1 files changed, 72 insertions, 7 deletions

diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 60a65cd7e1a0..3daac2d8dc37 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -20,9 +20,77 @@
 struct i2c_client;
 struct spi_device;
 
+/* An enum of all the supported cache types */
+enum regcache_type {
+        REGCACHE_NONE,
+        REGCACHE_INDEXED,
+        REGCACHE_RBTREE,
+        REGCACHE_LZO
+};
+
+/**
+ * Default value for a register.  We use an array of structs rather
+ * than a simple array as many modern devices have very sparse
+ * register maps.
+ *
+ * @reg: Register address.
+ * @def: Register default value.
+ */
+struct reg_default {
+        unsigned int reg;
+        unsigned int def;
+};
+
+/**
+ * Configuration for the register map of a device.
+ *
+ * @reg_bits: Number of bits in a register address, mandatory.
+ * @val_bits: Number of bits in a register value, mandatory.
+ *
+ * @writeable_reg: Optional callback returning true if the register
+ *                 can be written to.
+ * @readable_reg: Optional callback returning true if the register
+ *                can be read from.
+ * @volatile_reg: Optional callback returning true if the register
+ *                value can't be cached.
+ * @precious_reg: Optional callback returning true if the rgister
+ *                should not be read outside of a call from the driver
+ *                (eg, a clear on read interrupt status register).
+ *
+ * @max_register: Optional, specifies the maximum valid register index.
+ * @reg_defaults: Power on reset values for registers (for use with
+ *                register cache support).
+ * @num_reg_defaults: Number of elements in reg_defaults.
+ *
+ * @read_flag_mask: Mask to be set in the top byte of the register when doing
+ *                  a read.
+ * @write_flag_mask: Mask to be set in the top byte of the register when doing
+ *                   a write. If both read_flag_mask and write_flag_mask are
+ *                   empty the regmap_bus default masks are used.
+ *
+ * @cache_type: The actual cache type.
+ * @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.
+ */
 struct regmap_config {
         int reg_bits;
         int val_bits;
+
+        bool (*writeable_reg)(struct device *dev, unsigned int reg);
+        bool (*readable_reg)(struct device *dev, unsigned int reg);
+        bool (*volatile_reg)(struct device *dev, unsigned int reg);
+        bool (*precious_reg)(struct device *dev, unsigned int reg);
+
+        unsigned int max_register;
+        struct reg_default *reg_defaults;
+        unsigned int num_reg_defaults;
+        enum regcache_type cache_type;
+        const void *reg_defaults_raw;
+        unsigned int num_reg_defaults_raw;
+
+        u8 read_flag_mask;
+        u8 write_flag_mask;
 };
 
 typedef int (*regmap_hw_write)(struct device *dev, const void *data,
@@ -37,25 +105,18 @@ typedef int (*regmap_hw_read)(struct device *dev,
 /**
  * Description of a hardware bus for the register map infrastructure.
  *
- * @list: Internal use.
- * @type: Bus type, used to identify bus to be used for a device.
  * @write: Write operation.
  * @gather_write: Write operation with split register/value, return -ENOTSUPP
  *                if not implemented  on a given device.
  * @read: Read operation.  Data is returned in the buffer used to transmit
  *         data.
- * @owner: Module with the bus implementation, used to pin the implementation
- *         in memory.
  * @read_flag_mask: Mask to be set in the top byte of the register when doing
  *                  a read.
  */
 struct regmap_bus {
-        struct list_head list;
-        struct bus_type *type;
         regmap_hw_write write;
         regmap_hw_gather_write gather_write;
         regmap_hw_read read;
-        struct module *owner;
         u8 read_flag_mask;
 };
 
@@ -79,4 +140,8 @@ int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
 int regmap_update_bits(struct regmap *map, unsigned int reg,
                        unsigned int mask, unsigned int val);
 
+int regcache_sync(struct regmap *map);
+void regcache_cache_only(struct regmap *map, bool enable);
+void regcache_cache_bypass(struct regmap *map, bool enable);
+
 #endif