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Diffstat (limited to 'Documentation/devicetree/bindings/clock/ti,cdce925.txt')
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diff --git a/Documentation/devicetree/bindings/clock/ti,cdce925.txt b/Documentation/devicetree/bindings/clock/ti,cdce925.txt new file mode 100644 index 000000000..df42ab727 --- /dev/null +++ b/Documentation/devicetree/bindings/clock/ti,cdce925.txt @@ -0,0 +1,53 @@ +Binding for TI CDCE913/925/937/949 programmable I2C clock synthesizers. + +Reference +This binding uses the common clock binding[1]. + +[1] Documentation/devicetree/bindings/clock/clock-bindings.txt +[2] https://www.ti.com/product/cdce913 +[3] https://www.ti.com/product/cdce925 +[4] https://www.ti.com/product/cdce937 +[5] https://www.ti.com/product/cdce949 + +The driver provides clock sources for each output Y1 through Y5. + +Required properties: + - compatible: Shall be one of the following: + - "ti,cdce913": 1-PLL, 3 Outputs + - "ti,cdce925": 2-PLL, 5 Outputs + - "ti,cdce937": 3-PLL, 7 Outputs + - "ti,cdce949": 4-PLL, 9 Outputs + - reg: I2C device address. + - clocks: Points to a fixed parent clock that provides the input frequency. + - #clock-cells: From common clock bindings: Shall be 1. + +Optional properties: + - xtal-load-pf: Crystal load-capacitor value to fine-tune performance on a + board, or to compensate for external influences. +- vdd-supply: A regulator node for Vdd +- vddout-supply: A regulator node for Vddout + +For all PLL1, PLL2, ... an optional child node can be used to specify spread +spectrum clocking parameters for a board. + - spread-spectrum: SSC mode as defined in the data sheet. + - spread-spectrum-center: Use "centered" mode instead of "max" mode. When + present, the clock runs at the requested frequency on average. Otherwise + the requested frequency is the maximum value of the SCC range. + + +Example: + + clockgen: cdce925pw@64 { + compatible = "cdce925"; + reg = <0x64>; + clocks = <&xtal_27Mhz>; + #clock-cells = <1>; + xtal-load-pf = <5>; + vdd-supply = <&1v8-reg>; + vddout-supply = <&3v3-reg>; + /* PLL options to get SSC 1% centered */ + PLL2 { + spread-spectrum = <4>; + spread-spectrum-center; + }; + }; |