return regmap_spi_gather_write(context, reg, 4, val, count - 4);
 }
 
-static int regmap_spi_async_write(void *context,
-                                 const void *reg, size_t reg_len,
-                                 const void *val, size_t val_len,
-                                 struct regmap_async *a)
-{
-       return -ENOTSUPP;
-}
-
-static struct regmap_async *regmap_spi_async_alloc(void)
-{
-       return NULL;
-}
-
 static int tcan4x5x_regmap_read(void *context,
                                const void *reg, size_t reg_size,
                                void *val, size_t val_size)
 static const struct regmap_bus tcan4x5x_bus = {
        .write = tcan4x5x_regmap_write,
        .gather_write = regmap_spi_gather_write,
-       .async_write = regmap_spi_async_write,
-       .async_alloc = regmap_spi_async_alloc,
        .read = tcan4x5x_regmap_read,
        .reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
        .val_format_endian_default = REGMAP_ENDIAN_NATIVE,