serial: pch_uart: Make port type explicit

It used to be a gap in port definitions after PORT_MAX_8250. Since the
new drivers are coming the gap become shorter and shorter until the
commit a2d6a98 ("serial: 8250: Add new port type for TI DA8xx/66AK2x")
completely removed it.

So, while type here is just a formality, make things a little bit more
explicit for this driver and move port types to UAPI header. Note,
it uses two types for now.

Fixes: fddceb8 ("tty: 8250: Add 64byte UART support for FSL platforms")
Cc: Priyanka Jain <Priyanka.Jain@freescale.com>
Cc: Poonam Aggrwal <poonam.aggrwal@freescale.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/pch_uart.c

@@ -46,11 +46,6 @@ enum {
 	PCH_UART_HANDLED_LS_INT_SHIFT,
 };
 
-enum {
-	PCH_UART_8LINE,
-	PCH_UART_2LINE,
-};
-
 #define PCH_UART_DRIVER_DEVICE "ttyPCH"
 
 /* Set the max number of UART port
@@ -267,7 +262,7 @@ struct eg20t_port {
 
 /**
  * struct pch_uart_driver_data - private data structure for UART-DMA
- * @port_type:			The number of DMA channel
+ * @port_type:			The type of UART port
  * @line_no:			UART port line number (0, 1, 2...)
  */
 struct pch_uart_driver_data {
@@ -290,17 +285,17 @@ enum pch_uart_num_t {
 };
 
 static struct pch_uart_driver_data drv_dat[] = {
-	[pch_et20t_uart0] = {PCH_UART_8LINE, 0},
-	[pch_et20t_uart1] = {PCH_UART_2LINE, 1},
-	[pch_et20t_uart2] = {PCH_UART_2LINE, 2},
-	[pch_et20t_uart3] = {PCH_UART_2LINE, 3},
-	[pch_ml7213_uart0] = {PCH_UART_8LINE, 0},
-	[pch_ml7213_uart1] = {PCH_UART_2LINE, 1},
-	[pch_ml7213_uart2] = {PCH_UART_2LINE, 2},
-	[pch_ml7223_uart0] = {PCH_UART_8LINE, 0},
-	[pch_ml7223_uart1] = {PCH_UART_2LINE, 1},
-	[pch_ml7831_uart0] = {PCH_UART_8LINE, 0},
-	[pch_ml7831_uart1] = {PCH_UART_2LINE, 1},
+	[pch_et20t_uart0] = {PORT_PCH_8LINE, 0},
+	[pch_et20t_uart1] = {PORT_PCH_2LINE, 1},
+	[pch_et20t_uart2] = {PORT_PCH_2LINE, 2},
+	[pch_et20t_uart3] = {PORT_PCH_2LINE, 3},
+	[pch_ml7213_uart0] = {PORT_PCH_8LINE, 0},
+	[pch_ml7213_uart1] = {PORT_PCH_2LINE, 1},
+	[pch_ml7213_uart2] = {PORT_PCH_2LINE, 2},
+	[pch_ml7223_uart0] = {PORT_PCH_8LINE, 0},
+	[pch_ml7223_uart1] = {PORT_PCH_2LINE, 1},
+	[pch_ml7831_uart0] = {PORT_PCH_8LINE, 0},
+	[pch_ml7831_uart1] = {PORT_PCH_2LINE, 1},
 };
 
 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
@@ -1777,10 +1772,10 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
 		goto init_port_free_txbuf;
 
 	switch (port_type) {
-	case PORT_UNKNOWN:
+	case PORT_PCH_8LINE:
 		fifosize = 256; /* EG20T/ML7213: UART0 */
 		break;
-	case PORT_8250:
+	case PORT_PCH_2LINE:
 		fifosize = 64; /* EG20T:UART1~3  ML7213: UART1~2*/
 		break;
 	default:
@@ -1804,7 +1799,7 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
 
 	priv->fifo_size = fifosize;
 	priv->uartclk = pch_uart_get_uartclk();
-	priv->port_type = PORT_MAX_8250 + port_type + 1;
+	priv->port_type = port_type;
 	priv->port.dev = &pdev->dev;
 	priv->port.iobase = iobase;
 	priv->port.membase = NULL;

include/uapi/linux/serial_core.h

@@ -57,7 +57,6 @@
 #define PORT_RT2880	29	/* Ralink RT2880 internal UART */
 #define PORT_16550A_FSL64 30	/* Freescale 16550 UART with 64 FIFOs */
 #define PORT_DA830	31	/* TI DA8xx/66AK2x */
-#define PORT_MAX_8250	31	/* max port ID */
 
 /*
  * ARM specific type numbers.  These are not currently guaranteed
@@ -77,6 +76,10 @@
 #define PORT_SUNZILOG	38
 #define PORT_SUNSAB	39
 
+/* Intel EG20 */
+#define PORT_PCH_8LINE	44
+#define PORT_PCH_2LINE	45
+
 /* DEC */
 #define PORT_DZ		46
 #define PORT_ZS		47