[PATCH 4/4] arm64: dts: allwinner: add Teclast P85T tablet

From: Mikhail Kalashnikov

Date: Fri Sep 18 2026 - 13:03:49 EST

The Teclast P85T is an 8-inch tablet that was announced in 2023
based on the Allwinner A523 (sun55i) SoC.

Hardware summary:
- Allwinner A523, 8x Cortex-A55 (2 clusters)
- 4 GiB LPDDR3 DRAM
- 64 GiB eMMC
- microSD card slot
- AXP717 and AXP323 PMICs
- USB-C port wired to the USB2 OTG controller
- combined WiFi and Bluetooth module based on AIC8800 (SDIO+UART)
- 800x1280 MIPI-DSI panel (not supported in mainline yet)
- Silead GSL1680 touchscreen
- MiraMEMS DA280 accelerometer
- AXP717 battery/charger
- USB-C OTG port (also for charging)
- secure boot, but takes any key

This initial submission enables only what mainline supports today:
both PMICs, battery/charger, GPU (Panfrost), eMMC, SD card,
SDIO WiFi (can be used with out of tree driver), USB device (without
otg function), UART0 console, UART1 Bluetooth, I2C0 touchscreen, I2C1
accelerometer and the RTC with the external 32 kHz oscillator.

Display (DE/TCON/DSI), PWM backlight, audio codec, camera (CSI/VIN)
and LRADC keys are deliberately left out, as those blocks are
not supported in mainline yet.

The tablet uses secure boot, so it needs a signed TOC0 wrapped image to
boot, but it has no key hash burnt into the efuses, so it accepts an
image signed with any key. U-Boot support in progress.

Later, a tablet with an Allwinner A537 processor and 3 GB of DRAM was
released under the same name. This version is not supported by mainline.

Assisted-by: OpenCode:DeepSeek-V4.1-Flash
Signed-off-by: Mikhail Kalashnikov <iuncuim@xxxxxxxxx>
---
arch/arm64/boot/dts/allwinner/Makefile | 1 +
.../allwinner/sun55i-a523-teclast-p85t.dts | 420 ++++++++++++++++++
2 files changed, 421 insertions(+)
create mode 100644 arch/arm64/boot/dts/allwinner/sun55i-a523-teclast-p85t.dts

