[POWERPC] bootwrapper: Add dt_xlate_reg(), and use it to find serial registers.

dt_xlate_reg() uses the ranges properties of a node's parentage to find
the absolute physical address of the node's registers.

The ns16550 driver uses this when no virtual-reg property is found.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 7 insertions, 2 deletions

diff --git a/arch/powerpc/boot/ns16550.c b/arch/powerpc/boot/ns16550.c
index 1ffe72e35cdc..f8f1b2f31412 100644
--- a/arch/powerpc/boot/ns16550.c
+++ b/arch/powerpc/boot/ns16550.c
@@ -55,10 +55,15 @@ static u8 ns16550_tstc(void)
 int ns16550_console_init(void *devp, struct serial_console_data *scdp)
 {
         int n;
+        unsigned long reg_phys;
 
         n = getprop(devp, "virtual-reg", &reg_base, sizeof(reg_base));
-        if (n != sizeof(reg_base))
-                return -1;
+        if (n != sizeof(reg_base)) {
+                if (!dt_xlate_reg(devp, 0, &reg_phys, NULL))
+                        return -1;
+
+                reg_base = (void *)reg_phys;
+        }
 
         n = getprop(devp, "reg-shift", &reg_shift, sizeof(reg_shift));
         if (n != sizeof(reg_shift))