Merge tag 'regmap-v4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap

Pull regmap updates from Mark Brown:
 "A very busy release for regmap, all fairly specialist stuff but
  useful:

   - Support for disabling locking from Bartosz Golaszewski, allowing
     users that handle their own locking to save some overhead.

   - Support for hwspinlocks in syscons in MFD from Baolin Wang, this is
     going through the regmap tree since the first users turned up some
     some cases that needed interface tweaks with 0 being used as a
     syscon identifier.

   - Support for devices with no read or write flag from Andrew F.
     Davis.

   - Basic support for devices on SoundWire buses from Vinod Koul"

* tag 'regmap-v4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
  mfd: syscon: Add hardware spinlock support
  regmap: Allow empty read/write_flag_mask
  regcache: flat: Un-inline index lookup from cache access
  regmap: Add SoundWire bus support
  regmap: Add one flag to indicate if a hwlock should be used
  regmap: debugfs: document why we don't create the debugfs entries
  regmap: debugfs: emit a debug message when locking is disabled
  regmap: use proper part of work_buf for storing val
  regmap: potentially duplicate the name string stored in regmap
  regmap: Disable debugfs when locking is disabled
  regmap: rename regmap_lock_unlock_empty() to regmap_lock_unlock_none()
  regmap: allow to disable all locking mechanisms
  regmap: Remove the redundant config to select hwspinlock

1 files changed, 49 insertions, 1 deletions

diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 15eddc1353ba..20268b7d5001 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -30,6 +30,7 @@ struct regmap;
 struct regmap_range_cfg;
 struct regmap_field;
 struct snd_ac97;
+struct sdw_slave;
 
 /* An enum of all the supported cache types */
 enum regcache_type {
@@ -264,6 +265,9 @@ typedef void (*regmap_unlock)(void *);
  *                field is NULL but precious_table (see below) is not, the
  *                check is performed on such table (a register is precious if
  *                it belongs to one of the ranges specified by precious_table).
+ * @disable_locking: This regmap is either protected by external means or
+ *                   is guaranteed not be be accessed from multiple threads.
+ *                   Don't use any locking mechanisms.
  * @lock:         Optional lock callback (overrides regmap's default lock
  *                function, based on spinlock or mutex).
  * @unlock:       As above for unlocking.
@@ -296,7 +300,10 @@ typedef void (*regmap_unlock)(void *);
  *                  a read.
  * @write_flag_mask: Mask to be set in the top bytes 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.
+ *                   empty and zero_flag_mask is not set the regmap_bus default
+ *                   masks are used.
+ * @zero_flag_mask: If set, read_flag_mask and write_flag_mask are used even
+ *                   if they are both empty.
  * @use_single_rw: If set, converts the bulk read and write operations into
  *                  a series of single read and write operations. This is useful
  *                  for device that does not support bulk read and write.
@@ -317,6 +324,7 @@ typedef void (*regmap_unlock)(void *);
  *
  * @ranges: Array of configuration entries for virtual address ranges.
  * @num_ranges: Number of range configuration entries.
+ * @use_hwlock: Indicate if a hardware spinlock should be used.
  * @hwlock_id: Specify the hardware spinlock id.
  * @hwlock_mode: The hardware spinlock mode, should be HWLOCK_IRQSTATE,
  *               HWLOCK_IRQ or 0.
@@ -333,6 +341,8 @@ struct regmap_config {
         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);
+
+        bool disable_locking;
         regmap_lock lock;
         regmap_unlock unlock;
         void *lock_arg;
@@ -355,6 +365,7 @@ struct regmap_config {
 
         unsigned long read_flag_mask;
         unsigned long write_flag_mask;
+        bool zero_flag_mask;
 
         bool use_single_rw;
         bool can_multi_write;
@@ -365,6 +376,7 @@ struct regmap_config {
         const struct regmap_range_cfg *ranges;
         unsigned int num_ranges;
 
+        bool use_hwlock;
         unsigned int hwlock_id;
         unsigned int hwlock_mode;
 };
@@ -524,6 +536,10 @@ struct regmap *__regmap_init_ac97(struct snd_ac97 *ac97,
                                   const struct regmap_config *config,
                                   struct lock_class_key *lock_key,
                                   const char *lock_name);
+struct regmap *__regmap_init_sdw(struct sdw_slave *sdw,
+                                 const struct regmap_config *config,
+                                 struct lock_class_key *lock_key,
+                                 const char *lock_name);
 
 struct regmap *__devm_regmap_init(struct device *dev,
                                   const struct regmap_bus *bus,
@@ -561,6 +577,10 @@ struct regmap *__devm_regmap_init_ac97(struct snd_ac97 *ac97,
                                        const struct regmap_config *config,
                                        struct lock_class_key *lock_key,
                                        const char *lock_name);
+struct regmap *__devm_regmap_init_sdw(struct sdw_slave *sdw,
+                                 const struct regmap_config *config,
+                                 struct lock_class_key *lock_key,
+                                 const char *lock_name);
 
 /*
  * Wrapper for regmap_init macros to include a unique lockdep key and name
@@ -710,6 +730,20 @@ int regmap_attach_dev(struct device *dev, struct regmap *map,
 bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg);
 
 /**
+ * regmap_init_sdw() - Initialise register map
+ *
+ * @sdw: Device that will be interacted with
+ * @config: Configuration for register map
+ *
+ * The return value will be an ERR_PTR() on error or a valid pointer to
+ * a struct regmap.
+ */
+#define regmap_init_sdw(sdw, config)                                    \
+        __regmap_lockdep_wrapper(__regmap_init_sdw, #config,            \
+                                sdw, config)
+
+
+/**
  * devm_regmap_init() - Initialise managed register map
  *
  * @dev: Device that will be interacted with
@@ -839,6 +873,20 @@ bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg);
         __regmap_lockdep_wrapper(__devm_regmap_init_ac97, #config,      \
                                 ac97, config)
 
+/**
+ * devm_regmap_init_sdw() - Initialise managed register map
+ *
+ * @sdw: Device that will be interacted with
+ * @config: Configuration for register map
+ *
+ * The return value will be an ERR_PTR() on error or a valid pointer
+ * to a struct regmap. The regmap will be automatically freed by the
+ * device management code.
+ */
+#define devm_regmap_init_sdw(sdw, config)                               \
+        __regmap_lockdep_wrapper(__devm_regmap_init_sdw, #config,       \
+                                sdw, config)
+
 void regmap_exit(struct regmap *map);
 int regmap_reinit_cache(struct regmap *map,
                         const struct regmap_config *config);