diff --git a/arch/arm64/boot/dts/allwinner/Makefile b/arch/arm64/boot/dts/allwinner/Makefile
index aa21f58a4..7025ba959 100644
--- a/arch/arm64/boot/dts/allwinner/Makefile
+++ b/arch/arm64/boot/dts/allwinner/Makefile
@@ -63,6 +63,7 @@ dtb-$(CONFIG_ARCH_SUNXI) += sun50i-h700-anbernic-rg35xx-2024.dtb
dtb-$(CONFIG_ARCH_SUNXI) += sun50i-h700-anbernic-rg35xx-h.dtb
dtb-$(CONFIG_ARCH_SUNXI) += sun50i-h700-anbernic-rg35xx-plus.dtb
dtb-$(CONFIG_ARCH_SUNXI) += sun50i-h700-anbernic-rg35xx-sp.dtb
+dtb-$(CONFIG_ARCH_SUNXI) += sun55i-a523-teclast-p85t.dtb
dtb-$(CONFIG_ARCH_SUNXI) += sun55i-a527-cubie-a5e.dtb
dtb-$(CONFIG_ARCH_SUNXI) += sun55i-h728-x96qpro+.dtb
dtb-$(CONFIG_ARCH_SUNXI) += sun55i-t527-avaota-a1.dtb
diff --git a/arch/arm64/boot/dts/allwinner/sun55i-a523-teclast-p85t.dts b/arch/arm64/boot/dts/allwinner/sun55i-a523-teclast-p85t.dts
new file mode 100644
index 000000000..38a9c98ec
--- /dev/null
+++ b/arch/arm64/boot/dts/allwinner/sun55i-a523-teclast-p85t.dts
@@ -0,0 +1,420 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR MIT)
+/*
+ * Copyright (C) 2026 Mikhail Kalashnikov <iuncuim@xxxxxxxxx>
+ */
+
+/dts-v1/;
+
+#include "sun55i-a523.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+
+/ {
+ model = "Teclast P85T";
+ compatible = "teclast,p85t", "allwinner,sun55i-a523";
+ chassis-type = "tablet";
+
+ aliases {
+ serial0 = &uart0;
+ };
+
+ battery: battery {
+ compatible = "simple-battery";
+ constant-charge-current-max-microamp = <800000>;
+ voltage-max-design-microvolt = <4400000>;
+ charge-full-design-microamp-hours = <5000000>;
+ energy-full-design-microwatt-hours = <19250000>;
+ };
+
+ chosen {
+ stdout-path = "serial0:115200n8";
+ };
+
+ ext_osc32k: ext-osc32k-clk {
+ #clock-cells = <0>;
+ compatible = "fixed-clock";
+ clock-frequency = <32768>;
+ clock-output-names = "ext_osc32k";
+ };
+
+ iio-hwmon {
+ compatible = "iio-hwmon";
+ io-channels = <&axp717_adc 3>, /* vsys_v */
+ <&axp717_adc 4>; /* pmic_temp */
+ };
+
+ reg_vcc5v: vcc5v {
+ /* board wide 5V supply from the USB-C connector */
+ compatible = "regulator-fixed";
+ regulator-name = "vcc-5v";
+ regulator-min-microvolt = <5000000>;
+ regulator-max-microvolt = <5000000>;
+ regulator-always-on;
+ };
+
+ reg_pio18: pio-18 {
+ compatible = "regulator-fixed";
+ regulator-name = "pio-18";
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ regulator-always-on;
+ };
+
+ reg_vmmc1: vmmc1 {
+ compatible = "regulator-fixed";
+ regulator-name = "vcc-wifi";
+ regulator-min-microvolt = <3300000>;
+ regulator-max-microvolt = <3300000>;
+ vin-supply = <&reg_aldo3>;
+ gpio = <&r_pio 0 7 GPIO_ACTIVE_HIGH>; /* PL7 */
+ enable-active-high;
+ };
+
+ wifi_pwrseq: pwrseq {
+ compatible = "mmc-pwrseq-simple";
+ reset-gpios = <&r_pio 1 1 GPIO_ACTIVE_LOW>; /* PM1 */
+ post-power-on-delay-ms = <200>;
+ };
+};
+
+&ehci0 {
+ status = "okay";
+};
+
+&gpu {
+ mali-supply = <&reg_dcdc2>;
+ status = "okay";
+};
+
+&i2c0 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&i2c0_pins>;
+ clock-frequency = <400000>;
+ status = "okay";
+
+ touchscreen@40 {
+ compatible = "silead,gsl1680";
+ reg = <0x40>;
+ interrupt-parent = <&pio>;
+ interrupts = <7 9 IRQ_TYPE_EDGE_FALLING>; /* PH9 */
+ power-gpios = <&pio 7 10 GPIO_ACTIVE_HIGH>; /* PH10 */
+ touchscreen-size-x = <1786>;
+ touchscreen-size-y = <1128>;
+ touchscreen-inverted-y;
+ touchscreen-swapped-x-y;
+ silead,max-fingers = <5>;
+ avdd-supply = <&reg_cldo2>;
+ };
+};
+
