[PATCH v4 0/7] Add support for Baijie Helper A133 board

[PATCH v4 0/7] Add support for Baijie Helper A133 board

[Alexander Sverdlin]

Baijie Helper A133 board is a development board around Baijie A133 Core
SBC. Features:

- 1/2/4GiB LPDDR4 DRAM
- 8/16/32GiB eMMC
- AXP707 PMIC
- USB-C OTG port in peripheral mode (via onboard hub)
- 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, LRADC-connected buttons.

UART1 can only be used for Bluetooth module, but BT-WiFi combo Allwinner
AW869A chip has not mainline driver currently.

Link: https://szbaijie.com/index/product/product_detail.html?product_id=23&language=en

Changelog:
v4:
- reserve RAM for ATF
- sun4i-lradc-keys: Add A100/A133 compatible
- dt-bindings: renamed "Baijie Helper A133" -> "Baijie A133 HelperBoard"
- dt-bindings: renamed "baijie,helper-a133" -> "baijie,helperboard-a133"
- dt-bindings: introduced allwinner,sun50i-a100-lradc
- reserve RAM for ATF
- renamed "sun50i-a133-baijie-helper.dtb" -> "sun50i-a133-helperboard.dtb"
- added "model" property into root of sun50i-a133-helperboard-core.dtsi
- added "cap-mmc-highspeed" and "max-frequency" into &mmc2
- added "x-powers,drive-vbus-en" and "*-supply" into &axp803
- dropped all "regulator-enable-ramp-delay" properties
- replaced &reg_dcdc3 with a "polyphased" comment
- exact DRAM voltage in &reg_dcdc5
- disabled &reg_dcdc6 to avoid "[   31.710641] dcdc6: disabling"
- added &reg_vdd5v "root" regulator
- added "disable-wp" into &mmc0
- commented &usb_otg
- assigned usb1_vbus-supply in &usbphy
v3:
- added lradc node to sun50i-a100.dtsi
- enabled LRADC driver in arm64 defconfig
- added my copyrights into the newly introduced DTs
- all DT nodes sorted alphabetically
- all always-on regulators commented/propetly named
- all regulators got proper voltages (not default ranges)
- ADC-sensed buttons K1..K5 added
- re-labelled "eth_phy" -> "rgmii_phy"
- usbphy 0 switched from host into peripheral mode (downstream from an
  onboard hub)
- typo sun50i-a133-baije-core.dtsi -> sun50i-a133-baijie-core.dtsi
- https://lore.kernel.org/all/20260517234134.2737320-1-alexander.sverdlin@gmail.com/
v2:
- introduced baijie,helper-a133-core compatible for the Core (SoM) board
- https://lore.kernel.org/all/20260510201644.4143710-1-alexander.sverdlin@gmail.com/
v1:
- https://lore.kernel.org/all/20260503191842.2736130-1-alexander.sverdlin@gmail.com/

Alexander Sverdlin (7):
  arm64: defconfig: Enable Allwinner LRADC input driver
  dt-bindings: vendor-prefixes: Add Shenzhen Baijie Technology Co., Ltd.
  dt-bindings: arm: sunxi: Add Baijie HelperBoard A133 compatible
  dt-bindings: input: sun4i-lradc-keys: Add A100/A133 compatible
  arm64: dts: allwinner: a100: Add LRADC node
  arm64: dts: allwinner: a100: reserve RAM for ATF
  arm64: dts: allwinner: A133: add support for Baijie Helper A133 board

 .../devicetree/bindings/arm/sunxi.yaml        |   6 +
 .../input/allwinner,sun4i-a10-lradc-keys.yaml |   1 +
 .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
 arch/arm64/boot/dts/allwinner/Makefile        |   1 +
 .../arm64/boot/dts/allwinner/sun50i-a100.dtsi |  25 +++
 .../sun50i-a133-helperboard-core.dtsi         | 197 ++++++++++++++++++
 .../dts/allwinner/sun50i-a133-helperboard.dts | 148 +++++++++++++
 arch/arm64/configs/defconfig                  |   1 +
 8 files changed, 381 insertions(+)
 create mode 100644 arch/arm64/boot/dts/allwinner/sun50i-a133-helperboard-core.dtsi
 create mode 100644 arch/arm64/boot/dts/allwinner/sun50i-a133-helperboard.dts

