This fixes:
975:9: sparse: Using plain integer as NULL pointer
1917:24: sparse: symbol 'rt5640_aif_dai_ops' was not declared. Should it be static?
1924:27: sparse: symbol 'rt5640_dai' was not declared. Should it be static?
2079:19: sparse: symbol 'rt5640_i2c_driver' was not declared. Should it be static?
Reported-by: NFengguang Wu <fengguang.wu@intel.com>
Signed-off-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NMark Brown <broonie@linaro.org>

Modify the RT5640 driver to parse platform data from device tree. Write
a DT binding document to describe those properties.

Slight re-ordering of rt5640_i2c_probe() to better fit the DT parsing.

Since ldo1_en is optional, guard usage of it with gpio_is_valid(), rather
than open-coding an if (gpio) check.
Signed-off-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NMark Brown <broonie@linaro.org>

This patch adds the ALC5640 codec driver.
Signed-off-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NBard Liao <bardliao@realtek.com>
Tested-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NMark Brown <broonie@linaro.org>