[U-Boot] [PATCH 04/13] regmap: Add API regmap_init_mem_index()

[Faiz Abbas]

In device nodes with more than one entry in the reg property,
it is sometimes useful to regmap only of the entries. Add an
API regmap_init_mem_index() to facilitate this.

Signed-off-by: Faiz Abbas <faiz_abbas at ti.com>
---
 drivers/core/regmap.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 include/regmap.h      |  2 ++
 2 files changed, 44 insertions(+)

diff --git a/drivers/core/regmap.c b/drivers/core/regmap.c
index 5ef0f71c8b..d1d12eef38 100644
--- a/drivers/core/regmap.c
+++ b/drivers/core/regmap.c
@@ -108,6 +108,48 @@ static int init_range(ofnode node, struct regmap_range *range, int addr_len,
 	return 0;
 }
 
+int regmap_init_mem_index(ofnode node, struct regmap **mapp, int index)
+{
+	struct regmap *map;
+	int addr_len, size_len;
+	int ret;
+
+	addr_len = ofnode_read_simple_addr_cells(ofnode_get_parent(node));
+	if (addr_len < 0) {
+		debug("%s: Error while reading the addr length (ret = %d)\n",
+		      ofnode_get_name(node), addr_len);
+		return addr_len;
+	}
+
+	size_len = ofnode_read_simple_size_cells(ofnode_get_parent(node));
+	if (size_len < 0) {
+		debug("%s: Error while reading the size length: (ret = %d)\n",
+		      ofnode_get_name(node), size_len);
+		return size_len;
+	}
+
+	map = regmap_alloc(1);
+	if (!map)
+		return -ENOMEM;
+
+	ret = init_range(node, map->ranges, addr_len, size_len, index);
+	if (ret)
+		return ret;
+
+	if (ofnode_read_bool(node, "little-endian"))
+		map->endianness = REGMAP_LITTLE_ENDIAN;
+	else if (ofnode_read_bool(node, "big-endian"))
+		map->endianness = REGMAP_BIG_ENDIAN;
+	else if (ofnode_read_bool(node, "native-endian"))
+		map->endianness = REGMAP_NATIVE_ENDIAN;
+	else /* Default: native endianness */
+		map->endianness = REGMAP_NATIVE_ENDIAN;
+
+	*mapp = map;
+
+	return ret;
+}
+
 int regmap_init_mem(ofnode node, struct regmap **mapp)
 {
 	struct regmap_range *range;
diff --git a/include/regmap.h b/include/regmap.h
index b2b733fda6..3cd97d3b94 100644
--- a/include/regmap.h
+++ b/include/regmap.h
@@ -280,6 +280,8 @@ int regmap_init_mem(ofnode node, struct regmap **mapp);
 int regmap_init_mem_platdata(struct udevice *dev, fdt_val_t *reg, int count,
 			     struct regmap **mapp);
 
+int regmap_init_mem_index(ofnode node, struct regmap **mapp, int index);
+
 /**
  * regmap_get_range() - Obtain the base memory address of a regmap range
  *
-- 
2.19.2