This patch series is mostly Freescale's SAI SoC Digital Audio Interface

driver implementation. And the implementation is only compatible with

device tree definition.

This patch series is based on linux-next and has been tested on Vybrid

VF610 Tower board using device tree.

Changed in v4:

- Remove the uneeded function fsl_sai_dai_remove().

- Use snd_soc_dai_init_dma_data().

- Adjust the Konfig file.

Changed in v3:

- Add big-endian mode support.

- Revise some commit comments, coding styles,etc.

- Keep header files ordered by alphabet,etc.

- Add MODULE_ALIAS("platform:fsl-sai") for SAI driver.

- Rename the files to be in a same pattern with the existed ones.

- Remove some not useful functions or code.

- Only enable the clock while the device is in active use.

- Revise one error message according to Bill.

Changed in v2:

- Use default settings for the generic dmaengine PCM driver.

- Separate receive and transmit setting in most functions, but some couldn't for the HW limitation.

- Drop some not reduntant code.

- Use devm_snd_soc_register_component() instead of snd_soc_register_component().

- Use devm_snd_soc_register_card() instead of devm_snd_soc_register_card().

- Adjust the code sentences sequence.

- Make the namespacing consistent.

- Rename CONFIG_SND_SOC_FSL_SGTL5000 to CONFIG_SND_SOC_FSL_SGTL5000_VF610.

- Drop some meaningless lines.

- Rename the binding document file.

Added in v1:

- Add SAI SoC Digital Audio Interface driver.

- Add Freescale SAI ALSA SoC Digital Audio Interface node for VF610.

- Enables SAI ALSA SoC DAI device for Vybrid VF610 TOWER board.

- Add device tree bindings for Freescale SAI.

- Revise the bugs about the sgt15000 codec.

- Add SGT15000 based audio machine driver.

- Enable SGT15000 codec based audio driver node for VF610.

- Add device tree bindings for Freescale VF610 sound.