Commit 84b1d6cc authored by Uwe Kleine-König's avatar Uwe Kleine-König Committed by Florian Fainelli
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ARM: dts: bcm2711-rpi: Add pinctrl-based multiplexing for I2C0 



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: default avatarUwe Kleine-König <uwe@kleine-koenig.org>
Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: default avatarDave Stevenson <dave.stevenson@raspberrypi.com>
Link: https://lore.kernel.org/r/20240402000424.4650-8-laurent.pinchart@ideasonboard.com


Signed-off-by: default avatarFlorian Fainelli <florian.fainelli@broadcom.com>
parent f702475b

arch/arm/boot/dts/broadcom/bcm2711-rpi.dtsi

+29 −0
Original line number Diff line number Diff line
@@ -17,6 +17,30 @@ aliases { 
		pcie0 = &pcie0;

		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 {
@@ -49,6 +73,11 @@ &hvs { 
	clocks = <&firmware_clocks 4>;

};



&i2c0 {

	/delete-property/ pinctrl-names;

	/delete-property/ pinctrl-0;

};



&rmem {

	/*

	 * RPi4's co-processor will copy the board's bootloader configuration