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

Ayush Singh
2024-06-27T16:28:47Z

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>