[POWERPC] bootwrapper: serial_console_init() fixes

1. Search the entire compatible list for serial devices.

The serial code previously did a simple strcmp on the compatible
node; this fails when the match string is not the first compatible
listed.  Use dt_is_compatible() instead.

2. Don't call serial_edit_cmdline if getc isn't defined.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 5 insertions, 7 deletions

diff --git a/arch/powerpc/boot/serial.c b/arch/powerpc/boot/serial.c
index eaa0d3ae351..3ce7f651ab3 100644
--- a/arch/powerpc/boot/serial.c
+++ b/arch/powerpc/boot/serial.c
@@ -114,18 +114,14 @@ int serial_console_init(void)
 {
         void *devp;
         int rc = -1;
-        char compat[MAX_PROP_LEN];
 
         devp = serial_get_stdout_devp();
         if (devp == NULL)
                 goto err_out;
 
-        if (getprop(devp, "compatible", compat, sizeof(compat)) < 0)
-                goto err_out;
-
-        if (!strcmp(compat, "ns16550"))
+        if (dt_is_compatible(devp, "ns16550"))
                 rc = ns16550_console_init(devp, &serial_cd);
-        else if (!strcmp(compat, "marvell,mpsc"))
+        else if (dt_is_compatible(devp, "marvell,mpsc"))
                 rc = mpsc_console_init(devp, &serial_cd);
 
         /* Add other serial console driver calls here */
@@ -133,10 +129,12 @@ int serial_console_init(void)
         if (!rc) {
                 console_ops.open = serial_open;
                 console_ops.write = serial_write;
-                console_ops.edit_cmdline = serial_edit_cmdline;
                 console_ops.close = serial_close;
                 console_ops.data = &serial_cd;
 
+                if (serial_cd.getc)
+                        console_ops.edit_cmdline = serial_edit_cmdline;
+
                 return 0;
         }
 err_out: