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Diffstat (limited to 'Documentation/powerpc')
| -rw-r--r-- | Documentation/powerpc/booting-without-of.txt | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/Documentation/powerpc/booting-without-of.txt b/Documentation/powerpc/booting-without-of.txt index b68684d39f9..f6394b50943 100644 --- a/Documentation/powerpc/booting-without-of.txt +++ b/Documentation/powerpc/booting-without-of.txt @@ -2160,6 +2160,48 @@ platforms are moved over to use the flattened-device-tree model. }; }; + x) I2C + + The I2C controller is expressed as a bus under the CPM node. + + Properties: + - compatible : "fsl,cpm1-i2c", "fsl,cpm2-i2c" + - reg : On CPM2 devices, the second resource doesn't specify the I2C + Parameter RAM itself, but the I2C_BASE field of the CPM2 Parameter RAM + (typically 0x8afc 0x2). + - #address-cells : Should be one. The cell is the i2c device address with + the r/w bit set to zero. + - #size-cells : Should be zero. + - clock-frequency : Can be used to set the i2c clock frequency. If + unspecified, a default frequency of 60kHz is being used. + The following two properties are deprecated. They are only used by legacy + i2c drivers to find the bus to probe: + - linux,i2c-index : Can be used to hard code an i2c bus number. By default, + the bus number is dynamically assigned by the i2c core. + - linux,i2c-class : Can be used to override the i2c class. The class is used + by legacy i2c device drivers to find a bus in a specific context like + system management, video or sound. By default, I2C_CLASS_HWMON (1) is + being used. The definition of the classes can be found in + include/i2c/i2c.h + + Example, based on mpc823: + + i2c@860 { + compatible = "fsl,mpc823-i2c", + "fsl,cpm1-i2c"; + reg = <0x860 0x20 0x3c80 0x30>; + interrupts = <16>; + interrupt-parent = <&CPM_PIC>; + fsl,cpm-command = <0x10>; + #address-cells = <1>; + #size-cells = <0>; + + rtc@68 { + compatible = "dallas,ds1307"; + reg = <0x68>; + }; + }; + m) Chipselect/Local Bus Properties: |