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Commit e60a19f0 authored by Simon Horman's avatar Simon Horman
Browse files

ARM: dts: alt: use demuxer for I2C4 



Make it possible to fallback to GPIO for I2C4 on the EXIO-B connector.

This is based on reference work for the I2C0 core of the lager/r8a7790
by Wolfram Sang.

Signed-off-by: default avatarSimon Horman <horms+renesas@verge.net.au>
[wsa: rebased and fixed aliases]
Signed-off-by: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
parent 6723438b

arch/arm/boot/dts/r8a7794-alt.dts

+35 −0
Original line number Diff line number Diff line
@@ -18,6 +18,8 @@ 


	aliases {

		serial0 = &scif2;

		i2c10 = &gpioi2c4;

		i2c12 = &i2cexio4;

	};



	chosen {
@@ -135,6 +137,29 @@ 
		#clock-cells = <0>;

		clock-frequency = <148500000>;

	};



	gpioi2c4: i2c-10 {

		#address-cells = <1>;

		#size-cells = <0>;

		compatible = "i2c-gpio";

		status = "disabled";

		gpios = <&gpio4 9 GPIO_ACTIVE_HIGH /* sda */

			 &gpio4 8 GPIO_ACTIVE_HIGH /* scl */

			>;

		i2c-gpio,delay-us = <5>;

	};



	/*

	 * I2C4 is routed to EXIO connector B, pins 73 (SCL) + 74 (SDA).

	 * A fallback to GPIO is provided.

	 */

	i2cexio4: i2c-14 {

		compatible = "i2c-demux-pinctrl";

		i2c-parent = <&i2c4>, <&gpioi2c4>;

		i2c-bus-name = "i2c-exio4";

		#address-cells = <1>;

		#size-cells = <0>;

	};

};



&du {
@@ -194,6 +219,11 @@ 
		function = "i2c1";

	};



	i2c4_pins: i2c4 {

		groups = "i2c4";

		function = "i2c4";

	};



	vin0_pins: vin0 {

		groups = "vin0_data8", "vin0_clk";

		function = "vin0";
@@ -314,6 +344,11 @@ 
	};

};



&i2c4 {

	pinctrl-0 = <&i2c4_pins>;

	pinctrl-names = "i2c-exio4";

};



&vin0 {

	status = "okay";

	pinctrl-0 = <&vin0_pins>;