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regmap: Split regmap_get_endian() in two functions 

Split regmap_get_endian() in two functions, regmap_get_reg_endian() and
regmap_get_val_endian().

This allows to:
  - Get rid of the three switch()es on "type", incl. error handling in
    three "default" cases,
  - Get rid of the regmap_endian_type enum,
  - Get rid of the non-NULL check of "config" (regmap_init() already
    checks for that),
  - Get rid of the "endian" output parameters, and just return the
    regmap_endian enum value, as the functions can no longer fail.

This saves 21 lines of code (despite the still-present
one-comment-per-line over-documentation), and 30 bytes of code on ARM
V7.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Geert Uytterhoeven 2014-08-27 16:36:03 +02:00 committed by Mark Brown
parent 45e1a279ce
commit cf673fbc63
1 changed files with 48 additions and 69 deletions
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117
drivers/base/regmap/regmap.c
View File

@ -449,78 +449,64 @@ int regmap_attach_dev(struct device *dev, struct regmap *map,
}
EXPORT_SYMBOL_GPL(regmap_attach_dev);
enum regmap_endian_type {
REGMAP_ENDIAN_REG,
REGMAP_ENDIAN_VAL,
};
static int regmap_get_endian(struct device *dev,
const struct regmap_bus *bus,
const struct regmap_config *config,
enum regmap_endian_type type,
enum regmap_endian *endian)
static enum regmap_endian regmap_get_reg_endian(const struct regmap_bus *bus,
const struct regmap_config *config)
{
struct device_node *np = dev->of_node;
if (!endian || !config)
return -EINVAL;
enum regmap_endian endian;
/* Retrieve the endianness specification from the regmap config */
switch (type) {
case REGMAP_ENDIAN_REG:
*endian = config->reg_format_endian;
break;
case REGMAP_ENDIAN_VAL:
*endian = config->val_format_endian;
break;
default:
return -EINVAL;
}
endian = config->reg_format_endian;
/* If the regmap config specified a non-default value, use that */
if (*endian != REGMAP_ENDIAN_DEFAULT)
return 0;
/* Parse the device's DT node for an endianness specification */
switch (type) {
case REGMAP_ENDIAN_VAL:
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;
break;
case REGMAP_ENDIAN_REG:
break;
default:
return -EINVAL;
}
/* If the endianness was specified in DT, use that */
if (*endian != REGMAP_ENDIAN_DEFAULT)
return 0;
if (endian != REGMAP_ENDIAN_DEFAULT)
return endian;
/* Retrieve the endianness specification from the bus config */
switch (type) {
case REGMAP_ENDIAN_REG:
if (bus && bus->reg_format_endian_default)
*endian = bus->reg_format_endian_default;
break;
case REGMAP_ENDIAN_VAL:
if (bus && bus->val_format_endian_default)
*endian = bus->val_format_endian_default;
break;
default:
return -EINVAL;
}
if (bus && bus->reg_format_endian_default)
endian = bus->reg_format_endian_default;
/* If the bus specified a non-default value, use that */
if (*endian != REGMAP_ENDIAN_DEFAULT)
return 0;
if (endian != REGMAP_ENDIAN_DEFAULT)
return endian;
/* Use this if no other value was found */
*endian = REGMAP_ENDIAN_BIG;
return REGMAP_ENDIAN_BIG;
}
return 0;
static enum regmap_endian regmap_get_val_endian(struct device *dev,
const struct regmap_bus *bus,
const struct regmap_config *config)
{
struct device_node *np = dev->of_node;
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;
/* 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;
/* 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;
}
/**
@ -626,15 +612,8 @@ struct regmap *regmap_init(struct device *dev,
map->reg_read = _regmap_bus_read;
}
ret = regmap_get_endian(dev, bus, config, REGMAP_ENDIAN_REG,
&reg_endian);
if (ret)
return ERR_PTR(ret);
ret = regmap_get_endian(dev, bus, config, REGMAP_ENDIAN_VAL,
&val_endian);
if (ret)
return ERR_PTR(ret);
reg_endian = regmap_get_reg_endian(bus, config);
val_endian = regmap_get_val_endian(dev, bus, config);
switch (config->reg_bits + map->reg_shift) {
case 2: