regmap: Add endianness support

Add support for switching the endianness of regmap accesses via the
"little-endian", "big-endian", and "native-endian" boolean properties in
the device tree.

The default endianness is native endianness.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/include/regmap.h b/include/regmap.h
index 3b7eea5f49..98860c2732 100644
--- a/include/regmap.h
+++ b/include/regmap.h
@@ -23,6 +23,19 @@ enum regmap_size_t {
 };
 
 /**
+ * enum regmap_endianness_t - Endianness for regmap reads and writes
+ *
+ * @REGMAP_NATIVE_ENDIAN: Native endian read/write accesses
+ * @REGMAP_LITTLE_ENDIAN: Little endian read/write accesses
+ * @REGMAP_BIG_ENDIAN: Big endian read/write accesses
+ */
+enum regmap_endianness_t {
+	REGMAP_NATIVE_ENDIAN,
+	REGMAP_LITTLE_ENDIAN,
+	REGMAP_BIG_ENDIAN,
+};
+
+/**
  * struct regmap_range - a register map range
  *
  * @start:	Start address
@@ -40,6 +53,7 @@ struct regmap_range {
  * @ranges:		Array of ranges
  */
 struct regmap {
+	enum regmap_endianness_t endianness;
 	int range_count;
 	struct regmap_range ranges[0];
 };