[PATCH] ppc32/serial: Change mpc52xx_uart.c to use the Low Density Serial port major

Before this patch we were just using the "classic" /dev/ttySx devices.
However when another on the system is loaded that uses those (like drivers for
serial PCMCIA), that creates a conflict for the minors.  Therefore, we now use
/dev/ttyPSC[0:5] (note the 0-based numbering !) with some minors we've been
assigned in the "Low Density Serial port major"

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 15 insertions, 11 deletions

diff --git a/drivers/serial/mpc52xx_uart.c b/drivers/serial/mpc52xx_uart.c
index 4dcf0310bef5..1288d6203e94 100644
--- a/drivers/serial/mpc52xx_uart.c
+++ b/drivers/serial/mpc52xx_uart.c
@@ -37,11 +37,11 @@
  * by the bootloader or in the platform init code.
  *
  * The idx field must be equal to the PSC index ( e.g. 0 for PSC1, 1 for PSC2,
- * and so on). So the PSC1 is mapped to /dev/ttyS0, PSC2 to /dev/ttyS1 and so
- * on. But be warned, it's an ABSOLUTE REQUIREMENT ! This is needed mainly for
- * the console code : without this 1:1 mapping, at early boot time, when we are
- * parsing the kernel args console=ttyS?, we wouldn't know wich PSC it will be
- * mapped to.
+ * and so on). So the PSC1 is mapped to /dev/ttyPSC0, PSC2 to /dev/ttyPSC1 and
+ * so on. But be warned, it's an ABSOLUTE REQUIREMENT ! This is needed mainly
+ * fpr the console code : without this 1:1 mapping, at early boot time, when we
+ * are parsing the kernel args console=ttyPSC?, we wouldn't know wich PSC it
+ * will be mapped to.
  */
 
 #include <linux/config.h>
@@ -65,6 +65,10 @@
 #include <linux/serial_core.h>
 
 
+/* We've been assigned a range on the "Low-density serial ports" major */
+#define SERIAL_PSC_MAJOR        204
+#define SERIAL_PSC_MINOR        148
+
 
 #define ISR_PASS_LIMIT 256      /* Max number of iteration in the interrupt */
 
@@ -671,12 +675,12 @@ mpc52xx_console_setup(struct console *co, char *options)
 static struct uart_driver mpc52xx_uart_driver;
 
 static struct console mpc52xx_console = {
-        .name   = "ttyS",
+        .name   = "ttyPSC",
         .write  = mpc52xx_console_write,
         .device = uart_console_device,
         .setup  = mpc52xx_console_setup,
         .flags  = CON_PRINTBUFFER,
-        .index  = -1,   /* Specified on the cmdline (e.g. console=ttyS0 ) */
+        .index  = -1,   /* Specified on the cmdline (e.g. console=ttyPSC0 ) */
         .data   = &mpc52xx_uart_driver,
 };
 
@@ -703,10 +707,10 @@ console_initcall(mpc52xx_console_init);
 static struct uart_driver mpc52xx_uart_driver = {
         .owner          = THIS_MODULE,
         .driver_name    = "mpc52xx_psc_uart",
-        .dev_name       = "ttyS",
-        .devfs_name     = "ttyS",
-        .major          = TTY_MAJOR,
-        .minor          = 64,
+        .dev_name       = "ttyPSC",
+        .devfs_name     = "ttyPSC",
+        .major          = SERIAL_PSC_MAJOR,
+        .minor          = SERIAL_PSC_MINOR,
         .nr             = MPC52xx_PSC_MAXNUM,
         .cons           = MPC52xx_PSC_CONSOLE,
 };