linux/Documentation/devicetree/bindings/nvec/nvidia,nvec.txt
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   1NVIDIA compliant embedded controller
   2
   3Required properties:
   4- compatible : should be "nvidia,nvec".
   5- reg : the iomem of the i2c slave controller
   6- interrupts : the interrupt line of the i2c slave controller
   7- clock-frequency : the frequency of the i2c bus
   8- gpios : the gpio used for ec request
   9- slave-addr: the i2c address of the slave controller
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