[PATCH v5 0/3] Add support for OLED panel used on Snapdragon Lenovo T14s Gen6

[Christopher Obbard <christopher.obbard@linaro.org>]

The Snapdragon Lenovo T14s Gen6 can be bought with a number of different
panels. This patch series adds support for the OLED model which has a
Samsung ATNA40YK20 panel.

With this patch series the backlight of the OLED eDP panel does not
illuminate since the brightness is incorrectly read from the eDP panel
as (to be clear this is not a regression). This is fixed in [0].

[0]: https://lore.kernel.org/all/20250330-wip-obbardc-qcom-t14s-oled-panel-brightness-v6-1-84ad1cd1078a@linaro.org/

Signed-off-by: Christopher Obbard <christopher.obbard@linaro.org>
---
Changes in v5:
- Move edp_hpd_active from T14s DTS into SoC DTSI (Dmitry).
- Link to v4: https://lore.kernel.org/r/20250402-wip-obbardc-qcom-t14s-oled-panel-v4-0-41ba3f3739d0@linaro.org

Changes in v4:
- Rework HPD GPIO into eDP device rather than panel (Johan).
- Drop review tags for HPD GPIO patch.
- Link to v3: https://lore.kernel.org/r/20250327-wip-obbardc-qcom-t14s-oled-panel-v3-0-45d5f2747398@linaro.org

Changes in v3:
- Added review trailers from v2.
- Dropped dt-binding documentation patch (applied by Douglas Anderson into
  drm-misc-next).
- Dropped eDP maximum brightness patch (will be sent in separate
  series).
- Removed duplicate nodes in T14s OLED device tree.
- Reworked WIP comments from commit messages.
- Link to v2: https://lore.kernel.org/r/20250325-wip-obbardc-qcom-t14s-oled-panel-v2-0-e9bc7c9d30cc@linaro.org

Changes in v2:
- Use the existing atna33xc20 driver rather than panel-edp.
- Add eDP panel into OLED devicetree.
- Add patch to read the correct maximum brightness from the eDP panel.
- Link to v1: https://lore.kernel.org/r/20250320-wip-obbardc-qcom-t14s-oled-panel-v1-1-05bc4bdcd82a@linaro.org

---
Christopher Obbard (3):
      arm64: dts: qcom: x1e80100: add epd hpd pinctrl
      arm64: dts: qcom: x1e78100-t14s: add hpd gpio to dp controller
      arm64: dts: qcom: x1e78100-t14s-oled: add edp panel

 arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s-oled.dts | 8 ++++++++
 arch/arm64/boot/dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi     | 3 +++
 arch/arm64/boot/dts/qcom/x1e80100.dtsi                          | 5 +++++
 3 files changed, 16 insertions(+)
---
base-commit: b6ae34803e82511009e2b78dc4fd154330ecdc2d
change-id: 20250320-wip-obbardc-qcom-t14s-oled-panel-b74fed21d600

Best regards,
-- 
Christopher Obbard <christopher.obbard@linaro.org>