[PATCH 0/2] Add device tree for Acer Swift Go Pro AI (SFA14-11)

[Kaipeng Zeng <kaipeng94@gmail.com>]

Introduce device tree for the Acer Swift Go Pro AI (SFA14-11).
It is a laptop based on the Qualcomm Snapdragon X Elite (X1E78100) SoC.

The work started with x1-crd.dtsi as initial template.
HDMI refers to ThinkPad T14s.
Bluetooth refers to x1-crd.dtsi from the ubuntu-concept kernel [1].
PWM brightness control refers to Ratizux's GitHub repository [2].

Tested on linux-next / Ubuntu 26.04 LTS
       
Tested and working devices:

 - NVMe
 - Keyboard & Touchpad
 - USB Type-A, Type-C
 - Battery & charging status
 - Internal display & Backlight brightness control
 - HDMI & Type-C display
 - Bluetooth & Wi-Fi
 - Webcam (usb_2)
 - GPU

The following are some known issues:

Battery:
Battery status works only when the following kernel configs are enabled:
CONFIG_BATTERY_QCOM_BATTMGR=y
CONFIG_QCOM_CPUCP_MBOX=y
Or the battery percentage and charging status disappear randomly.

Audio:
Neither the internal speakers nor headphone jack are detected by GNOME,
and both fail to output sound.
The sound card seems functional since audio playback via Bluetooth works
correctly.
Also, when manually enabling speakers via alsamixer and then running
speaker-test, speakers can only emit some electrical noise.

Fingerprint:
The fingerprint reader can be probed. Running lsusb shows:
Bus 002 Device 003: ID 3274:9003 Generic Realtek USB2.0 Finger Print Bridge.
However, currently, the libfprint in Ubuntu 26.04 desktop does not support
this device, so I cannot verify if the device actually works.

Corrupted Display after suspend:
Internal monitor, Type-C and HDMI displays would break when the laptop
resumes from suspend or after logging out, displaying corrupted graphics.

The following are some reference details:

Bluetooth (uart14):
I referred to x1-crd.dtsi from the ubuntu-concept kernel [1].

HDMI (hdmi-bridge, hdmi-connector):
I referred to x1e78100-lenovo-thinkpad-t14s.dtsi.

Backlight brightness control (pm8550_pwm, pm8550_gpios):
The configuration of pm8550_gpios refers to Ratizux's GitHub repository [2].
Although I could not find any hardware information to confirm this, the
backlight brightness control works, but it is inverted.
Since the pm8550_pwm does not support "PWM_POLARITY_INVERTED", I used a
descending order array for the brightness-level.
With this workaround, the backlight brightness control works as expected.

This is my first time trying to upstream something,
not sure if I am doing everything correctly.
Any reviews, comments or suggestions would be greatly appreciated!
Thanks a lot!

[1] https://git.launchpad.net/~ubuntu-concept/ubuntu/+source/linux/+git/resolute/log/?h=qcom-x1e-7.0
[2] https://github.com/Ratizux/linux-device-acer-sfa14-11.git

Kaipeng Zeng (2):
  dt-bindings: arm: qcom: Add Acer Swift Go Pro AI (SFA14-11)
  arm64: dts: qcom: Add support for Acer Swift Go Pro AI (SFA14-11)

 .../devicetree/bindings/arm/qcom.yaml         |    1 +
 arch/arm64/boot/dts/qcom/Makefile             |    1 +
 .../boot/dts/qcom/x1e78100-acer-sfa14-11.dts  | 1711 +++++++++++++++++
 3 files changed, 1713 insertions(+)
 create mode 100644 arch/arm64/boot/dts/qcom/x1e78100-acer-sfa14-11.dts


base-commit: 3ce97bd3c4f18608335e709c24d6a40e7036cab8
-- 
2.53.0