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Add i2x_mux_pca9545 overlay to configure mux #1465

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Add i2x_mux_pca9545 overlay to configure mux #1465

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1 change: 1 addition & 0 deletions arch/arm/boot/dts/overlays/Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,7 @@ dtbo-$(RPI_DT_OVERLAYS) += hy28a.dtbo
dtbo-$(RPI_DT_OVERLAYS) += hy28b.dtbo
dtbo-$(RPI_DT_OVERLAYS) += i2c-rtc.dtbo
dtbo-$(RPI_DT_OVERLAYS) += i2c-gpio.dtbo
dtbo-$(RPI_DT_OVERLAYS) += i2c-mux-pca9545a.dtbo
dtbo-$(RPI_DT_OVERLAYS) += i2c-mux-pca9548a.dtbo
dtbo-$(RPI_DT_OVERLAYS) += i2c-pwm-pca9685a.dtbo
dtbo-$(RPI_DT_OVERLAYS) += i2c0-bcm2708.dtbo
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6 changes: 6 additions & 0 deletions arch/arm/boot/dts/overlays/README
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Expand Up @@ -420,6 +420,12 @@ Params: i2c_gpio_sda GPIO used for I2C data (default "23")
i2c_gpio_delay_us Clock delay in microseconds
(default "2" = ~100kHz)


Name: i2c-mux-pca9545a
Info: Adds support for an NXP PCA9545A I2C multiplexer on i2c_arm
Load: dtoverlay=i2c-mux-pca9545a,<param>=<val>
Params: addr I2C address of PCA9545A (default 0x73)


Name: i2c-mux-pca9548a
Info: Adds support for an NXP PCA9548A I2C multiplexer on i2c_arm
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47 changes: 47 additions & 0 deletions arch/arm/boot/dts/overlays/i2c-mux-pca9545a-overlay.dts
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@@ -0,0 +1,47 @@
// Definitions for NXP PCA9545A I2C mux on ARM I2C bus.
/dts-v1/;
/plugin/;

/{
compatible = "brcm,bcm2708";

fragment@0 {
target = <&i2c_arm>;
__overlay__ {
#address-cells = <1>;
#size-cells = <0>;
status = "okay";

i2cmux: mux@73 {
compatible = "nxp,pca9545";
reg = <0x73>;
#address-cells = <1>;
#size-cells = <0>;

i2c@0 {
#address-cells = <1>;
#size-cells = <0>;
reg = <0>;
};
i2c@1 {
#address-cells = <1>;
#size-cells = <0>;
reg = <1>;
};
i2c@2 {
#address-cells = <1>;
#size-cells = <0>;
reg = <2>;
};
i2c@3 {
#address-cells = <1>;
#size-cells = <0>;
reg = <3>;
};
};
};
};
__overrides__ {
addr = <&i2cmux>,"reg:0";
};
};