+&i2c1 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&i2c1_pins>;
+ status = "okay";
+
+ accelerometer@26 {
+ compatible = "miramems,da280";
+ reg = <0x26>;
+ interrupt-parent = <&pio>;
+ interrupts = <7 11 IRQ_TYPE_LEVEL_LOW>; /* PH11 */
+ };
+};
+
+&mmc0 {
+ vmmc-supply = <&reg_cldo3>;
+ cd-gpios = <&pio 5 6 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>; /* PF6 */
+ bus-width = <4>;
+ status = "okay";
+};
+
+&mmc1 {
+ vmmc-supply = <&reg_vmmc1>;
+ vqmmc-supply = <&reg_bldo1>;
+ mmc-pwrseq = <&wifi_pwrseq>;
+ bus-width = <4>;
+ non-removable;
+ status = "okay";
+
+ wifi@1 {
+ reg = <1>;
+ interrupt-parent = <&r_pio>;
+ interrupts = <1 0 IRQ_TYPE_LEVEL_LOW>; /* PM0 */
+ interrupt-names = "host-wake";
+ };
+};
+
+&mmc2 {
+ vmmc-supply = <&reg_cldo3>;
+ vqmmc-supply = <&reg_cldo1>;
+ bus-width = <8>;
+ non-removable;
+ cap-mmc-hw-reset;
+ mmc-ddr-1_8v;
+ mmc-hs200-1_8v;
+ status = "okay";
+};
+
+&ohci0 {
+ status = "okay";
+};
+
+&pio {
+ vcc-pc-supply = <&reg_pio18>;
+ vcc-pe-supply = <&reg_pio18>;
+ vcc-pf-supply = <&reg_pio18>;
+ vcc-pg-supply = <&reg_pio18>;
+};
+
+&r_i2c0 {
+ status = "okay";
+
+ axp717: pmic@34 {
+ compatible = "x-powers,axp717";
+ reg = <0x34>;
+ interrupt-controller;
+ #interrupt-cells = <1>;
+ interrupt-parent = <&nmi_intc>;
+ interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
+
+ vin1-supply = <&reg_vcc5v>;
+ vin2-supply = <&reg_vcc5v>;
+ vin3-supply = <&reg_vcc5v>;
+ vin4-supply = <&reg_vcc5v>;
+ aldoin-supply = <&reg_vcc5v>;
+ bldoin-supply = <&reg_vcc5v>;
+ cldoin-supply = <&reg_vcc5v>;
+
+ axp717_adc: adc {
+ compatible = "x-powers,axp717-adc";
+ #io-channel-cells = <1>;
+ };
+
+ battery-power {
+ compatible = "x-powers,axp717-battery-power-supply";
+ monitored-battery = <&battery>;
+ };
+
+ regulators {
+ /* Supplies the "little" cluster (1.0(?) GHz cores) */
+ reg_dcdc1: dcdc1 {
+ regulator-always-on;
+ regulator-min-microvolt = <900000>;
+ regulator-max-microvolt = <1160000>;
+ regulator-name = "vdd-cpul";
+ };
+
+ reg_dcdc2: dcdc2 {
+ regulator-always-on;
+ regulator-min-microvolt = <920000>;
+ regulator-max-microvolt = <920000>;
+ regulator-name = "vdd-gpu-sys";
+ };
+
+ reg_dcdc3: dcdc3 {
+ regulator-always-on;
+ regulator-min-microvolt = <1260000>;
+ regulator-max-microvolt = <1260000>;
+ regulator-name = "vdd-dram";
+ };
+
+ reg_dcdc4: dcdc4 {
+ regulator-min-microvolt = <1000000>;
+ regulator-max-microvolt = <1000000>;
+ regulator-name = "vdd-dcdc4";
+ };
+
+ reg_aldo1: aldo1 {
+ /* camera sensor AVDD */
+ regulator-min-microvolt = <2800000>;
+ regulator-max-microvolt = <2800000>;
+ regulator-name = "avdd-csi";
+ };
+
+ reg_aldo2: aldo2 {
+ /* camera sensor IOVDD */
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ regulator-name = "iovdd-csi";
+ };
+
+ reg_aldo3: aldo3 {
+ /* supplies the I2C pins for this PMIC and the WiFi module */
+ regulator-always-on;
+ regulator-min-microvolt = <3300000>;
+ regulator-max-microvolt = <3300000>;
+ regulator-name = "vcc-pl-pm";
+ };
+
+ reg_aldo4: aldo4 {
+ regulator-always-on;
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ regulator-name = "vcc-pll-dxco-avcc";
+ };
+
+ reg_bldo1: bldo1 {
+ /* WiFi module 1.8V */
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ regulator-name = "vcc-wifi-1v8";
+ };
+
+ reg_bldo2: bldo2 {
+ /* WiFi module 1.8V */
+ regulator-always-on;
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ regulator-name = "vcc-wifi-1v8-b";
