40 lines
1014 B
Plaintext
40 lines
1014 B
Plaintext
I2C bus that tunnels through the ChromeOS EC (cros-ec)
|
|
======================================================
|
|
On some ChromeOS board designs we've got a connection to the EC (embedded
|
|
controller) but no direct connection to some devices on the other side of
|
|
the EC (like a battery and PMIC). To get access to those devices we need
|
|
to tunnel our i2c commands through the EC.
|
|
|
|
The node for this device should be under a cros-ec node like google,cros-ec-spi
|
|
or google,cros-ec-i2c.
|
|
|
|
|
|
Required properties:
|
|
- compatible: google,cros-ec-i2c-tunnel
|
|
- google,remote-bus: The EC bus we'd like to talk to.
|
|
|
|
Optional child nodes:
|
|
- One node per I2C device connected to the tunnelled I2C bus.
|
|
|
|
|
|
Example:
|
|
cros-ec@0 {
|
|
compatible = "google,cros-ec-spi";
|
|
|
|
...
|
|
|
|
i2c-tunnel {
|
|
compatible = "google,cros-ec-i2c-tunnel";
|
|
#address-cells = <1>;
|
|
#size-cells = <0>;
|
|
|
|
google,remote-bus = <0>;
|
|
|
|
battery: sbs-battery@b {
|
|
compatible = "sbs,sbs-battery";
|
|
reg = <0xb>;
|
|
sbs,poll-retry-count = <1>;
|
|
};
|
|
};
|
|
}
|