The AMD ASF (Alert Standard Format) function block is essentially an SMBus controller with built-in ASF functionality. It features two pins SCL1 and SDA1 that facilitate communication with other SMBus devices. This dual capability allows the ASF controller to issue generic SMBus packets and communicate with the DASH controller using MCTP over ASF. Additionally, the ASF controller supports remote commands defined by the ASF specification, such as shutdown, reset, power-up, and power-down, without requiring any software interaction. The concept is to enable a remote system to communicate with the target system over the network. The local network controller, such as an Ethernet MAC, receives remote packets and relays the commands to the FCH (Fusion Controller Hub) through the ASF. Examples of these commands include shutdown and reset. Since ASF uses the SMBus protocol, this controller can be configured as a secondary SMBus controller. This series of updates is focused on integrating the capabilities of AMD's ASF (Alert Standard Format) controller into the i2c-piix4 driver. v3: ---- - Fix LKP reported issue by adding 'depends on X86' - Drop callback when using acpi_dev_get_resources() - Address other remarks from Andy on v2. v2: ---- - Change function signature from u8 to enum - Use default case in switch - Use acpi_dev_get_resources() and drop devm_kzalloc() usage - Fix LKP reported issues - Address other minor remarks from Andy and Andi Shyti Shyam Sundar S K (5): i2c: piix4: Allow more than two algo selection for SMBus i2c: piix4: Add i2c_algorithm operations to support AMD ASF with SMBus i2c: piix4: Add ACPI support for ASF SMBus device i2c: piix4: Adjust the SMBus debug message i2c: piix4: Clear remote IRR bit to get successive interrupt drivers/i2c/busses/Kconfig | 3 +- drivers/i2c/busses/i2c-piix4.c | 396 ++++++++++++++++++++++++++++++++- 2 files changed, 389 insertions(+), 10 deletions(-) -- 2.25.1
