diff options
| author | Karthikeyan Ramasubramanian <kramasub@google.com> | 2020-09-30 17:04:15 -0600 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2020-10-19 06:57:29 +0000 |
| commit | cbc29a2160d93f077098a022de3f8b8971ed85a2 (patch) | |
| tree | 15fff47c2bef86b1e9bad76454b419d4809fc7d5 /src/drivers/i2c/gpiomux/Kconfig | |
| parent | eac283fb0c57398611f73dd9bdee7e0c598d2821 (diff) | |
drivers/i2c: Add chip driver for GPIO based I2C multiplexer
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>
Diffstat (limited to 'src/drivers/i2c/gpiomux/Kconfig')
| -rw-r--r-- | src/drivers/i2c/gpiomux/Kconfig | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/drivers/i2c/gpiomux/Kconfig b/src/drivers/i2c/gpiomux/Kconfig new file mode 100644 index 0000000000..f09a641eb7 --- /dev/null +++ b/src/drivers/i2c/gpiomux/Kconfig @@ -0,0 +1,6 @@ +config DRIVERS_I2C_GPIO_MUX + bool + default n + depends on HAVE_ACPI_TABLES + help + When enabled, add identifiers in ACPI tables for GPIO based I2C multiplexer. |