i.MX Processors中的主题 Re: Need know pullup configuration for i2c0 interface

Need know pullup configuration for i2c0 interface

rajucm — Thu, 05 Mar 2015 10:57:10 GMT

Dear ALL,

we are using imx6qd processor.

We don't have external pull-up voltage on SDA and SCL line.

We need to enable internal pull-up voltage for i2c-0.

How to configure gpio pull-up on i2c-0?...

Thanks,

Raju

igorpadykov — Thu, 05 Mar 2015 13:07:42 GMT

Hi Raju

pull up can be enabled on pad with IOMUXC_SW_PAD_CTL_PADxx Pad Control

Porting Guide Chapter 2 Configuring the IOMUX Controller.

In latest linux with device tree every pin needs to have its PAD configured

in the dts file. For example:

MX6QDL_PAD_GPIO_0__CCM_CLKO1 0x130b0

The explanation of what these values mean is available at:

Documentation/devicetree/bindings/pinctrl/fsl,imx6q-pinctrl.txt

Best regards

igor

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Yuri — Fri, 06 Mar 2015 03:32:07 GMT

Basically there are recommended values for I2C pull up resistors,

please refer to section 7.1 (Pull-up resistor sizing) of the I2C specs.

Regards,

Yuri.

rajucm — Mon, 30 Mar 2015 03:37:01 GMT

Thanks Yuri,

I Check the document and configured accordingly... It worked for me..

Rajucm