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Diffstat (limited to 'kernel/Documentation/devicetree/bindings/i2c/i2c-designware.txt')
| -rw-r--r-- | kernel/Documentation/devicetree/bindings/i2c/i2c-designware.txt | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/kernel/Documentation/devicetree/bindings/i2c/i2c-designware.txt b/kernel/Documentation/devicetree/bindings/i2c/i2c-designware.txt new file mode 100644 index 000000000..fee26dc3e --- /dev/null +++ b/kernel/Documentation/devicetree/bindings/i2c/i2c-designware.txt @@ -0,0 +1,45 @@ +* Synopsys DesignWare I2C + +Required properties : + + - compatible : should be "snps,designware-i2c" + - reg : Offset and length of the register set for the device + - interrupts : <IRQ> where IRQ is the interrupt number. + +Recommended properties : + + - clock-frequency : desired I2C bus clock frequency in Hz. + +Optional properties : + - i2c-sda-hold-time-ns : should contain the SDA hold time in nanoseconds. + This option is only supported in hardware blocks version 1.11a or newer. + + - i2c-scl-falling-time-ns : should contain the SCL falling time in nanoseconds. + This value which is by default 300ns is used to compute the tLOW period. + + - i2c-sda-falling-time-ns : should contain the SDA falling time in nanoseconds. + This value which is by default 300ns is used to compute the tHIGH period. + +Example : + + i2c@f0000 { + #address-cells = <1>; + #size-cells = <0>; + compatible = "snps,designware-i2c"; + reg = <0xf0000 0x1000>; + interrupts = <11>; + clock-frequency = <400000>; + }; + + i2c@1120000 { + #address-cells = <1>; + #size-cells = <0>; + compatible = "snps,designware-i2c"; + reg = <0x1120000 0x1000>; + interrupt-parent = <&ictl>; + interrupts = <12 1>; + clock-frequency = <400000>; + i2c-sda-hold-time-ns = <300>; + i2c-sda-falling-time-ns = <300>; + i2c-scl-falling-time-ns = <300>; + }; |