i.MX53 SODIMM I2C

Modifying I2C bus speed

Locating configuration file

The initial CPU configuration is part the following device tree source file:

• arch/arm/boot/dts/imx53.dtsi

Shared module configuration can be found in the following file:

• arch/arm/boot/dts/imx53-vmx53.dtsi

The specific module configuration customised to i.MX53 SODIMM PC Module configurations is part of these device tree source files:

• i.MX53 SODIMM PC Module Max: arch/arm/boot/dts/imx53-vmx53-557.dts
• i.MX53 SODIMM PC Module Pro: arch/arm/boot/dts/imx53-vmx53-668.dts
• i.MX53 SODIMM PC Module Basic: arch/arm/boot/dts/imx53-vmx53-779.dts

Note: In most cases a single file needs to be edited.

I2C bus speed adjustment

I2C speed: 50 kHz

&i2c1 {
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_i2c1_2>;
	clock-frequency = <50000>;
	status = "okay";
}

I2C speed: 100 kHz (Default)

&i2c1 {
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_i2c1_2>;
	status = "okay";
}

I2C speed: 400 kHz

&i2c1 {
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_i2c1_2>;
	clock-frequency = <400000>;
	status = "okay";
}