xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

regmap: allow busses to request formatting with specific endianness

Browse Source 
Add a field to struct regmap_bus that allows bus drivers to request that
register addresses and values be formatted with a specific endianness.

The default endianness is unchanged from current operation: Big.

Implement native endian formatting/parsing for 16- and 32-bit values.
This will be enough to support regmap-mmio.c.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Stephen Warren
2012-05-24 10:47:26 -06:00
committed by Mark Brown
parent f8f5701bda
commit 141eba2e00
2 changed files with 115 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
include/linux/regmap.h
View File

@@ -43,6 +43,14 @@ struct reg_default {
#ifdef CONFIG_REGMAP
enum regmap_endian {
/* Unspecified -> 0 -> Backwards compatible default */
REGMAP_ENDIAN_DEFAULT = 0,
REGMAP_ENDIAN_BIG,
REGMAP_ENDIAN_LITTLE,
REGMAP_ENDIAN_NATIVE,
};
/**
* Configuration for the register map of a device.
*
@@ -84,6 +92,12 @@ struct reg_default {
* @reg_defaults_raw: Power on reset values for registers (for use with
* register cache support).
* @num_reg_defaults_raw: Number of elements in reg_defaults_raw.
* @reg_format_endian: Endianness for formatted register addresses. If this is
* DEFAULT, the @reg_format_endian_default value from the
* regmap bus is used.
* @val_format_endian: Endianness for formatted register values. If this is
* DEFAULT, the @reg_format_endian_default value from the
* regmap bus is used.
*/
struct regmap_config {
const char *name;
@@ -109,6 +123,9 @@ struct regmap_config {
u8 write_flag_mask;
bool use_single_rw;
enum regmap_endian reg_format_endian;
enum regmap_endian val_format_endian;
};
typedef int (*regmap_hw_write)(void *context, const void *data,
@@ -133,6 +150,12 @@ typedef void (*regmap_hw_free_context)(void *context);
* data.
* @read_flag_mask: Mask to be set in the top byte of the register when doing
* a read.
* @reg_format_endian_default: Default endianness for formatted register
* addresses. Used when the regmap_config specifies DEFAULT. If this is
* DEFAULT, BIG is assumed.
* @val_format_endian_default: Default endianness for formatted register
* values. Used when the regmap_config specifies DEFAULT. If this is
* DEFAULT, BIG is assumed.
*/
struct regmap_bus {
bool fast_io;
@@ -141,6 +164,8 @@ struct regmap_bus {
regmap_hw_read read;
regmap_hw_free_context free_context;
u8 read_flag_mask;
enum regmap_endian reg_format_endian_default;
enum regmap_endian val_format_endian_default;
};
struct regmap *regmap_init(struct device *dev,