Subject: Re: [PATCH v2 3/3] arm64: dts: allwinner: A133: add support for Baijie Helper A133 board

From: Paul Kocialkowski <[email-masked]>
Date: Mon, 18 May 2026 13:52:59 +0200

Hi Alexander,

Le Sun 10 May 26, 22:16, Alexander Sverdlin a écrit :
> Baijie Helper A133 board is a development board around Baijie A133 Core
> SBC. Features:

Just in case you missed it, there was a previous submission for this
board which wasn't followed up on.

I also have one of this board and wanted to respin support, but it looks
like you beat me to it :)

Thanks for working on this!

Please change the naming to "Baijie HelperBoard A133" and "Baijie A133
HelperBoard Core" to align with the vendor terminology and rename the
files as:
- sun50i-a133-helperboard.dts
- sun50i-a133-helperboard-core.dtsi

> - 1/2/4GiB LPDDR4 DRAM
> - 8/16/32GiB eMMC
> - AXP707 PMIC
> - 2 USB 2.0 ports
> - MicroSD slot and on-board eMMC module
> - Gigabit Ethernet
> - Bluetooth
> - WiFi
> 
> Add initial support for both the Helper and Core boards, including UART,
> PMU, eMMC, USB, Ethernet.
> 
> Signed-off-by: Alexander Sverdlin <[email-masked]>
> ---
> 
> Changelog:
> v2:
> - introduced baijie,helper-a133-core compatible for the Core (SoM) board
> 
>  arch/arm64/boot/dts/allwinner/Makefile        |   1 +
>  .../dts/allwinner/sun50i-a133-baije-core.dtsi | 162 ++++++++++++++++++
>  .../allwinner/sun50i-a133-baijie-helper.dts   |  94 ++++++++++
>  3 files changed, 257 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/allwinner/sun50i-a133-baije-core.dtsi
>  create mode 100644 arch/arm64/boot/dts/allwinner/sun50i-a133-baijie-helper.dts
> 
> diff --git a/arch/arm64/boot/dts/allwinner/Makefile b/arch/arm64/boot/dts/allwinner/Makefile
> index d116864b6c2b..926dfa851100 100644
> --- a/arch/arm64/boot/dts/allwinner/Makefile
> +++ b/arch/arm64/boot/dts/allwinner/Makefile
> @@ -18,6 +18,7 @@ dtb-$(CONFIG_ARCH_SUNXI) += sun50i-a64-sopine-baseboard.dtb
>  dtb-$(CONFIG_ARCH_SUNXI) += sun50i-a64-teres-i.dtb
>  dtb-$(CONFIG_ARCH_SUNXI) += sun50i-h64-remix-mini-pc.dtb
>  dtb-$(CONFIG_ARCH_SUNXI) += sun50i-a100-allwinner-perf1.dtb
> +dtb-$(CONFIG_ARCH_SUNXI) += sun50i-a133-baijie-helper.dtb
>  dtb-$(CONFIG_ARCH_SUNXI) += sun50i-a133-liontron-h-a133l.dtb
>  dtb-$(CONFIG_ARCH_SUNXI) += sun50i-h5-bananapi-m2-plus.dtb
>  dtb-$(CONFIG_ARCH_SUNXI) += sun50i-h5-bananapi-m2-plus-v1.2.dtb
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a133-baije-core.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a133-baije-core.dtsi
> new file mode 100644
> index 000000000000..65b094f30bf5
> --- /dev/null
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a133-baije-core.dtsi
> @@ -0,0 +1,162 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Copyright (c) 2025 Arm Ltd.
> + */
> +
> +/dts-v1/;
> +
> +#include "sun50i-a100.dtsi"
> +#include "sun50i-a100-cpu-opp.dtsi"
> +
> +/{

You could add a model here while at it, even though it would generally
be overwritten.

> +	compatible = "baijie,helper-a133-core",
> +		     "allwinner,sun50i-a100";
> +
> +	aliases {
> +		serial1 = &uart1;	/* BT module */

Not sure this is reallyt useful.

> +	};

You should add:

	chosen {
		stdout-path = "serial0:115200n8";
	};

As well as the incoming 5v regulator:

	reg_vcc5v: vcc5v {
		compatible = "regulator-fixed";
		regulator-name = "vcc-5v";
		regulator-min-microvolt = <5000000>;
		regulator-max-microvolt = <5000000>;
		regulator-always-on;
	};

> +};
> +
> +&cpu0 {
> +	cpu-supply = <&reg_dcdc2>;
> +};
> +
> +&pio {
> +	vcc-pb-supply = <&reg_dcdc1>;
> +	vcc-pc-supply = <&reg_eldo1>;
> +	vcc-pd-supply = <&reg_dcdc1>;
> +	vcc-pe-supply = <&reg_dldo2>;
> +	vcc-pf-supply = <&reg_dcdc1>;
> +	vcc-pg-supply = <&reg_dldo1>;
> +	vcc-ph-supply = <&reg_dcdc1>;
> +};
> +
> +&mmc2 {

mmc2 goes before pio (alphanum sorting).

> +	vmmc-supply = <&reg_dcdc1>;
> +	vqmmc-supply = <&reg_eldo1>;
> +	cap-mmc-hw-reset;
> +	non-removable;
> +	bus-width = <8>;
> +	mmc-ddr-1_8v;
> +	mmc-hs200-1_8v;
> +	status = "okay";

You can add:
	max-frequency = <100000000>;
	cap-mmc-highspeed;

> +};
> +
> +&r_i2c0 {
> +	status = "okay";
> +
> +	axp803: pmic@34 {
> +		compatible = "x-powers,axp803";
> +		reg = <0x34>;
> +		interrupt-parent = <&r_intc>;
> +		interrupts = <0 IRQ_TYPE_LEVEL_LOW>;

You can also add:
		x-powers,drive-vbus-en; /* set N_VBUSEN as output pin */

		aldoin-supply = <&reg_vcc5v>;
		dldoin-supply = <&reg_vcc5v>;
		eldoin-supply = <&reg_vcc5v>;
		fldoin-supply = <&reg_dcdc5>;
		vin1-supply = <&reg_vcc5v>;
		vin2-supply = <&reg_vcc5v>;
		vin3-supply = <&reg_vcc5v>;
		vin4-supply = <&reg_vcc5v>;
		vin5-supply = <&reg_vcc5v>;
		vin6-supply = <&reg_vcc5v>;

> +	};
> +};
> +
> +#include "axp803.dtsi"
> +
> +&ac_power_supply {
> +	status = "okay";
> +};
> +
> +&reg_aldo1 {
> +	regulator-always-on;
> +	regulator-min-microvolt = <700000>;
> +	regulator-max-microvolt = <3300000>;

Should be:
	regulator-min-microvolt = <1800000>;
	regulator-max-microvolt = <1800000>;
	regulator-name = "vcc-pll-avcc";

> +};
> +
> +&reg_aldo2 {
> +	regulator-always-on;
> +	regulator-min-microvolt = <700000>;
> +	regulator-max-microvolt = <3300000>;

Should be:
	regulator-min-microvolt = <1800000>;
	regulator-max-microvolt = <1800000>;
	regulator-name = "vcc-dram-lpddr";

> +};
> +
> +&reg_aldo3 {
> +	regulator-always-on;
> +	regulator-min-microvolt = <700000>;
> +	regulator-max-microvolt = <3300000>;
> +	regulator-enable-ramp-delay = <1000>;

Should be:
	regulator-min-microvolt = <1800000>;
	regulator-max-microvolt = <1800000>;
	regulator-name = "vcc-pl";

> +};
> +
> +&reg_dcdc1 {
> +	regulator-always-on;
> +	regulator-min-microvolt = <1600000>;
> +	regulator-max-microvolt = <3400000>;
> +	regulator-name = "vcc-3v3";

