UP Squared board drivers

Hi all,

This series adds platform support for AAEON's UP Squared, a x86 SBC based on Apollo Lake [1]. Specifically, it enables control for the board pin headers and for the LEDs, as both of these features are only available behind a FPGA-based platform controller.

This is structured around a MFD driver that provides a regmap interface to that platform controller to each MFD cell.

The series is carved out from an out-of-tree support patchset, initially written for the original UP Board [2] and then extended through the past year to support new entries in the lineup (UP Board, UP Squared and UP Core) [3].

Here we only submit support for UP Squared to simplify review. Still, the driver is designed so that it can easily gain support for the other boards.

V1 was originally submitted by Javier Arteaga in April 2018 as an RFC [4].

The relevant ACPI SSDT from UP Squared can be found here: [5]

[1]: http://www.up-board.org/upsquared/specifications-up2/
[2]: https://lkml.kernel.org/r/[email protected]
[3]: https://github.com/emutex/ubilinux-kernel/commits/upboard-4.9
[4]: https://lore.kernel.org/lkml/[email protected]/
[5]: https://gist.github.com/Dan-Emutex/6382c25f4b8b8cdd80e6056889cdf48b

V3:
* Javier's address is no longer valid. Replaced From: with my own address.
* Added error checks in LEDs driver, suggested by Jacek Anaszewski
* Added minor tidy-ups in MFD and pinctrl drivers, suggested by Andy Shevchenko
* Added link to relevant ACPI extract above [5]

V2:
* Rewrote regmap r/w handlers to avoid duplication and improve readability
* Simplified data passing between MFD parent and child device drivers
* Removed incorrect __init attribute from probe functions
* Moved MFD cell definitions into same patch as MFD driver and simplified them
* Promoted some dev_dbg instances to dev_err for probe error cases
* Decoupled MFD cell reference from ACPI driver data
* Miscellanous coding style improvements
* Fixed license mismatches

Dan O'Donovan (3):
mfd: upboard: Add UP2 platform controller driver
leds: upboard: Add LED support
pinctrl: upboard: Add UP2 pinctrl and gpio driver

 drivers/leds/Kconfig              |  10 +
 drivers/leds/Makefile             |   1 +
 drivers/leds/leds-upboard.c       | 103 ++++++++
 drivers/mfd/Kconfig               |  17 ++
 drivers/mfd/Makefile              |   1 +
 drivers/mfd/upboard.c             | 336 ++++++++++++++++++++++++++
 drivers/pinctrl/Kconfig           |  13 +
 drivers/pinctrl/Makefile          |   1 +
 drivers/pinctrl/pinctrl-upboard.c | 496 ++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/upboard.h       |  44 ++++
 10 files changed, 1022 insertions(+)
 create mode 100644 drivers/leds/leds-upboard.c
 create mode 100644 drivers/mfd/upboard.c
 create mode 100644 drivers/pinctrl/pinctrl-upboard.c
 create mode 100644 include/linux/mfd/upboard.h

2.7.4


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