-- 
2.54.0

[PATCH v4 1/7] arm64: defconfig: Enable Allwinner LRADC input driver

[Alexander Sverdlin]

Enable Allwinner LRADC input driver as module to support buttons on Baijie
HelperBoard A133.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
---
Changelog:
v4:
- no changes
v3:
- new patch

 arch/arm64/configs/defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 96ce783f24e7..faf6d86d0555 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -479,6 +479,7 @@ CONFIG_KEYBOARD_GPIO=y
 CONFIG_KEYBOARD_GPIO_POLLED=m
 CONFIG_KEYBOARD_SNVS_PWRKEY=m
 CONFIG_KEYBOARD_IMX_SC_KEY=m
+CONFIG_KEYBOARD_SUN4I_LRADC=m
 CONFIG_KEYBOARD_CROS_EC=y
 CONFIG_KEYBOARD_MTK_PMIC=m
 CONFIG_MOUSE_ELAN_I2C=m
-- 
2.54.0

[PATCH v4 2/7] dt-bindings: vendor-prefixes: Add Shenzhen Baijie Technology Co., Ltd.

[Alexander Sverdlin]

Shenzhen Baijie Technology Co., Ltd. focuses on R&D and production of
embedded products as well as customization of embedded solutions.

Link: https://szbaijie.com/
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Paul Kocialkowski <paulk@sys-base.io>
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
---
 Documentation/devicetree/bindings/vendor-prefixes.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
index 28784d66ae7b..095cf654787f 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
+++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
@@ -229,6 +229,8 @@ patternProperties:
     description: Azoteq (Pty) Ltd
   "^azw,.*":
     description: Shenzhen AZW Technology Co., Ltd.
+  "^baijie,.*":
+    description: Shenzhen Baijie Technology Co., Ltd.
   "^baikal,.*":
     description: BAIKAL ELECTRONICS, JSC
   "^bananapi,.*":
-- 
2.54.0

[PATCH v4 3/7] dt-bindings: arm: sunxi: Add Baijie HelperBoard A133 compatible

[Alexander Sverdlin]

Baijie HelperBoard A133 is a development board around their A133 Core
board. Introduce a compatible for both the Core and the development
boards.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
---
Changelog:
v4:
- renamed "Baijie Helper A133" -> "Baijie A133 HelperBoard"
- renamed "baijie,helper-a133" -> "baijie,helperboard-a133"
v3:
- no separate section for "core" .dtsi
v2:
- introduced baijie,helper-a133-core compatible for the Core (SoM) board
 Documentation/devicetree/bindings/arm/sunxi.yaml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/sunxi.yaml b/Documentation/devicetree/bindings/arm/sunxi.yaml
index e6443c266fa1..82dd58b95f8a 100644
--- a/Documentation/devicetree/bindings/arm/sunxi.yaml
+++ b/Documentation/devicetree/bindings/arm/sunxi.yaml
@@ -96,6 +96,12 @@ properties:
           - const: allwinner,ba10-tvbox
           - const: allwinner,sun4i-a10
 
+      - description: Baijie A133 HelperBoard
+        items:
+          - const: baijie,helperboard-a133
+          - const: baijie,helperboard-a133-core
+          - const: allwinner,sun50i-a100
+
       - description: BananaPi
         items:
           - const: lemaker,bananapi
-- 
2.54.0

[PATCH v4 4/7] dt-bindings: input: sun4i-lradc-keys: Add A100/A133 compatible

[Alexander Sverdlin]

The Allwinner A100/A133 SoCs have an LRADC which is compatible with the
versions in existing SoCs. Add a compatible string for A100, with the R329
fallback.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
---
Changelog:
v4:
- new patch

 .../bindings/input/allwinner,sun4i-a10-lradc-keys.yaml           | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/input/allwinner,sun4i-a10-lradc-keys.yaml b/Documentation/devicetree/bindings/input/allwinner,sun4i-a10-lradc-keys.yaml
index 6bdb8040be65..524c8b51f53f 100644
--- a/Documentation/devicetree/bindings/input/allwinner,sun4i-a10-lradc-keys.yaml
+++ b/Documentation/devicetree/bindings/input/allwinner,sun4i-a10-lradc-keys.yaml
@@ -23,6 +23,7 @@ properties:
       - const: allwinner,sun50i-r329-lradc
       - items:
           - enum:
+              - allwinner,sun50i-a100-lradc
               - allwinner,sun50i-h616-lradc
               - allwinner,sun20i-d1-lradc
           - const: allwinner,sun50i-r329-lradc
-- 
2.54.0

