regmap: Allow specifying read/write width
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 <p.yadav@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/include/regmap.h b/include/regmap.h
index c7dd240..19474e6 100644
--- a/include/regmap.h
+++ b/include/regmap.h
@@ -76,16 +76,28 @@
};
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];
};
@@ -96,32 +108,24 @@
*/
/**
- * 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.
- *
* 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.
- *
* Return: 0 if OK, -ve on error
*/
int regmap_read(struct regmap *map, uint offset, uint *valp);
@@ -135,8 +139,9 @@
* @val_len: Length of the data to be written to the regmap
*
* Note that this function will, as opposed to regmap_write, write data of
- * arbitrary length to the regmap, and not just 32-bit values, and is thus a
- * generalized version of regmap_write.
+ * arbitrary length to the regmap, and not just the size configured in the
+ * regmap (defaults to 32-bit) and is thus a generalized version of
+ * regmap_write.
*
* Return: 0 if OK, -ve on error
*/
@@ -153,8 +158,9 @@
* @val_len: Length of the data to be read from the regmap
*
* Note that this function will, as opposed to regmap_read, read data of
- * arbitrary length from the regmap, and not just 32-bit values, and is thus a
- * generalized version of regmap_read.
+ * arbitrary length from the regmap, and not just the size configured in the
+ * regmap (defaults to 32-bit) and is thus a generalized version of
+ * regmap_read.
*
* Return: 0 if OK, -ve on error
*/
@@ -344,7 +350,7 @@
* @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