Should be:
	regulator-min-microvolt = <3300000>;
	regulator-max-microvolt = <3300000>;
	regulator-name = "vcc-io-usb-pd-nand-3v3";

> +};
> +
> +&reg_dcdc2 {
> +	regulator-always-on;
> +	regulator-min-microvolt = <500000>;
> +	regulator-max-microvolt = <1300000>;

Should be:
	regulator-min-microvolt = <900000>;
	regulator-max-microvolt = <1300000>;

> +	regulator-name = "vdd-cpu";
> +};
> +
> +&reg_dcdc3 {
> +	regulator-always-on;
> +	regulator-min-microvolt = <500000>;
> +	regulator-max-microvolt = <1300000>;
> +};

DCDC3 is polyphased with DCDC2, so remove this one and add:
/* DCDC3 is polyphased with DCDC2 */

> +
> +&reg_dcdc4 {
> +	regulator-always-on;
> +	regulator-min-microvolt = <500000>;
> +	regulator-max-microvolt = <1300000>;
> +	regulator-name = "vdd-sys";

Should be:
	regulator-min-microvolt = <810000>;
	regulator-max-microvolt = <990000>;
	regulator-name = "vcc-usb-sys";

> +};
> +
> +&reg_dcdc5 {
> +	regulator-always-on;
> +	regulator-min-microvolt = <800000>;
> +	regulator-max-microvolt = <1840000>;
> +	regulator-name = "vcc-dram";

Should be:
	regulator-min-microvolt = <1100000>;
	regulator-max-microvolt = <1100000>;
	regulator-name = "vcc-dram-2";

ALDO2 is the main DRAM supply, this is the second one.

> +};
> +
> +/* DCDC6 unused */
> +
> +&reg_dldo1 {
> +	regulator-min-microvolt = <700000>;
> +	regulator-max-microvolt = <3300000>;
> +	regulator-enable-ramp-delay = <1000>;

Should be:
	regulator-min-microvolt = <1800000>;
	regulator-max-microvolt = <1800000>;
	regulator-name = "vcc-pg";

> +};
> +
> +&reg_dldo2 {
> +	regulator-min-microvolt = <700000>;
> +	regulator-max-microvolt = <3400000>;
> +	regulator-enable-ramp-delay = <1000>;

Should be:
	regulator-min-microvolt = <1800000>;
	regulator-max-microvolt = <1800000>;
	regulator-name = "vcc-csi-pe";

> +};
> +
> +&reg_dldo3 {
> +	regulator-min-microvolt = <700000>;
> +	regulator-max-microvolt = <3300000>;
> +	regulator-enable-ramp-delay = <1000>;
> +	regulator-name = "avdd-csi";

Should be:
	regulator-min-microvolt = <2800000>;
	regulator-max-microvolt = <2800000>;
	regulator-name = "ldo-avdd-csi";

> +};
> +
> +&reg_dldo4 {
> +	regulator-min-microvolt = <700000>;
> +	regulator-max-microvolt = <3300000>;
> +	regulator-enable-ramp-delay = <1000>;

Should be:
	regulator-min-microvolt = <2800000>;
	regulator-max-microvolt = <2800000>;
	regulator-name = "ldo-avdd-csi";

> +};

You can add:

&reg_drivevbus {
	regulator-name = "usb0-vbus";
	status = "okay";
};

> +
> +&reg_eldo1 {
> +	regulator-min-microvolt = <700000>;
> +	regulator-max-microvolt = <1900000>;
> +	regulator-enable-ramp-delay = <1000>;

Should be:
	regulator-min-microvolt = <1800000>;
	regulator-max-microvolt = <1800000>;
	regulator-name = "vcc-pc-efuse-lvds-cpvin-mcsi";

> +};
> +
> +&reg_eldo2 {
> +	regulator-min-microvolt = <700000>;
> +	regulator-max-microvolt = <1900000>;

Should be:
	regulator-min-microvolt = <1200000>;
	regulator-max-microvolt = <1200000>;

