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regmap: Add hook for printk logging for debugging during early init 

Sometimes for failures during very early init the trace infrastructure
isn't available early enough to be used.  For this sort of problem
defining LOG_DEVICE will add printks for basic register I/O on a specific
device, allowing trace to be extracted when the trace system doesn't come
up early enough to work with.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2012-07-06 14:10:23 +01:00
parent e8790ab4ce
commit 1044c180de
1 changed files with 23 additions and 0 deletions
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23
drivers/base/regmap/regmap.c
View File

@ -21,6 +21,18 @@
#include "internal.h"
/*
* Sometimes for failures during very early init the trace
* infrastructure isn't available early enough to be used. For this
* sort of problem defining LOG_DEVICE will add printks for basic
* register I/O on a specific device.
*/
#undef LOG_DEVICE
static int _regmap_update_bits(struct regmap *map, unsigned int reg,
unsigned int mask, unsigned int val,
bool *change);
bool regmap_writeable(struct regmap *map, unsigned int reg)
{
if (map->max_register && reg > map->max_register)
@ -700,6 +712,11 @@ int _regmap_write(struct regmap *map, unsigned int reg,
}
}
#ifdef LOG_DEVICE
if (strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
dev_info(map->dev, "%x <= %x\n", reg, val);
#endif
trace_regmap_reg_write(map->dev, reg, val);
if (map->format.format_write) {
@ -903,6 +920,12 @@ static int _regmap_read(struct regmap *map, unsigned int reg,
ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes);
if (ret == 0) {
*val = map->format.parse_val(map->work_buf);
#ifdef LOG_DEVICE
if (strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
dev_info(map->dev, "%x => %x\n", reg, *val);
#endif
trace_regmap_reg_read(map->dev, reg, *val);
}