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regmap: Add API regmap_init_mem_index()

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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@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Faiz Abbas 2019-06-11 00:43:33 +05:30 committed by Tom Rini
parent 6fca7fb3a0
commit 55a1a09b2a
2 changed files with 44 additions and 0 deletions
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42
drivers/core/regmap.c
View file

@ -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;

2
include/regmap.h
View file

@ -330,6 +330,8 @@ 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
*