Based on kernel version 6.18. Page generated on 2025-12-02 09:03 EST.
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.. SPDX-License-Identifier: GPL-2.0
==============
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 (in the scope of \_SB)::
Device (SMB1)
{
Name (_HID, ...)
Device (MUX0)
{
Name (_HID, ...)
Name (_CRS, ResourceTemplate () {
I2cSerialBus (0x70, ControllerInitiated, I2C_SPEED,
AddressingMode7Bit, "\\_SB.SMB1", 0x00,
ResourceConsumer,,)
}
Device (CH00)
{
Name (_ADR, 0)
Device (CLIA)
{
Name (_HID, ...)
Name (_CRS, ResourceTemplate () {
I2cSerialBus (0x50, ControllerInitiated, I2C_SPEED,
AddressingMode7Bit, "\\_SB.SMB1.MUX0.CH00",
0x00, ResourceConsumer,,)
}
}
}
Device (CH01)
{
Name (_ADR, 1)
Device (CLIB)
{
Name (_HID, ...)
Name (_CRS, ResourceTemplate () {
I2cSerialBus (0x50, ControllerInitiated, I2C_SPEED,
AddressingMode7Bit, "\\_SB.SMB1.MUX0.CH01",
0x00, ResourceConsumer,,)
}
}
}
}
}
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