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Message-Id: <1409150163-25729-1-git-send-email-geert+renesas@glider.be>
Date: Wed, 27 Aug 2014 16:36:03 +0200
From: Geert Uytterhoeven <geert+renesas@...der.be>
To: Mark Brown <broonie@...nel.org>
Cc: Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
Stephen Warren <swarren@...dia.com>,
Xiubo Li <Li.Xiubo@...escale.com>,
linux-kernel@...r.kernel.org,
Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH RFC] 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@...der.be>
---
This allows to drop "regmap: Make sure regmap_init() returns non-NULL on
failure" (unless you want to keep it for philosophical reasons).
This patch is against today's regmap/for-next.
drivers/base/regmap/regmap.c | 107 +++++++++++++++++--------------------------
1 file changed, 43 insertions(+), 64 deletions(-)
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 44c2df8284d7..f2281af24ec6 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -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 enum regmap_endian regmap_get_reg_endian(const struct regmap_bus *bus,
+ const struct regmap_config *config)
+{
+ enum regmap_endian endian;
-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)
+ /* Retrieve the endianness specification from the regmap config */
+ endian = config->reg_format_endian;
+
+ /* If the regmap config specified a non-default value, use that */
+ if (endian != REGMAP_ENDIAN_DEFAULT)
+ return endian;
+
+ /* Retrieve the endianness specification from the bus config */
+ 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 endian;
+
+ /* Use this if no other value was found */
+ return REGMAP_ENDIAN_BIG;
+}
+
+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;
-
- 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->val_format_endian;
/* If the regmap config specified a non-default value, use that */
- if (*endian != REGMAP_ENDIAN_DEFAULT)
- return 0;
+ if (endian != REGMAP_ENDIAN_DEFAULT)
+ return endian;
/* 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 (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 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->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 0;
+ if (endian != REGMAP_ENDIAN_DEFAULT)
+ return endian;
/* Use this if no other value was found */
- *endian = REGMAP_ENDIAN_BIG;
-
- return 0;
+ 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,
- ®_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:
--
1.9.1
--
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