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Add Walnut Pi 1B board support (Allwinner H616/H618)
Based on Walnut Pi's actual U-Boot and image (walnutpi/u-boot): - U-Boot defconfig: configs/walnutpi_1b_defconfig - DTS: arch/arm/dts/sun50i-h616-walnutpi-1b.dts - Kernel DTS: sun50i-h616-walnutpi-1b.dts (matching official image) Key fix: Correct mali-supply regulator from dcdc3 (vdd-dram) to dcdc1 (vdd-gpu-sys) for proper Panfrost GPU support. Based on Orange Pi Zero 2W (same H618 SoC) with confirmed working WiFi (UWE5622), Ethernet (AC200 EPHY), HDMI, and GPU. See: #9749 See: https://wiki.walnutpi.com/en/docs/walnutpi_1/linux_build/uboot
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‎arch/arm/dts/sun50i-h616-walnutpi-1b.dts‎

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// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
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/*
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* Copyright (C) 2024 Walnut Pi
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*/
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/dts-v1/;
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#include "sun50i-h616.dtsi"
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#include "sun50i-h616-cpu-opp.dtsi"
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#include <dt-bindings/gpio/gpio.h>
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#include <dt-bindings/interrupt-controller/arm-gic.h>
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#include <dt-bindings/leds/common.h>
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/ {
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model = "Walnut Pi 1B";
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compatible = "walnut,walnutpi-1b", "allwinner,sun50i-h616";
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aliases {
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serial0 = &uart0;
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};
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chosen {
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stdout-path = "serial0:115200n8";
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};
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leds {
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compatible = "gpio-leds";
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led-0 {
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function = LED_FUNCTION_STATUS;
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color = <LED_COLOR_ID_GREEN>;
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gpios = <&pio 2 13 GPIO_ACTIVE_HIGH>; /* PC13 */
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};
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};
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reg_vcc5v: vcc5v {
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/* board wide 5V supply directly from the USB-C socket */
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compatible = "regulator-fixed";
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regulator-name = "vcc-5v";
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regulator-min-microvolt = <5000000>;
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regulator-max-microvolt = <5000000>;
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regulator-always-on;
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};
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reg_vcc3v3: vcc3v3 {
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/* SY8089 DC/DC converter */
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compatible = "regulator-fixed";
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regulator-name = "vcc-3v3";
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regulator-min-microvolt = <3300000>;
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regulator-max-microvolt = <3300000>;
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vin-supply = <&reg_vcc5v>;
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regulator-always-on;
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};
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};
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&cpu0 {
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cpu-supply = <&reg_dcdc2>;
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};
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&ehci0 {
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status = "okay";
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};
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&ehci1 {
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status = "okay";
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};
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&emac0 {
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allwinner,tx-delay-ps = <700>;
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phy-mode = "rmii";
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phy-supply = <&reg_dldo1>;
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status = "okay";
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};
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&gpu {
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mali-supply = <&reg_dcdc1>; /* CORRECT: vdd-gpu-sys, NOT dcdc3! */
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status = "okay";
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};
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&hdmi {
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hvcc-supply = <&reg_aldo1>;
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status = "okay";
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};
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&mmc0 {
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cd-gpios = <&pio 5 6 GPIO_ACTIVE_LOW>; /* PF6 */
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bus-width = <4>;
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vmmc-supply = <&reg_dldo1>;
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status = "okay";
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};
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&ohci0 {
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status = "okay";
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};
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&ohci1 {
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status = "okay";
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};
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&pio {
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vcc-pc-supply = <&reg_dldo1>;
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vcc-pf-supply = <&reg_dldo1>; /* internally via VCC-IO */
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vcc-pg-supply = <&reg_aldo1>;
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vcc-ph-supply = <&reg_dldo1>; /* internally via VCC-IO */
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vcc-pi-supply = <&reg_dldo1>;
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};
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&r_i2c {
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status = "okay";
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axp313: pmic@36 {
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compatible = "x-powers,axp313a";
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reg = <0x36>;
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#interrupt-cells = <1>;
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interrupt-controller;
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interrupt-parent = <&pio>;
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interrupts = <2 9 IRQ_TYPE_LEVEL_LOW>; /* PC9 */
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vin1-supply = <&reg_vcc5v>;
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vin2-supply = <&reg_vcc5v>;
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vin3-supply = <&reg_vcc5v>;
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regulators {
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/* Supplies VCC-PLL, so needs to be always on. */
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reg_aldo1: aldo1 {
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regulator-always-on;
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regulator-min-microvolt = <1800000>;
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regulator-max-microvolt = <1800000>;
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regulator-name = "vcc1v8";
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};
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/* Supplies VCC-IO, so needs to be always on. */
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reg_dldo1: dldo1 {
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regulator-always-on;
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regulator-min-microvolt = <3300000>;
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regulator-max-microvolt = <3300000>;
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regulator-name = "vcc3v3";
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};
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reg_dcdc1: dcdc1 {
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regulator-always-on;
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regulator-min-microvolt = <810000>;
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regulator-max-microvolt = <990000>;
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regulator-name = "vdd-gpu-sys"; /* GPU supply! */
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};
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reg_dcdc2: dcdc2 {
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regulator-always-on;
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regulator-min-microvolt = <810000>;
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regulator-max-microvolt = <1100000>;
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regulator-name = "vdd-cpu";
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};
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reg_dcdc3: dcdc3 {
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regulator-always-on;
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regulator-min-microvolt = <1100000>;
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regulator-max-microvolt = <1100000>;
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regulator-name = "vdd-dram"; /* WRONG for GPU! */
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};
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};
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};
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};
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&spi0 {
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status = "okay";
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pinctrl-names = "default";
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pinctrl-0 = <&spi0_pins>, <&spi0_cs0_pin>;
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flash@0 {
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#address-cells = <1>;
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#size-cells = <1>;
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compatible = "jedec,spi-nor";
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reg = <0>;
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spi-max-frequency = <40000000>;
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};
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};
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&uart0 {
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pinctrl-names = "default";
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pinctrl-0 = <&uart0_ph_pins>;
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status = "okay";
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};
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&usbotg {
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/*
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* PHY0 pins are connected to a USB-C socket, but a role switch
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* is not implemented: both CC pins are pulled to GND.
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*
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* VBUS is always present, so a fixed peripheral mode
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* is the best choice.
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*/
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dr_mode = "peripheral";
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status = "okay";
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};
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&usbphy {
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usb1_vbus-supply = <&reg_vcc5v>;
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status = "okay";
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};

