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authorKarthikeyan Ramasubramanian <kramasub@google.com>2020-10-07 12:42:44 -0600
committerPatrick Georgi <pgeorgi@google.com>2020-10-19 06:57:52 +0000
commitbf089d2a6286eae4e25b7cb51e92633ae39252d4 (patch)
treeed5f1cf60b5fcdace8731cd819023e9ac9c17e82 /util/kconfig
parentcbc29a2160d93f077098a022de3f8b8971ed85a2 (diff)
drivers/i2c/gpiomux: Add chip driver for multiplexed I2C bus
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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