of/flattree: Refactor unflatten_dt_node

unflatten_dt_node is a helper function that does most of the work to
convert a device tree blob into tree of device nodes.  This code
now uses a passed-in blob instead of using the single boot-time blob,
allowing it to be called in more contexts.

Signed-off-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 16 insertions, 11 deletions

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 10eab21076ea..cf74e546faf2 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -206,7 +206,7 @@ int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
         return of_fdt_is_compatible(initial_boot_params, node, compat);
 }
 
-static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size,
+static void *unflatten_dt_alloc(unsigned long *mem, unsigned long size,
                                        unsigned long align)
 {
         void *res;
@@ -220,16 +220,18 @@ static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size,
 
 /**
  * unflatten_dt_node - Alloc and populate a device_node from the flat tree
+ * @blob: The parent device tree blob
  * @p: pointer to node in flat tree
  * @dad: Parent struct device_node
  * @allnextpp: pointer to ->allnext from last allocated device_node
  * @fpsize: Size of the node path up at the current depth.
  */
-unsigned long __init unflatten_dt_node(unsigned long mem,
-                                        unsigned long *p,
-                                        struct device_node *dad,
-                                        struct device_node ***allnextpp,
-                                        unsigned long fpsize)
+unsigned long unflatten_dt_node(struct boot_param_header *blob,
+                                unsigned long mem,
+                                unsigned long *p,
+                                struct device_node *dad,
+                                struct device_node ***allnextpp,
+                                unsigned long fpsize)
 {
         struct device_node *np;
         struct property *pp, **prev_pp = NULL;
@@ -325,10 +327,10 @@ unsigned long __init unflatten_dt_node(unsigned long mem,
                 sz = be32_to_cpup((__be32 *)(*p));
                 noff = be32_to_cpup((__be32 *)((*p) + 4));
                 *p += 8;
-                if (be32_to_cpu(initial_boot_params->version) < 0x10)
+                if (be32_to_cpu(blob->version) < 0x10)
                         *p = ALIGN(*p, sz >= 8 ? 8 : 4);
 
-                pname = of_fdt_get_string(initial_boot_params, noff);
+                pname = of_fdt_get_string(blob, noff);
                 if (pname == NULL) {
                         pr_info("Can't find property name in list !\n");
                         break;
@@ -407,7 +409,8 @@ unsigned long __init unflatten_dt_node(unsigned long mem,
                 if (tag == OF_DT_NOP)
                         *p += 4;
                 else
-                        mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize);
+                        mem = unflatten_dt_node(blob, mem, p, np, allnextpp,
+                                                fpsize);
                 tag = be32_to_cpup((__be32 *)(*p));
         }
         if (tag != OF_DT_END_NODE) {
@@ -599,7 +602,8 @@ void __init unflatten_device_tree(void)
         /* First pass, scan for size */
         start = ((unsigned long)initial_boot_params) +
                 be32_to_cpu(initial_boot_params->off_dt_struct);
-        size = unflatten_dt_node(0, &start, NULL, NULL, 0);
+        size = unflatten_dt_node(initial_boot_params, 0, &start,
+                                 NULL, NULL, 0);
         size = (size | 3) + 1;
 
         pr_debug("  size is %lx, allocating...\n", size);
@@ -616,7 +620,8 @@ void __init unflatten_device_tree(void)
         /* Second pass, do actual unflattening */
         start = ((unsigned long)initial_boot_params) +
                 be32_to_cpu(initial_boot_params->off_dt_struct);
-        unflatten_dt_node(mem, &start, NULL, &allnextp, 0);
+        unflatten_dt_node(initial_boot_params, mem, &start,
+                          NULL, &allnextp, 0);
         if (be32_to_cpup((__be32 *)start) != OF_DT_END)
                 pr_warning("Weird tag at end of tree: %08x\n", *((u32 *)start));
         if (be32_to_cpu(((__be32 *)mem)[size / 4]) != 0xdeadbeef)