This patch was used to add TAS2781 devices on SPI support in sound/pci/hda.
It use ACPI node descript about parameters of TAS2781 on SPI, it like:
    Scope (_SB.PC00.SPI0)
    {
        Device (GSPK)
        {
            Name (_HID, "TXNW2781")  // _HID: Hardware ID
            Method (_CRS, 0, NotSerialized)
            {
                Name (RBUF, ResourceTemplate ()
                {
                    SpiSerialBusV2 (...)
                    SpiSerialBusV2 (...)
                }
            }
        }
    }

And in platform/x86/serial-multi-instantiate.c, those spi devices will be
added into system as a single SPI device, so TAS2781 SPI driver will
probe twice for every single SPI device. And driver will also parser
mono DSP firmware binary and RCA binary for itself.

Signed-off-by: Baojun Xu <baojun.xu@ti.com>

Baojun Xu (3):
  ALSA: hda/tas2781: Modification for add tas2781 driver for SPI
  ALSA: hda/tas2781: Main code of tas2781 driver for SPI
  ALSA: hda/tas2781: Firmware load for tas2781 driver for SPI

 drivers/acpi/scan.c                           |    1 +
 .../platform/x86/serial-multi-instantiate.c   |   10 +
 sound/pci/hda/Kconfig                         |   15 +
 sound/pci/hda/Makefile                        |    2 +
 sound/pci/hda/patch_realtek.c                 |   13 +
 sound/pci/hda/tas2781-spi.h                   |  165 ++
 sound/pci/hda/tas2781_hda_spi.c               | 1305 ++++++++++
 sound/pci/hda/tas2781_spi_fwlib.c             | 2272 +++++++++++++++++
 8 files changed, 3783 insertions(+)
 create mode 100644 sound/pci/hda/tas2781-spi.h
 create mode 100644 sound/pci/hda/tas2781_hda_spi.c
 create mode 100644 sound/pci/hda/tas2781_spi_fwlib.c

-- 
2.40.1