42 lines
1.4 KiB
Plaintext
42 lines
1.4 KiB
Plaintext
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* I2C
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The I2C controller is expressed as a bus under the CPM node.
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Properties:
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- compatible : "fsl,cpm1-i2c", "fsl,cpm2-i2c"
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- reg : On CPM2 devices, the second resource doesn't specify the I2C
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Parameter RAM itself, but the I2C_BASE field of the CPM2 Parameter RAM
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(typically 0x8afc 0x2).
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- #address-cells : Should be one. The cell is the i2c device address with
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the r/w bit set to zero.
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- #size-cells : Should be zero.
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- clock-frequency : Can be used to set the i2c clock frequency. If
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unspecified, a default frequency of 60kHz is being used.
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The following two properties are deprecated. They are only used by legacy
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i2c drivers to find the bus to probe:
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- linux,i2c-index : Can be used to hard code an i2c bus number. By default,
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the bus number is dynamically assigned by the i2c core.
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- linux,i2c-class : Can be used to override the i2c class. The class is used
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by legacy i2c device drivers to find a bus in a specific context like
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system management, video or sound. By default, I2C_CLASS_HWMON (1) is
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being used. The definition of the classes can be found in
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include/i2c/i2c.h
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Example, based on mpc823:
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i2c@860 {
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compatible = "fsl,mpc823-i2c",
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"fsl,cpm1-i2c";
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reg = <0x860 0x20 0x3c80 0x30>;
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interrupts = <16>;
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interrupt-parent = <&CPM_PIC>;
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fsl,cpm-command = <0x10>;
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#address-cells = <1>;
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#size-cells = <0>;
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rtc@68 {
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compatible = "dallas,ds1307";
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reg = <0x68>;
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};
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};
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