[PATCH v2 0/2] i2c: add DMA support for freescale i2c driver

[Yuan Yao]

Changed in v2:
- remove has_dma_support property
- unify i2c_imx_dma_rx and i2c_imx_dma_tx
- unify i2c_imx_dma_read and i2c_imx_pio_read
- unify i2c_imx_dma_write and i2c_imx_pio_write

Added in v1:
- Enable dma if it's support dma and transfer size bigger than the threshold.
- Add device tree bindings for i2c eDMA support.
- Add eDMA support for i2c driver.


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