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Diffstat (limited to 'Documentation/devicetree/bindings/i2c/i2c-st.txt')
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diff --git a/Documentation/devicetree/bindings/i2c/i2c-st.txt b/Documentation/devicetree/bindings/i2c/i2c-st.txt new file mode 100644 index 000000000000..437e0db3823c --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/i2c-st.txt | |||
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1 | ST SSC binding, for I2C mode operation | ||
2 | |||
3 | Required properties : | ||
4 | - compatible : Must be "st,comms-ssc-i2c" or "st,comms-ssc4-i2c" | ||
5 | - reg : Offset and length of the register set for the device | ||
6 | - interrupts : the interrupt specifier | ||
7 | - clock-names: Must contain "ssc". | ||
8 | - clocks: Must contain an entry for each name in clock-names. See the common | ||
9 | clock bindings. | ||
10 | - A pinctrl state named "default" must be defined to set pins in mode of | ||
11 | operation for I2C transfer. | ||
12 | |||
13 | Optional properties : | ||
14 | - clock-frequency : Desired I2C bus clock frequency in Hz. If not specified, | ||
15 | the default 100 kHz frequency will be used. As only Normal and Fast modes | ||
16 | are supported, possible values are 100000 and 400000. | ||
17 | - st,i2c-min-scl-pulse-width-us : The minimum valid SCL pulse width that is | ||
18 | allowed through the deglitch circuit. In units of us. | ||
19 | - st,i2c-min-sda-pulse-width-us : The minimum valid SDA pulse width that is | ||
20 | allowed through the deglitch circuit. In units of us. | ||
21 | - A pinctrl state named "idle" could be defined to set pins in idle state | ||
22 | when I2C instance is not performing a transfer. | ||
23 | - A pinctrl state named "sleep" could be defined to set pins in sleep state | ||
24 | when driver enters in suspend. | ||
25 | |||
26 | |||
27 | |||
28 | Example : | ||
29 | |||
30 | i2c0: i2c@fed40000 { | ||
31 | compatible = "st,comms-ssc4-i2c"; | ||
32 | reg = <0xfed40000 0x110>; | ||
33 | interrupts = <GIC_SPI 187 IRQ_TYPE_LEVEL_HIGH>; | ||
34 | clocks = <&CLK_S_ICN_REG_0>; | ||
35 | clock-names = "ssc"; | ||
36 | clock-frequency = <400000>; | ||
37 | pinctrl-names = "default"; | ||
38 | pinctrl-0 = <&pinctrl_i2c0_default>; | ||
39 | st,i2c-min-scl-pulse-width-us = <0>; | ||
40 | st,i2c-min-sda-pulse-width-us = <5>; | ||
41 | }; | ||