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 (Bus multi instantiate, bmi) 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 bus multi instantiate will be used in CS35L41 HDA new driver. Changes since V2: - Fix review comments in bus-multi-instantiate - Modified spi code to export new helper to allocate spi device based on ACPI - Add api in spi code to count number of spi devices in ACPI - Add patch to add support for HP Laptops - Add patch to add support for various CS35L41 devices in scan.c and bus-multi-instantiate from previous chain: https://lore.kernel.org/all/20220117160830.709403-1-tanureal@xxxxxxxxxxxxxxxxxxxxx/ Lucas Tanure (5): platform/x86: i2c-multi-instantiate: Move it to drivers/acpi folder ACPI: i2c-multi-instantiate: Rename it for a generic bus driver name ACPI: bus-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 ACPI: bus-multi-instantiate: Add SPI support MAINTAINERS | 4 +- drivers/acpi/Kconfig | 11 + drivers/acpi/Makefile | 1 + drivers/acpi/bus-multi-instantiate.c | 369 +++++++++++++++++++ drivers/acpi/scan.c | 16 +- drivers/platform/x86/Kconfig | 11 - drivers/platform/x86/Makefile | 1 - drivers/platform/x86/i2c-multi-instantiate.c | 174 --------- drivers/spi/spi.c | 142 ++++++- include/linux/spi/spi.h | 32 ++ sound/pci/hda/patch_realtek.c | 43 ++- 11 files changed, 592 insertions(+), 212 deletions(-) create mode 100644 drivers/acpi/bus-multi-instantiate.c delete mode 100644 drivers/platform/x86/i2c-multi-instantiate.c -- 2.25.1