[PATCH v4 5/7] arm64: dts: allwinner: a100: Add LRADC node

[Alexander Sverdlin]

A100/A133 SoCs feature a Low Rate ADC (LRADC) for Key application.

Specs:
- Power supply voltage: 1.8 V
- Reference voltage: 1.35 V
- Interrupt support
- Support Hold Key and General Key
- Support normal, continue and single work mode
- 6-bits resolution, sample rate up to 2 kHz
- Voltage input range between 0 and 1.35 V

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
---
Changelog:
v4:
- added allwinner,sun50i-a100-lradc compatible
v3:
- new patch

 arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
index b3fb1e0ee796..7cb06b19b5a5 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
@@ -466,6 +466,15 @@ ths: thermal-sensor@5070400 {
 			#thermal-sensor-cells = <1>;
 		};
 
+		lradc: lradc@5070800 {
+			compatible = "allwinner,sun50i-a100-lradc", "allwinner,sun50i-r329-lradc";
+			reg = <0x05070800 0x400>;
+			interrupts = <GIC_SPI 22 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&ccu CLK_BUS_LRADC>;
+			resets = <&ccu RST_BUS_LRADC>;
+			status = "disabled";
+		};
+
 		usb_otg: usb@5100000 {
 			compatible = "allwinner,sun50i-a100-musb",
 				     "allwinner,sun8i-a33-musb";
-- 
2.54.0

[PATCH v4 6/7] arm64: dts: allwinner: a100: reserve RAM for ATF

[Alexander Sverdlin]

Add reserved-memory node carving out Trusted Firmware-A region spanning
fixed 256K from physical address 0x40000000. Even though Allwinner ATF
itself passes the address range in the fdt to U-Boot, U-Boot currently
only reserves this memory internally, but doesn't carve out the region
in the fdt passed to Linux.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
---
Changelog:
v4:
- new patch

 arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
index 7cb06b19b5a5..d8391663fd1d 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
@@ -87,6 +87,22 @@ osc32k: osc32k-clk {
 		#clock-cells = <0>;
 	};
 
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		/*
+		 * 256 KiB reserved for Trusted Firmware-A (BL31).
+		 * This is added by BL31 itself, but some bootloaders fail
+		 * to propagate this into the DTB handed to kernels.
+		 */
+		secmon@40000000 {
+			reg = <0x0 0x40000000 0x0 0x40000>;
+			no-map;
+		};
+	};
+
 	timer {
 		compatible = "arm,armv8-timer";
 		interrupts = <GIC_PPI 13
-- 
2.54.0

[PATCH v4 7/7] arm64: dts: allwinner: A133: add support for Baijie Helper A133 board

[Alexander Sverdlin]

Baijie Helper A133 board is a development board around Baijie A133 Core
SBC. Features:

- 1/2/4GiB LPDDR4 DRAM
- 8/16/32GiB eMMC
- AXP707 PMIC
- USB-C OTG port in peripheral mode (via onboard hub)
- 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, LRADC-connected buttons.

UART1 can only be used for Bluetooth module, but BT-WiFi combo Allwinner
AW869A chip has no mainline driver currently.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
---
Changelog:
v4:
- renamed "sun50i-a133-baijie-helper.dtb" -> "sun50i-a133-helperboard.dtb"
- added "model" property into root of sun50i-a133-helperboard-core.dtsi
- added "cap-mmc-highspeed" and "max-frequency" into &mmc2
- added "x-powers,drive-vbus-en" and "*-supply" into &axp803
- dropped all "regulator-enable-ramp-delay" properties
- replaced &reg_dcdc3 with a "polyphased" comment
- exact DRAM voltage in &reg_dcdc5
- disabled &reg_dcdc6 to avoid "[   31.710641] dcdc6: disabling"
- added &reg_vdd5v "root" regulator
- added "disable-wp" into &mmc0
- commented &usb_otg
- assigned usb1_vbus-supply in &usbphy
v3:
- added my copyrights into the newly introduced DTs
- all DT nodes sorted alphabetically
- all always-on regulators commented/propetly named
- all regulators got proper voltages (not default ranges)
- ADC-sensed buttons K1..K5 added
- re-labelled "eth_phy" -> "rgmii_phy"
- usbphy 0 switched from host into peripheral mode (downstream from an
  onboard hub)
- typo sun50i-a133-baije-core.dtsi -> sun50i-a133-baijie-core.dtsi
v2:
- introduced baijie,helper-a133-core compatible for the Core (SoM) board

