ubuntu-linux-kernel/Documentation/devicetree/bindings/clock/armada3700-xtal-clock.txt

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* Xtal Clock bindings for Marvell Armada 37xx SoCs
Marvell Armada 37xx SoCs allow to determine the xtal clock frequencies by
reading the gpio latch register.
This node must be a subnode of the node exposing the register address
of the GPIO block where the gpio latch is located.
See Documentation/devicetree/bindings/pinctrl/marvell,armada-37xx-pinctrl.txt
Required properties:
- compatible : shall be one of the following:
"marvell,armada-3700-xtal-clock"
- #clock-cells : from common clock binding; shall be set to 0
Optional properties:
- clock-output-names : from common clock binding; allows overwrite default clock
output names ("xtal")
Example:
pinctrl_nb: pinctrl-nb@13800 {
compatible = "armada3710-nb-pinctrl", "syscon", "simple-mfd";
reg = <0x13800 0x100>, <0x13C00 0x20>;
xtalclk: xtal-clk {
compatible = "marvell,armada-3700-xtal-clock";
clock-output-names = "xtal";
#clock-cells = <0>;
};
};