imx6 quad setting pad mode

[pedropl]

Hello,

according to reference manual of IMX6 Quad processor if I want to use I2C external signals I have to set appropriate pad modes (table 35-1 page 1888). How can I achieve that? Is editing the device-tree by setting i2c devices to status = "okay" enough?

Any help appreciated.

[igorpadykov]

Hi pedropl

one can look at

Linux/arch/arm/boot/dts/imx6qdl-sabresd.dtsi - Linux Cross Reference - Free Electrons

Linux/arch/arm/boot/dts/imx6q-pinfunc.h - Linux Cross Reference - Free Electrons

and linux /Documentation/devicetree/bindings

Best regards

igor

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[pedropl]

As far as I get it:

pinctrl_i2c1: i2c1grp {

fsl,pins = <

MX6QDL_PAD_CSI0_DAT8__I2C1_SDA 0x4001b8b1

MX6QDL_PAD_CSI0_DAT9__I2C1_SCL 0x4001b8b1

>;

};

pinctrl_i2c2: i2c2grp {

fsl,pins = <

MX6QDL_PAD_KEY_COL3__I2C2_SCL 0x4001b8b1

MX6QDL_PAD_KEY_ROW3__I2C2_SDA 0x4001b8b1

>;

};

pinctrl_i2c3: i2c3grp {

fsl,pins = <

MX6QDL_PAD_GPIO_3__I2C3_SCL 0x4001b8b1

MX6QDL_PAD_GPIO_6__I2C3_SDA 0x4001b8b1

>;

};

Those are enough to configure pads to be set for I2C adapters (set the multiplexers)? How do I know the value after pad name - as on the example "0x4001b8b1"? Is this value somehow connected to values from header file:

#define MX6QDL_PAD_GPIO_6__I2C3_SDA  0x230 0x600 0x8ac 0x2 0x1 ?

Thanks for your help,

Pedro

[igorpadykov · Accepted solution]

one can look at

Definitive GPIO guide - Studio Kousagi Wiki

~igor

[pedropl]

This article is very helpful, seems to answer my questions. With this knowledge one can start manipulating with pads :smileyhappy:

Thank you for your help.