mirror of https://gitee.com/openkylin/linux.git
63 lines
1.8 KiB
Plaintext
63 lines
1.8 KiB
Plaintext
* I2C
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Required properties :
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- reg : Offset and length of the register set for the device
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- compatible : should be "fsl,CHIP-i2c" where CHIP is the name of a
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compatible processor, e.g. mpc8313, mpc8543, mpc8544, mpc5121,
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mpc5200 or mpc5200b. For the mpc5121, an additional node
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"fsl,mpc5121-i2c-ctrl" is required as shown in the example below.
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Recommended properties :
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- interrupts : <a b> where a is the interrupt number and b is a
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field that represents an encoding of the sense and level
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information for the interrupt. This should be encoded based on
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the information in section 2) depending on the type of interrupt
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controller you have.
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- interrupt-parent : the phandle for the interrupt controller that
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services interrupts for this device.
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- fsl,preserve-clocking : boolean; if defined, the clock settings
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from the bootloader are preserved (not touched).
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- clock-frequency : desired I2C bus clock frequency in Hz.
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Examples :
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/* MPC5121 based board */
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i2c@1740 {
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#address-cells = <1>;
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#size-cells = <0>;
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compatible = "fsl,mpc5121-i2c", "fsl-i2c";
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reg = <0x1740 0x20>;
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interrupts = <11 0x8>;
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interrupt-parent = <&ipic>;
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clock-frequency = <100000>;
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};
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i2ccontrol@1760 {
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compatible = "fsl,mpc5121-i2c-ctrl";
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reg = <0x1760 0x8>;
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};
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/* MPC5200B based board */
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i2c@3d00 {
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#address-cells = <1>;
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#size-cells = <0>;
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compatible = "fsl,mpc5200b-i2c","fsl,mpc5200-i2c","fsl-i2c";
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reg = <0x3d00 0x40>;
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interrupts = <2 15 0>;
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interrupt-parent = <&mpc5200_pic>;
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fsl,preserve-clocking;
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};
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/* MPC8544 base board */
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i2c@3100 {
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#address-cells = <1>;
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#size-cells = <0>;
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compatible = "fsl,mpc8544-i2c", "fsl-i2c";
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reg = <0x3100 0x100>;
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interrupts = <43 2>;
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interrupt-parent = <&mpic>;
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clock-frequency = <400000>;
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};
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