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| ACPI I2C Muxes
| --------------
|
| Describing an I2C device hierarchy that includes I2C muxes requires an ACPI
| Device () scope per mux channel.
|
| Consider this topology:
|
| +------+ +------+
| | SMB1 |-->| MUX0 |--CH00--> i2c client A (0x50)
| | | | 0x70 |--CH01--> i2c client B (0x50)
| +------+ +------+
|
| which corresponds to the following ASL:
|
| Device (SMB1)
| {
| Name (_HID, ...)
| Device (MUX0)
| {
| Name (_HID, ...)
| Name (_CRS, ResourceTemplate () {
| I2cSerialBus (0x70, ControllerInitiated, I2C_SPEED,
| AddressingMode7Bit, "^SMB1", 0x00,
| ResourceConsumer,,)
| }
|
| Device (CH00)
| {
| Name (_ADR, 0)
|
| Device (CLIA)
| {
| Name (_HID, ...)
| Name (_CRS, ResourceTemplate () {
| I2cSerialBus (0x50, ControllerInitiated, I2C_SPEED,
| AddressingMode7Bit, "^CH00", 0x00,
| ResourceConsumer,,)
| }
| }
| }
|
| Device (CH01)
| {
| Name (_ADR, 1)
|
| Device (CLIB)
| {
| Name (_HID, ...)
| Name (_CRS, ResourceTemplate () {
| I2cSerialBus (0x50, ControllerInitiated, I2C_SPEED,
| AddressingMode7Bit, "^CH01", 0x00,
| ResourceConsumer,,)
| }
| }
| }
| }
| }
|
|
