docs/library/machine.UART: Remove conditional docs for wipy port.

The UART.init() method is now included unconditionally and its wording
adjusted to better describe ports other than the cc3200.

UART.irq() is also included unconditionally, but this is currently only
available on the WiPy target.

docs/library/machine.UART.rst

@@ -43,21 +43,27 @@ Constructors
 Methods
 -------
 
-.. only:: port_wipy
-
-    .. method:: UART.init(baudrate=9600, bits=8, parity=None, stop=1, \*, pins=(TX, RX, RTS, CTS))
-    
-       Initialise the UART bus with the given parameters:
-    
-         - ``baudrate`` is the clock rate.
-         - ``bits`` is the number of bits per character, 7, 8 or 9.
-         - ``parity`` is the parity, ``None``, 0 (even) or 1 (odd).
-         - ``stop`` is the number of stop bits, 1 or 2.
-         - ``pins`` is a 4 or 2 item list indicating the TX, RX, RTS and CTS pins (in that order).
-           Any of the pins can be None if one wants the UART to operate with limited functionality.
-           If the RTS pin is given the the RX pin must be given as well. The same applies to CTS. 
-           When no pins are given, then the default set of TX and RX pins is taken, and hardware 
-           flow control will be disabled. If pins=None, no pin assignment will be made.
+.. method:: UART.init(baudrate=9600, bits=8, parity=None, stop=1, \*, ...)
+
+   Initialise the UART bus with the given parameters:
+
+     - *baudrate* is the clock rate.
+     - *bits* is the number of bits per character, 7, 8 or 9.
+     - *parity* is the parity, ``None``, 0 (even) or 1 (odd).
+     - *stop* is the number of stop bits, 1 or 2.
+
+   Additional keyword-only parameters that may be supported by a port are:
+
+     - *tx* specifies the TX pin to use.
+     - *rx* specifies the RX pin to use.
+
+   On the WiPy only the following keyword-only parameter is supported:
+
+     - *pins* is a 4 or 2 item list indicating the TX, RX, RTS and CTS pins (in that order).
+       Any of the pins can be None if one wants the UART to operate with limited functionality.
+       If the RTS pin is given the the RX pin must be given as well. The same applies to CTS.
+       When no pins are given, then the default set of TX and RX pins is taken, and hardware
+       flow control will be disabled. If *pins* is ``None``, no pin assignment will be made.
 
 .. method:: UART.deinit()
 
@@ -109,34 +115,36 @@ Methods
    Send a break condition on the bus. This drives the bus low for a duration
    longer than required for a normal transmission of a character.
 
-.. only:: port_wipy
+.. method:: UART.irq(trigger, priority=1, handler=None, wake=machine.IDLE)
+
+   Create a callback to be triggered when data is received on the UART.
 
-    .. method:: UART.irq(trigger, priority=1, handler=None, wake=machine.IDLE)
+       - *trigger* can only be ``UART.RX_ANY``
+       - *priority* level of the interrupt. Can take values in the range 1-7.
+         Higher values represent higher priorities.
+       - *handler* an optional function to be called when new characters arrive.
+       - *wake* can only be ``machine.IDLE``.
 
-       Create a callback to be triggered when data is received on the UART.
+   .. note::
 
-           - ``trigger`` can only be ``UART.RX_ANY``
-           - ``priority`` level of the interrupt. Can take values in the range 1-7.
-             Higher values represent higher priorities.
-           - ``handler`` an optional function to be called when new characters arrive.
-           - ``wake`` can only be ``machine.IDLE``.
+      The handler will be called whenever any of the following two conditions are met:
 
-       .. note::
+          - 8 new characters have been received.
+          - At least 1 new character is waiting in the Rx buffer and the Rx line has been
+            silent for the duration of 1 complete frame.
 
-          The handler will be called whenever any of the following two conditions are met:
+      This means that when the handler function is called there will be between 1 to 8
+      characters waiting.
 
-              - 8 new characters have been received.
-              - At least 1 new character is waiting in the Rx buffer and the Rx line has been
-                silent for the duration of 1 complete frame.
+   Returns an irq object.
 
-          This means that when the handler function is called there will be between 1 to 8 
-          characters waiting.
+   Availability: WiPy.
 
-       Returns an irq object.
+Constants
+---------
 
-    Constants
-    ---------
+.. data:: UART.RX_ANY
 
-    .. data:: UART.RX_ANY
+    IRQ trigger sources
 
-        IRQ trigger sources
+    Availability: WiPy.