[PATCH 0/4] Driver for Apple Z2 touchscreens.

[Sasha Finkelstein via B4 Relay]

Hi.

This series adds support for Apple touchscreens using the Z2 protocol.
Those are used as the primary touchscreen on mobile Apple devices, and for the
touchbar on laptops using the M-series chips. (T1/T2 laptops have a coprocessor
in charge of speaking Z2 to the touchbar).

Originally sent as a RFC at https://lore.kernel.org/all/20230223-z2-for-ml-v1-0-028f2b85dc15@gmail.com/
The changes since then mostly address the review feedback, but also
add another machine that has this specific controller.

The extra gpio needed to be toggled turned out to be a quirk of the
j293, normal CS is unusable on it, and a gpio has to be used instead.
(j493 does not have this quirk)

Signed-off-by: Sasha Finkelstein <fnkl.kernel at gmail.com>
---
Sasha Finkelstein (4):
      dt-bindings: input: touchscreen: Add Z2 controller
      input: apple_z2: Add a driver for Apple Z2 touchscreens
      arm64: dts: apple: Add touchbar digitizer nodes
      MAINTAINERS: Add entries for Apple Z2 touchscreen driver

 .../input/touchscreen/apple,z2-multitouch.yaml     |  83 ++++
 MAINTAINERS                                        |   2 +
 arch/arm64/boot/dts/apple/t8103-j293.dts           |  24 +
 arch/arm64/boot/dts/apple/t8103.dtsi               |  19 +
 arch/arm64/boot/dts/apple/t8112-j493.dts           |  20 +
 arch/arm64/boot/dts/apple/t8112.dtsi               |  14 +
 drivers/input/touchscreen/Kconfig                  |  13 +
 drivers/input/touchscreen/Makefile                 |   1 +
 drivers/input/touchscreen/apple_z2.c               | 495 +++++++++++++++++++++
 9 files changed, 671 insertions(+)
---
base-commit: 9f16d5e6f220661f73b36a4be1b21575651d8833
change-id: 20241124-z2-c012b528ea0d