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Subject[PATCH v2 1/2] regmap: Add a function to check if a regmap register is cached
Date
Add a function to check if a regmap register is cached. This will be used
in debugfs to dump the cached values of write only registers.

Signed-off-by: Cristian Birsan <cristian.birsan@microchip.com>
---
drivers/base/regmap/internal.h | 1 +
drivers/base/regmap/regmap.c | 23 +++++++++++++++++++++++
2 files changed, 24 insertions(+)

diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h
index a038033..f4be4c1 100644
--- a/drivers/base/regmap/internal.h
+++ b/drivers/base/regmap/internal.h
@@ -173,6 +173,7 @@ struct regcache_ops {
int (*drop)(struct regmap *map, unsigned int min, unsigned int max);
};

+bool regmap_cached(struct regmap *map, unsigned int reg);
bool regmap_writeable(struct regmap *map, unsigned int reg);
bool regmap_readable(struct regmap *map, unsigned int reg);
bool regmap_volatile(struct regmap *map, unsigned int reg);
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 51fa7d6..1f011f9 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -93,6 +93,29 @@ bool regmap_writeable(struct regmap *map, unsigned int reg)
return true;
}

+bool regmap_cached(struct regmap *map, unsigned int reg)
+{
+ int ret;
+ unsigned int val;
+
+ if (map->cache == REGCACHE_NONE)
+ return false;
+
+ if (!map->cache_ops)
+ return false;
+
+ if (map->max_register && reg > map->max_register)
+ return false;
+
+ map->lock(map->lock_arg);
+ ret = regcache_read(map, reg, &val);
+ map->unlock(map->lock_arg);
+ if (ret)
+ return false;
+
+ return true;
+}
+
bool regmap_readable(struct regmap *map, unsigned int reg)
{
if (!map->reg_read)
--
1.9.1
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