diff options
Diffstat (limited to 'drivers/base/regmap/regmap.c')
| -rw-r--r-- | drivers/base/regmap/regmap.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index e3fa3896fe..6613670263 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -28,6 +28,50 @@ static LIST_HEAD(regmaps); +enum regmap_endian regmap_get_val_endian(struct device_d *dev, + const struct regmap_bus *bus, + const struct regmap_config *config) +{ + struct device_node *np; + enum regmap_endian endian; + + /* Retrieve the endianness specification from the regmap config */ + endian = config->val_format_endian; + + /* If the regmap config specified a non-default value, use that */ + if (endian != REGMAP_ENDIAN_DEFAULT) + return endian; + + /* If the dev and dev->device_node exist try to get endianness from DT */ + if (dev && dev->device_node) { + np = dev->device_node; + + /* Parse the device's DT node for an endianness specification */ + if (of_property_read_bool(np, "big-endian")) + endian = REGMAP_ENDIAN_BIG; + else if (of_property_read_bool(np, "little-endian")) + endian = REGMAP_ENDIAN_LITTLE; + else if (of_property_read_bool(np, "native-endian")) + endian = REGMAP_ENDIAN_NATIVE; + + /* If the endianness was specified in DT, use that */ + if (endian != REGMAP_ENDIAN_DEFAULT) + return endian; + } + + /* Retrieve the endianness specification from the bus config */ + if (bus && bus->val_format_endian_default) + endian = bus->val_format_endian_default; + + /* If the bus specified a non-default value, use that */ + if (endian != REGMAP_ENDIAN_DEFAULT) + return endian; + + /* Use this if no other value was found */ + return REGMAP_ENDIAN_BIG; +} +EXPORT_SYMBOL_GPL(regmap_get_val_endian); + /* * regmap_init - initialize and register a regmap * |