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+The dmascc_cfg utility
+======================
+
+Use this utility to configure the dmascc driver.
+
+Usage:
+------
+
+dmascc_cfg <interface> [ options ... ]
+
+Options:
+--------
+
+--show		Show all configurable parameters for this port.
+		May be specified at any time by any user.
+
+All other options change parameters and thus may only be specified
+  - by root
+  - when the interface is down
+
+--speed <f>	Set frequency of baud rate generator. A value of 0 disables
+		the baud rate generator and the digital PLL. Use the
+		--show option to check whether the frequency you selected
+		could be approximated with sufficient accuracy.
+
+--nrzi 0 | 1	0 selects NRZ mode, 1 selects NRZI mode.
+
+--clocks <i>	Set clock mode. You may OR together three choices (other
+		values are not supported and may cause strange results):
+
+		TX clock pin:		0x00	input
+					0x05	output TX clock *
+					0x06	output baud rate generator *
+					0x07	output digital PLL *
+
+		TX clock source:	0x00	RX clock pin
+					0x08	TX clock pin #
+					0x10	baud rate generator
+					0x18	digital PLL +
+
+		RX clock source:	0x00	RX clock pin
+					0x20	TX clock pin
+					0x40	baud rate generator
+					0x60	digital PLL +
+
+		* Not allowed on PI2 Port A if J3 is installed.
+		# TX clock pin must be configured as input
+		+ Speed must be equal to 32 times the baud rate.
+
+--txdelay <f>	Set transmit delay in ms (0 < f < 2500).
+
+--txtime <f>	Set maximum time in s the transmitter may be active
+		(0 < f).
+
+--sqdelay <f>   Set squelch delay in ms (0 < f < 2500).
+
+--slottime <f>  Set slot time in ms (0 < f < 2500).
+
+--waittime <f>	Set the minimum time in ms between transmitter off and
+		transmitter on (0 < f < 2500).
+
+--persist <i>	Set persistence parameter (0 <= i <= 255).
+
+--dma <i>	Set DMA channel (0, 1, or 3). 0 disables DMA.
+
+<f> ... floating-point argument, <i> ... integer argument.
+Parameters are not checked for validity. The driver or the kernel may crash
+if you specify invalid values.
+