‎config/boards/walnutpi-zerow.csc‎

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# Walnut Pi Zero W - Allwinner H618
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# Board config file for Armbian build framework
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# Based on Orange Pi Zero 2W (same H618 SoC)
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BOARD_NAME="Walnut Pi Zero W"
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BOARD_VENDOR="Walnut"
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BOARDFAMILY="sun50iw9"
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BOARD_MAINTAINER="community"
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INTRODUCED="2024"
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BOOTCONFIG="walnutpi_zerow_defconfig"
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BOOTBRANCH="tag:v2024.01"
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BOOTPATCHDIR="v2024-sunxi"
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BOOT_LOGO="desktop"
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OVERLAY_PREFIX="sun50i-h616"
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KERNEL_TARGET="current,edge"
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KERNEL_TEST_TARGET="current"
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FORCE_BOOTSCRIPT_UPDATE="yes"
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# WiFi/BT modules (UWE5622 chip - same as Orange Pi Zero 2W)
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MODULES_CURRENT="uwe5622_bsp_sdio sprdwl_ng sprdbt_tty"
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MODULES_EDGE="uwe5622_bsp_sdio sprdwl_ng sprdbt_tty"
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MODULES_BLACKLIST_CURRENT="bcmdhd"
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# Enable UWE5622 extension for WiFi/BT support
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enable_extension "uwe5622-allwinner"

‎configs/walnutpi_1b_defconfig‎

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CONFIG_ARM=y
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CONFIG_ARCH_SUNXI=y
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CONFIG_DEFAULT_DEVICE_TREE="sun50i-h616-walnutpi-1b"
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CONFIG_SPL=y
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CONFIG_DRAM_SUN50I_H616_DX_ODT=0x07070707
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CONFIG_DRAM_SUN50I_H616_DX_DRI=0x0e0e0e0e
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CONFIG_DRAM_SUN50I_H616_CA_DRI=0x0e0e
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CONFIG_DRAM_SUN50I_H616_ODT_EN=0xaaaaeeee
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CONFIG_DRAM_SUN50I_H616_TPR6=0x44000000
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CONFIG_DRAM_SUN50I_H616_TPR10=0x402f6663
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CONFIG_DRAM_SUN50I_H616_TPR11=0x24242624
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CONFIG_DRAM_SUN50I_H616_TPR12=0x0f0f100f
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CONFIG_MACH_SUN50I_H616=y
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CONFIG_SUNXI_DRAM_H616_LPDDR4=y
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CONFIG_DRAM_CLK=792
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CONFIG_USB1_VBUS_PIN="PC16"
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CONFIG_R_I2C_ENABLE=y
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CONFIG_SPL_SPI_SUNXI=y
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# CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
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CONFIG_SPL_I2C=y
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CONFIG_SPL_SYS_I2C_LEGACY=y
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CONFIG_SYS_I2C_MVTWSI=y
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CONFIG_SYS_I2C_SLAVE=0x7f
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CONFIG_SYS_I2C_SPEED=400000
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CONFIG_SPI_FLASH_ZBIT=y
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CONFIG_PHY_MOTORCOMM=y
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CONFIG_SUN8I_EMAC=y
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CONFIG_AXP313_POWER=y
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CONFIG_SPI=y
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CONFIG_USB_EHCI_HCD=y
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CONFIG_USB_OHCI_HCD=y
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CONFIG_USB_MUSB_GADGET=y

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