original_kernel/Documentation/devicetree/bindings/sound/ssm2518.txt

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SSM2518 audio amplifier
This device supports I2C only.
Required properties:
- compatible : Must be "adi,ssm2518"
- reg : the I2C address of the device. This will either be 0x34 (ADDR pin low)
or 0x35 (ADDR pin high)
Optional properties:
- gpios : GPIO connected to the nSD pin. If the property is not present it is
assumed that the nSD pin is hardwired to always on.
Example:
ssm2518: ssm2518@34 {
compatible = "adi,ssm2518";
reg = <0x34>;
gpios = <&gpio 5 0>;
};