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regmap: Add regmap_init_mem_range()

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Right now, the base of a regmap can only be obtained from the device
tree. This makes it impossible for devices which calculate the base at
runtime to use a regmap. An example of such a device is the Cadence
Sierra PHY.

Allow creating a regmap with one range whose start and size can be
specified by the driver based on calculations at runtime.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Pratyush Yadav 2020-09-24 10:04:14 +05:30 • committed by Tom Rini
parent 7aa5ddffe7
commit 0e01a7c3f4
2 changed files with 46 additions and 0 deletions
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27
drivers/core/regmap.c
View file

@ -164,6 +164,33 @@ err:
return ret;
}
int regmap_init_mem_range(ofnode node, ulong r_start, ulong r_size,
struct regmap **mapp)
{
struct regmap *map;
struct regmap_range *range;
map = regmap_alloc(1);
if (!map)
return -ENOMEM;
range = &map->ranges[0];
range->start = r_start;
range->size = r_size;
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 0;
}
int regmap_init_mem(ofnode node, struct regmap **mapp)
{
struct regmap_range *range;

19
include/regmap.h
View file

@ -350,6 +350,25 @@ int regmap_init_mem_platdata(struct udevice *dev, fdt_val_t *reg, int count,
int regmap_init_mem_index(ofnode node, struct regmap **mapp, int index);
/**
* regmap_init_mem_range() - Set up a new memory region for ofnode with the
* specified range.
*
* @node: The ofnode for the map.
* @r_start: Start of the range.
* @r_size: Size of the range.
* @mapp: Returns allocated map.
*
* Return: 0 in success, -errno otherwise
*
* This creates a regmap with one range where instead of extracting the range
* from 'node', it is created based on the parameters specified. This is
* useful when a driver needs to calculate the base of the regmap at runtime,
* and can't specify it in device tree.
*/
int regmap_init_mem_range(ofnode node, ulong r_start, ulong r_size,
struct regmap **mapp);
/**
* devm_regmap_init() - Initialise register map (device managed)
*