ENGR00276567-5 mfd: si476x: Add two involatile registers support

These two regsiters would be used by si476x-codec driver. Setting them as
involatile registers would allow codec driver to set the value into cache
and to sync them after power-up.

Signed-off-by: Nicolin Chen <b42378@freescale.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/drivers/mfd/si476x-prop.c b/drivers/mfd/si476x-prop.c
index cfeffa6e15d9..3ff2cae9cbab 100644
--- a/drivers/mfd/si476x-prop.c
+++ b/drivers/mfd/si476x-prop.c
@@ -217,15 +217,36 @@ static int si476x_core_regmap_read(void *context, unsigned int reg,
         return 0;
 }
 
+static bool si476x_core_regmap_volatile_register(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case SI476X_PROP_DIGITAL_IO_OUTPUT_SAMPLE_RATE:
+        case SI476X_PROP_DIGITAL_IO_OUTPUT_FORMAT:
+                return false;
+        default:
+                return true;
+        }
+
+        return true;
+}
+
+/* These two register is used by the codec, so add reg_default here */
+static struct reg_default si476x_core_reg[] = {
+        { 0x202, 0xBB80 },
+        { 0x203, 0x1700 },
+};
 
 static const struct regmap_config si476x_regmap_config = {
         .reg_bits = 16,
         .val_bits = 16,
 
         .max_register = 0x4003,
+        .reg_defaults = si476x_core_reg,
+        .num_reg_defaults = ARRAY_SIZE(si476x_core_reg),
 
         .writeable_reg = si476x_core_regmap_writable_register,
         .readable_reg = si476x_core_regmap_readable_register,
+        .volatile_reg = si476x_core_regmap_volatile_register,
 
         .reg_read = si476x_core_regmap_read,
         .reg_write = si476x_core_regmap_write,