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# External 32.768 kHz output

You can configure pad MCA_IO6 to output a 32.768 kHz signal for clocking external peripherals.

## Kernel configuration

The 32.768 kHz output functionality is part of the MCA core driver and does not require any special kernel option.

## Platform driver mapping

The MCA core driver is located at:

File | Description
--- | ---
drivers/mfd/mca-cc6ul-core.c | ConnectCore 6UL MCA core driver

## Device tree bindings and customization

The 32.768 kHz functionality does not require any device tree property.

## Using the 32.768 kHz output

The functionality is controlled by a sysfs entry. To enable the 32.768 kHz signal on MCA_IO6 pad:

    ~# echo enabled > /sys/bus/i2c/drivers/mca_cc6ul/0-007e/ext32_khz

To disable it:

    ~# echo disabled > /sys/bus/i2c/drivers/mca_cc6ul/0-007e/ext32_khz

To read the current status of the pad:

    ~# cat /sys/bus/i2c/drivers/mca_cc6ul/0-007e/ext32_khz
    disabled

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External 32.768 kHz output updated on 22 January 2018 02:43:37 PM