> +	regulator-enable-ramp-delay = <1000>;
> +	regulator-name = "dvdd-csi";
> +};
> +
> +/* ELDO3 unused */
> +
> +&reg_fldo1 {
> +	regulator-always-on;
> +	regulator-min-microvolt = <700000>;
> +	regulator-max-microvolt = <1450000>;
> +	regulator-name = "vdd-cpus-usb";
> +};
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a133-baijie-helper.dts b/arch/arm64/boot/dts/allwinner/sun50i-a133-baijie-helper.dts
> new file mode 100644
> index 000000000000..ccbca5d0a40c
> --- /dev/null
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a133-baijie-helper.dts
> @@ -0,0 +1,94 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Copyright (c) 2025 Arm Ltd.
> + */
> +
> +/dts-v1/;
> +
> +#include "sun50i-a133-baije-core.dtsi"
> +
> +#include <dt-bindings/gpio/gpio.h>
> +#include <dt-bindings/leds/common.h>
> +
> +/{
> +	model = "HelperBoard A133";
> +	compatible = "baijie,helper-a133",
> +		     "baijie,helper-a133-core",
> +		     "allwinner,sun50i-a100";
> +
> +	aliases {
> +		serial0 = &uart0;

The is best added to the core dtsi.

> +	};
> +
> +	chosen {
> +		stdout-path = "serial0:115200n8";

Ditto.

> +	};
> +
> +	leds {
> +		compatible = "gpio-leds";
> +
> +		led {
> +			function = LED_FUNCTION_INDICATOR;
> +			color = <LED_COLOR_ID_GREEN>;
> +			gpios = <&pio 7 13 GPIO_ACTIVE_LOW>;	/* PH13 */
> +		};
> +	};
> +};
> +
> +&mmc0 {
> +	vmmc-supply = <&reg_dcdc1>;
> +	cd-gpios = <&pio 5 6 GPIO_ACTIVE_LOW>;	/* PF6 */
> +	bus-width = <4>;
> +	status = "okay";

You can add:
	disable-wp;

> +};
> +
> +&uart0 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&uart0_pb_pins>;
> +	status = "okay";
> +};
> +
> +&rgmii0_pins {
> +	drive-strength = <30>;
> +};

Sorting is also incorrect throughout the file, please use alphanum
sorting for phandle-based overwrites.

> +
> +&emac0 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&rgmii0_pins>;
> +	phy-handle = <&eth_phy>;
> +	phy-mode = "rgmii-id";
> +	allwinner,rx-delay-ps = <200>;
> +	allwinner,tx-delay-ps = <200>;
> +	status = "okay";
> +};
> +
> +&mdio0 {
> +	reset-gpios = <&pio 7 11 GPIO_ACTIVE_LOW>;	/* PH11 */
> +	reset-delay-us = <10000>;
> +	reset-post-delay-us = <150000>;
> +
> +	eth_phy: ethernet-phy@1 {
> +		compatible = "ethernet-phy-ieee802.3-c22";
> +		reg = <1>;
> +	};
> +};
> +
> +&usbphy {
> +	status = "okay";

You can add:
	usb0_vbus-supply = <&reg_dcdc1>;
	usb1_vbus-supply = <&reg_dcdc4>;

> +};
> +
> +&ehci0 {
> +	status = "okay";
> +};

AFAIK there is no ID pin so ehci0/ohci0 will not be used.
It seems that version 1.7 of the board used PH0 as USB0 ID pin but
version 2.5 has reassigned PH8 to LCD reset.

> +&ohci0 {
> +	status = "okay";
> +};
> +
> +&ehci1 {
> +	status = "okay";
> +};
> +
> +&ohci1 {
> +	status = "okay";
> +};
> -- 
> 2.54.0

-- 
Paul Kocialkowski,

Independent contractor - sys-base - https://www.sys-base.io/
Free software developer - https://www.paulk.fr/

Expert in multimedia, graphics and embedded hardware support with Linux.