This is a note to let you know that I've just added the patch titled
regmap: allow to define reg_update_bits for no bus configuration
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
regmap-allow-to-define-reg_update_bits-for-no-bus-co.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit ee7b09e81c31d12393c05bbca1614c40c55ffba7
Author: Christian Marangi <ansuelsmth@xxxxxxxxx>
Date: Thu Nov 4 16:00:40 2021 +0100
regmap: allow to define reg_update_bits for no bus configuration
[ Upstream commit 02d6fdecb9c38de19065f6bed8d5214556fd061d ]
Some device requires a special handling for reg_update_bits and can't use
the normal regmap read write logic. An example is when locking is
handled by the device and rmw operations requires to do atomic operations.
Allow to declare a dedicated function in regmap_config for
reg_update_bits in no bus configuration.
Signed-off-by: Ansuel Smith <ansuelsmth@xxxxxxxxx>
Link: https://lore.kernel.org/r/20211104150040.1260-1-ansuelsmth@xxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Stable-dep-of: 3f42b142ea11 ("serial: max310x: fix IO data corruption in batched operations")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 7621b54975b57..ab924127e0aef 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -877,6 +877,7 @@ struct regmap *__regmap_init(struct device *dev,
if (!bus) {
map->reg_read = config->reg_read;
map->reg_write = config->reg_write;
+ map->reg_update_bits = config->reg_update_bits;
map->defer_caching = false;
goto skip_format_initialization;
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index e3c9a25a853a8..22652e5fbc380 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -290,6 +290,11 @@ typedef void (*regmap_unlock)(void *);
* read operation on a bus such as SPI, I2C, etc. Most of the
* devices do not need this.
* @reg_write: Same as above for writing.
+ * @reg_update_bits: Optional callback that if filled will be used to perform
+ * all the update_bits(rmw) operation. Should only be provided
+ * if the function require special handling with lock and reg
+ * handling and the operation cannot be represented as a simple
+ * update_bits operation on a bus such as SPI, I2C, etc.
* @fast_io: Register IO is fast. Use a spinlock instead of a mutex
* to perform locking. This field is ignored if custom lock/unlock
* functions are used (see fields lock/unlock of struct regmap_config).
@@ -372,6 +377,8 @@ struct regmap_config {
int (*reg_read)(void *context, unsigned int reg, unsigned int *val);
int (*reg_write)(void *context, unsigned int reg, unsigned int val);
+ int (*reg_update_bits)(void *context, unsigned int reg,
+ unsigned int mask, unsigned int val);
bool fast_io;
