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ARM: dts: bcm2711-rpi: Add pinctrl-based multiplexing for I2C0

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BCM2711-based Raspberry Pi boards (4B, CM4 and 400) multiplex the I2C0
controller over two sets of pins, GPIO0+1 and GPIO44+45. The former is
exposed on the 40-pin header, while the latter is used for the CSI and
DSI connectors.

Add a pinctrl-based I2C bus multiplexer to bcm2711-rpi.dtsi to model
this multiplexing. The two child buses are named i2c0_0 and i2c0_1.

Note that if you modified the dts before to add devices to the i2c bus
appearing on pins gpio0 + gpio1 (either directly in the dts or using an
overlay), you have to put these into the i2c0_0 node introduced here
now.

Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Link: https://lore.kernel.org/r/20240402000424.4650-8-laurent.pinchart@ideasonboard.com
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
This commit is contained in:
Uwe Kleine-König 2024-04-02 03:04:14 +03:00 committed by Florian Fainelli
parent f702475b83
commit 84b1d6cc3e
1 changed files with 29 additions and 0 deletions
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29
arch/arm/boot/dts/broadcom/bcm2711-rpi.dtsi
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@ -17,6 +17,30 @@ aliases {
pcie0 = &pcie0; pcie0 = &pcie0;
blconfig = &blconfig; blconfig = &blconfig;
}; };
i2c0mux: i2c-mux0 {
compatible = "i2c-mux-pinctrl";
#address-cells = <1>;
#size-cells = <0>;
i2c-parent = <&i2c0>;
pinctrl-names = "i2c0", "i2c0-vc";
pinctrl-0 = <&i2c0_gpio0>;
pinctrl-1 = <&i2c0_gpio44>;
i2c0_0: i2c@0 {
reg = <0>;
#address-cells = <1>;
#size-cells = <0>;
};
i2c0_1: i2c@1 {
reg = <1>;
#address-cells = <1>;
#size-cells = <0>;
};
};
}; };
&firmware { &firmware {
@ -49,6 +73,11 @@ &hvs {
clocks = <&firmware_clocks 4>; clocks = <&firmware_clocks 4>;
}; };
&i2c0 {
/delete-property/ pinctrl-names;
/delete-property/ pinctrl-0;
};
&rmem { &rmem {
/* /*
* RPi4's co-processor will copy the board's bootloader configuration * RPi4's co-processor will copy the board's bootloader configuration