[v6,0/3] platform: arm64: Huawei Matebook E Go embedded controller

This adds binding, drivers and the DT support for the Huawei Matebook E Go
(sc8280xp-based) Embedded Controller which is also found in Huawei Matebook
E Go LTE (sc8180x-based), but I don't have the sc8180x one to perform
tests, so this series enable support for sc8280xp variant only, this series
provides the following features:

- battery and charger information report
- charging thresholds control
- FN lock (An alternative method)
- LID switch detection
- Temperature sensors
- USB Type-C altmode
- USB Type-C PD(high power)

Thanks to the work of Bjorn and Dmitry([1]), the work of Nikita([2]),
writing a EC driver won't be suffering. This work refers a lot to their
work, also, many other works. I mentioned them in commit messages.

Depends: https://lore.kernel.org/linux-arm-msm/20241220160530.444864-1-mitltlatltl@gmail.com

[1] https://lore.kernel.org/all/20240614-yoga-ec-driver-v7-0-9f0b9b40ae76@linaro.org/
[2] https://lore.kernel.org/all/20240315-aspire1-ec-v5-0-f93381deff39@trvn.ru/

base-commit: 853d1f41ba73e78d22e7075d9a95670aab187eba

Signed-off-by: Pengyu Luo <mitltlatltl@gmail.com>
---
Changes in v6:
- refactor one ternary operator expression (Ilpo)
- replace one expression with &= (Ilpo)
- use devm_mutex_init() instead of mutex_init() (Ilpo)
- add Reviewed-by tag for devicetree (Konrad)
- add explicit cast (void *) to fix warnings when compiling
- rebased on tag next-20250123
- Link to v5: https://lore.kernel.org/linux-arm-msm/20250117140348.180681-1-mitltlatltl@gmail.com

Changes in v5 RESEND:
- rebased on tag next-20250120
- Link to v5: https://lore.kernel.org/linux-arm-msm/20250117140348.180681-1-mitltlatltl@gmail.com

Changes in v5:
- handle return code of i2c_transfer() (Bryan)
- rename threshold validatition function (Bryan)
- add enumerates and defines for registers (Bryan)
- drop extra line in header (Heikki)
- add Reviewed-by tag for devicetree (Krzysztof)
- Link to v4: https://lore.kernel.org/linux-arm-msm/20250116111559.83641-1-mitltlatltl@gmail.com

Changes in v4:
- use new API to register hwmon device instead of the deprecated one. (Guenter)
- add Reviewed-by tag for dt-binding (Krzysztof)
- drop unnecessary header (Ilpo)
- use guard mutex (Ilpo)
- improve comments and naming (Ilpo)
- add a shallow copy version of extr_resp() (Ilpo)
- add functions to handle resp and req whose size is 1
- drop PSY and UCSI subdrivers, commit them once the base driver is upstreamed
- Link to v3: https://lore.kernel.org/linux-arm-msm/20250113175049.590511-1-mitltlatltl@gmail.com

Changes in v3:
- Link to v2: https://lore.kernel.org/linux-arm-msm/20250105174159.227831-1-mitltlatltl@gmail.com

dt-binding:
- drop generic compatibles. (Krzysztof)
- remove '+' to use literal block style. (Krzysztof)

ec:
- take struct gaokun_ucsi_reg as parameter (Heikki)
- add almost all kernel doc comments (Krzysztof, Heikki)

ucsi:
- drop unnecessary ucsi quirks (Dmitry)
- add UCSI v1.0 to ucsi.h (Heikki)
- use gaokun_ucsi_read_cci() to read cci directly (Heikki)
- drop unnecessary gaokun_ucsi_get_port_num (Heikki)
- rename member port_num => num_ports (Heikki)
- fix completion, forgot to signal threads in previous version

dt:
- fix indentation (Konrad)
- add a link between role switch and connector

Changes in v2:
- Link to v1: https://lore.kernel.org/linux-arm-msm/20241227171353.404432-1-mitltlatltl@gmail.com

global:
- drop qcom's products(i.e. sc8180x, sx8280xp) everywhere, use 'product'-based instead(Krzysztof, Bryan)
- drop Cc Nikita Travkin, we had discussed the device in PM.
- add myself to MAINTAINERS

dt-binding:
- fix building (Rob Herring (Arm))
- remove unnecessary code (Krzysztof)
- add bugzilla documentation, insights of gaokun(see [1] or patch[1/5]) (Krzysztof, Aiqun(Maria))
- explain the difference between PMIC GLink and gaokun EC (Aiqun(Maria))

ec:
- use Linux style comments (Krzysztof)
- add a comment for mutex lock (Krzysztof)
- add more kerneldoc for exported functions (Krzysztof)
- eliminate unnecessary conditions (Bryan)
- add a macro for check thresholds (Bryan)
- improve English (Bryan)
- use existing sysfs interface(hwmon, psy) whenever possible (Krzysztof)
- use __le16 and related endianess conversion function for temp data (Ilpo)
- drop alias for packet headers (Ilpo)
- avoid hardcoding i2c msgs size (Aiqun(Maria))
- add a comment for the sleep in critial region (Bryan, Aiqun(Maria))
- use macro to construct packet (Bryan, Aiqun(Maria))

wmi:
- dropped

ucsi:
- reorder headers (Bryan)
- a comment for the orientation map macro (Bryan)
- make mux mode map more explicit(minus six is very clear now) (Bryan, Dmitry)
- handle port update exceptions return (Bryan)
- a comment for the UCSI quirks (Dmitry)
- use the inline hint for the short register function (Dmitry)
- use the API with delay to handle register instead of a direct sleep (Bryan)
- handle unfinished initialization early

psy:
- add charging related sysfs to here (Krzysztof, Dmitry)
- document ABI for power_supply sysfs (Krzysztof)
- drop charging threshold, use smart charging instead

dts:
- correct indentation, properties' order. (Konrad)

Pengyu Luo (3):
  dt-bindings: platform: Add Huawei Matebook E Go EC
  platform: arm64: add Huawei Matebook E Go EC driver
  arm64: dts: qcom: gaokun3: Add Embedded Controller node

 .../bindings/platform/huawei,gaokun-ec.yaml   | 124 +++
 MAINTAINERS                                   |   7 +
 .../boot/dts/qcom/sc8280xp-huawei-gaokun3.dts | 163 ++++
 drivers/platform/arm64/Kconfig                |  21 +
 drivers/platform/arm64/Makefile               |   1 +
 drivers/platform/arm64/huawei-gaokun-ec.c     | 825 ++++++++++++++++++
 .../linux/platform_data/huawei-gaokun-ec.h    |  79 ++
 7 files changed, 1220 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/platform/huawei,gaokun-ec.yaml
 create mode 100644 drivers/platform/arm64/huawei-gaokun-ec.c
 create mode 100644 include/linux/platform_data/huawei-gaokun-ec.h