[coreboot-gerrit] Patch merged into coreboot/master: i2c: Add a generic i2c driver
gerrit at coreboot.org
gerrit at coreboot.org
Thu Jun 2 05:36:55 CEST 2016
the following patch was just integrated into master:
commit 21a097aedc2b5a45bd55e1a6fb61a21f0ff43e07
Author: Duncan Laurie <dlaurie at chromium.org>
Date: Wed May 11 09:50:59 2016 -0700
i2c: Add a generic i2c driver
This adds a generic I2C driver that can be described in the devicetree
and used to generate ACPI objects in the SSDT based on the information
provided in the config registers.
The I2C bus can be configured and the device can provide an interrupt and
wake capability to the OS. A configuration option allows for a GPIO to
be provided that will be checked to determine if the device is preset on
the board before including it in the generated SSDT.
The driver is generic enough to be used for basic I2C devices that do
not have special configuration needs such as touchpads, touchscreens,
sensors, some audio codec/amplifiers, etc.
Sample usage for a touchpad device:
device pci 15.1 on
chip drivers/i2c/generic
register "hid" = ""ELAN0000""
register "desc" = "ELAN Touchpad"
register "irq" = "IRQ_EDGE_LOW(GPP_B3_IRQ)"
register "wake" = "GPE0_DW0_05"
device i2c 15.0 on end
end
end
Will result in the following code in the SSDT:
Scope (\_SB.PCI0.I2C1) {
Device (D015) {
Name (_HID, "ELAN0000")
Name (_UID, 0)
Name (_S0W, 4)
Name (_PRW, Package () { 5, 3 })
Method (_STA) { Return (0x0f) }
Name (_CRS, ResourceTemplate () {
I2cSerialBus (0x15, ControllerInitiated, 400000, AddressingMode7Bit,
"\\_S.PCI0.I2C1", 0, ResourceConsumer)
Interrupt (ResourceConsumer, Edge, ActiveLow) { 51 }
})
}
}
Change-Id: Ib32055720835b70e91ede5e4028ecd91894d70d5
Signed-off-by: Duncan Laurie <dlaurie at chromium.org>
Reviewed-on: https://review.coreboot.org/15016
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin at chromium.org>
See https://review.coreboot.org/15016 for details.
-gerrit
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