 arch/arm64/boot/dts/allwinner/Makefile        |   1 +
 .../sun50i-a133-helperboard-core.dtsi         | 197 ++++++++++++++++++
 .../dts/allwinner/sun50i-a133-helperboard.dts | 148 +++++++++++++
 3 files changed, 346 insertions(+)
 create mode 100644 arch/arm64/boot/dts/allwinner/sun50i-a133-helperboard-core.dtsi
 create mode 100644 arch/arm64/boot/dts/allwinner/sun50i-a133-helperboard.dts

diff --git a/arch/arm64/boot/dts/allwinner/Makefile b/arch/arm64/boot/dts/allwinner/Makefile
index d116864b6c2b..cf8434064b0d 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-$(CONFIG_ARCH_SUNXI) += sun50i-a133-helperboard.dtb
 dtb-$(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-helperboard-core.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a133-helperboard-core.dtsi
new file mode 100644
index 000000000000..545972d2324a
--- /dev/null
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a133-helperboard-core.dtsi
@@ -0,0 +1,197 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2025 Arm Ltd.
+ * Copyright (c) 2026 Alexander Sverdlin <alexander.sverdlin@gmail.com>
+ */
+
+/dts-v1/;
+
+#include "sun50i-a100.dtsi"
+#include "sun50i-a100-cpu-opp.dtsi"
+
+/{
+	model = "Baijie A133 HelperBoard Core";
+	compatible = "baijie,helperboard-a133-core",
+		     "allwinner,sun50i-a100";
+
+	aliases {
+		serial1 = &uart1;	/* BT module */
+	};
+};
+
+&cpu0 {
+	cpu-supply = <&reg_dcdc2>;
+};
+
+&lradc {
+	vref-supply = <&reg_aldo1>;
+};
+
+&mmc2 {
+	vmmc-supply = <&reg_dcdc1>;
+	vqmmc-supply = <&reg_eldo1>;
+	cap-mmc-highspeed;
+	cap-mmc-hw-reset;
+	max-frequency = <100000000>;
+	non-removable;
+	bus-width = <8>;
+	mmc-ddr-1_8v;
+	mmc-hs200-1_8v;
+	status = "okay";
+};
+
+&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>;
+	/*
+	 * PL0/PL1 are the I2C connection to PMIC, but it would create a
+	 * circular dependency:
+	 * vcc-pl-supply = <&reg_aldo3>;
+	 */
+};
+
+&r_i2c0 {
+	status = "okay";
+
+	axp803: pmic@34 {
+		compatible = "x-powers,axp803";
+		reg = <0x34>;
+		interrupt-parent = <&r_intc>;
+		interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
+		x-powers,drive-vbus-en;		/* set N_VBUSEN as output pin */
+		aldoin-supply = <&reg_vdd5v>;
+		dldoin-supply = <&reg_vdd5v>;
+		eldoin-supply = <&reg_vdd5v>;
+		fldoin-supply = <&reg_dcdc5>;
+		vin1-supply = <&reg_vdd5v>;
+		vin2-supply = <&reg_vdd5v>;
+		vin3-supply = <&reg_vdd5v>;
+		vin4-supply = <&reg_vdd5v>;
+		vin5-supply = <&reg_vdd5v>;
+		vin6-supply = <&reg_vdd5v>;
+		drivevbus-supply = <&reg_vdd5v>;
+	};
+};
+
+#include "axp803.dtsi"
+
+&ac_power_supply {
+	status = "okay";
+};
+
+&reg_aldo1 {
+	/* PLL + LRADC analog reference */
