1NVIDIA compliant embedded controller
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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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