[PATCH v5 0/7] misc: Add mikroBUS driver

[Ayush Singh <ayush@beagleboard.org>]

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 device tree infrastructure.

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/all/20240317193714.403132-1-ayushdevel1325@gmail.com/ Patch v4

Changes v5
- Complete rewrite to use device tree instead of mikroBUS manifest.
- Only support for SPI.
- Adds `mikrobus,spi` compatible property.

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.

Signed-off-by: Ayush Singh <ayush@beagleboard.org>
---
Ayush Singh (7):
      dt-bindings: connector: Add mikrobus-connector
      dt-bindings: mikrobus: Add mikrobus board base
      dt-bindings: mikrobus: Add mikrobus-spi binding
      spi: Make of_find_spi_controller_by_node() available
      spi: Make of_register_spi_device() available
      mikrobus: Add mikroBUS driver
      dts: ti: k3-am625-beagleplay: Add mikroBUS

 .../bindings/connector/mikrobus-connector.yaml     | 107 ++++++
 .../bindings/mikrobus/mikrobus-board.yaml          |  20 ++
 .../devicetree/bindings/mikrobus/mikrobus-spi.yaml |  37 +++
 MAINTAINERS                                        |   9 +
 arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts     |  94 +++++-
 drivers/misc/Kconfig                               |  16 +
 drivers/misc/Makefile                              |   1 +
 drivers/misc/mikrobus.c                            | 361 +++++++++++++++++++++
 drivers/spi/spi.c                                  | 209 ++++++------
 include/linux/spi/spi.h                            |   7 +
 10 files changed, 750 insertions(+), 111 deletions(-)
---
base-commit: f76698bd9a8ca01d3581236082d786e9a6b72bb7
change-id: 20240627-mikrobus-scratch-spi-ad8c98dcec98

Best regards,
-- 
Ayush Singh <ayush@beagleboard.org>