mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 04:34:11 +08:00
572c9fa516
This converts the plain text documentation to reStructuredText format and adds it to Sphinx TOC tree. No essential content change. Signed-off-by: Changbin Du <changbin.du@gmail.com> Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
62 lines
1.7 KiB
ReStructuredText
62 lines
1.7 KiB
ReStructuredText
.. 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::
|
|
|
|
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,,)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|