imx6 - pincontrol - iomux configuration in device tree

[Ansari]

Hi,

We are using imx6Q sabresd platform for our development with Linux 3.10.17_1.0.0-GA BSP.

In device tree, the UART1 IOMUX configuration is done in "arch/arm/boot/dts/imx6qdl.dtsi" file as mentioned below.

uart1 {

pinctrl_uart1_1: uart1grp-1 {

fsl,pins = <

MX6QDL_PAD_CSI0_DAT10__UART1_TX_DATA 0x1b0b1

MX6QDL_PAD_CSI0_DAT11__UART1_RX_DATA 0x1b0b1

>;

};

};

We would like to know, in which file the IOMUX configuration will be called?

We have gone through the "linux-imx/drivers/tty/serial/imx.c" file. But we couldn't find the below function for IOMUX configuration

"devm_pinctrl_get_select_default"

In addition, the flexcan IOMUX configuration is called  in "drivers/net/can/flexcan.c" file as mentioned below (from the probe function call)

	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
	if (IS_ERR(pinctrl))
	return PTR_ERR(pinctrl);

Please suggest us for better understanding.

Thank You,

Regards,

Ansari

[igorpadykov]

Hi Abdul

I think it may be useful to look at

Linux/Documentation/devicetree/bindings/pinctrl/fsl,imx-pinctrl.txt - Linux Cross Reference - Free E...

Linux/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt - Linux Cross Reference - Free Elect...

~igor

[Ansari]

Hi Igor,

Thanks for your input on our request.

Could you please give your detailed input on below

In which file/function the below uart1 IOMUX configuration (which is defined in the device tree) will be called?

uart1 {

pinctrl_uart1_1: uart1grp-1 {

fsl,pins = <

MX6QDL_PAD_CSI0_DAT10__UART1_TX_DATA 0x1b0b1

MX6QDL_PAD_CSI0_DAT11__UART1_RX_DATA 0x1b0b1

>;

};

};

Thank You,

Regards,

Ansari

[igorpadykov]

I believe it is loaded when pinctrl driver is loaded in

..drivers/pinctrl/pinctrl-imx6q.c

https://lkml.org/lkml/2013/9/28/63

then it scans pads in device tree

http://lkml.iu.edu//hypermail/linux/kernel/1204.3/01488.html

~igor