Right now, regmap_read() and regmap_write() read/write a 32-bit value
only. To write other lengths, regmap_raw_read() and regmap_raw_write()
need to be used.
This means that any driver ported from Linux that relies on
regmap_{read,write}() to know the size already has to be updated at each
callsite. This makes the port harder to maintain.
So, allow specifying the read/write width to make it easier to port the
drivers, since now the only change needed is when initializing the
regmap.
Signed-off-by: Pratyush Yadav <[email protected]>
---
drivers/core/regmap.c | 12 +++++++++---
include/regmap.h | 28 ++++++++++++++++++----------
2 files changed, 27 insertions(+), 13 deletions(-)
diff --git a/drivers/core/regmap.c b/drivers/core/regmap.c
index 24651fb3ec..0180246095 100644
--- a/drivers/core/regmap.c
+++ b/drivers/core/regmap.c
@@ -245,7 +245,7 @@ struct regmap *devm_regmap_init(struct udevice *dev,
const struct regmap_config *config)
{
int rc;
- struct regmap **mapp;
+ struct regmap **mapp, *map;
mapp = devres_alloc(devm_regmap_release, sizeof(struct regmap *),
__GFP_ZERO);
@@ -256,6 +256,10 @@ struct regmap *devm_regmap_init(struct udevice *dev,
if (rc)
return ERR_PTR(rc);
+ map = *mapp;
+ if (config)
+ map->width = config->width;
+
devres_add(dev, mapp);
return *mapp;
}
@@ -378,7 +382,8 @@ int regmap_raw_read(struct regmap *map, uint offset, void
*valp, size_t val_len)
int regmap_read(struct regmap *map, uint offset, uint *valp)
{
- return regmap_raw_read(map, offset, valp, REGMAP_SIZE_32);
+ return regmap_raw_read(map, offset, valp,
+ map->width ? map->width : REGMAP_SIZE_32);
}
static inline void __write_8(u8 *addr, const u8 *val,
@@ -488,7 +493,8 @@ int regmap_raw_write(struct regmap *map, uint offset, const
void *val,
int regmap_write(struct regmap *map, uint offset, uint val)
{
- return regmap_raw_write(map, offset, &val, REGMAP_SIZE_32);
+ return regmap_raw_write(map, offset, &val,
+ map->width ? map->width : REGMAP_SIZE_32);
}
int regmap_update_bits(struct regmap *map, uint offset, uint mask, uint val)
diff --git a/include/regmap.h b/include/regmap.h
index c7dd240a74..9362d864c0 100644
--- a/include/regmap.h
+++ b/include/regmap.h
@@ -76,16 +76,28 @@ struct regmap_range {
};
struct regmap_bus;
-struct regmap_config;
+
+/**
+ * struct regmap_config - Configure the behaviour of a regmap
+ *
+ * @width: Width of the read/write operations. Defaults to
+ * REGMAP_SIZE_32 if set to 0.
+ */
+struct regmap_config {
+ enum regmap_size_t width;
+};
/**
* struct regmap - a way of accessing hardware/bus registers
*
+ * @width: Width of the read/write operations. Defaults to
+ * REGMAP_SIZE_32 if set to 0.
* @range_count: Number of ranges available within the map
* @ranges: Array of ranges
*/
struct regmap {
enum regmap_endianness_t endianness;
+ enum regmap_size_t width;
int range_count;
struct regmap_range ranges[0];
};
@@ -96,31 +108,27 @@ struct regmap {
*/
/**
- * regmap_write() - Write a 32-bit value to a regmap
+ * regmap_write() - Write a value to a regmap
*
* @map: Regmap to write to
* @offset: Offset in the regmap to write to
* @val: Data to write to the regmap at the specified offset
*
- * Note that this function will only write values of 32 bit width to the
- * regmap; if the size of data to be read is different, the regmap_raw_write
- * function can be used.
+ * If the map's width is not set, this function will write a 32-bit value.
*
* Return: 0 if OK, -ve on error
*/
int regmap_write(struct regmap *map, uint offset, uint val);
/**
- * regmap_read() - Read a 32-bit value from a regmap
+ * regmap_read() - Read a value from a regmap
*
* @map: Regmap to read from
* @offset: Offset in the regmap to read from
* @valp: Pointer to the buffer to receive the data read from the regmap
* at the specified offset
*
- * Note that this function will only read values of 32 bit width from the
- * regmap; if the size of data to be read is different, the regmap_raw_read
- * function can be used.
+ * If the map's width is not set, this function will read a 32-bit value.
*
* Return: 0 if OK, -ve on error
*/
@@ -344,7 +352,7 @@ int regmap_init_mem_index(ofnode node, struct regmap
**mapp, int index);
* @dev: Device that will be interacted with
* @bus: Bus-specific callbacks to use with device (IGNORED)
* @bus_context: Data passed to bus-specific callbacks (IGNORED)
- * @config: Configuration for register map (IGNORED)
+ * @config: Configuration for register map
*
* @Return a valid pointer to a struct regmap or a ERR_PTR() on error.
* The structure is automatically freed when the device is unbound
--
2.26.2
