[PATCH v8 0/6] Add Intel LJCA device driver

[Ye Xiang <xiang.ye@xxxxxxxxx>]

Add driver for Intel La Jolla Cove Adapter (LJCA) device.
This is a USB-GPIO, USB-I2C and USB-SPI device. We add 4
drivers to support this device: a USB driver, a GPIO chip
driver, a I2C controller driver and a SPI controller driver.

---
v8:
 - ljca: use READ_ONCE to make the value of ibuf consistent.
 - gpio: inplement get_direction callback.
 - gpio: move kconfig item into `USB GPIO expanders` menu.

v7:
 - ljca: remove unused field `udev` in struct ljca_dev.
 - ljca: rename ljca module name to usb-ljca.
 - ljca: use CONFIG_ACPI to enclose acpi related code.
 - ljca/gpio/i2c/spi: align MACRO defination.

v6:
 - ljca: split LJCA USB driver into two commits: USB part and API part.
 - gpio/i2c/spi: use auxiliary bus for sub-module device enumeration instead of MFD.
 - move document patch for LJCA sysfs entry to the 3th patch of this patch series.
 - ljca: fix potential race condition when wait response timeout.
 - ljca: use devm_kzalloc to malloc ljca device struct. 

v5:
 - move ljca.h from drivers/include/mfd to drivers/include/usb.
 - ljca: fix a potential memory leak issue.
 - add a blank line before return to adust to kernel code style.
 - ljca: sysfs: split "cmd" to "ljca_dfu" and "ljca_trace_level".

v4:
 - move ljca.c from drivers/mfd to drivers/usb/misc folder.
 - fix index warning in sysfs-bus-devices-ljca.

v3:
 - spi: make ljca_spi_transfer inline and fix an endian issue.

v2:
 - ljca: remove reset command.
 - gpio/spi/i2c: add `default MFD_LJCA` in Kconfig.
 - gpio: add "select GPIOLIB_IRQCHIP" in Kconfig.

Ye Xiang (6):
  usb: Add support for Intel LJCA device
  usb: ljca: Add transport interfaces for sub-module drivers
  Documentation: Add ABI doc for attributes of LJCA device
  gpio: Add support for Intel LJCA USB GPIO driver
  i2c: Add support for Intel LJCA USB I2C driver
  spi: Add support for Intel LJCA USB SPI driver

 .../ABI/testing/sysfs-bus-usb-devices-ljca    |   36 +
 drivers/gpio/Kconfig                          |   12 +
 drivers/gpio/Makefile                         |    1 +
 drivers/gpio/gpio-ljca.c                      |  479 ++++++++
 drivers/i2c/busses/Kconfig                    |   11 +
 drivers/i2c/busses/Makefile                   |    1 +
 drivers/i2c/busses/i2c-ljca.c                 |  350 ++++++
 drivers/spi/Kconfig                           |   11 +
 drivers/spi/Makefile                          |    1 +
 drivers/spi/spi-ljca.c                        |  290 +++++
 drivers/usb/misc/Kconfig                      |   14 +
 drivers/usb/misc/Makefile                     |    1 +
 drivers/usb/misc/usb-ljca.c                   | 1068 +++++++++++++++++
 include/linux/usb/ljca.h                      |  102 ++
 14 files changed, 2377 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-usb-devices-ljca
 create mode 100644 drivers/gpio/gpio-ljca.c
 create mode 100644 drivers/i2c/busses/i2c-ljca.c
 create mode 100644 drivers/spi/spi-ljca.c
 create mode 100644 drivers/usb/misc/usb-ljca.c
 create mode 100644 include/linux/usb/ljca.h

-- 
2.34.1