vsprintf: Add modifier for phys_addr_t

Provide a new modifier to vsprintf() to print phys_addr_t variables to
avoid having to cast or #ifdef when printing them out. The %pa modifier
is used for this purpose, so phys_addr_t variables need to be passed by
reference, like so:

	phys_addr_t start = 0;

	printf("start: %pa\n", &start);

Depending on the size of phys_addr_t this will print out the address
with 8 or 16 hexadecimal digits following a 0x prefix.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Simon Glass <sjg@chromium.org>

lib/vsprintf.c

@@ -515,6 +515,8 @@ static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
 static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 		int field_width, int precision, int flags)
 {
+	u64 num = (uintptr_t)ptr;
+
 	/*
 	 * Being a boot loader, we explicitly allow pointers to
 	 * (physical) address null.
@@ -527,6 +529,17 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 
 #ifdef CONFIG_CMD_NET
 	switch (*fmt) {
+	case 'a':
+		flags |= SPECIAL | ZEROPAD;
+
+		switch (fmt[1]) {
+		case 'p':
+		default:
+			field_width = sizeof(phys_addr_t) * 2 + 2;
+			num = *(phys_addr_t *)ptr;
+			break;
+		}
+		break;
 	case 'm':
 		flags |= SPECIAL;
 		/* Fallthrough */
@@ -552,8 +565,7 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 		field_width = 2*sizeof(void *);
 		flags |= ZEROPAD;
 	}
-	return number(buf, end, (unsigned long)ptr, 16, field_width,
-		      precision, flags);
+	return number(buf, end, num, 16, field_width, precision, flags);
 }
 
 static int vsnprintf_internal(char *buf, size_t size, const char *fmt,