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path: root/drivers/base/regmap/regmap.c
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Diffstat (limited to 'drivers/base/regmap/regmap.c')
-rw-r--r--drivers/base/regmap/regmap.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 58f84c3a6fc..e3ee9cabccb 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -374,6 +374,9 @@ int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config)
regmap_debugfs_init(map);
+ map->cache_bypass = false;
+ map->cache_only = false;
+
ret = regcache_init(map, config);
mutex_unlock(&map->lock);
@@ -783,6 +786,64 @@ int regmap_update_bits_check(struct regmap *map, unsigned int reg,
}
EXPORT_SYMBOL_GPL(regmap_update_bits_check);
+/**
+ * regmap_register_patch: Register and apply register updates to be applied
+ * on device initialistion
+ *
+ * @map: Register map to apply updates to.
+ * @regs: Values to update.
+ * @num_regs: Number of entries in regs.
+ *
+ * Register a set of register updates to be applied to the device
+ * whenever the device registers are synchronised with the cache and
+ * apply them immediately. Typically this is used to apply
+ * corrections to be applied to the device defaults on startup, such
+ * as the updates some vendors provide to undocumented registers.
+ */
+int regmap_register_patch(struct regmap *map, const struct reg_default *regs,
+ int num_regs)
+{
+ int i, ret;
+ bool bypass;
+
+ /* If needed the implementation can be extended to support this */
+ if (map->patch)
+ return -EBUSY;
+
+ mutex_lock(&map->lock);
+
+ bypass = map->cache_bypass;
+
+ map->cache_bypass = true;
+
+ /* Write out first; it's useful to apply even if we fail later. */
+ for (i = 0; i < num_regs; i++) {
+ ret = _regmap_write(map, regs[i].reg, regs[i].def);
+ if (ret != 0) {
+ dev_err(map->dev, "Failed to write %x = %x: %d\n",
+ regs[i].reg, regs[i].def, ret);
+ goto out;
+ }
+ }
+
+ map->patch = kcalloc(num_regs, sizeof(struct reg_default), GFP_KERNEL);
+ if (map->patch != NULL) {
+ memcpy(map->patch, regs,
+ num_regs * sizeof(struct reg_default));
+ map->patch_regs = num_regs;
+ } else {
+ ret = -ENOMEM;
+ }
+
+out:
+ map->cache_bypass = bypass;
+
+ mutex_unlock(&map->lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_register_patch);
+
static int __init regmap_initcall(void)
{
regmap_debugfs_initcall();