+ };
+
+ reg_bldo3: bldo3 {
+ /* camera sensor DVDD/cameravdd */
+ regulator-min-microvolt = <2800000>;
+ regulator-max-microvolt = <2800000>;
+ regulator-name = "vcc-csi";
+ };
+
+ reg_bldo4: bldo4 {
+ /* camera sensor DVDD */
+ regulator-min-microvolt = <1200000>;
+ regulator-max-microvolt = <1200000>;
+ regulator-name = "dvdd-csi";
+ };
+
+ reg_cldo1: cldo1 {
+ /* codec CPVIN, SD/eMMC 1.8V IO */
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ regulator-name = "vcc-codec-sd";
+ };
+
+ reg_cldo2: cldo2 {
+ /* touch panel supply */
+ regulator-min-microvolt = <3300000>;
+ regulator-max-microvolt = <3300000>;
+ regulator-name = "vcc-ctp";
+ };
+
+ reg_cldo3: cldo3 {
+ /* SD/eMMC VMMC, codec VDD, UART0, g-sensor */
+ regulator-always-on;
+ regulator-min-microvolt = <3300000>;
+ regulator-max-microvolt = <3300000>;
+ regulator-name = "vcc-io-mmc";
+ };
+
+ reg_cldo4: cldo4 {
+ /* LCD panel supply */
+ regulator-min-microvolt = <3300000>;
+ regulator-max-microvolt = <3300000>;
+ regulator-name = "vcc-lcd";
+ };
+
+ reg_cpusldo: cpusldo {
+ /* supplies the management core */
+ regulator-always-on;
+ regulator-min-microvolt = <900000>;
+ regulator-max-microvolt = <900000>;
+ regulator-name = "vdd-cpus";
+ };
+ };
+
+ usb-power {
+ compatible = "x-powers,axp717-usb-power-supply";
+ input-current-limit-microamp = <1750000>;
+ };
+ };
+
+ axp323: pmic@36 {
+ compatible = "x-powers,axp323";
+ reg = <0x36>;
+ #interrupt-cells = <1>;
+ interrupt-controller;
+ interrupt-parent = <&nmi_intc>;
+ interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
+
+ vin1-supply = <&reg_vcc5v>;
+ vin2-supply = <&reg_vcc5v>;
+ vin3-supply = <&reg_vcc5v>;
+
+ regulators {
+ reg_aldo1_323: aldo1 {
+ regulator-always-on;
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ regulator-name = "vcc-aldo1-323";
+ };
+
+ reg_dldo1_323: dldo1 {
+ regulator-always-on;
+ regulator-min-microvolt = <3300000>;
+ regulator-max-microvolt = <3300000>;
+ regulator-name = "vcc-dldo1-323";
+ };
+
+ /* Supplies the "big" cluster (1.8 GHz cores) */
+ reg_dcdc1_323: dcdc1 {
+ regulator-always-on;
+ regulator-min-microvolt = <900000>;
+ regulator-max-microvolt = <1160000>;
+ regulator-name = "vdd-cpub";
+ };
+
+ /* DCDC2 is polyphased with DCDC1 */
+
+ reg_dcdc3_323: dcdc3 {
+ regulator-always-on;
+ regulator-min-microvolt = <900000>;
+ regulator-max-microvolt = <900000>;
+ regulator-name = "vdd-dcdc3";
+ };
+ };
+ };
+};
+
+&r_pio {
+/*
+ * Specifying the supply would create a circular dependency.
+ *
+ * vcc-pl-supply = <&reg_aldo3>;
+ */
+ vcc-pm-supply = <&reg_aldo3>;
+};
+
+&rtc {
+ clocks = <&r_ccu CLK_BUS_R_RTC>, <&osc24M>,
+ <&r_ccu CLK_R_AHB>, <&ext_osc32k>;
+ clock-names = "bus", "hosc", "ahb", "ext-osc32k";
+ assigned-clocks = <&rtc CLK_OSC32K>;
+ assigned-clock-rates = <32768>;
+};
+
+&uart0 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&uart0_pb_pins>;
+ status = "okay";
+};
+
+&uart1 {
+ /* Bluetooth HCI, 4-wire with RTS/CTS */
+ pinctrl-names = "default";
+ pinctrl-0 = <&uart1_pins>, <&uart1_rts_cts_pins>;
+ uart-has-rtscts;
+ status = "okay";
+};
+
+&usb_otg {
+ /*
+ * The USB-C port is the primary power supply; VBUS control is not
+ * wired in mainline (AXP717 has no drivevbus), so the port can only
+ * act as a USB device powered from the host side.
+ */
+ dr_mode = "peripheral";
+ status = "okay";
+};
+
+&usbphy {
+ usb0_vbus-supply = <&reg_vcc5v>;
+ status = "okay";
+};
--
2.55.0