User`s guide

Configuring the IOMUX Controller (IOMUXC)

i.MX53 System Development User’s Guide, Rev. 1

Freescale Semiconductor 13-5

The variables are as follows:

• 0x620—PAD Control Offset

• 0x2A0—MUX Control Offset

• 4—MUX Mode

• 0x888—Select Input Offset

• 3—Select Input

• MX53_UART_PAD_CTRL—Pad Control

For all addresses and register values, check the IOMUX chapter in the i.MX53 Applications Processor

Reference Manual.

13.3.2 Machine Layer File

The mx53_<reference board name>.c file contains structures for configuring the pads. They are declared

as follows:

static struct pad_desc mx53common_pads[] = {

…

MX53_PAD_ATA_BUFFER_EN__UART2_RXD,

MX53_PAD_ATA_DMARQ__UART2_TXD,

MX53_PAD_ATA_DIOR__UART2_RTS,

MX53_PAD_ATA_INTRQ__UART2_CTS,

MX53_PAD_ATA_CS_0__UART3_TXD,

MX53_PAD_ATA_CS_1__UART3_RXD,

…

};

Add the pad's definitions from iomux-mx53.h to the above code.

On init function (in this example “mx53_<reference board name>_io_init” function), set up the pads using

the following function:

mxc_iomux_v3_setup_multiple_pads(mx53common_pads, ARRAY_SIZE(mx53common_pads));

13.3.3 Example—Setting a GPIO

For an example, configure the pin PATA_DA_1 (PIN L3) as a general GPIO and toggle its signal.

On Kernel menuconfig, add sysfs interface support for GPIO with the following code:

Device Drivers --->

[*] GPIO Support --->

[*] /sys/class/gpio/... (sysfs interface)