AM67A: How to enable and use I2C4 in the main domain in AM67A.

Wikum Jayasanka

Part Number: AM67A

Tool/software:

I am using Beagly AI board based on AM67A. In that board, only Main domain I2C available from the 40-pin header is I2C4.

1. Is there someone who have used it for I2C communication?

2. Is it possible to use it for I2C communication? if so how to enable it and use it?

4 months ago

0 Jared McArthur 4 months ago

TI__Mastermind 18830 points

Hi Wikum,

You will need to enable i2c4 in the device tree or through a device tree overlay.

Below is an example (although it should be correct).

#include "k3-pinctrl.h"

/dts-v1/;
/plugin/;

/dts-v1/;
/plugin/;

&cbass_main {
    main_i2c4: i2c@fe80000 {
        compatible = "ti,am64-i2c", "ti,omap4-i2c";
        reg = <0x00 0x0fe80000 0x00 0x100>;
        interrupts = <&main_gpio_intr 178 IRQ_TYPE_LEVEL_HIGH>;
        #address-cells = <1>;
        #size-cells = <0>;
        clocks = <&k3_clks 257 2>;
        clock-names = "fck";
        power-domains = <&k3_pds 257 TI_SCI_PD_EXCLUSIVE>;
    };
};

&main_pmx {
    main_i2c4_pins_default: main-i2c4-default-pins {
		pinctrl-single,pins = <
			J722S_IOPAD(0x00a8, PIN_INPUT_PULLUP, 1) /* (R27) GPMC0_CSn0.I2C4_SCL */
			J722S_IOPAD(0x00ac, PIN_INPUT_PULLUP, 1) /* (P21) GPMC0_CSn1.I2C4_SDA */
		>;
	};
};

&main_i2c4 {
	symlink = "hat/main_i2c4";
	pinctrl-names = "default";
	pinctrl-0 = <&main_i2c4_pins_default>;
	clock-frequency = <100000>;
	bootph-all;
	status = "okay";
};

Best,
Jared