[v4,0/5] misc: Add mikroBUS driver

Message

Ayush Singh March 17, 2024, 7:37 p.m. UTC

MikroBUS is an open standard  developed by MikroElektronika for connecting
add-on boards to microcontrollers or microprocessors. It essentially
allows you to easily expand the functionality of your main boards using
these add-on boards.

This patchset adds mikroBUS as a Linux bus type and provides a driver to
parse and register the mikroBUS board using mikroBUS manifest.

The patchset is based on work originally done by Vaishnav.

Link: https://www.mikroe.com/mikrobus
Link: https://docs.beagleboard.org/latest/boards/beagleplay/
Link: https://lore.kernel.org/lkml/[e-mail]/ Patch v3

Changes v4:
- Better commit messages
- Remove clickID, serdev, pwm, regulator, clocks etc. Just the basic
  mikroBUS driver.
- Fix a lot of memory leaks, unused variables, etc.
- Create accompanying PR in Greybus Spec repository
- Switch to 80 columns formatting
- Some other fixes pointed out in v3

Changes in v3:
- Use phandle instead of busname for spi
- Use spi board info for registering new device
- Convert dt bindings to yaml
- Add support for clickID
- Code cleanup and style changes
- Additions required to spi, serdev, w1 and regulator subsystems

Changes in v2:
- support for adding mikroBUS ports from DT overlays,
- remove debug sysFS interface for adding mikrobus ports,
- consider extended pin usage/deviations from mikrobus standard
  specifications
- use greybus CPort protocol enum instead of new protocol enums
- Fix cases of wrong indentation, ignoring return values, freeing allocated
  resources in case of errors and other style suggestions in v1 review.

Ayush Singh (5):
  dt-bindings: misc: Add mikrobus-connector
  spi: Make of_find_spi_controller_by_node() available
  greybus: Add mikroBUS manifest types
  mikrobus: Add mikroBUS driver
  dts: ti: k3-am625-beagleplay: Add mikroBUS

 .../connector/mikrobus-connector.yaml         | 113 +++
 MAINTAINERS                                   |   7 +
 .../arm64/boot/dts/ti/k3-am625-beagleplay.dts |  80 +-
 drivers/misc/Kconfig                          |   1 +
 drivers/misc/Makefile                         |   1 +
 drivers/misc/mikrobus/Kconfig                 |  15 +
 drivers/misc/mikrobus/Makefile                |   5 +
 drivers/misc/mikrobus/mikrobus_core.c         | 696 ++++++++++++++++++
 drivers/misc/mikrobus/mikrobus_core.h         | 151 ++++
 drivers/misc/mikrobus/mikrobus_manifest.c     | 503 +++++++++++++
 drivers/misc/mikrobus/mikrobus_manifest.h     |  29 +
 drivers/spi/spi.c                             | 206 +++---
 include/linux/greybus/greybus_manifest.h      |  49 ++
 include/linux/spi/spi.h                       |   4 +
 14 files changed, 1750 insertions(+), 110 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/connector/mikrobus-connector.yaml
 create mode 100644 drivers/misc/mikrobus/Kconfig
 create mode 100644 drivers/misc/mikrobus/Makefile
 create mode 100644 drivers/misc/mikrobus/mikrobus_core.c
 create mode 100644 drivers/misc/mikrobus/mikrobus_core.h
 create mode 100644 drivers/misc/mikrobus/mikrobus_manifest.c
 create mode 100644 drivers/misc/mikrobus/mikrobus_manifest.h


base-commit: 61996c073c9b070922ad3a36c981ca6ddbea19a5