: ethernet-phy@1 {
+		reg = <1>;
+	};
+};
+
+&osc {
+	clock-frequency = <24000000>;
+};
+
+&osc_32k {
+	clock-frequency = <32768>;
+};
+
+&padctrl0_apsys {
+	fan_pins: fan-0 {
+		pwm2-pins {
+			pins = "QSPI0_CSN1";
+			function = "pwm";
+			bias-disable;
+			drive-strength = <25>;
+			input-disable;
+			input-schmitt-disable;
+			slew-rate = <0>;
+		};
+	};
+
+	gmac0_pins: gmac0-0 {
+		tx-pins {
+			pins = "GMAC0_TX_CLK",
+			       "GMAC0_TXEN",
+			       "GMAC0_TXD0",
+			       "GMAC0_TXD1",
+			       "GMAC0_TXD2",
+			       "GMAC0_TXD3";
+			function = "gmac0";
+			bias-disable;
+			drive-strength = <25>;
+			input-disable;
+			input-schmitt-disable;
+			slew-rate = <0>;
+		};
+
+		rx-pins {
+			pins = "GMAC0_RX_CLK",
+			       "GMAC0_RXDV",
+			       "GMAC0_RXD0",
+			       "GMAC0_RXD1",
+			       "GMAC0_RXD2",
+			       "GMAC0_RXD3";
+			function = "gmac0";
+			bias-disable;
+			drive-strength = <1>;
+			input-enable;
+			input-schmitt-disable;
+			slew-rate = <0>;
+		};
+	};
+
+	mdio0_pins: mdio0-0 {
+		mdc-pins {
+			pins = "GMAC0_MDC";
+			function = "gmac0";
+			bias-disable;
+			drive-strength = <13>;
+			input-disable;
+			input-schmitt-disable;
+			slew-rate = <0>;
+		};
+
+		mdio-pins {
+			pins = "GMAC0_MDIO";
+			function = "gmac0";
+			bias-disable;
+			drive-strength = <13>;
+			input-enable;
+			input-schmitt-enable;
+			slew-rate = <0>;
+		};
+	};
+
+	sdio0_pins: sdio0-0 {
+		detn-pins {
+			pins = "SDIO0_DETN";
+			function = "sdio";
+			bias-disable; /* external pull-up */
+			drive-strength = <1>;
+			input-enable;
+			input-schmitt-enable;
+			slew-rate = <0>;
+		};
+	};
+
+	uart0_pins: uart0-0 {
+		tx-pins {
+			pins = "UART0_TXD";
+			function = "uart";
+			bias-disable;
+			drive-strength = <3>;
+			input-disable;
+			input-schmitt-disable;
+			slew-rate = <0>;
+		};
+
+		rx-pins {
+			pins = "UART0_RXD";
+			function = "uart";
+			bias-disable;
+			drive-strength = <1>;
+			input-enable;
+			input-schmitt-enable;
+			slew-rate = <0>;
+		};
+	};
+};
+
+&sdio0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&sdio0_pins>;
+	bus-width = <4>;
+	max-frequency = <50000000>;
+	cap-sd-highspeed;
+	no-1-8-v;
+	disable-wp;
+	no-sdio;
+
+	status = "okay";
+};
+
+&uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_pins>;
+
+	status = "okay";
+};

-- 
2.47.3

[PATCH v2 3/4] riscv: dts: thead: enable AP6256 Wi-Fi on Milk-V Meles

[Han Gao]

Connect AP6256 to SDIO1 with its fixed supplies and PMIC LPO clock.
Use GPIO0_20 for WL_REG_ON and GPIO0_21 for the host-wake interrupt.
Keep GPIO1_24 low to select the external antenna by default.

Use the existing BCM43456 binding and the 198 MHz board limit.
Keep module power during suspend and assign mmc2 to SDIO1.

Reviewed-by: Drew Fustini <fustini@kernel.org>
Signed-off-by: Han Gao <gaohan@iscas.ac.cn>
---
 arch/riscv/boot/dts/thead/th1520-milkv-meles.dts | 94 ++++++++++++++++++++++++
 1 file changed, 94 insertions(+)

diff --git a/arch/riscv/boot/dts/thead/th1520-milkv-meles.dts b/arch/riscv/boot/dts/thead/th1520-milkv-meles.dts
index 3714047190789bfccd8ff6810342d7ff865e74e4..bb1be377569063b0f6d6864c8d18d37103c2c7a6 100644
--- a/arch/riscv/boot/dts/thead/th1520-milkv-meles.dts
+++ b/arch/riscv/boot/dts/thead/th1520-milkv-meles.dts
@@ -7,6 +7,7 @@
 /dts-v1/;
 
 #include "th1520.dtsi"
+#include <dt-bindings/gpio/gpio.h>
 
 / {
 	model = "Milk-V Meles";
@@ -22,6 +23,7 @@ aliases {
 		gpio5 = &aogpio;
 		mmc0 = &emmc;
 		mmc1 = &sdio0;
+		mmc2 = &sdio1;
 		serial0 = &uart0;
 	};
 
@@ -29,6 +31,13 @@ chosen {
 		stdout-path = "serial0:115200n8";
 	};
 
