tty: Blackin CTS/RTS

Both software emulated and hardware based CTS and RTS are enabled in
serial driver.

The CTS RTS PIN connection on BF548 UART port is defined as a modem
device not as a host device.  In order to test it under Linux, please
nake a cross UART cable to exchange CTS and RTS signal.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 20 insertions, 6 deletions

diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index d89972beb12..f2e5736ad0c 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -734,7 +734,7 @@ config BFIN_UART0_CTSRTS
 
 config UART0_CTS_PIN
         int "UART0 CTS pin"
-        depends on BFIN_UART0_CTSRTS
+        depends on BFIN_UART0_CTSRTS && !BF548
         default 23
         help
           The default pin is GPIO_GP7.
@@ -742,7 +742,7 @@ config UART0_CTS_PIN
 
 config UART0_RTS_PIN
         int "UART0 RTS pin"
-        depends on BFIN_UART0_CTSRTS
+        depends on BFIN_UART0_CTSRTS && !BF548
         default 22
         help
           The default pin is GPIO_GP6.
@@ -763,14 +763,14 @@ config BFIN_UART1_CTSRTS
 
 config UART1_CTS_PIN
         int "UART1 CTS pin"
-        depends on BFIN_UART1_CTSRTS && !BF54x
+        depends on BFIN_UART1_CTSRTS && !BF548
         default -1
         help
           Refer to ./include/asm-blackfin/gpio.h to see the GPIO map.
 
 config UART1_RTS_PIN
         int "UART1 RTS pin"
-        depends on BFIN_UART1_CTSRTS && !BF54x
+        depends on BFIN_UART1_CTSRTS && !BF548
         default -1
         help
           Refer to ./include/asm-blackfin/gpio.h to see the GPIO map.
@@ -790,14 +790,14 @@ config BFIN_UART2_CTSRTS
 
 config UART2_CTS_PIN
         int "UART2 CTS pin"
-        depends on BFIN_UART2_CTSRTS
+        depends on BFIN_UART2_CTSRTS && !BF548
         default -1
         help
           Refer to ./include/asm-blackfin/gpio.h to see the GPIO map.
 
 config UART2_RTS_PIN
         int "UART2 RTS pin"
-        depends on BFIN_UART2_CTSRTS
+        depends on BFIN_UART2_CTSRTS && !BF548
         default -1
         help
           Refer to ./include/asm-blackfin/gpio.h to see the GPIO map.
@@ -815,6 +815,20 @@ config BFIN_UART3_CTSRTS
           Enable hardware flow control in the driver. Using GPIO emulate the CTS/RTS
           signal.
 
+config UART3_CTS_PIN
+        int "UART3 CTS pin"
+        depends on BFIN_UART3_CTSRTS && !BF548
+        default -1
+        help
+          Refer to ./include/asm-blackfin/gpio.h to see the GPIO map.
+
+config UART3_RTS_PIN
+        int "UART3 RTS pin"
+        depends on BFIN_UART3_CTSRTS && !BF548
+        default -1
+        help
+          Refer to ./include/asm-blackfin/gpio.h to see the GPIO map.
+
 config SERIAL_IMX
         bool "IMX serial port support"
         depends on ARM && (ARCH_IMX || ARCH_MXC)