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author | Sascha Hauer <s.hauer@pengutronix.de> | 2015-02-09 08:45:25 +0100 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2015-02-11 09:50:08 +0100 |
commit | ab001302c8e1718110bb8839c270d2caa817b214 (patch) | |
tree | f5ab4feb5242e548917c3536b8510080df9a4e8f /dts/Bindings/i2c/i2c-opal.txt | |
parent | c937ef5d34ede89ae382cfe6d98ba366859a65af (diff) | |
download | barebox-ab001302c8e1718110bb8839c270d2caa817b214.tar.gz barebox-ab001302c8e1718110bb8839c270d2caa817b214.tar.xz |
dts: update to v3.19-rc1
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'dts/Bindings/i2c/i2c-opal.txt')
-rw-r--r-- | dts/Bindings/i2c/i2c-opal.txt | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/dts/Bindings/i2c/i2c-opal.txt b/dts/Bindings/i2c/i2c-opal.txt new file mode 100644 index 0000000000..12bc61465e --- /dev/null +++ b/dts/Bindings/i2c/i2c-opal.txt @@ -0,0 +1,37 @@ +Device-tree bindings for I2C OPAL driver +---------------------------------------- + +Most of the device node and properties layout is specific to the firmware and +used by the firmware itself for configuring the port. From the linux +perspective, the properties of use are "ibm,port-name" and "ibm,opal-id". + +Required properties: + +- reg: Port-id within a given master +- compatible: must be "ibm,opal-i2c" +- ibm,opal-id: Refers to a specific bus and used to identify it when calling + the relevant OPAL functions. +- bus-frequency: Operating frequency of the i2c bus (in HZ). Informational for + linux, used by the FW though. + +Optional properties: +- ibm,port-name: Firmware provides this name that uniquely identifies the i2c + port. + +The node contains a number of other properties that are used by the FW itself +and depend on the specific hardware implementation. The example below depicts +a P8 on-chip bus. + +Example: + +i2c-bus@0 { + reg = <0x0>; + bus-frequency = <0x61a80>; + compatible = "ibm,power8-i2c-port", "ibm,opal-i2c"; + ibm,opal-id = <0x1>; + ibm,port-name = "p8_00000000_e1p0"; + #address-cells = <0x1>; + phandle = <0x10000006>; + #size-cells = <0x0>; + linux,phandle = <0x10000006>; +}; |