projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| af71100c RH |
1 | * Synopsys DesignWare I2C |
| 2 | ||
| 3 | Required properties : | |
| 4 | ||
| 5 | - compatible : should be "snps,designware-i2c" | |
| 6 | - reg : Offset and length of the register set for the device | |
| 7 | - interrupts : <IRQ> where IRQ is the interrupt number. | |
| 8 | ||
| 9 | Recommended properties : | |
| 10 | ||
| 11 | - clock-frequency : desired I2C bus clock frequency in Hz. | |
| 12 | ||
| 9803f868 CR |
13 | Optional properties : |
| 14 | - i2c-sda-hold-time-ns : should contain the SDA hold time in nanoseconds. | |
| 15 | This option is only supported in hardware blocks version 1.11a or newer. | |
| 16 | ||
| 8e2596e8 | 17 | - i2c-scl-falling-time-ns : should contain the SCL falling time in nanoseconds. |
| 6468276b RB |
18 | This value which is by default 300ns is used to compute the tLOW period. |
| 19 | ||
| 8e2596e8 | 20 | - i2c-sda-falling-time-ns : should contain the SDA falling time in nanoseconds. |
| 6468276b RB |
21 | This value which is by default 300ns is used to compute the tHIGH period. |
| 22 | ||
| af71100c RH |
23 | Example : |
| 24 | ||
| 25 | i2c@f0000 { | |
| 26 | #address-cells = <1>; | |
| 27 | #size-cells = <0>; | |
| 28 | compatible = "snps,designware-i2c"; | |
| 29 | reg = <0xf0000 0x1000>; | |
| 30 | interrupts = <11>; | |
| 31 | clock-frequency = <400000>; | |
| 32 | }; | |
| 9803f868 CR |
33 | |
| 34 | i2c@1120000 { | |
| 35 | #address-cells = <1>; | |
| 36 | #size-cells = <0>; | |
| 37 | compatible = "snps,designware-i2c"; | |
| 38 | reg = <0x1120000 0x1000>; | |
| 39 | interrupt-parent = <&ictl>; | |
| 40 | interrupts = <12 1>; | |
| 41 | clock-frequency = <400000>; | |
| 42 | i2c-sda-hold-time-ns = <300>; | |
| 6468276b RB |
43 | i2c-sda-falling-time-ns = <300>; |
| 44 | i2c-scl-falling-time-ns = <300>; | |
| 9803f868 | 45 | }; |