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[v2,0/4] arm64: dts: allwinner: add Teclast P85T (A523) support

Message ID 20261001022415.913959-1-iuncuim@gmail.com (mailing list archive)
Headers
Series arm64: dts: allwinner: add Teclast P85T (A523) support |

Message

Mikhail Kalashnikov Oct. 1, 2026, 2:24 a.m. UTC 
This series adds initial support for the Teclast P85T, an 8-inch tablet
based on the Allwinner A523 (sun55i) SoC.

This initial submission enables only what has a binding today.
Display (DE/TCON/DSI), PWM backlight, audio codec, camera (CSI/VIN)
and LRADC keys are deliberately left out, as those blocks is not ready
yet. They will be sent separately.

Patches 1 and 2 overlap with Andre's series
https://lore.kernel.org/linux-sunxi/20260914210115.28151-1-andre.przywara@arm.com/T/#ma8a2554315eccbccdb15ee7ac212a4d0afb45a5c
They are included for compatibility and differ only in the full company
name in the description.

Touchscreen operation requires firmware extracted from the Android
firmware; the file will be added to a public repository later.

The touchscreen values below were obtained experimentally via evtest
and may be inaccurate:
  touchscreen-size-x = <1786>;
  touchscreen-size-y = <1128>;

With the values below the touchscreen and display coordinates match:
  touchscreen-inverted-y;
  touchscreen-swapped-x-y;

The battery values are taken from the battery label
(5000 mAh, 4.4 V max charge) and the Android DTB
(pmu_runtime_chgcur = <0x320>, i.e. 800 mA safe charge current).

U-Boot support requires an LPDDR3 driver for the A523, which will be
sent a bit later.

A ready-to-use image with working display, audio and touchscreen can be
found on the Manjaro forum. Patches will be added as other contributors
add their parts.

Changes since v1 [1]:
  - Added Reviewed-by from Andre Przywara for patch 3;
  - Replaced the dummy 1.8V pio-18 regulator with the real PMIC rails;
  - Dropped reg_dcdc4: no consumers, the kernel would turn it off;
  - Dropped AXP323 aldo1/dldo1: no consumers - the board is verified
    to work with both rails disabled;
  - Renamed bldo2 to "vcc-dram-1v8" (needs to be kept always-on).
  - Renamed cldo1 from "vcc-codec-sd" to "vcc-codec-mmc";
  - Described AXP323 dcdc3 as the RISC-V management core supply, like
    on the other A523 boards;
  - USB: removed the inbound 5V rail from usb0_vbus-supply and dropped
    ehci0/ohci0; the port is works like peripheral-only, using
    usb0_vbus_det-gpios for VBUS sensing;
  - Dropped the iio-hwmon node due to invalid values;
  - Commit message wording: those blocks "don't have a binding yet".

[1] https://lore.kernel.org/linux-sunxi/20260918165414.1129076-1-iuncuim@gmail.com/

Based on 7.3-rc3.

Mikhail Kalashnikov (4):
  dt-bindings: vendor-prefixes: Add vendor prefix for Teclast
  dt-bindings: arm: sunxi: Add Teclast P85T tablet
  arm64: dts: allwinner: sun55i-a523: add I2C0 and I2C1 pin groups
  arm64: dts: allwinner: add Teclast P85T tablet

 .../devicetree/bindings/arm/sunxi.yaml        |   5 +
 .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
 arch/arm64/boot/dts/allwinner/Makefile        |   1 +
 .../allwinner/sun55i-a523-teclast-p85t.dts    | 386 ++++++++++++++++++
 .../arm64/boot/dts/allwinner/sun55i-a523.dtsi |  18 +
 5 files changed, 412 insertions(+)
 create mode 100644 arch/arm64/boot/dts/allwinner/sun55i-a523-teclast-p85t.dts