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regmap: Allow left shifting register offset before access

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Drivers can configure it to adjust the final read/write location.

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 10:04:13 +05:30 • committed by Tom Rini
parent 78aaedba9f
commit 7aa5ddffe7
2 changed files with 11 additions and 1 deletions
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6
drivers/core/regmap.c
View file

@ -261,8 +261,10 @@ struct regmap *devm_regmap_init(struct udevice *dev,
return ERR_PTR(rc); return ERR_PTR(rc);
map = *mapp; map = *mapp;
if (config) if (config) {
map->width = config->width; map->width = config->width;
map->reg_offset_shift = config->reg_offset_shift;
}
devres_add(dev, mapp); devres_add(dev, mapp);
return *mapp; return *mapp;
@ -349,6 +351,7 @@ int regmap_raw_read_range(struct regmap *map, uint range_num, uint offset,
} }
range = &map->ranges[range_num]; range = &map->ranges[range_num];
offset <<= map->reg_offset_shift;
if (offset + val_len > range->size) { if (offset + val_len > range->size) {
debug("%s: offset/size combination invalid\n", __func__); debug("%s: offset/size combination invalid\n", __func__);
return -ERANGE; return -ERANGE;
@ -458,6 +461,7 @@ int regmap_raw_write_range(struct regmap *map, uint range_num, uint offset,
} }
range = &map->ranges[range_num]; range = &map->ranges[range_num];
offset <<= map->reg_offset_shift;
if (offset + val_len > range->size) { if (offset + val_len > range->size) {
debug("%s: offset/size combination invalid\n", __func__); debug("%s: offset/size combination invalid\n", __func__);
return -ERANGE; return -ERANGE;

6
include/regmap.h
View file

@ -82,9 +82,12 @@ struct regmap_bus;
* *
* @width: Width of the read/write operations. Defaults to * @width: Width of the read/write operations. Defaults to
* REGMAP_SIZE_32 if set to 0. * REGMAP_SIZE_32 if set to 0.
* @reg_offset_shift Left shift the register offset by this value before
* performing read or write.
*/ */
struct regmap_config { struct regmap_config {
enum regmap_size_t width; enum regmap_size_t width;
u32 reg_offset_shift;
}; };
/** /**
@ -92,12 +95,15 @@ struct regmap_config {
* *
* @width: Width of the read/write operations. Defaults to * @width: Width of the read/write operations. Defaults to
* REGMAP_SIZE_32 if set to 0. * REGMAP_SIZE_32 if set to 0.
* @reg_offset_shift Left shift the register offset by this value before
* performing read or write.
* @range_count: Number of ranges available within the map * @range_count: Number of ranges available within the map
* @ranges: Array of ranges * @ranges: Array of ranges
*/ */
struct regmap { struct regmap {
enum regmap_endianness_t endianness; enum regmap_endianness_t endianness;
enum regmap_size_t width; enum regmap_size_t width;
u32 reg_offset_shift;
int range_count; int range_count;
struct regmap_range ranges[0]; struct regmap_range ranges[0];
}; };