RE: [PATCH V9 3/5] i2c: tegra: Add DMA support

[Sowjanya Komatineni]

> I know that APB DMA driver enables flow control based on the channels spec, but still won't hurt to explicitly show that channels are flow-controlled. Ideally APB DMA driver should respect the device_fc field.
>
>		dma_sconfig.device_fc = true;


Dmitry,
Thanks for all feedback. Sent updated patch V10 which has all below V9 feedback changes.

- Added explicit flow control settings to dma slave config and error check so need to move releasing of dma resources to separate function as I am using it multiple places (when dma slave config failed, on tegra drive remove, tegra_i2c_init_dma).
As a part of this, moved error handling also inside init_dma as you suggested in earlier feedback.
- Added apbdma hw support flag to now allow Tegra186 and later use APBDMA driver.
- Updated to register tegra_i2c_driver from module level rather than subsys level.
- Fixed timeout for bus clear to 50ms (10ms is enough but considering slaves responding slow). Also added adapter timeout to 6s considering worst case transfer rate.
- other minor fixes.

Please review.
- Sowjanya