Information about clock divider in GPCLK-Overlay
Adds link to BCM2835 ARM Peripherals Document and informs about the error in that document regarding GPCLK. (That info would have saved me a lot of time a few days ago, so i thought it would be great to put it there) Related: raspberrypi/documentation#747
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@ -29,3 +29,4 @@ The following clock sources are available:
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7 216 MHz HDMI auxiliary
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8-15 0 Hz Ground
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```
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Other frequencies can be achieved by setting a clock-divider in the form of `SOURCE/(DIV_I + DIV_F/4096)`. Note, that the [BCM2835 ARM Peripherals](https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2835/BCM2835-ARM-Peripherals.pdf) document contains an error and states that the denominator of the divider is 1024 instead of 4096.
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