lib: fdt: Split fdtdec_setup_memory_banksize()

Split fdtdec_setup_memory_banksize() into fdtdec_setup_memory_banksize_fdt(),
which allows the caller to pass custom blob into the function and the
original fdtdec_setup_memory_banksize(), which uses the gd->fdt_blob. This
is useful when configuring the DRAM properties from a FDT blob fragment
passed in by the firmware.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Cc: Simon Glass <sjg@chromium.org>
Cc: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

2 files changed, 31 insertions, 6 deletions

diff --git a/include/fdtdec.h b/include/fdtdec.h
index 3e681099a8..ad00f79f20 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -956,6 +956,25 @@ int fdtdec_setup_mem_size_base_fdt(const void *blob);
 int fdtdec_setup_mem_size_base(void);
 
 /**
+ * fdtdec_setup_memory_banksize_fdt() - decode and populate gd->bd->bi_dram
+ *
+ * Decode the /memory 'reg' property to determine the address and size of the
+ * memory banks. Use this data to populate the global data board info with the
+ * phys address and size of memory banks.
+ *
+ * This function should be called from a boards dram_init_banksize(). This
+ * helper function allows for boards to query the device tree for memory bank
+ * information instead of hard coding the information in cases where it cannot
+ * be detected automatically.
+ *
+ * @param blob		FDT blob
+ *
+ * @return 0 if OK, -EINVAL if the /memory node or reg property is missing or
+ * invalid
+ */
+int fdtdec_setup_memory_banksize_fdt(const void *blob);
+
+/**
  * fdtdec_setup_memory_banksize() - decode and populate gd->bd->bi_dram
  *
  * Decode the /memory 'reg' property to determine the address and size of the
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 3f29e9d647..79915b59bd 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -1123,33 +1123,33 @@ int fdtdec_setup_mem_size_base(void)
 static int get_next_memory_node(const void *blob, int mem)
 {
 	do {
-		mem = fdt_node_offset_by_prop_value(gd->fdt_blob, mem,
+		mem = fdt_node_offset_by_prop_value(blob, mem,
 						    "device_type", "memory", 7);
 	} while (!fdtdec_get_is_enabled(blob, mem));
 
 	return mem;
 }
 
-int fdtdec_setup_memory_banksize(void)
+int fdtdec_setup_memory_banksize_fdt(const void *blob)
 {
 	int bank, ret, mem, reg = 0;
 	struct fdt_resource res;
 
-	mem = get_next_memory_node(gd->fdt_blob, -1);
+	mem = get_next_memory_node(blob, -1);
 	if (mem < 0) {
 		debug("%s: Missing /memory node\n", __func__);
 		return -EINVAL;
 	}
 
 	for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
-		ret = fdt_get_resource(gd->fdt_blob, mem, "reg", reg++, &res);
+		ret = fdt_get_resource(blob, mem, "reg", reg++, &res);
 		if (ret == -FDT_ERR_NOTFOUND) {
 			reg = 0;
-			mem = get_next_memory_node(gd->fdt_blob, mem);
+			mem = get_next_memory_node(blob, mem);
 			if (mem == -FDT_ERR_NOTFOUND)
 				break;
 
-			ret = fdt_get_resource(gd->fdt_blob, mem, "reg", reg++, &res);
+			ret = fdt_get_resource(blob, mem, "reg", reg++, &res);
 			if (ret == -FDT_ERR_NOTFOUND)
 				break;
 		}
@@ -1169,6 +1169,12 @@ int fdtdec_setup_memory_banksize(void)
 
 	return 0;
 }
+
+int fdtdec_setup_memory_banksize(void)
+{
+	return fdtdec_setup_memory_banksize_fdt(gd->fdt_blob);
+
+}
 #endif
 
 #if CONFIG_IS_ENABLED(MULTI_DTB_FIT)