kinetis/pinmux: Do not redefine PIN_UART2_RTS

When a developer working on BSP wants UART1 with RTS, the following
needs to be added in the BSP's include/board.h file:

	#define PIN_UART1_RTS PIN_UART1_RTS_1

which says that PIN_UART1_RTS_1 -- the first alternative pin with UART1
RTS function -- should be used for the UART1's RTS.

There are no alternative pins for PIN_UART2_RTS, therefore a similar
definition is not used for PIN_UART2_RTS.

However, that is a complication when we want PIN_UART2_RTS to be defined
as GPIO, for example:

	#define PIN_UART2_RTS (GPIO_OUTPUT | PIN_PORTB | PIN2)

In such a case, PIN_UART2_RTS is later redefined to the only alternative
function from hardware/kinetis_???pinmux.h file.

This patch avoids the redefinition of already defined names.

We considered renaming PIN_UART2_RTS to PIN_UART2_RTS_1 in the
hardware/kinetis_???pinmux.h file, but that is breaking change. We try
to avoid breaking change.

Signed-off-by: Jiri Vlasak <jvlasak@elektroline.cz>

Author: ghnotgood

arch/arm/src/kinetis/hardware/kinetis_k40pinmux.h

@@ -351,7 +351,9 @@
 
 #define PIN_LCD_P40              (PIN_ANALOG | PIN_PORTD | PIN0)
 #define PIN_SPI0_PCS0_3          (PIN_ALT2   | PIN_PORTD | PIN0)
-#define PIN_UART2_RTS            (PIN_ALT3   | PIN_PORTD | PIN0)
+#if !defined(PIN_UART2_RTS)
+#  define PIN_UART2_RTS          (PIN_ALT3   | PIN_PORTD | PIN0)
+#endif
 #define PIN_LCD_P40F             (PIN_ALT7   | PIN_PORTD | PIN0)
 #define PIN_LCD_P41              (PIN_ANALOG | PIN_PORTD | PIN1)
 #define PIN_ADC0_SE5B            (PIN_ANALOG | PIN_PORTD | PIN1)

arch/arm/src/kinetis/hardware/kinetis_k60pinmux.h

@@ -346,7 +346,9 @@
 #define PIN_FB_TA                (PIN_ALT6   | PIN_PORTC | PIN19)
 
 #define PIN_SPI0_PCS0_3          (PIN_ALT2   | PIN_PORTD | PIN0)
-#define PIN_UART2_RTS            (PIN_ALT3   | PIN_PORTD | PIN0)
+#if !defined(PIN_UART2_RTS)
+#  define PIN_UART2_RTS          (PIN_ALT3   | PIN_PORTD | PIN0)
+#endif
 #define PIN_FTM3_CH0_2           (PIN_ALT4   | PIN_PORTD | PIN0)
 #define PIN_FB_ALE               (PIN_ALT5   | PIN_PORTD | PIN0)
 #define PIN_FB_CS1               (PIN_ALT5   | PIN_PORTD | PIN0)

arch/arm/src/kinetis/hardware/kinetis_k64pinmux.h

@@ -563,7 +563,9 @@
 #define PIN_UART1_TX_2            (PIN_ALT3   | PIN_PORTE | PIN0)
 
 #define PIN_UART2_CTS             (PIN_ALT3   | PIN_PORTD | PIN1)
-#define PIN_UART2_RTS             (PIN_ALT3   | PIN_PORTD | PIN0)
+#if !defined(PIN_UART2_RTS)
+#  define PIN_UART2_RTS           (PIN_ALT3   | PIN_PORTD | PIN0)
+#endif
 #define PIN_UART2_RX              (PIN_ALT3   | PIN_PORTD | PIN2)
 #define PIN_UART2_TX              (PIN_ALT3   | PIN_PORTD | PIN3)
 

arch/arm/src/kinetis/hardware/kinetis_k66pinmux.h

@@ -678,7 +678,9 @@
 #define PIN_UART1_TX_2            (PIN_ALT3   | PIN_PORTE | PIN0)
 
 #define PIN_UART2_CTS             (PIN_ALT3   | PIN_PORTD | PIN1)
-#define PIN_UART2_RTS             (PIN_ALT3   | PIN_PORTD | PIN0)
+#if !defined(PIN_UART2_RTS)
+#  define PIN_UART2_RTS           (PIN_ALT3   | PIN_PORTD | PIN0)
+#endif
 #define PIN_UART2_RX              (PIN_ALT3   | PIN_PORTD | PIN2)
 #define PIN_UART2_TX              (PIN_ALT3   | PIN_PORTD | PIN3)