+	regulator-always-on;
+	regulator-min-microvolt = <1800000>;
+	regulator-max-microvolt = <1800000>;
+	regulator-name = "vcc-pll";
+};
+
+&reg_aldo2 {
+	/* LPDDR */
+	regulator-always-on;
+	regulator-min-microvolt = <1800000>;
+	regulator-max-microvolt = <1800000>;
+	regulator-name = "vdd18-lpddr";
+};
+
+&reg_aldo3 {
+	/*
+	 * Port L, but linking it to &pio node would create a circular
+	 * dependency because of PL0/PL1 I2C connection to PMIC
+	 */
+	regulator-always-on;
+	regulator-min-microvolt = <1800000>;
+	regulator-max-microvolt = <1800000>;
+	regulator-name = "vcc-pl";
+};
+
+&reg_dcdc1 {
+	/* Besides Port D it also powers analog part of USB IP and SoC I/O */
+	regulator-always-on;
+	regulator-min-microvolt = <3300000>;
+	regulator-max-microvolt = <3300000>;
+	regulator-name = "vcc-3v3";
+};
+
+&reg_dcdc2 {
+	regulator-always-on;
+	regulator-min-microvolt = <810000>;
+	regulator-max-microvolt = <1200000>;
+	regulator-name = "vdd-cpu";
+};
+
+/* DCDC3 is polyphased with DCDC2 */
+
+&reg_dcdc4 {
+	/* Digital part of USB IP, "System" SoC power rail */
+	regulator-always-on;
+	regulator-min-microvolt = <950000>;
+	regulator-max-microvolt = <950000>;
+	regulator-name = "vdd-sys";
+};
+
+&reg_dcdc5 {
+	regulator-always-on;
+	regulator-min-microvolt = <1100000>;
+	regulator-max-microvolt = <1100000>;
+	regulator-name = "vcc-dram";
+};
+
+/* DCDC6 unused */
+&reg_dcdc6 {
+	status = "disabled";
+};
+
+&reg_dldo1 {
+	regulator-min-microvolt = <1800000>;
+	regulator-max-microvolt = <1800000>;
+	regulator-name = "vcc-pg";
+};
+
+&reg_dldo2 {
+	regulator-min-microvolt = <1800000>;
+	regulator-max-microvolt = <1800000>;
+	regulator-name = "vcc-pe";
+};
+
+&reg_dldo3 {
+	regulator-min-microvolt = <2800000>;
+	regulator-max-microvolt = <2800000>;
+	regulator-name = "avdd-csi";
+};
+
+&reg_dldo4 {
+	regulator-min-microvolt = <2800000>;
+	regulator-max-microvolt = <2800000>;
+	regulator-name = "afvcc-csi";
+};
+
+&reg_eldo1 {
+	regulator-min-microvolt = <1800000>;
+	regulator-max-microvolt = <1800000>;
+	regulator-name = "vcc-pc";
+};
+
+&reg_eldo2 {
+	regulator-min-microvolt = <1200000>;
+	regulator-max-microvolt = <1200000>;
+	regulator-name = "dvdd-csi";
+};
+
+/* ELDO3 unused */
+
+&reg_fldo1 {
+	/* CPUS power rail */
+	regulator-always-on;
+	regulator-min-microvolt = <900000>;
+	regulator-max-microvolt = <900000>;
+	regulator-name = "vdd-cpus";
+};
+
+/* reg_drivevbus unused */
diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a133-helperboard.dts b/arch/arm64/boot/dts/allwinner/sun50i-a133-helperboard.dts
new file mode 100644
index 000000000000..694c0cacf906
--- /dev/null
