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| author | Pratyush Yadav <p.yadav@ti.com> | 2020-09-24 10:04:14 +0530 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2020-09-30 11:55:22 -0400 |
| commit | 0e01a7c3f4b6a42f768a19f7fc1df92d3e3b5d37 (patch) | |
| tree | 1b7a060901775e87954bfcc9c3dff11b4de041c3 | |
| parent | 7aa5ddffe7fbafe7ef828088ba1dbc76270300c5 (diff) | |
| download | u-boot-0e01a7c3f4b6a42f768a19f7fc1df92d3e3b5d37.tar.gz u-boot-0e01a7c3f4b6a42f768a19f7fc1df92d3e3b5d37.tar.xz u-boot-0e01a7c3f4b6a42f768a19f7fc1df92d3e3b5d37.zip | |
regmap: Add regmap_init_mem_range()
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>
| -rw-r--r-- | drivers/core/regmap.c | 27 | ||||
| -rw-r--r-- | include/regmap.h | 19 |
2 files changed, 46 insertions, 0 deletions
diff --git a/drivers/core/regmap.c b/drivers/core/regmap.c index 173ae80890..a9087df32b 100644 --- a/drivers/core/regmap.c +++ b/drivers/core/regmap.c @@ -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; diff --git a/include/regmap.h b/include/regmap.h index e6c59dfbce..7c8ad04759 100644 --- a/include/regmap.h +++ b/include/regmap.h @@ -351,6 +351,25 @@ 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) * * @dev: Device that will be interacted with |