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0ac8eb6452
Handle i2c gates similarly to how i2c arbitrators are handled.
This gets rid of a pointless 'reg' property for i2c gates.
I.e. this new and more compact style
some-gate {
i2c-gate {
#address-cells = <1>;
#size-cells = <0>;
some-i2c-device@50 {
reg = <0x50>;
};
};
};
instead of the old
some-gate {
#address-cells = <1>;
#size-cells = <0>;
i2c@0 {
reg = <0>;
#address-cells = <1>;
#size-cells = <0>;
some-i2c-device@50 {
reg = <0x50>;
};
};
};
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Peter Rosin <peda@axentia.se>
42 lines
972 B
Plaintext
42 lines
972 B
Plaintext
An i2c gate is useful to e.g. reduce the digital noise for RF tuners connected
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to the i2c bus. Gates are similar to arbitrators in that you need to perform
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some kind of operation to access the i2c bus past the arbitrator/gate, but
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there are no competing masters to consider for gates and therefore there is
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no arbitration happening for gates.
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Common i2c gate properties.
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- i2c-gate child node
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Required properties for the i2c-gate child node:
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- #address-cells = <1>;
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- #size-cells = <0>;
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Optional properties for i2c-gate child node:
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- Child nodes conforming to i2c bus binding
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Example :
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/*
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An Invensense mpu9150 at address 0x68 featuring an on-chip Asahi
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Kasei ak8975 compass behind a gate.
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*/
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mpu9150@68 {
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compatible = "invensense,mpu9150";
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reg = <0x68>;
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interrupt-parent = <&gpio1>;
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interrupts = <18 1>;
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i2c-gate {
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#address-cells = <1>;
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#size-cells = <0>;
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ax8975@c {
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compatible = "ak,ak8975";
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reg = <0x0c>;
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};
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};
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};
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