[U-Boot] [PATCH 1/4] lib: fdt: Split fdtdec_setup_mem_size_base()

[Marek Vasut]

Split fdtdec_setup_mem_size_base() into fdtdec_setup_mem_size_base_fdt(),
which allows the caller to pass custom blob into the function and the
original fdtdec_setup_mem_size_base(), 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 at gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu at nigauri.org>
Cc: Simon Glass <sjg at chromium.org>
Cc: Tom Rini <trini at konsulko.com>
---
 include/fdtdec.h | 20 ++++++++++++++++++++
 lib/fdtdec.c     | 11 ++++++++---
 2 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/include/fdtdec.h b/include/fdtdec.h
index b7e35cd87c..3e681099a8 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -917,6 +917,26 @@ struct display_timing {
 int fdtdec_decode_display_timing(const void *blob, int node, int index,
 				 struct display_timing *config);
 
+/**
+ * fdtdec_setup_mem_size_base_fdt() - decode and setup gd->ram_size and
+ * gd->ram_start
+ *
+ * Decode the /memory 'reg' property to determine the size and start of the
+ * first memory bank, populate the global data with the size and start of the
+ * first bank of memory.
+ *
+ * This function should be called from a boards dram_init(). This helper
+ * function allows for boards to query the device tree for DRAM size and start
+ * address instead of hard coding the value in the case where the memory size
+ * and start address 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_mem_size_base_fdt(const void *blob);
+
 /**
  * fdtdec_setup_mem_size_base() - decode and setup gd->ram_size and
  * gd->ram_start
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 09a7e133a5..3f29e9d647 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -1088,18 +1088,18 @@ int fdtdec_decode_display_timing(const void *blob, int parent, int index,
 	return ret;
 }
 
-int fdtdec_setup_mem_size_base(void)
+int fdtdec_setup_mem_size_base_fdt(const void *blob)
 {
 	int ret, mem;
 	struct fdt_resource res;
 
-	mem = fdt_path_offset(gd->fdt_blob, "/memory");
+	mem = fdt_path_offset(blob, "/memory");
 	if (mem < 0) {
 		debug("%s: Missing /memory node\n", __func__);
 		return -EINVAL;
 	}
 
-	ret = fdt_get_resource(gd->fdt_blob, mem, "reg", 0, &res);
+	ret = fdt_get_resource(blob, mem, "reg", 0, &res);
 	if (ret != 0) {
 		debug("%s: Unable to decode first memory bank\n", __func__);
 		return -EINVAL;
@@ -1113,6 +1113,11 @@ int fdtdec_setup_mem_size_base(void)
 	return 0;
 }
 
+int fdtdec_setup_mem_size_base(void)
+{
+	return fdtdec_setup_mem_size_base_fdt(gd->fdt_blob);
+}
+
 #if defined(CONFIG_NR_DRAM_BANKS)
 
 static int get_next_memory_node(const void *blob, int mem)
-- 
2.19.2