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- An i2c gate is useful to e.g. reduce the digital noise for RF tuners connected
- to the i2c bus. Gates are similar to arbitrators in that you need to perform
- some kind of operation to access the i2c bus past the arbitrator/gate, but
- there are no competing masters to consider for gates and therefore there is
- no arbitration happening for gates.
- Common i2c gate properties.
- - i2c-gate child node
- Required properties for the i2c-gate child node:
- - #address-cells = <1>;
- - #size-cells = <0>;
- Optional properties for i2c-gate child node:
- - Child nodes conforming to i2c bus binding
- Example :
- /*
- An Invensense mpu9150 at address 0x68 featuring an on-chip Asahi
- Kasei ak8975 compass behind a gate.
- */
- mpu9150@68 {
- compatible = "invensense,mpu9150";
- reg = <0x68>;
- interrupt-parent = <&gpio1>;
- interrupts = <18 1>;
- i2c-gate {
- #address-cells = <1>;
- #size-cells = <0>;
- ax8975@c {
- compatible = "ak,ak8975";
- reg = <0x0c>;
- };
- };
- };
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