regmap: Introduce max_raw_read/write for regmap_bulk_read/write

There are some buses which have a limit on the maximum number of bytes
that can be send/received. An example for this is
I2C_FUNC_SMBUS_I2C_BLOCK which does not support any reads/writes of more
than 32 bytes. The regmap_bulk operations should still be able to
utilize the full 32 bytes in this case.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 73fc34d0c4c2..327b8f291d3f 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -311,6 +311,8 @@ typedef void (*regmap_hw_free_context)(void *context);
  * @val_format_endian_default: Default endianness for formatted register
  *     values. Used when the regmap_config specifies DEFAULT. If this is
  *     DEFAULT, BIG is assumed.
+ * @max_raw_read: Max raw read size that can be used on the bus.
+ * @max_raw_write: Max raw write size that can be used on the bus.
  */
 struct regmap_bus {
         bool fast_io;
@@ -325,6 +327,8 @@ struct regmap_bus {
         u8 read_flag_mask;
         enum regmap_endian reg_format_endian_default;
         enum regmap_endian val_format_endian_default;
+        size_t max_raw_read;
+        size_t max_raw_write;
 };
 
 struct regmap *regmap_init(struct device *dev,