[dgarske]

Description

Exposes the 68INT6 board devices on the LPSS I2C0 and GSPI0 controllers to Linux, the same way NAI's stock BIOS declares them, so NAI's Linux drivers (naigspi, plus at24 for the EEPROMs) bind under wolfBoot.

What it adds

• src/x86/acpi_dsdt.asl, include/x86/acpi_dsdt.h - I2C0 (00:15.0) and SPI0 (00:1e.2) under the PCI root, with:
  • the PRC register controller on GSPI0 CS0 (15AC0001)
  • EEPROM (15AC0002, 0x56) and serial-number EEPROM (15AC0003, 0x5E)
  • RTC/watchdog (15AC0004, 0x68)
• include/x86/gpio_config.h - GSPI0 (GPP_B15-B18) and I2C0 (GPP_C16/C17) pads in native mode, with the stock pad values
• src/x86/tgl_fsp.c - SerialIoI2cMode[0] set to PCI mode on nai_68int6 (it was disabled)
• docs/Targets.md - notes the board devices in the DSDT
  The serial-number EEPROM's read-only property is written as a name/value pair, as ACPI device properties require.

Testing

Builds for nai_68int6 and kontron_vx3060_s2.