devicetree: cadence_ttc: Document binding for timer width
Modern TTC implementations can extend the timer width to 32 bit. This feature is not self identifying so the driver needs to be made aware via device tree. Signed-off-by: NPeter Crosthwaite <peter.crosthwaite@xilinx.com> Signed-off-by: NMichal Simek <michal.simek@xilinx.com>
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