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authorKarthikeyan Ramasubramanian <kramasub@google.com>2020-09-30 17:04:15 -0600
committerPatrick Georgi <pgeorgi@google.com>2020-10-19 06:57:29 +0000
commitcbc29a2160d93f077098a022de3f8b8971ed85a2 (patch)
tree15fff47c2bef86b1e9bad76454b419d4809fc7d5 /src/drivers/i2c/gpiomux/Kconfig
parenteac283fb0c57398611f73dd9bdee7e0c598d2821 (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/Kconfig6
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.