[v5,0/9] Support Spi in i2c-multi-instantiate driver

Message

Stefan Binding Jan. 21, 2022, 2:32 p.m. UTC

Add support for SPI bus in the i2c-multi-instantiate driver as
upcoming laptops will need to multi instantiate SPI devices from
a single device node, which has multiple SpiSerialBus entries at
the ACPI table.

With the new SPI support, i2c-multi-instantiate becomes
bus-multi-instantiate and is moved to the ACPI folder.

The intention is to support the SPI bus by re-using the current
I2C multi instantiate, instead of creating a new SPI multi
instantiate, to make it possible for peripherals that can be
controlled by I2C or SPI to have the same HID at the ACPI table.

The new driver (serial multi instantiate, smi) checks for the
hard-coded bus type and returns -ENODEV in case of zero devices
found for that bus. In the case of automatic bus detection, 
the driver will give preference to I2C.

The expectation is for a device node in the ACPI table to have
multiple I2cSerialBus only or multiple SpiSerialBus only, not
a mix of both; and for the case where there are both entries in
one device node, only the I2C ones would be probed.

This new serial multi instantiate will be used in CS35L41 HDA new
driver.

Changes since V4:
 - renamed bus-multi-instantiate to serial-multi-instantiate
 - various minor fixes in serial-multi-instantiate
 - fix returns in serial-multi-instantiate
 - removed unnecessary stubs in spi.h
 - re-order SSIDs in patch_realtek.c

Lucas Tanure (4):
  platform/x86: i2c-multi-instantiate: Rename it for a generic serial
    driver name
  platform/x86: serial-multi-instantiate: Reorganize I2C functions
  ALSA: hda/realtek: Add support for HP Laptops
  ACPI / scan: Create platform device for CS35L41

Stefan Binding (5):
  spi: Make spi_alloc_device and spi_add_device public again
  spi: Create helper API to lookup ACPI info for spi device
  spi: Support selection of the index of the ACPI Spi Resource before
    alloc
  spi: Add API to count spi acpi resources
  platform/x86: serial-multi-instantiate: Add SPI support

 MAINTAINERS                                   |   4 +-
 drivers/acpi/scan.c                           |  16 +-
 drivers/platform/x86/Kconfig                  |  14 +-
 drivers/platform/x86/Makefile                 |   2 +-
 drivers/platform/x86/i2c-multi-instantiate.c  | 174 ---------
 .../platform/x86/serial-multi-instantiate.c   | 346 ++++++++++++++++++
 drivers/spi/spi.c                             | 137 ++++++-
 include/linux/spi/spi.h                       |  20 +
 sound/pci/hda/patch_realtek.c                 |  43 ++-
 9 files changed, 549 insertions(+), 207 deletions(-)
 delete mode 100644 drivers/platform/x86/i2c-multi-instantiate.c
 create mode 100644 drivers/platform/x86/serial-multi-instantiate.c