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a133-helperboard.dts
@@ -0,0 +1,148 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2025 Arm Ltd.
+ * Copyright (c) 2026 Alexander Sverdlin <alexander.sverdlin@gmail.com>
+ */
+
+/dts-v1/;
+
+#include "sun50i-a133-helperboard-core.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/linux-event-codes.h>
+#include <dt-bindings/leds/common.h>
+
+/{
+	model = "Baijie HelperBoard A133";
+	compatible = "baijie,helperboard-a133",
+		     "baijie,helperboard-a133-core",
+		     "allwinner,sun50i-a100";
+
+	aliases {
+		serial0 = &uart0;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led {
+			function = LED_FUNCTION_INDICATOR;
+			color = <LED_COLOR_ID_GREEN>;
+			gpios = <&pio 7 13 GPIO_ACTIVE_LOW>;	/* PH13 */
+		};
+	};
+
+	reg_vdd5v: vdd5v {
+		/* board wide 5V supply from a 12V->5V regulator */
+		compatible = "regulator-fixed";
+		regulator-name = "vdd-5v";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		regulator-always-on;
+	};
+};
+
+&ehci1 {
+	status = "okay";
+};
+
+&emac0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&rgmii0_pins>;
+	phy-handle = <&rgmii_phy>;
+	phy-mode = "rgmii-id";
+	allwinner,rx-delay-ps = <200>;
+	allwinner,tx-delay-ps = <200>;
+	status = "okay";
+};
+
+&lradc {
+	wakeup-source;
+	status = "okay";
+
+	button-115 {
+		label = "K1";
+		linux,code = <KEY_1>;
+		channel = <0>;
+		voltage = <114607>;
+	};
+
+	button-235 {
+		label = "K2";
+		linux,code = <KEY_2>;
+		channel = <0>;
+		voltage = <234783>;
+	};
+
+	button-360 {
+		label = "K3";
+		linux,code = <KEY_3>;
+		channel = <0>;
+		voltage = <360000>;
+	};
+
+	button-476 {
+		label = "K4";
+		linux,code = <KEY_4>;
+		channel = <0>;
+		voltage = <476471>;
+	};
+
+	button-592 {
+		label = "K5";
+		linux,code = <KEY_5>;
+		channel = <0>;
+		voltage = <591946>;
+	};
+};
+
+&mdio0 {
+	reset-gpios = <&pio 7 11 GPIO_ACTIVE_LOW>;	/* PH11 */
+	reset-delay-us = <10000>;
+	reset-post-delay-us = <150000>;
+
+	rgmii_phy: ethernet-phy@1 {
+		compatible = "ethernet-phy-ieee802.3-c22";
+		reg = <1>;
+	};
+};
+
+&mmc0 {
+	vmmc-supply = <&reg_dcdc1>;
+	cd-gpios = <&pio 5 6 GPIO_ACTIVE_LOW>;	/* PF6 */
+	bus-width = <4>;
+	disable-wp;
+	status = "okay";
+};
+
+&ohci1 {
+	status = "okay";
+};
+
+&rgmii0_pins {
+	drive-strength = <30>;
+};
+
+&uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_pb_pins>;
+	status = "okay";
+};
+
+&usb_otg {
+	/*
+	 * Connected to a downstream port of an onboard hub, therefore only
+	 * "peripheral" mode will work here.
+	 */
+	dr_mode = "peripheral";
+	status = "okay";
+};
+
+&usbphy {
+	usb1_vbus-supply = <&reg_vdd5v>;
+	status = "okay";
+};
-- 
2.54.0