+	wifi_32k: clock-wifi-32k {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <32768>;
+		/* The module LPO input is supplied by PMIC_32K_OUT. */
+	};
+
 	memory@0 {
 		device_type = "memory";
 		reg = <0x0 0x0 0x2 0x0>;
@@ -42,6 +51,30 @@ fan: pwm-fan {
 		cooling-levels = <0 64 192 255>;
 		#cooling-cells = <2>;
 	};
+
+	wifi_vbat: regulator-wifi-vbat {
+		compatible = "regulator-fixed";
+		regulator-name = "WIFI_3V3";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
+	};
+
+	wifi_vddio: regulator-wifi-vddio {
+		compatible = "regulator-fixed";
+		regulator-name = "WIFI_VDDIO";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+		regulator-always-on;
+	};
+
+	wifi_pwrseq: wifi-pwrseq {
+		compatible = "mmc-pwrseq-simple";
+		pinctrl-names = "default";
+		pinctrl-0 = <&wifi_enable_pins>;
+		reset-gpios = <&gpio0 20 GPIO_ACTIVE_LOW>;
+		post-power-on-delay-ms = <50>;
+	};
 };
 
 /* Names follow the 40-pin header signal labels. */
@@ -77,6 +110,16 @@ &gpio0 {
 			  "", "GPIO0_16", "GPIO0_17";
 };
 
+&gpio1 {
+	/* GPIO1_24 low selects the external antenna through U39. */
+	wifi-antenna-select-hog {
+		gpio-hog;
+		gpios = <24 GPIO_ACTIVE_HIGH>;
+		output-low;
+		line-name = "wifi-external-antenna";
+	};
+};
+
 &gpio2 {
 	gpio-line-names = "GPIO2_0", "GPIO2_1", "", "", "", "", "", "",
 			  "", "", "", "GPIO2_11", "GPIO2_12", "",
@@ -206,6 +249,27 @@ rx-pins {
 	};
 };
 
+&padctrl1_apsys {
+	wifi_enable_pins: wifi-enable-0 {
+		gpio-pins {
+			pins = "GPIO0_20";
+			bias-disable;
+			drive-strength = <7>;
+			input-disable;
+		};
+	};
+
+	wifi_host_wake_pins: wifi-host-wake-0 {
+		gpio-pins {
+			pins = "GPIO0_21";
+			function = "gpio";
+			bias-disable;
+			input-enable;
+			input-schmitt-enable;
+		};
+	};
+};
+
 &sdio0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&sdio0_pins>;
@@ -219,6 +283,36 @@ &sdio0 {
 	status = "okay";
 };
 
+&sdio1 {
+	bus-width = <4>;
+	max-frequency = <198000000>;
+	cap-sd-highspeed;
+	cap-sdio-irq;
+	non-removable;
+	no-sd;
+	no-mmc;
+	keep-power-in-suspend;
+	vmmc-supply = <&wifi_vbat>;
+	vqmmc-supply = <&wifi_vddio>;
+	mmc-pwrseq = <&wifi_pwrseq>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	status = "okay";
+
+	wifi@1 {
+		compatible = "brcm,bcm43456-fmac", "brcm,bcm4329-fmac";
+		reg = <1>;
+		clocks = <&wifi_32k>;
+		clock-names = "lpo";
+		pinctrl-names = "default";
+		pinctrl-0 = <&wifi_host_wake_pins>;
+		interrupt-parent = <&gpio0>;
+		interrupts = <21 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-names = "host-wake";
+	};
+};
+
 &uart0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart0_pins>;

-- 
2.47.3

[PATCH v2 4/4] riscv: dts: thead: enable HDMI on Milk-V Meles

[Han Gao]

Enable the DC8200 display controller and DW-HDMI transmitter. Connect
the transmitter to the board Type-A HDMI connector with reciprocal graph
endpoints.

Reviewed-by: Drew Fustini <fustini@kernel.org>
Signed-off-by: Han Gao <gaohan@iscas.ac.cn>
---
 arch/riscv/boot/dts/thead/th1520-milkv-meles.dts | 25 ++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/arch/riscv/boot/dts/thead/th1520-milkv-meles.dts b/arch/riscv/boot/dts/thead/th1520-milkv-meles.dts
index bb1be377569063b0f6d6864c8d18d37103c2c7a6..1c9de6b37a3e6f7a4ec34fdfa584332c7ab3fc59 100644
--- a/arch/riscv/boot/dts/thead/th1520-milkv-meles.dts
+++ b/arch/riscv/boot/dts/thead/th1520-milkv-meles.dts
@@ -38,6 +38,17 @@ wifi_32k: clock-wifi-32k {
 		/* The module LPO input is supplied by PMIC_32K_OUT. */
 	};
 
+	hdmi-connector {
+		compatible = "hdmi-connector";
+		type = "a";
+
+		port {
+			hdmi_con_in: endpoint {
+				remote-endpoint = <&hdmi_out_con>;
+			};
+		};
+	};
+
 	memory@0 {
 		device_type = "memory";
 		reg = <0x0 0x0 0x2 0x0>;
@@ -83,6 +94,10 @@ &aogpio {
 			  "AOGPIO_8", "", "AOGPIO_10", "AOGPIO_11";
 };
 
+&dpu {
+	status = "okay";
+};
+
 &emmc {
 	bus-width = <8>;
 	max-frequency = <52000000>;
@@ -133,6 +148,16 @@ &gpio3 {
 	gpio-line-names = "GPIO3_0", "GPIO3_1", "GPIO3_2", "GPIO3_3";
 };
 
+&hdmi {
+	status = "okay";
+};
+
+&hdmi_out_port {
+	hdmi_out_con: endpoint {
+		remote-endpoint = <&hdmi_con_in>;
+	};
+};
+
 &mdio0 {
 	phy0: ethernet-phy@1 {
 		reg = <1>;

-- 
2.47.3