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Subject[PATCH 2/4] regmap: Add bypassed version of regmap_multi_reg_write
Date
Devices with more complex boot proceedures may occasionally apply the
register patch manual. regmap_multi_reg_write is a logical way to do so,
however the patch must be applied with cache bypass on, such that it
doesn't override any user settings. This patch adds a
regmap_multi_reg_write_bypassed function that applies a set of writes
with the bypass enabled.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
---
drivers/base/regmap/regmap.c | 75 ++++++++++++++++++++++++++++++++++-------
include/linux/regmap.h | 3 ++
2 files changed, 65 insertions(+), 13 deletions(-)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 1ebc6df..6b07a97 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1591,6 +1591,26 @@ out:
}
EXPORT_SYMBOL_GPL(regmap_bulk_write);

+static int _regmap_multi_reg_write(struct regmap *map,
+ const struct reg_default *regs,
+ int num_regs)
+{
+ int i, ret;
+
+ for (i = 0; i < num_regs; i++) {
+ if (regs[i].reg % map->reg_stride)
+ return -EINVAL;
+ ret = _regmap_write(map, regs[i].reg, regs[i].def);
+ if (ret != 0) {
+ dev_err(map->dev, "Failed to write %x = %x: %d\n",
+ regs[i].reg, regs[i].def, ret);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
/*
* regmap_multi_reg_write(): Write multiple registers to the device
*
@@ -1610,28 +1630,57 @@ EXPORT_SYMBOL_GPL(regmap_bulk_write);
int regmap_multi_reg_write(struct regmap *map, const struct reg_default *regs,
int num_regs)
{
- int ret = 0, i;
-
- for (i = 0; i < num_regs; i++) {
- int reg = regs[i].reg;
- if (reg % map->reg_stride)
- return -EINVAL;
- }
+ int ret;

map->lock(map->lock_arg);

- for (i = 0; i < num_regs; i++) {
- ret = _regmap_write(map, regs[i].reg, regs[i].def);
- if (ret != 0)
- goto out;
- }
-out:
+ ret = _regmap_multi_reg_write(map, regs, num_regs);
+
map->unlock(map->lock_arg);

return ret;
}
EXPORT_SYMBOL_GPL(regmap_multi_reg_write);

+/*
+ * regmap_multi_reg_write_bypassed(): Write multiple registers to the
+ * device but not the cache
+ *
+ * where the set of register are supplied in any order
+ *
+ * @map: Register map to write to
+ * @regs: Array of structures containing register,value to be written
+ * @num_regs: Number of registers to write
+ *
+ * This function is intended to be used for writing a large block of data
+ * atomically to the device in single transfer for those I2C client devices
+ * that implement this alternative block write mode.
+ *
+ * A value of zero will be returned on success, a negative errno will
+ * be returned in error cases.
+ */
+int regmap_multi_reg_write_bypassed(struct regmap *map,
+ const struct reg_default *regs,
+ int num_regs)
+{
+ int ret;
+ bool bypass;
+
+ map->lock(map->lock_arg);
+
+ bypass = map->cache_bypass;
+ map->cache_bypass = true;
+
+ ret = _regmap_multi_reg_write(map, regs, num_regs);
+
+ map->cache_bypass = bypass;
+
+ map->unlock(map->lock_arg);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_multi_reg_write_bypassed);
+
/**
* regmap_raw_write_async(): Write raw values to one or more registers
* asynchronously
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index ccb2ed0..15a6c2c 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -390,6 +390,9 @@ int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
size_t val_count);
int regmap_multi_reg_write(struct regmap *map, const struct reg_default *regs,
int num_regs);
+int regmap_multi_reg_write_bypassed(struct regmap *map,
+ const struct reg_default *regs,
+ int num_regs);
int regmap_raw_write_async(struct regmap *map, unsigned int reg,
const void *val, size_t val_len);
int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val);
--
1.7.2.5


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