Re: [PATCH v4 4/7] dt-bindings: input: sun4i-lradc-keys: Add A100/A133 compatible

[Conor Dooley]

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

[-- Attachment #2: signature.asc --]
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Re: [PATCH v4 1/7] arm64: defconfig: Enable Allwinner LRADC input driver

[Jernej Škrabec]

Dne petek, 5. junij 2026 ob 09:09:15 Srednjeevropski poletni čas je Alexander Sverdlin napisal(a):
> Enable Allwinner LRADC input driver as module to support buttons on Baijie
> HelperBoard A133.
> 
> Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>

Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>

Best regards,
Jernej Skrabec

Re: [PATCH v4 5/7] arm64: dts: allwinner: a100: Add LRADC node

[Jernej Škrabec]

Dne petek, 5. junij 2026 ob 09:09:19 Srednjeevropski poletni čas je Alexander Sverdlin napisal(a):
> A100/A133 SoCs feature a Low Rate ADC (LRADC) for Key application.
> 
> Specs:
> - Power supply voltage: 1.8 V
> - Reference voltage: 1.35 V
> - Interrupt support
> - Support Hold Key and General Key
> - Support normal, continue and single work mode
> - 6-bits resolution, sample rate up to 2 kHz
> - Voltage input range between 0 and 1.35 V
> 
> Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
> ---
> Changelog:
> v4:
> - added allwinner,sun50i-a100-lradc compatible
> v3:
> - new patch
> 
>  arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
> index b3fb1e0ee796..7cb06b19b5a5 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
> @@ -466,6 +466,15 @@ ths: thermal-sensor@5070400 {
>  			#thermal-sensor-cells = <1>;
>  		};
>  
> +		lradc: lradc@5070800 {
> +			compatible = "allwinner,sun50i-a100-lradc", "allwinner,sun50i-r329-lradc";

Break this into two lines, like usb_otg below. With that:
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>

Best regards,
Jernej Skrabec

> +			reg = <0x05070800 0x400>;
> +			interrupts = <GIC_SPI 22 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&ccu CLK_BUS_LRADC>;
> +			resets = <&ccu RST_BUS_LRADC>;
> +			status = "disabled";
> +		};
> +
>  		usb_otg: usb@5100000 {
>  			compatible = "allwinner,sun50i-a100-musb",
>  				     "allwinner,sun8i-a33-musb";
> 

Re: [PATCH v4 6/7] arm64: dts: allwinner: a100: reserve RAM for ATF

[Jernej Škrabec]

Dne petek, 5. junij 2026 ob 09:09:20 Srednjeevropski poletni čas je Alexander Sverdlin napisal(a):
> Add reserved-memory node carving out Trusted Firmware-A region spanning
> fixed 256K from physical address 0x40000000. Even though Allwinner ATF
> itself passes the address range in the fdt to U-Boot, U-Boot currently
> only reserves this memory internally, but doesn't carve out the region
> in the fdt passed to Linux.
> 
> Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>

NAK. It is job of boot procedure to properly inject TF-A reserved node.
Any issue should be fixed there.

Best regards,
Jernej Skrabec

> ---
> Changelog:
> v4:
> - new patch
> 
>  arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
> index 7cb06b19b5a5..d8391663fd1d 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
> @@ -87,6 +87,22 @@ osc32k: osc32k-clk {
>  		#clock-cells = <0>;
>  	};
>  
> +	reserved-memory {
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		ranges;
> +
> +		/*
> +		 * 256 KiB reserved for Trusted Firmware-A (BL31).
> +		 * This is added by BL31 itself, but some bootloaders fail
> +		 * to propagate this into the DTB handed to kernels.
> +		 */
> +		secmon@40000000 {
> +			reg = <0x0 0x40000000 0x0 0x40000>;
> +			no-map;
> +		};
> +	};
> +
>  	timer {
>  		compatible = "arm,armv8-timer";
>  		interrupts = <GIC_PPI 13
> 

Re: [PATCH v4 6/7] arm64: dts: allwinner: a100: reserve RAM for ATF

[Alexander Sverdlin]

Hi Jernej,

On Sat, 2026-06-13 at 10:22 +0200, Jernej Škrabec wrote:
> Dne petek, 5. junij 2026 ob 09:09:20 Srednjeevropski poletni čas je Alexander Sverdlin napisal(a):
> > Add reserved-memory node carving out Trusted Firmware-A region spanning
> > fixed 256K from physical address 0x40000000. Even though Allwinner ATF
> > itself passes the address range in the fdt to U-Boot, U-Boot currently
> > only reserves this memory internally, but doesn't carve out the region
> > in the fdt passed to Linux.
> > 
> > Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
> 
> NAK. It is job of boot procedure to properly inject TF-A reserved node.
> Any issue should be fixed there.


like in commit 0d17c865118881609ea7e381c7cadbb7979cc596
("arm64: dts: allwinner: Add Allwinner H616 .dtsi file")
    Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>

? ;-)

> Best regards,
> Jernej Skrabec
> 
> > ---
> > Changelog:
> > v4:
> > - new patch
> > 
> >   arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi | 16 ++++++++++++++++
> >   1 file changed, 16 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
> > index 7cb06b19b5a5..d8391663fd1d 100644
> > --- a/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
> > +++ b/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
> > @@ -87,6 +87,22 @@ osc32k: osc32k-clk {
> >   		#clock-cells = <0>;
> >   	};
> >   
> > +	reserved-memory {
> > +		#address-cells = <2>;
> > +		#size-cells = <2>;
> > +		ranges;
> > +
> > +		/*
> > +		 * 256 KiB reserved for Trusted Firmware-A (BL31).
> > +		 * This is added by BL31 itself, but some bootloaders fail
> > +		 * to propagate this into the DTB handed to kernels.
> > +		 */
> > +		secmon@40000000 {
> > +			reg = <0x0 0x40000000 0x0 0x40000>;
> > +			no-map;
> > +		};
> > +	};
> > +
> >   	timer {
> >   		compatible = "arm,armv8-timer";
> >   		interrupts = <GIC_PPI 13

-- 
Alexander Sverdlin.

Re: [PATCH v4 6/7] arm64: dts: allwinner: a100: reserve RAM for ATF

[Jernej Škrabec]

Dne sobota, 13. junij 2026 ob 10:34:42 Srednjeevropski poletni čas je Alexander Sverdlin napisal(a):
> Hi Jernej,
> 
> On Sat, 2026-06-13 at 10:22 +0200, Jernej Škrabec wrote:
> > Dne petek, 5. junij 2026 ob 09:09:20 Srednjeevropski poletni čas je Alexander Sverdlin napisal(a):
> > > Add reserved-memory node carving out Trusted Firmware-A region spanning
> > > fixed 256K from physical address 0x40000000. Even though Allwinner ATF
> > > itself passes the address range in the fdt to U-Boot, U-Boot currently
> > > only reserves this memory internally, but doesn't carve out the region
> > > in the fdt passed to Linux.
> > > 
> > > Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
> > 
> > NAK. It is job of boot procedure to properly inject TF-A reserved node.
> > Any issue should be fixed there.
> 
> 
> like in commit 0d17c865118881609ea7e381c7cadbb7979cc596
> ("arm64: dts: allwinner: Add Allwinner H616 .dtsi file")
>     Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
> 
> ? ;-)

I was against that too.

It's time to be fixed in bootloader.

Best regards,
Jernej

> 
> > Best regards,
> > Jernej Skrabec
> > 
> > > ---
> > > Changelog:
> > > v4:
> > > - new patch
> > > 
> > >   arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi | 16 ++++++++++++++++
> > >   1 file changed, 16 insertions(+)
> > > 
> > > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
> > > index 7cb06b19b5a5..d8391663fd1d 100644
> > > --- a/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
> > > +++ b/arch/arm64/boot/dts/allwinner/sun50i-a100.dtsi
> > > @@ -87,6 +87,22 @@ osc32k: osc32k-clk {
> > >   		#clock-cells = <0>;
> > >   	};
> > >   
> > > +	reserved-memory {
> > > +		#address-cells = <2>;
> > > +		#size-cells = <2>;
> > > +		ranges;
> > > +
> > > +		/*
> > > +		 * 256 KiB reserved for Trusted Firmware-A (BL31).
> > > +		 * This is added by BL31 itself, but some bootloaders fail
> > > +		 * to propagate this into the DTB handed to kernels.
> > > +		 */
> > > +		secmon@40000000 {
> > > +			reg = <0x0 0x40000000 0x0 0x40000>;
> > > +			no-map;
> > > +		};
> > > +	};
> > > +
> > >   	timer {
> > >   		compatible = "arm,armv8-timer";
> > >   		interrupts = <GIC_PPI 13
> 
> 

Re: [PATCH v4 7/7] arm64: dts: allwinner: A133: add support for Baijie Helper A133 board

[Jernej Škrabec]

Dne petek, 5. junij 2026 ob 09:09:21 Srednjeevropski poletni čas je Alexander Sverdlin napisal(a):
> Baijie Helper A133 board is a development board around Baijie A133 Core
> SBC. Features:
> 
> - 1/2/4GiB LPDDR4 DRAM
> - 8/16/32GiB eMMC
> - AXP707 PMIC
> - USB-C OTG port in peripheral mode (via onboard hub)
> - 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, LRADC-connected buttons.
> 
> UART1 can only be used for Bluetooth module, but BT-WiFi combo Allwinner
> AW869A chip has no mainline driver currently.
> 
> Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>

Schema validation passes, so:
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>

Best regards,
Jernej