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This chip driver adds ACPI identifiers for multiplexed I2C bus that are
selected using GPIO. The multiplexed bus device defines the address
to select the I2C lines. These ACPI identifiers are consumed by the
i2c-mux-gpio kernel driver:
https://www.kernel.org/doc/html/latest/i2c/muxes/i2c-mux-gpio.html
BUG=b:169444894
TEST=Build and boot to OS in waddledee. Ensure that the ACPI identifiers
are added in appropriate context.
Scope (\_SB.PCI0.I2C3.MUX0)
{
Device (MXA0)
{
Method (_STA, 0, NotSerialized) // _STA: Status
{
Return (0x0F)
}
Name (_ADR, Zero) // _ADR: Address
}
}
Scope (\_SB.PCI0.I2C3.MUX0)
{
Device (MXA1)
{
Method (_STA, 0, NotSerialized) // _STA: Status
{
Return (0x0F)
}
Name (_ADR, One) // _ADR: Address
}
}
Change-Id: If8b983bc8ce212ce05fe6b7f01a6d9092468e582
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46144
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
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Add identifiers in ACPI tables for GPIO based I2C multiplexer. The
multiplexer device defines the GPIO resource used to select the
adapter/bus lines. The multiplexer adapter device defines the address
to select the adapter/client lines. These ACPI identifiers are consumed
by the i2c-mux-gpio kernel driver:
https://www.kernel.org/doc/html/latest/i2c/muxes/i2c-mux-gpio.html
BUG=b:169444894
TEST=Build and boot waddledee to OS. Ensure that the ACPI identifiers
are added for I2C devices multiplexed using I2C MUX under the
appropriate scope. Here is the output SSDT:
Scope (\_SB.PCI0.I2C3)
{
Device (MUX0)
{
Name (_HID, "PRP0001") // _HID: Hardware ID
Method (_STA, 0, NotSerialized) // _STA: Status
{
Return (0x0F)
}
Name (_CRS, ResourceTemplate () // _CRS: Current Resource Settings
{
GpioIo (Exclusive, PullDefault, 0x0000, 0x0000, IoRestrictionOutputOnly,
"\\_SB.PCI0.GPIO", 0x00, ResourceConsumer, ,
)
{ // Pin list
0x0125
}
})
Name (_DSD, Package (0x02) // _DSD: Device-Specific Data
{
ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301") /* Device Properties for _DSD */,
Package (0x02)
{
Package (0x02)
{
"compatible",
"i2c-mux-gpio"
},
Package (0x02)
{
"mux-gpios",
Package (0x04)
{
\_SB.PCI0.I2C3.MUX0,
Zero,
Zero,
Zero
}
}
}
})
}
}
Change-Id: Ib371108cc6043c133681066bf7bf4b2e00771e8b
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45911
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
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